Merging upstream version 1.60.0.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

34 files changed, 4801 insertions, 4626 deletions

diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index b20ccf7..852cb10 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -1,55 +1,52 @@
 # XXX testdata/: EXTRA_DIST = cacert.pem  index.html  privkey.pem
-if(HAVE_CUNIT)
-  string(REPLACE " " ";" c_flags "${WARNCFLAGS}")
-  add_compile_options(${c_flags})
+string(REPLACE " " ";" c_flags "${WARNCFLAGS}")
+add_compile_options(${c_flags})
 
-  include_directories(
-    "${CMAKE_SOURCE_DIR}/lib/includes"
-    "${CMAKE_SOURCE_DIR}/lib"
-    "${CMAKE_BINARY_DIR}/lib/includes"
-    ${CUNIT_INCLUDE_DIRS}
-  )
+include_directories(
+  "${CMAKE_SOURCE_DIR}/lib/includes"
+  "${CMAKE_SOURCE_DIR}/lib"
+  "${CMAKE_SOURCE_DIR}/tests/munit"
+  "${CMAKE_BINARY_DIR}/lib/includes"
+)
+
+set(MAIN_SOURCES
+  main.c nghttp2_pq_test.c nghttp2_map_test.c nghttp2_queue_test.c
+  nghttp2_test_helper.c
+  nghttp2_frame_test.c
+  nghttp2_stream_test.c
+  nghttp2_session_test.c
+  nghttp2_hd_test.c
+  nghttp2_alpn_test.c
+  nghttp2_helper_test.c
+  nghttp2_buf_test.c
+  nghttp2_http_test.c
+  nghttp2_extpri_test.c
+  nghttp2_ratelim_test.c
+  munit/munit.c
+)
+
+add_executable(main EXCLUDE_FROM_ALL
+  ${MAIN_SOURCES}
+)
+target_link_libraries(main
+  nghttp2_static
+)
+add_test(main main)
+add_dependencies(check main)
 
-  set(MAIN_SOURCES
-    main.c nghttp2_pq_test.c nghttp2_map_test.c nghttp2_queue_test.c
+if(ENABLE_FAILMALLOC)
+  set(FAILMALLOC_SOURCES
+    failmalloc.c failmalloc_test.c
+    malloc_wrapper.c
     nghttp2_test_helper.c
-    nghttp2_frame_test.c
-    nghttp2_stream_test.c
-    nghttp2_session_test.c
-    nghttp2_hd_test.c
-    nghttp2_alpn_test.c
-    nghttp2_helper_test.c
-    nghttp2_buf_test.c
-    nghttp2_http_test.c
-    nghttp2_extpri_test.c
-    nghttp2_ratelim_test.c
+    munit/munit.c
   )
-
-  add_executable(main EXCLUDE_FROM_ALL
-    ${MAIN_SOURCES}
+  add_executable(failmalloc EXCLUDE_FROM_ALL
+    ${FAILMALLOC_SOURCES}
   )
-  target_include_directories(main PRIVATE ${CUNIT_INCLUDE_DIRS})
-  target_link_libraries(main
+  target_link_libraries(failmalloc
     nghttp2_static
-    ${CUNIT_LIBRARIES}
   )
-  add_test(main main)
-  add_dependencies(check main)
-
-  if(ENABLE_FAILMALLOC)
-    set(FAILMALLOC_SOURCES
-      failmalloc.c failmalloc_test.c
-      malloc_wrapper.c
-      nghttp2_test_helper.c
-    )
-    add_executable(failmalloc EXCLUDE_FROM_ALL
-      ${FAILMALLOC_SOURCES}
-    )
-    target_link_libraries(failmalloc
-      nghttp2_static
-      ${CUNIT_LIBRARIES}
-    )
-    add_test(failmalloc failmalloc)
-    add_dependencies(check failmalloc)
-  endif()
+  add_test(failmalloc failmalloc)
+  add_dependencies(check failmalloc)
 endif()
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 1c506d8..456f65f 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -22,9 +22,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 SUBDIRS = testdata
 
-EXTRA_DIST = CMakeLists.txt
-
-if HAVE_CUNIT
+EXTRA_DIST = CMakeLists.txt munit/COPYING
 
 check_PROGRAMS = main
 
@@ -43,17 +41,20 @@ OBJECTS = main.c nghttp2_pq_test.c nghttp2_map_test.c nghttp2_queue_test.c \
 	nghttp2_buf_test.c \
 	nghttp2_http_test.c \
 	nghttp2_extpri_test.c \
-	nghttp2_ratelim_test.c
+	nghttp2_ratelim_test.c \
+	munit/munit.c
 
 HFILES = nghttp2_pq_test.h nghttp2_map_test.h nghttp2_queue_test.h \
 	nghttp2_session_test.h \
 	nghttp2_frame_test.h nghttp2_stream_test.h nghttp2_hd_test.h \
 	nghttp2_alpn_test.h nghttp2_helper_test.h \
+	nghttp2_assertion.h \
 	nghttp2_test_helper.h \
 	nghttp2_buf_test.h \
 	nghttp2_http_test.h \
 	nghttp2_extpri_test.h \
-	nghttp2_ratelim_test.h
+	nghttp2_ratelim_test.h \
+	munit/munit.h
 
 main_SOURCES = $(HFILES) $(OBJECTS)
 
@@ -65,13 +66,14 @@ else
 main_LDADD = ${top_builddir}/lib/.libs/*.o
 endif
 
-main_LDADD += @CUNIT_LIBS@ @TESTLDADD@
+main_LDADD += @TESTLDADD@
 main_LDFLAGS = -static
 
 if ENABLE_FAILMALLOC
 failmalloc_SOURCES = failmalloc.c failmalloc_test.c failmalloc_test.h \
 	malloc_wrapper.c malloc_wrapper.h \
-	nghttp2_test_helper.c nghttp2_test_helper.h
+	nghttp2_test_helper.c nghttp2_test_helper.h \
+	munit/munit.c munit/munit.h
 failmalloc_LDADD = $(main_LDADD)
 failmalloc_LDFLAGS = $(main_LDFLAGS)
 endif # ENABLE_FAILMALLOC
@@ -79,15 +81,14 @@ endif # ENABLE_FAILMALLOC
 AM_CFLAGS = $(WARNCFLAGS) \
 	-I${top_srcdir}/lib \
 	-I${top_srcdir}/lib/includes \
+	-I${top_srcdir}/tests/munit \
 	-I${top_builddir}/lib/includes \
 	-DBUILDING_NGHTTP2 \
 	-DNGHTTP2_STATICLIB \
-	@CUNIT_CFLAGS@ @DEFS@
+	@DEFS@
 
 TESTS = main
 
 if ENABLE_FAILMALLOC
 TESTS += failmalloc
 endif # ENABLE_FAILMALLOC
-
-endif # HAVE_CUNIT
diff --git a/tests/failmalloc.c b/tests/failmalloc.c
index 6294cff..b491deb 100644
--- a/tests/failmalloc.c
+++ b/tests/failmalloc.c
@@ -26,54 +26,20 @@
 #  include <config.h>
 #endif /* HAVE_CONFIG_H */
 
-#include <stdio.h>
-#include <string.h>
-#include <CUnit/Basic.h>
+#include "munit.h"
+
 /* include test cases' include files here */
 
 #include "failmalloc_test.h"
 
-static int init_suite1(void) { return 0; }
-
-static int clean_suite1(void) { return 0; }
-
-int main(void) {
-  CU_pSuite pSuite = NULL;
-  unsigned int num_tests_failed;
-
-  /* initialize the CUnit test registry */
-  if (CUE_SUCCESS != CU_initialize_registry())
-    return (int)CU_get_error();
-
-  /* add a suite to the registry */
-  pSuite = CU_add_suite("libnghttp2_TestSuite", init_suite1, clean_suite1);
-  if (NULL == pSuite) {
-    CU_cleanup_registry();
-    return (int)CU_get_error();
-  }
-
-  /* add the tests to the suite */
-  if (!CU_add_test(pSuite, "failmalloc_session_send",
-                   test_nghttp2_session_send) ||
-      !CU_add_test(pSuite, "failmalloc_session_send_server",
-                   test_nghttp2_session_send_server) ||
-      !CU_add_test(pSuite, "failmalloc_session_recv",
-                   test_nghttp2_session_recv) ||
-      !CU_add_test(pSuite, "failmalloc_frame", test_nghttp2_frame) ||
-      !CU_add_test(pSuite, "failmalloc_hd", test_nghttp2_hd)) {
-    CU_cleanup_registry();
-    return (int)CU_get_error();
-  }
+int main(int argc, char *argv[]) {
+  const MunitSuite suites[] = {
+      failmalloc_suite,
+      {NULL, NULL, NULL, 0, MUNIT_SUITE_OPTION_NONE},
+  };
+  const MunitSuite suite = {
+      "", NULL, suites, 1, MUNIT_SUITE_OPTION_NONE,
+  };
 
-  /* Run all tests using the CUnit Basic interface */
-  CU_basic_set_mode(CU_BRM_VERBOSE);
-  CU_basic_run_tests();
-  num_tests_failed = CU_get_number_of_tests_failed();
-  CU_cleanup_registry();
-  if (CU_get_error() == CUE_SUCCESS) {
-    return (int)num_tests_failed;
-  } else {
-    printf("CUnit Error: %s\n", CU_get_error_msg());
-    return (int)CU_get_error();
-  }
+  return munit_suite_main(&suite, NULL, argc, argv);
 }
diff --git a/tests/failmalloc_test.c b/tests/failmalloc_test.c
index 594bc72..5b204fe 100644
--- a/tests/failmalloc_test.c
+++ b/tests/failmalloc_test.c
@@ -27,7 +27,7 @@
 #include <stdio.h>
 #include <assert.h>
 
-#include <CUnit/CUnit.h>
+#include "munit.h"
 
 #include "nghttp2_session.h"
 #include "nghttp2_stream.h"
@@ -36,6 +36,19 @@
 #include "malloc_wrapper.h"
 #include "nghttp2_test_helper.h"
 
+static const MunitTest tests[] = {
+    munit_void_test(test_nghttp2_session_send),
+    munit_void_test(test_nghttp2_session_send_server),
+    munit_void_test(test_nghttp2_session_recv),
+    munit_void_test(test_nghttp2_frame),
+    munit_void_test(test_nghttp2_hd),
+    munit_test_end(),
+};
+
+const MunitSuite failmalloc_suite = {
+    "/failmalloc", tests, NULL, 1, MUNIT_SUITE_OPTION_NONE,
+};
+
 typedef struct {
   uint8_t data[8192];
   uint8_t *datamark, *datalimit;
@@ -59,18 +72,20 @@ static void data_feed_init(data_feed *df, nghttp2_bufs *bufs) {
   df->datalimit = df->data + data_length;
 }
 
-static ssize_t null_send_callback(nghttp2_session *session, const uint8_t *data,
-                                  size_t len, int flags, void *user_data) {
+static nghttp2_ssize null_send_callback(nghttp2_session *session,
+                                        const uint8_t *data, size_t len,
+                                        int flags, void *user_data) {
   (void)session;
   (void)data;
   (void)flags;
   (void)user_data;
 
-  return (ssize_t)len;
+  return (nghttp2_ssize)len;
 }
 
-static ssize_t data_feed_recv_callback(nghttp2_session *session, uint8_t *data,
-                                       size_t len, int flags, void *user_data) {
+static nghttp2_ssize data_feed_recv_callback(nghttp2_session *session,
+                                             uint8_t *data, size_t len,
+                                             int flags, void *user_data) {
   data_feed *df = ((my_user_data *)user_data)->df;
   size_t avail = (size_t)(df->datalimit - df->datamark);
   size_t wlen = nghttp2_min(avail, len);
@@ -79,10 +94,10 @@ static ssize_t data_feed_recv_callback(nghttp2_session *session, uint8_t *data,
 
   memcpy(data, df->datamark, wlen);
   df->datamark += wlen;
-  return (ssize_t)wlen;
+  return (nghttp2_ssize)wlen;
 }
 
-static ssize_t fixed_length_data_source_read_callback(
+static nghttp2_ssize fixed_length_data_source_read_callback(
     nghttp2_session *session, int32_t stream_id, uint8_t *buf, size_t len,
     uint32_t *data_flags, nghttp2_data_source *source, void *user_data) {
   my_user_data *ud = (my_user_data *)user_data;
@@ -101,7 +116,7 @@ static ssize_t fixed_length_data_source_read_callback(
   if (ud->data_source_length == 0) {
     *data_flags = NGHTTP2_DATA_FLAG_EOF;
   }
-  return (ssize_t)wlen;
+  return (nghttp2_ssize)wlen;
 }
 
 #define TEST_FAILMALLOC_RUN(FUN)                                               \
@@ -129,12 +144,12 @@ static void run_nghttp2_session_send(void) {
   nghttp2_session_callbacks callbacks;
   nghttp2_nv nv[] = {MAKE_NV(":host", "example.org"),
                      MAKE_NV(":scheme", "https")};
-  nghttp2_data_provider data_prd;
+  nghttp2_data_provider2 data_prd;
   nghttp2_settings_entry iv[2];
   my_user_data ud;
   int rv;
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   data_prd.read_callback = fixed_length_data_source_read_callback;
   ud.data_source_length = 64 * 1024;
@@ -149,7 +164,7 @@ static void run_nghttp2_session_send(void) {
   if (rv != 0) {
     goto client_new_fail;
   }
-  rv = nghttp2_submit_request(session, NULL, nv, ARRLEN(nv), &data_prd, NULL);
+  rv = nghttp2_submit_request2(session, NULL, nv, ARRLEN(nv), &data_prd, NULL);
   if (rv < 0) {
     goto fail;
   }
@@ -169,7 +184,7 @@ static void run_nghttp2_session_send(void) {
   if (rv != 0) {
     goto fail;
   }
-  rv = nghttp2_submit_data(session, NGHTTP2_FLAG_END_STREAM, 3, &data_prd);
+  rv = nghttp2_submit_data2(session, NGHTTP2_FLAG_END_STREAM, 3, &data_prd);
   if (rv != 0) {
     goto fail;
   }
@@ -221,7 +236,7 @@ static void run_nghttp2_session_send_server(void) {
   nghttp2_session_callbacks *callbacks;
   int rv;
   const uint8_t *txdata;
-  ssize_t txdatalen;
+  nghttp2_ssize txdatalen;
   const uint8_t origin[] = "nghttp2.org";
   const uint8_t altsvc_field_value[] = "h2=\":443\"";
   static const uint8_t nghttp2[] = "https://nghttp2.org";
@@ -256,7 +271,7 @@ static void run_nghttp2_session_send_server(void) {
     goto fail;
   }
 
-  txdatalen = nghttp2_session_mem_send(session, &txdata);
+  txdatalen = nghttp2_session_mem_send2(session, &txdata);
 
   if (txdatalen < 0) {
     goto fail;
@@ -296,7 +311,7 @@ static void run_nghttp2_session_recv(void) {
   }
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.recv_callback = data_feed_recv_callback;
+  callbacks.recv_callback2 = data_feed_recv_callback;
   ud.df = &df;
 
   nghttp2_failmalloc_pause();
diff --git a/tests/failmalloc_test.h b/tests/failmalloc_test.h
index 576932a..9664480 100644
--- a/tests/failmalloc_test.h
+++ b/tests/failmalloc_test.h
@@ -29,10 +29,16 @@
 #  include <config.h>
 #endif /* HAVE_CONFIG_H */
 
-void test_nghttp2_session_send(void);
-void test_nghttp2_session_send_server(void);
-void test_nghttp2_session_recv(void);
-void test_nghttp2_frame(void);
-void test_nghttp2_hd(void);
+#define MUNIT_ENABLE_ASSERT_ALIASES
+
+#include "munit.h"
+
+extern const MunitSuite failmalloc_suite;
+
+munit_void_test_decl(test_nghttp2_session_send);
+munit_void_test_decl(test_nghttp2_session_send_server);
+munit_void_test_decl(test_nghttp2_session_recv);
+munit_void_test_decl(test_nghttp2_frame);
+munit_void_test_decl(test_nghttp2_hd);
 
 #endif /* FAILMALLOC_TEST_H */
diff --git a/tests/main.c b/tests/main.c
index 6827daf..ebee3de 100644
--- a/tests/main.c
+++ b/tests/main.c
@@ -26,9 +26,8 @@
 #  include <config.h>
 #endif /* HAVE_CONFIG_H */
 
-#include <stdio.h>
-#include <string.h>
-#include <CUnit/Basic.h>
+#include "munit.h"
+
 /* include test cases' include files here */
 #include "nghttp2_pq_test.h"
 #include "nghttp2_map_test.h"
@@ -46,428 +45,27 @@
 
 extern int nghttp2_enable_strict_preface;
 
-static int init_suite1(void) { return 0; }
-
-static int clean_suite1(void) { return 0; }
-
-int main(void) {
-  CU_pSuite pSuite = NULL;
-  unsigned int num_tests_failed;
+int main(int argc, char *argv[]) {
+  const MunitSuite suites[] = {
+      pq_suite,
+      map_suite,
+      queue_suite,
+      frame_suite,
+      session_suite,
+      hd_suite,
+      alpn_suite,
+      helper_suite,
+      buf_suite,
+      http_suite,
+      extpri_suite,
+      ratelim_suite,
+      {NULL, NULL, NULL, 0, MUNIT_SUITE_OPTION_NONE},
+  };
+  const MunitSuite suite = {
+      "", NULL, suites, 1, MUNIT_SUITE_OPTION_NONE,
+  };
 
   nghttp2_enable_strict_preface = 0;
 
-  /* initialize the CUnit test registry */
-  if (CUE_SUCCESS != CU_initialize_registry())
-    return (int)CU_get_error();
-
-  /* add a suite to the registry */
-  pSuite = CU_add_suite("libnghttp2_TestSuite", init_suite1, clean_suite1);
-  if (NULL == pSuite) {
-    CU_cleanup_registry();
-    return (int)CU_get_error();
-  }
-
-  /* add the tests to the suite */
-  if (!CU_add_test(pSuite, "pq", test_nghttp2_pq) ||
-      !CU_add_test(pSuite, "pq_update", test_nghttp2_pq_update) ||
-      !CU_add_test(pSuite, "pq_remove", test_nghttp2_pq_remove) ||
-      !CU_add_test(pSuite, "map", test_nghttp2_map) ||
-      !CU_add_test(pSuite, "map_functional", test_nghttp2_map_functional) ||
-      !CU_add_test(pSuite, "map_each_free", test_nghttp2_map_each_free) ||
-      !CU_add_test(pSuite, "queue", test_nghttp2_queue) ||
-      !CU_add_test(pSuite, "alpn", test_nghttp2_alpn) ||
-      !CU_add_test(pSuite, "session_recv", test_nghttp2_session_recv) ||
-      !CU_add_test(pSuite, "session_recv_invalid_stream_id",
-                   test_nghttp2_session_recv_invalid_stream_id) ||
-      !CU_add_test(pSuite, "session_recv_invalid_frame",
-                   test_nghttp2_session_recv_invalid_frame) ||
-      !CU_add_test(pSuite, "session_recv_eof", test_nghttp2_session_recv_eof) ||
-      !CU_add_test(pSuite, "session_recv_data",
-                   test_nghttp2_session_recv_data) ||
-      !CU_add_test(pSuite, "session_recv_data_no_auto_flow_control",
-                   test_nghttp2_session_recv_data_no_auto_flow_control) ||
-      !CU_add_test(pSuite, "session_recv_continuation",
-                   test_nghttp2_session_recv_continuation) ||
-      !CU_add_test(pSuite, "session_recv_headers_with_priority",
-                   test_nghttp2_session_recv_headers_with_priority) ||
-      !CU_add_test(pSuite, "session_recv_headers_with_padding",
-                   test_nghttp2_session_recv_headers_with_padding) ||
-      !CU_add_test(pSuite, "session_recv_headers_early_response",
-                   test_nghttp2_session_recv_headers_early_response) ||
-      !CU_add_test(pSuite, "session_recv_headers_for_closed_stream",
-                   test_nghttp2_session_recv_headers_for_closed_stream) ||
-      !CU_add_test(pSuite, "session_recv_headers_with_extpri",
-                   test_nghttp2_session_recv_headers_with_extpri) ||
-      !CU_add_test(pSuite, "session_server_recv_push_response",
-                   test_nghttp2_session_server_recv_push_response) ||
-      !CU_add_test(pSuite, "session_recv_premature_headers",
-                   test_nghttp2_session_recv_premature_headers) ||
-      !CU_add_test(pSuite, "session_recv_unknown_frame",
-                   test_nghttp2_session_recv_unknown_frame) ||
-      !CU_add_test(pSuite, "session_recv_unexpected_continuation",
-                   test_nghttp2_session_recv_unexpected_continuation) ||
-      !CU_add_test(pSuite, "session_recv_settings_header_table_size",
-                   test_nghttp2_session_recv_settings_header_table_size) ||
-      !CU_add_test(pSuite, "session_recv_too_large_frame_length",
-                   test_nghttp2_session_recv_too_large_frame_length) ||
-      !CU_add_test(pSuite, "session_recv_extension",
-                   test_nghttp2_session_recv_extension) ||
-      !CU_add_test(pSuite, "session_recv_altsvc",
-                   test_nghttp2_session_recv_altsvc) ||
-      !CU_add_test(pSuite, "session_recv_origin",
-                   test_nghttp2_session_recv_origin) ||
-      !CU_add_test(pSuite, "session_recv_priority_update",
-                   test_nghttp2_session_recv_priority_update) ||
-      !CU_add_test(pSuite, "session_continue", test_nghttp2_session_continue) ||
-      !CU_add_test(pSuite, "session_add_frame",
-                   test_nghttp2_session_add_frame) ||
-      !CU_add_test(pSuite, "session_on_request_headers_received",
-                   test_nghttp2_session_on_request_headers_received) ||
-      !CU_add_test(pSuite, "session_on_response_headers_received",
-                   test_nghttp2_session_on_response_headers_received) ||
-      !CU_add_test(pSuite, "session_on_headers_received",
-                   test_nghttp2_session_on_headers_received) ||
-      !CU_add_test(pSuite, "session_on_push_response_headers_received",
-                   test_nghttp2_session_on_push_response_headers_received) ||
-      !CU_add_test(pSuite, "session_on_priority_received",
-                   test_nghttp2_session_on_priority_received) ||
-      !CU_add_test(pSuite, "session_on_rst_stream_received",
-                   test_nghttp2_session_on_rst_stream_received) ||
-      !CU_add_test(pSuite, "session_on_settings_received",
-                   test_nghttp2_session_on_settings_received) ||
-      !CU_add_test(pSuite, "session_on_push_promise_received",
-                   test_nghttp2_session_on_push_promise_received) ||
-      !CU_add_test(pSuite, "session_on_ping_received",
-                   test_nghttp2_session_on_ping_received) ||
-      !CU_add_test(pSuite, "session_on_goaway_received",
-                   test_nghttp2_session_on_goaway_received) ||
-      !CU_add_test(pSuite, "session_on_window_update_received",
-                   test_nghttp2_session_on_window_update_received) ||
-      !CU_add_test(pSuite, "session_on_data_received",
-                   test_nghttp2_session_on_data_received) ||
-      !CU_add_test(pSuite, "session_on_data_received_fail_fast",
-                   test_nghttp2_session_on_data_received_fail_fast) ||
-      !CU_add_test(pSuite, "session_on_altsvc_received",
-                   test_nghttp2_session_on_altsvc_received) ||
-      !CU_add_test(pSuite, "session_send_headers_start_stream",
-                   test_nghttp2_session_send_headers_start_stream) ||
-      !CU_add_test(pSuite, "session_send_headers_reply",
-                   test_nghttp2_session_send_headers_reply) ||
-      !CU_add_test(pSuite, "session_send_headers_frame_size_error",
-                   test_nghttp2_session_send_headers_frame_size_error) ||
-      !CU_add_test(pSuite, "session_send_headers_push_reply",
-                   test_nghttp2_session_send_headers_push_reply) ||
-      !CU_add_test(pSuite, "session_send_rst_stream",
-                   test_nghttp2_session_send_rst_stream) ||
-      !CU_add_test(pSuite, "session_send_push_promise",
-                   test_nghttp2_session_send_push_promise) ||
-      !CU_add_test(pSuite, "session_is_my_stream_id",
-                   test_nghttp2_session_is_my_stream_id) ||
-      !CU_add_test(pSuite, "session_upgrade2", test_nghttp2_session_upgrade2) ||
-      !CU_add_test(pSuite, "session_reprioritize_stream",
-                   test_nghttp2_session_reprioritize_stream) ||
-      !CU_add_test(
-          pSuite, "session_reprioritize_stream_with_idle_stream_dep",
-          test_nghttp2_session_reprioritize_stream_with_idle_stream_dep) ||
-      !CU_add_test(pSuite, "submit_data", test_nghttp2_submit_data) ||
-      !CU_add_test(pSuite, "submit_data_read_length_too_large",
-                   test_nghttp2_submit_data_read_length_too_large) ||
-      !CU_add_test(pSuite, "submit_data_read_length_smallest",
-                   test_nghttp2_submit_data_read_length_smallest) ||
-      !CU_add_test(pSuite, "submit_data_twice",
-                   test_nghttp2_submit_data_twice) ||
-      !CU_add_test(pSuite, "submit_request_with_data",
-                   test_nghttp2_submit_request_with_data) ||
-      !CU_add_test(pSuite, "submit_request_without_data",
-                   test_nghttp2_submit_request_without_data) ||
-      !CU_add_test(pSuite, "submit_response_with_data",
-                   test_nghttp2_submit_response_with_data) ||
-      !CU_add_test(pSuite, "submit_response_without_data",
-                   test_nghttp2_submit_response_without_data) ||
-      !CU_add_test(pSuite, "Submit_response_push_response",
-                   test_nghttp2_submit_response_push_response) ||
-      !CU_add_test(pSuite, "submit_trailer", test_nghttp2_submit_trailer) ||
-      !CU_add_test(pSuite, "submit_headers_start_stream",
-                   test_nghttp2_submit_headers_start_stream) ||
-      !CU_add_test(pSuite, "submit_headers_reply",
-                   test_nghttp2_submit_headers_reply) ||
-      !CU_add_test(pSuite, "submit_headers_push_reply",
-                   test_nghttp2_submit_headers_push_reply) ||
-      !CU_add_test(pSuite, "submit_headers", test_nghttp2_submit_headers) ||
-      !CU_add_test(pSuite, "submit_headers_continuation",
-                   test_nghttp2_submit_headers_continuation) ||
-      !CU_add_test(pSuite, "submit_headers_continuation_extra_large",
-                   test_nghttp2_submit_headers_continuation_extra_large) ||
-      !CU_add_test(pSuite, "submit_priority", test_nghttp2_submit_priority) ||
-      !CU_add_test(pSuite, "session_submit_settings",
-                   test_nghttp2_submit_settings) ||
-      !CU_add_test(pSuite, "session_submit_settings_update_local_window_size",
-                   test_nghttp2_submit_settings_update_local_window_size) ||
-      !CU_add_test(pSuite, "session_submit_settings_multiple_times",
-                   test_nghttp2_submit_settings_multiple_times) ||
-      !CU_add_test(pSuite, "session_submit_push_promise",
-                   test_nghttp2_submit_push_promise) ||
-      !CU_add_test(pSuite, "submit_window_update",
-                   test_nghttp2_submit_window_update) ||
-      !CU_add_test(pSuite, "submit_window_update_local_window_size",
-                   test_nghttp2_submit_window_update_local_window_size) ||
-      !CU_add_test(pSuite, "submit_shutdown_notice",
-                   test_nghttp2_submit_shutdown_notice) ||
-      !CU_add_test(pSuite, "submit_invalid_nv",
-                   test_nghttp2_submit_invalid_nv) ||
-      !CU_add_test(pSuite, "submit_extension", test_nghttp2_submit_extension) ||
-      !CU_add_test(pSuite, "submit_altsvc", test_nghttp2_submit_altsvc) ||
-      !CU_add_test(pSuite, "submit_origin", test_nghttp2_submit_origin) ||
-      !CU_add_test(pSuite, "submit_priority_update",
-                   test_nghttp2_submit_priority_update) ||
-      !CU_add_test(pSuite, "submit_rst_stream",
-                   test_nghttp2_submit_rst_stream) ||
-      !CU_add_test(pSuite, "session_open_stream",
-                   test_nghttp2_session_open_stream) ||
-      !CU_add_test(pSuite, "session_open_stream_with_idle_stream_dep",
-                   test_nghttp2_session_open_stream_with_idle_stream_dep) ||
-      !CU_add_test(pSuite, "session_get_next_ob_item",
-                   test_nghttp2_session_get_next_ob_item) ||
-      !CU_add_test(pSuite, "session_pop_next_ob_item",
-                   test_nghttp2_session_pop_next_ob_item) ||
-      !CU_add_test(pSuite, "session_reply_fail",
-                   test_nghttp2_session_reply_fail) ||
-      !CU_add_test(pSuite, "session_max_concurrent_streams",
-                   test_nghttp2_session_max_concurrent_streams) ||
-      !CU_add_test(pSuite, "session_stop_data_with_rst_stream",
-                   test_nghttp2_session_stop_data_with_rst_stream) ||
-      !CU_add_test(pSuite, "session_defer_data",
-                   test_nghttp2_session_defer_data) ||
-      !CU_add_test(pSuite, "session_flow_control",
-                   test_nghttp2_session_flow_control) ||
-      !CU_add_test(pSuite, "session_flow_control_data_recv",
-                   test_nghttp2_session_flow_control_data_recv) ||
-      !CU_add_test(pSuite, "session_flow_control_data_with_padding_recv",
-                   test_nghttp2_session_flow_control_data_with_padding_recv) ||
-      !CU_add_test(pSuite, "session_data_read_temporal_failure",
-                   test_nghttp2_session_data_read_temporal_failure) ||
-      !CU_add_test(pSuite, "session_on_stream_close",
-                   test_nghttp2_session_on_stream_close) ||
-      !CU_add_test(pSuite, "session_on_ctrl_not_send",
-                   test_nghttp2_session_on_ctrl_not_send) ||
-      !CU_add_test(pSuite, "session_get_outbound_queue_size",
-                   test_nghttp2_session_get_outbound_queue_size) ||
-      !CU_add_test(pSuite, "session_get_effective_local_window_size",
-                   test_nghttp2_session_get_effective_local_window_size) ||
-      !CU_add_test(pSuite, "session_set_option",
-                   test_nghttp2_session_set_option) ||
-      !CU_add_test(pSuite, "session_data_backoff_by_high_pri_frame",
-                   test_nghttp2_session_data_backoff_by_high_pri_frame) ||
-      !CU_add_test(pSuite, "session_pack_data_with_padding",
-                   test_nghttp2_session_pack_data_with_padding) ||
-      !CU_add_test(pSuite, "session_pack_headers_with_padding",
-                   test_nghttp2_session_pack_headers_with_padding) ||
-      !CU_add_test(pSuite, "pack_settings_payload",
-                   test_nghttp2_pack_settings_payload) ||
-      !CU_add_test(pSuite, "session_stream_dep_add",
-                   test_nghttp2_session_stream_dep_add) ||
-      !CU_add_test(pSuite, "session_stream_dep_remove",
-                   test_nghttp2_session_stream_dep_remove) ||
-      !CU_add_test(pSuite, "session_stream_dep_add_subtree",
-                   test_nghttp2_session_stream_dep_add_subtree) ||
-      !CU_add_test(pSuite, "session_stream_dep_remove_subtree",
-                   test_nghttp2_session_stream_dep_remove_subtree) ||
-      !CU_add_test(
-          pSuite, "session_stream_dep_all_your_stream_are_belong_to_us",
-          test_nghttp2_session_stream_dep_all_your_stream_are_belong_to_us) ||
-      !CU_add_test(pSuite, "session_stream_attach_item",
-                   test_nghttp2_session_stream_attach_item) ||
-      !CU_add_test(pSuite, "session_stream_attach_item_subtree",
-                   test_nghttp2_session_stream_attach_item_subtree) ||
-      !CU_add_test(pSuite, "session_stream_get_state",
-                   test_nghttp2_session_stream_get_state) ||
-      !CU_add_test(pSuite, "session_stream_get_something",
-                   test_nghttp2_session_stream_get_something) ||
-      !CU_add_test(pSuite, "session_find_stream",
-                   test_nghttp2_session_find_stream) ||
-      !CU_add_test(pSuite, "session_keep_closed_stream",
-                   test_nghttp2_session_keep_closed_stream) ||
-      !CU_add_test(pSuite, "session_keep_idle_stream",
-                   test_nghttp2_session_keep_idle_stream) ||
-      !CU_add_test(pSuite, "session_detach_idle_stream",
-                   test_nghttp2_session_detach_idle_stream) ||
-      !CU_add_test(pSuite, "session_large_dep_tree",
-                   test_nghttp2_session_large_dep_tree) ||
-      !CU_add_test(pSuite, "session_graceful_shutdown",
-                   test_nghttp2_session_graceful_shutdown) ||
-      !CU_add_test(pSuite, "session_on_header_temporal_failure",
-                   test_nghttp2_session_on_header_temporal_failure) ||
-      !CU_add_test(pSuite, "session_recv_client_magic",
-                   test_nghttp2_session_recv_client_magic) ||
-      !CU_add_test(pSuite, "session_delete_data_item",
-                   test_nghttp2_session_delete_data_item) ||
-      !CU_add_test(pSuite, "session_open_idle_stream",
-                   test_nghttp2_session_open_idle_stream) ||
-      !CU_add_test(pSuite, "session_cancel_reserved_remote",
-                   test_nghttp2_session_cancel_reserved_remote) ||
-      !CU_add_test(pSuite, "session_reset_pending_headers",
-                   test_nghttp2_session_reset_pending_headers) ||
-      !CU_add_test(pSuite, "session_send_data_callback",
-                   test_nghttp2_session_send_data_callback) ||
-      !CU_add_test(pSuite, "session_on_begin_headers_temporal_failure",
-                   test_nghttp2_session_on_begin_headers_temporal_failure) ||
-      !CU_add_test(pSuite, "session_defer_then_close",
-                   test_nghttp2_session_defer_then_close) ||
-      !CU_add_test(pSuite, "session_detach_item_from_closed_stream",
-                   test_nghttp2_session_detach_item_from_closed_stream) ||
-      !CU_add_test(pSuite, "session_flooding", test_nghttp2_session_flooding) ||
-      !CU_add_test(pSuite, "session_change_stream_priority",
-                   test_nghttp2_session_change_stream_priority) ||
-      !CU_add_test(pSuite, "session_change_extpri_stream_priority",
-                   test_nghttp2_session_change_extpri_stream_priority) ||
-      !CU_add_test(pSuite, "session_create_idle_stream",
-                   test_nghttp2_session_create_idle_stream) ||
-      !CU_add_test(pSuite, "session_repeated_priority_change",
-                   test_nghttp2_session_repeated_priority_change) ||
-      !CU_add_test(pSuite, "session_repeated_priority_submission",
-                   test_nghttp2_session_repeated_priority_submission) ||
-      !CU_add_test(pSuite, "session_set_local_window_size",
-                   test_nghttp2_session_set_local_window_size) ||
-      !CU_add_test(pSuite, "session_cancel_from_before_frame_send",
-                   test_nghttp2_session_cancel_from_before_frame_send) ||
-      !CU_add_test(pSuite, "session_too_many_settings",
-                   test_nghttp2_session_too_many_settings) ||
-      !CU_add_test(pSuite, "session_removed_closed_stream",
-                   test_nghttp2_session_removed_closed_stream) ||
-      !CU_add_test(pSuite, "session_pause_data",
-                   test_nghttp2_session_pause_data) ||
-      !CU_add_test(pSuite, "session_no_closed_streams",
-                   test_nghttp2_session_no_closed_streams) ||
-      !CU_add_test(pSuite, "session_set_stream_user_data",
-                   test_nghttp2_session_set_stream_user_data) ||
-      !CU_add_test(pSuite, "session_no_rfc7540_priorities",
-                   test_nghttp2_session_no_rfc7540_priorities) ||
-      !CU_add_test(pSuite, "session_server_fallback_rfc7540_priorities",
-                   test_nghttp2_session_server_fallback_rfc7540_priorities) ||
-      !CU_add_test(pSuite, "session_stream_reset_ratelim",
-                   test_nghttp2_session_stream_reset_ratelim) ||
-      !CU_add_test(pSuite, "http_mandatory_headers",
-                   test_nghttp2_http_mandatory_headers) ||
-      !CU_add_test(pSuite, "http_content_length",
-                   test_nghttp2_http_content_length) ||
-      !CU_add_test(pSuite, "http_content_length_mismatch",
-                   test_nghttp2_http_content_length_mismatch) ||
-      !CU_add_test(pSuite, "http_non_final_response",
-                   test_nghttp2_http_non_final_response) ||
-      !CU_add_test(pSuite, "http_trailer_headers",
-                   test_nghttp2_http_trailer_headers) ||
-      !CU_add_test(pSuite, "http_ignore_regular_header",
-                   test_nghttp2_http_ignore_regular_header) ||
-      !CU_add_test(pSuite, "http_ignore_content_length",
-                   test_nghttp2_http_ignore_content_length) ||
-      !CU_add_test(pSuite, "http_record_request_method",
-                   test_nghttp2_http_record_request_method) ||
-      !CU_add_test(pSuite, "http_push_promise",
-                   test_nghttp2_http_push_promise) ||
-      !CU_add_test(pSuite, "http_head_method_upgrade_workaround",
-                   test_nghttp2_http_head_method_upgrade_workaround) ||
-      !CU_add_test(
-          pSuite, "http_no_rfc9113_leading_and_trailing_ws_validation",
-          test_nghttp2_http_no_rfc9113_leading_and_trailing_ws_validation) ||
-      !CU_add_test(pSuite, "frame_pack_headers",
-                   test_nghttp2_frame_pack_headers) ||
-      !CU_add_test(pSuite, "frame_pack_headers_frame_too_large",
-                   test_nghttp2_frame_pack_headers_frame_too_large) ||
-      !CU_add_test(pSuite, "frame_pack_priority",
-                   test_nghttp2_frame_pack_priority) ||
-      !CU_add_test(pSuite, "frame_pack_rst_stream",
-                   test_nghttp2_frame_pack_rst_stream) ||
-      !CU_add_test(pSuite, "frame_pack_settings",
-                   test_nghttp2_frame_pack_settings) ||
-      !CU_add_test(pSuite, "frame_pack_push_promise",
-                   test_nghttp2_frame_pack_push_promise) ||
-      !CU_add_test(pSuite, "frame_pack_ping", test_nghttp2_frame_pack_ping) ||
-      !CU_add_test(pSuite, "frame_pack_goaway",
-                   test_nghttp2_frame_pack_goaway) ||
-      !CU_add_test(pSuite, "frame_pack_window_update",
-                   test_nghttp2_frame_pack_window_update) ||
-      !CU_add_test(pSuite, "frame_pack_altsvc",
-                   test_nghttp2_frame_pack_altsvc) ||
-      !CU_add_test(pSuite, "frame_pack_origin",
-                   test_nghttp2_frame_pack_origin) ||
-      !CU_add_test(pSuite, "frame_pack_priority_update",
-                   test_nghttp2_frame_pack_priority_update) ||
-      !CU_add_test(pSuite, "nv_array_copy", test_nghttp2_nv_array_copy) ||
-      !CU_add_test(pSuite, "iv_check", test_nghttp2_iv_check) ||
-      !CU_add_test(pSuite, "hd_deflate", test_nghttp2_hd_deflate) ||
-      !CU_add_test(pSuite, "hd_deflate_same_indexed_repr",
-                   test_nghttp2_hd_deflate_same_indexed_repr) ||
-      !CU_add_test(pSuite, "hd_inflate_indexed",
-                   test_nghttp2_hd_inflate_indexed) ||
-      !CU_add_test(pSuite, "hd_inflate_indname_noinc",
-                   test_nghttp2_hd_inflate_indname_noinc) ||
-      !CU_add_test(pSuite, "hd_inflate_indname_inc",
-                   test_nghttp2_hd_inflate_indname_inc) ||
-      !CU_add_test(pSuite, "hd_inflate_indname_inc_eviction",
-                   test_nghttp2_hd_inflate_indname_inc_eviction) ||
-      !CU_add_test(pSuite, "hd_inflate_newname_noinc",
-                   test_nghttp2_hd_inflate_newname_noinc) ||
-      !CU_add_test(pSuite, "hd_inflate_newname_inc",
-                   test_nghttp2_hd_inflate_newname_inc) ||
-      !CU_add_test(pSuite, "hd_inflate_clearall_inc",
-                   test_nghttp2_hd_inflate_clearall_inc) ||
-      !CU_add_test(pSuite, "hd_inflate_zero_length_huffman",
-                   test_nghttp2_hd_inflate_zero_length_huffman) ||
-      !CU_add_test(pSuite, "hd_inflate_expect_table_size_update",
-                   test_nghttp2_hd_inflate_expect_table_size_update) ||
-      !CU_add_test(pSuite, "hd_inflate_unexpected_table_size_update",
-                   test_nghttp2_hd_inflate_unexpected_table_size_update) ||
-      !CU_add_test(pSuite, "hd_ringbuf_reserve",
-                   test_nghttp2_hd_ringbuf_reserve) ||
-      !CU_add_test(pSuite, "hd_change_table_size",
-                   test_nghttp2_hd_change_table_size) ||
-      !CU_add_test(pSuite, "hd_deflate_inflate",
-                   test_nghttp2_hd_deflate_inflate) ||
-      !CU_add_test(pSuite, "hd_no_index", test_nghttp2_hd_no_index) ||
-      !CU_add_test(pSuite, "hd_deflate_bound", test_nghttp2_hd_deflate_bound) ||
-      !CU_add_test(pSuite, "hd_public_api", test_nghttp2_hd_public_api) ||
-      !CU_add_test(pSuite, "hd_deflate_hd_vec",
-                   test_nghttp2_hd_deflate_hd_vec) ||
-      !CU_add_test(pSuite, "hd_decode_length", test_nghttp2_hd_decode_length) ||
-      !CU_add_test(pSuite, "hd_huff_encode", test_nghttp2_hd_huff_encode) ||
-      !CU_add_test(pSuite, "hd_huff_decode", test_nghttp2_hd_huff_decode) ||
-      !CU_add_test(pSuite, "adjust_local_window_size",
-                   test_nghttp2_adjust_local_window_size) ||
-      !CU_add_test(pSuite, "check_header_name",
-                   test_nghttp2_check_header_name) ||
-      !CU_add_test(pSuite, "check_header_value",
-                   test_nghttp2_check_header_value) ||
-      !CU_add_test(pSuite, "check_header_value_rfc9113",
-                   test_nghttp2_check_header_value_rfc9113) ||
-      !CU_add_test(pSuite, "bufs_add", test_nghttp2_bufs_add) ||
-      !CU_add_test(pSuite, "bufs_add_stack_buffer_overflow_bug",
-                   test_nghttp2_bufs_add_stack_buffer_overflow_bug) ||
-      !CU_add_test(pSuite, "bufs_addb", test_nghttp2_bufs_addb) ||
-      !CU_add_test(pSuite, "bufs_orb", test_nghttp2_bufs_orb) ||
-      !CU_add_test(pSuite, "bufs_remove", test_nghttp2_bufs_remove) ||
-      !CU_add_test(pSuite, "bufs_reset", test_nghttp2_bufs_reset) ||
-      !CU_add_test(pSuite, "bufs_advance", test_nghttp2_bufs_advance) ||
-      !CU_add_test(pSuite, "bufs_next_present",
-                   test_nghttp2_bufs_next_present) ||
-      !CU_add_test(pSuite, "bufs_realloc", test_nghttp2_bufs_realloc) ||
-      !CU_add_test(pSuite, "http_parse_priority",
-                   test_nghttp2_http_parse_priority) ||
-      !CU_add_test(pSuite, "extpri_to_uint8", test_nghttp2_extpri_to_uint8) ||
-      !CU_add_test(pSuite, "ratelim_update", test_nghttp2_ratelim_update) ||
-      !CU_add_test(pSuite, "ratelim_drain", test_nghttp2_ratelim_drain)) {
-    CU_cleanup_registry();
-    return (int)CU_get_error();
-  }
-
-  /* Run all tests using the CUnit Basic interface */
-  CU_basic_set_mode(CU_BRM_VERBOSE);
-  CU_basic_run_tests();
-  num_tests_failed = CU_get_number_of_tests_failed();
-  CU_cleanup_registry();
-  if (CU_get_error() == CUE_SUCCESS) {
-    return (int)num_tests_failed;
-  } else {
-    printf("CUnit Error: %s\n", CU_get_error_msg());
-    return (int)CU_get_error();
-  }
+  return munit_suite_main(&suite, NULL, argc, argv);
 }
diff --git a/tests/nghttp2_alpn_test.c b/tests/nghttp2_alpn_test.c
index d471d5f..805a23e 100644
--- a/tests/nghttp2_alpn_test.c
+++ b/tests/nghttp2_alpn_test.c
@@ -27,25 +27,36 @@
 #include <stdio.h>
 #include <string.h>
 
-#include <CUnit/CUnit.h>
+#include "munit.h"
+
 #include <nghttp2/nghttp2.h>
 
+static const MunitTest tests[] = {
+    munit_void_test(test_nghttp2_alpn),
+    munit_test_end(),
+};
+
+const MunitSuite alpn_suite = {
+    "/alpn", tests, NULL, 1, MUNIT_SUITE_OPTION_NONE,
+};
+
 static void http2(void) {
   const unsigned char p[] = {8,   'h', 't', 't', 'p', '/', '1', '.', '1', 2,
                              'h', '2', 6,   's', 'p', 'd', 'y', '/', '3'};
   unsigned char outlen;
   const unsigned char *out;
-  CU_ASSERT(1 == nghttp2_select_next_protocol((unsigned char **)&out, &outlen,
-                                              p, sizeof(p)));
-  CU_ASSERT(NGHTTP2_PROTO_VERSION_ID_LEN == outlen);
-  CU_ASSERT(memcmp(NGHTTP2_PROTO_VERSION_ID, out, outlen) == 0);
+  assert_int(1, ==,
+             nghttp2_select_next_protocol((unsigned char **)&out, &outlen, p,
+                                          sizeof(p)));
+  assert_uchar(NGHTTP2_PROTO_VERSION_ID_LEN, ==, outlen);
+  assert_memory_equal(outlen, NGHTTP2_PROTO_VERSION_ID, out);
 
   outlen = 0;
   out = NULL;
 
-  CU_ASSERT(1 == nghttp2_select_alpn(&out, &outlen, p, sizeof(p)));
-  CU_ASSERT(NGHTTP2_PROTO_VERSION_ID_LEN == outlen);
-  CU_ASSERT(memcmp(NGHTTP2_PROTO_VERSION_ID, out, outlen) == 0);
+  assert_int(1, ==, nghttp2_select_alpn(&out, &outlen, p, sizeof(p)));
+  assert_uchar(NGHTTP2_PROTO_VERSION_ID_LEN, ==, outlen);
+  assert_memory_equal(outlen, NGHTTP2_PROTO_VERSION_ID, out);
 }
 
 static void http11(void) {
@@ -55,17 +66,18 @@ static void http11(void) {
   };
   unsigned char outlen;
   const unsigned char *out;
-  CU_ASSERT(0 == nghttp2_select_next_protocol((unsigned char **)&out, &outlen,
-                                              spdy, sizeof(spdy)));
-  CU_ASSERT(8 == outlen);
-  CU_ASSERT(memcmp("http/1.1", out, outlen) == 0);
+  assert_int(0, ==,
+             nghttp2_select_next_protocol((unsigned char **)&out, &outlen, spdy,
+                                          sizeof(spdy)));
+  assert_uchar(8, ==, outlen);
+  assert_memory_equal(outlen, "http/1.1", out);
 
   outlen = 0;
   out = NULL;
 
-  CU_ASSERT(0 == nghttp2_select_alpn(&out, &outlen, spdy, sizeof(spdy)));
-  CU_ASSERT(8 == outlen);
-  CU_ASSERT(memcmp("http/1.1", out, outlen) == 0);
+  assert_int(0, ==, nghttp2_select_alpn(&out, &outlen, spdy, sizeof(spdy)));
+  assert_uchar(8, ==, outlen);
+  assert_memory_equal(outlen, "http/1.1", out);
 }
 
 static void no_overlap(void) {
@@ -75,17 +87,18 @@ static void no_overlap(void) {
   };
   unsigned char outlen = 0;
   const unsigned char *out = NULL;
-  CU_ASSERT(-1 == nghttp2_select_next_protocol((unsigned char **)&out, &outlen,
-                                               spdy, sizeof(spdy)));
-  CU_ASSERT(0 == outlen);
-  CU_ASSERT(NULL == out);
+  assert_int(-1, ==,
+             nghttp2_select_next_protocol((unsigned char **)&out, &outlen, spdy,
+                                          sizeof(spdy)));
+  assert_uchar(0, ==, outlen);
+  assert_null(out);
 
   outlen = 0;
   out = NULL;
 
-  CU_ASSERT(-1 == nghttp2_select_alpn(&out, &outlen, spdy, sizeof(spdy)));
-  CU_ASSERT(0 == outlen);
-  CU_ASSERT(NULL == out);
+  assert_int(-1, ==, nghttp2_select_alpn(&out, &outlen, spdy, sizeof(spdy)));
+  assert_uchar(0, ==, outlen);
+  assert_null(out);
 }
 
 void test_nghttp2_alpn(void) {
diff --git a/tests/nghttp2_alpn_test.h b/tests/nghttp2_alpn_test.h
index f797f9e..a375701 100644
--- a/tests/nghttp2_alpn_test.h
+++ b/tests/nghttp2_alpn_test.h
@@ -29,6 +29,12 @@
 #  include <config.h>
 #endif /* HAVE_CONFIG_H */
 
-void test_nghttp2_alpn(void);
+#define MUNIT_ENABLE_ASSERT_ALIASES
+
+#include "munit.h"
+
+extern const MunitSuite alpn_suite;
+
+munit_void_test_decl(test_nghttp2_alpn);
 
 #endif /* NGHTTP2_ALPN_TEST_H */
diff --git a/tests/nghttp2_assertion.h b/tests/nghttp2_assertion.h
new file mode 100644
index 0000000..28d6929
--- /dev/null
+++ b/tests/nghttp2_assertion.h
@@ -0,0 +1,56 @@
+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2024 nghttp2 contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#ifndef NGHTTP2_ASSERTION_H
+#define NGHTTP2_ASSERTION_H
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif /* HAVE_CONFIG_H */
+
+#include "munit.h"
+
+#include "nghttp2_frame.h"
+
+#define assert_nv_equal(A, B, len, mem)                                        \
+  do {                                                                         \
+    size_t alloclen = sizeof(nghttp2_nv) * (len);                              \
+    const nghttp2_nv *sa = (A), *sb = (B);                                     \
+    nghttp2_nv *a = (mem)->malloc(alloclen, NULL);                             \
+    nghttp2_nv *b = (mem)->malloc(alloclen, NULL);                             \
+    size_t i_;                                                                 \
+    memcpy(a, sa, alloclen);                                                   \
+    memcpy(b, sb, alloclen);                                                   \
+    nghttp2_nv_array_sort(a, (len));                                           \
+    nghttp2_nv_array_sort(b, (len));                                           \
+    for (i_ = 0; i_ < (size_t)(len); ++i_) {                                   \
+      assert_memn_equal(a[i_].name, a[i_].namelen, b[i_].name, b[i_].namelen); \
+      assert_memn_equal(a[i_].value, a[i_].valuelen, b[i_].value,              \
+                        b[i_].valuelen);                                       \
+    }                                                                          \
+    (mem)->free(b, NULL);                                                      \
+    (mem)->free(a, NULL);                                                      \
+  } while (0);
+
+#endif /* NGHTTP2_ASSERTION_H */
diff --git a/tests/nghttp2_buf_test.c b/tests/nghttp2_buf_test.c
index e3e8a14..43d53f6 100644
--- a/tests/nghttp2_buf_test.c
+++ b/tests/nghttp2_buf_test.c
@@ -26,11 +26,28 @@
 
 #include <stdio.h>
 
-#include <CUnit/CUnit.h>
+#include "munit.h"
 
 #include "nghttp2_buf.h"
 #include "nghttp2_test_helper.h"
 
+static const MunitTest tests[] = {
+    munit_void_test(test_nghttp2_bufs_add),
+    munit_void_test(test_nghttp2_bufs_add_stack_buffer_overflow_bug),
+    munit_void_test(test_nghttp2_bufs_addb),
+    munit_void_test(test_nghttp2_bufs_orb),
+    munit_void_test(test_nghttp2_bufs_remove),
+    munit_void_test(test_nghttp2_bufs_reset),
+    munit_void_test(test_nghttp2_bufs_advance),
+    munit_void_test(test_nghttp2_bufs_next_present),
+    munit_void_test(test_nghttp2_bufs_realloc),
+    munit_test_end(),
+};
+
+const MunitSuite buf_suite = {
+    "/buf", tests, NULL, 1, MUNIT_SUITE_OPTION_NONE,
+};
+
 void test_nghttp2_bufs_add(void) {
   int rv;
   nghttp2_bufs bufs;
@@ -40,27 +57,27 @@ void test_nghttp2_bufs_add(void) {
   mem = nghttp2_mem_default();
 
   rv = nghttp2_bufs_init(&bufs, 1000, 3, mem);
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
-  CU_ASSERT(bufs.cur->buf.pos == bufs.cur->buf.last);
+  assert_ptr_equal(bufs.cur->buf.pos, bufs.cur->buf.last);
 
   rv = nghttp2_bufs_add(&bufs, data, 493);
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(493 == nghttp2_buf_len(&bufs.cur->buf));
-  CU_ASSERT(493 == nghttp2_bufs_len(&bufs));
-  CU_ASSERT(507 == nghttp2_bufs_cur_avail(&bufs));
+  assert_int(0, ==, rv);
+  assert_size(493, ==, nghttp2_buf_len(&bufs.cur->buf));
+  assert_size(493, ==, nghttp2_bufs_len(&bufs));
+  assert_size(507, ==, nghttp2_bufs_cur_avail(&bufs));
 
   rv = nghttp2_bufs_add(&bufs, data, 507);
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(1000 == nghttp2_buf_len(&bufs.cur->buf));
-  CU_ASSERT(1000 == nghttp2_bufs_len(&bufs));
-  CU_ASSERT(bufs.cur == bufs.head);
+  assert_int(0, ==, rv);
+  assert_size(1000, ==, nghttp2_buf_len(&bufs.cur->buf));
+  assert_size(1000, ==, nghttp2_bufs_len(&bufs));
+  assert_ptr_equal(bufs.cur, bufs.head);
 
   rv = nghttp2_bufs_add(&bufs, data, 1);
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(1 == nghttp2_buf_len(&bufs.cur->buf));
-  CU_ASSERT(1001 == nghttp2_bufs_len(&bufs));
-  CU_ASSERT(bufs.cur == bufs.head->next);
+  assert_int(0, ==, rv);
+  assert_size(1, ==, nghttp2_buf_len(&bufs.cur->buf));
+  assert_size(1001, ==, nghttp2_bufs_len(&bufs));
+  assert_ptr_equal(bufs.cur, bufs.head->next);
 
   nghttp2_bufs_free(&bufs);
 }
@@ -75,12 +92,12 @@ void test_nghttp2_bufs_add_stack_buffer_overflow_bug(void) {
   mem = nghttp2_mem_default();
 
   rv = nghttp2_bufs_init(&bufs, 100, 200, mem);
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   rv = nghttp2_bufs_add(&bufs, data, sizeof(data));
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(sizeof(data) == nghttp2_bufs_len(&bufs));
+  assert_int(0, ==, rv);
+  assert_size(sizeof(data), ==, nghttp2_bufs_len(&bufs));
 
   nghttp2_bufs_free(&bufs);
 }
@@ -88,65 +105,65 @@ void test_nghttp2_bufs_add_stack_buffer_overflow_bug(void) {
 void test_nghttp2_bufs_addb(void) {
   int rv;
   nghttp2_bufs bufs;
-  ssize_t i;
+  size_t i;
   nghttp2_mem *mem;
 
   mem = nghttp2_mem_default();
 
   rv = nghttp2_bufs_init(&bufs, 1000, 3, mem);
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   rv = nghttp2_bufs_addb(&bufs, 14);
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(1 == nghttp2_buf_len(&bufs.cur->buf));
-  CU_ASSERT(1 == nghttp2_bufs_len(&bufs));
-  CU_ASSERT(14 == *bufs.cur->buf.pos);
+  assert_int(0, ==, rv);
+  assert_size(1, ==, nghttp2_buf_len(&bufs.cur->buf));
+  assert_size(1, ==, nghttp2_bufs_len(&bufs));
+  assert_uint8(14, ==, *bufs.cur->buf.pos);
 
   for (i = 0; i < 999; ++i) {
     rv = nghttp2_bufs_addb(&bufs, 254);
 
-    CU_ASSERT(0 == rv);
-    CU_ASSERT((size_t)(i + 2) == nghttp2_buf_len(&bufs.cur->buf));
-    CU_ASSERT((size_t)(i + 2) == nghttp2_bufs_len(&bufs));
-    CU_ASSERT(254 == *(bufs.cur->buf.last - 1));
-    CU_ASSERT(bufs.cur == bufs.head);
+    assert_int(0, ==, rv);
+    assert_size(i + 2, ==, nghttp2_buf_len(&bufs.cur->buf));
+    assert_size(i + 2, ==, nghttp2_bufs_len(&bufs));
+    assert_uint8(254, ==, *(bufs.cur->buf.last - 1));
+    assert_ptr_equal(bufs.cur, bufs.head);
   }
 
   rv = nghttp2_bufs_addb(&bufs, 253);
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(1 == nghttp2_buf_len(&bufs.cur->buf));
-  CU_ASSERT(1001 == nghttp2_bufs_len(&bufs));
-  CU_ASSERT(253 == *(bufs.cur->buf.last - 1));
-  CU_ASSERT(bufs.cur == bufs.head->next);
+  assert_int(0, ==, rv);
+  assert_size(1, ==, nghttp2_buf_len(&bufs.cur->buf));
+  assert_size(1001, ==, nghttp2_bufs_len(&bufs));
+  assert_uint8(253, ==, *(bufs.cur->buf.last - 1));
+  assert_ptr_equal(bufs.cur, bufs.head->next);
 
   rv = nghttp2_bufs_addb_hold(&bufs, 15);
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(1 == nghttp2_buf_len(&bufs.cur->buf));
-  CU_ASSERT(1001 == nghttp2_bufs_len(&bufs));
-  CU_ASSERT(15 == *(bufs.cur->buf.last));
+  assert_int(0, ==, rv);
+  assert_size(1, ==, nghttp2_buf_len(&bufs.cur->buf));
+  assert_size(1001, ==, nghttp2_bufs_len(&bufs));
+  assert_uint8(15, ==, *(bufs.cur->buf.last));
 
   /* test fast version */
 
   nghttp2_bufs_fast_addb(&bufs, 240);
 
-  CU_ASSERT(2 == nghttp2_buf_len(&bufs.cur->buf));
-  CU_ASSERT(1002 == nghttp2_bufs_len(&bufs));
-  CU_ASSERT(240 == *(bufs.cur->buf.last - 1));
+  assert_size(2, ==, nghttp2_buf_len(&bufs.cur->buf));
+  assert_size(1002, ==, nghttp2_bufs_len(&bufs));
+  assert_uint8(240, ==, *(bufs.cur->buf.last - 1));
 
   nghttp2_bufs_fast_addb_hold(&bufs, 113);
 
-  CU_ASSERT(2 == nghttp2_buf_len(&bufs.cur->buf));
-  CU_ASSERT(1002 == nghttp2_bufs_len(&bufs));
-  CU_ASSERT(113 == *(bufs.cur->buf.last));
+  assert_size(2, ==, nghttp2_buf_len(&bufs.cur->buf));
+  assert_size(1002, ==, nghttp2_bufs_len(&bufs));
+  assert_uint8(113, ==, *(bufs.cur->buf.last));
 
   /* addb_hold when last == end */
   bufs.cur->buf.last = bufs.cur->buf.end;
 
   rv = nghttp2_bufs_addb_hold(&bufs, 19);
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(0 == nghttp2_buf_len(&bufs.cur->buf));
-  CU_ASSERT(2000 == nghttp2_bufs_len(&bufs));
-  CU_ASSERT(19 == *(bufs.cur->buf.last));
+  assert_int(0, ==, rv);
+  assert_size(0, ==, nghttp2_buf_len(&bufs.cur->buf));
+  assert_size(2000, ==, nghttp2_bufs_len(&bufs));
+  assert_uint8(19, ==, *(bufs.cur->buf.last));
 
   nghttp2_bufs_free(&bufs);
 }
@@ -159,28 +176,28 @@ void test_nghttp2_bufs_orb(void) {
   mem = nghttp2_mem_default();
 
   rv = nghttp2_bufs_init(&bufs, 1000, 3, mem);
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   *(bufs.cur->buf.last) = 0;
 
   rv = nghttp2_bufs_orb_hold(&bufs, 15);
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(0 == nghttp2_buf_len(&bufs.cur->buf));
-  CU_ASSERT(0 == nghttp2_bufs_len(&bufs));
-  CU_ASSERT(15 == *(bufs.cur->buf.last));
+  assert_int(0, ==, rv);
+  assert_size(0, ==, nghttp2_buf_len(&bufs.cur->buf));
+  assert_size(0, ==, nghttp2_bufs_len(&bufs));
+  assert_uint8(15, ==, *(bufs.cur->buf.last));
 
   rv = nghttp2_bufs_orb(&bufs, 240);
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(1 == nghttp2_buf_len(&bufs.cur->buf));
-  CU_ASSERT(1 == nghttp2_bufs_len(&bufs));
-  CU_ASSERT(255 == *(bufs.cur->buf.last - 1));
+  assert_int(0, ==, rv);
+  assert_size(1, ==, nghttp2_buf_len(&bufs.cur->buf));
+  assert_size(1, ==, nghttp2_bufs_len(&bufs));
+  assert_uint8(255, ==, *(bufs.cur->buf.last - 1));
 
   *(bufs.cur->buf.last) = 0;
   nghttp2_bufs_fast_orb_hold(&bufs, 240);
-  CU_ASSERT(240 == *(bufs.cur->buf.last));
+  assert_uint8(240, ==, *(bufs.cur->buf.last));
 
   nghttp2_bufs_fast_orb(&bufs, 15);
-  CU_ASSERT(255 == *(bufs.cur->buf.last - 1));
+  assert_uint8(255, ==, *(bufs.cur->buf.last - 1));
 
   nghttp2_bufs_free(&bufs);
 }
@@ -191,36 +208,36 @@ void test_nghttp2_bufs_remove(void) {
   nghttp2_buf_chain *chain;
   int i;
   uint8_t *out;
-  ssize_t outlen;
+  nghttp2_ssize outlen;
   nghttp2_mem *mem;
 
   mem = nghttp2_mem_default();
 
   rv = nghttp2_bufs_init(&bufs, 1000, 3, mem);
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   nghttp2_buf_shift_right(&bufs.cur->buf, 10);
 
   rv = nghttp2_bufs_add(&bufs, "hello ", 6);
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   for (i = 0; i < 2; ++i) {
     chain = bufs.cur;
 
     rv = nghttp2_bufs_advance(&bufs);
-    CU_ASSERT(0 == rv);
+    assert_int(0, ==, rv);
 
-    CU_ASSERT(chain->next == bufs.cur);
+    assert_ptr_equal(chain->next, bufs.cur);
   }
 
   rv = nghttp2_bufs_add(&bufs, "world", 5);
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   outlen = nghttp2_bufs_remove(&bufs, &out);
-  CU_ASSERT(11 == outlen);
+  assert_ptrdiff(11, ==, outlen);
 
-  CU_ASSERT(0 == memcmp("hello world", out, (size_t)outlen));
-  CU_ASSERT(11 == nghttp2_bufs_len(&bufs));
+  assert_memory_equal((size_t)outlen, "hello world", out);
+  assert_size(11, ==, nghttp2_bufs_len(&bufs));
 
   mem->free(out, NULL);
   nghttp2_bufs_free(&bufs);
@@ -236,30 +253,30 @@ void test_nghttp2_bufs_reset(void) {
   mem = nghttp2_mem_default();
 
   rv = nghttp2_bufs_init3(&bufs, 250, 3, 1, offset, mem);
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   rv = nghttp2_bufs_add(&bufs, "foo", 3);
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   rv = nghttp2_bufs_advance(&bufs);
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   rv = nghttp2_bufs_add(&bufs, "bar", 3);
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
-  CU_ASSERT(6 == nghttp2_bufs_len(&bufs));
+  assert_size(6, ==, nghttp2_bufs_len(&bufs));
 
   nghttp2_bufs_reset(&bufs);
 
-  CU_ASSERT(0 == nghttp2_bufs_len(&bufs));
-  CU_ASSERT(bufs.cur == bufs.head);
+  assert_size(0, ==, nghttp2_bufs_len(&bufs));
+  assert_ptr_equal(bufs.cur, bufs.head);
 
   for (ci = bufs.head; ci; ci = ci->next) {
-    CU_ASSERT((ssize_t)offset == ci->buf.pos - ci->buf.begin);
-    CU_ASSERT(ci->buf.pos == ci->buf.last);
+    assert_ptrdiff((ptrdiff_t)offset, ==, ci->buf.pos - ci->buf.begin);
+    assert_ptr_equal(ci->buf.pos, ci->buf.last);
   }
 
-  CU_ASSERT(bufs.head->next == NULL);
+  assert_null(bufs.head->next);
 
   nghttp2_bufs_free(&bufs);
 }
@@ -273,15 +290,15 @@ void test_nghttp2_bufs_advance(void) {
   mem = nghttp2_mem_default();
 
   rv = nghttp2_bufs_init(&bufs, 250, 3, mem);
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   for (i = 0; i < 2; ++i) {
     rv = nghttp2_bufs_advance(&bufs);
-    CU_ASSERT(0 == rv);
+    assert_int(0, ==, rv);
   }
 
   rv = nghttp2_bufs_advance(&bufs);
-  CU_ASSERT(NGHTTP2_ERR_BUFFER_ERROR == rv);
+  assert_int(NGHTTP2_ERR_BUFFER_ERROR, ==, rv);
 
   nghttp2_bufs_free(&bufs);
 }
@@ -294,25 +311,25 @@ void test_nghttp2_bufs_next_present(void) {
   mem = nghttp2_mem_default();
 
   rv = nghttp2_bufs_init(&bufs, 250, 3, mem);
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
-  CU_ASSERT(0 == nghttp2_bufs_next_present(&bufs));
+  assert_false(nghttp2_bufs_next_present(&bufs));
 
   rv = nghttp2_bufs_advance(&bufs);
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   nghttp2_bufs_rewind(&bufs);
 
-  CU_ASSERT(0 == nghttp2_bufs_next_present(&bufs));
+  assert_false(nghttp2_bufs_next_present(&bufs));
 
   bufs.cur = bufs.head->next;
 
   rv = nghttp2_bufs_addb(&bufs, 1);
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   nghttp2_bufs_rewind(&bufs);
 
-  CU_ASSERT(0 != nghttp2_bufs_next_present(&bufs));
+  assert_true(nghttp2_bufs_next_present(&bufs));
 
   nghttp2_bufs_free(&bufs);
 }
@@ -325,20 +342,20 @@ void test_nghttp2_bufs_realloc(void) {
   mem = nghttp2_mem_default();
 
   rv = nghttp2_bufs_init3(&bufs, 266, 3, 1, 10, mem);
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   /* Create new buffer to see that these buffers are deallocated on
      realloc */
   rv = nghttp2_bufs_advance(&bufs);
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   rv = nghttp2_bufs_realloc(&bufs, 522);
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
-  CU_ASSERT(512 == nghttp2_bufs_cur_avail(&bufs));
+  assert_size(512, ==, nghttp2_bufs_cur_avail(&bufs));
 
   rv = nghttp2_bufs_realloc(&bufs, 9);
-  CU_ASSERT(NGHTTP2_ERR_INVALID_ARGUMENT == rv);
+  assert_int(NGHTTP2_ERR_INVALID_ARGUMENT, ==, rv);
 
   nghttp2_bufs_free(&bufs);
 }
diff --git a/tests/nghttp2_buf_test.h b/tests/nghttp2_buf_test.h
index 714b89f..0bbab89 100644
--- a/tests/nghttp2_buf_test.h
+++ b/tests/nghttp2_buf_test.h
@@ -29,14 +29,20 @@
 #  include <config.h>
 #endif /* HAVE_CONFIG_H */
 
-void test_nghttp2_bufs_add(void);
-void test_nghttp2_bufs_add_stack_buffer_overflow_bug(void);
-void test_nghttp2_bufs_addb(void);
-void test_nghttp2_bufs_orb(void);
-void test_nghttp2_bufs_remove(void);
-void test_nghttp2_bufs_reset(void);
-void test_nghttp2_bufs_advance(void);
-void test_nghttp2_bufs_next_present(void);
-void test_nghttp2_bufs_realloc(void);
+#define MUNIT_ENABLE_ASSERT_ALIASES
+
+#include "munit.h"
+
+extern const MunitSuite buf_suite;
+
+munit_void_test_decl(test_nghttp2_bufs_add);
+munit_void_test_decl(test_nghttp2_bufs_add_stack_buffer_overflow_bug);
+munit_void_test_decl(test_nghttp2_bufs_addb);
+munit_void_test_decl(test_nghttp2_bufs_orb);
+munit_void_test_decl(test_nghttp2_bufs_remove);
+munit_void_test_decl(test_nghttp2_bufs_reset);
+munit_void_test_decl(test_nghttp2_bufs_advance);
+munit_void_test_decl(test_nghttp2_bufs_next_present);
+munit_void_test_decl(test_nghttp2_bufs_realloc);
 
 #endif /* NGHTTP2_BUF_TEST_H */
diff --git a/tests/nghttp2_extpri_test.c b/tests/nghttp2_extpri_test.c
index 0ef59b7..a589b93 100644
--- a/tests/nghttp2_extpri_test.c
+++ b/tests/nghttp2_extpri_test.c
@@ -27,26 +27,35 @@
 
 #include <stdio.h>
 
-#include <CUnit/CUnit.h>
+#include "munit.h"
 
 #include "nghttp2_extpri.h"
 #include "nghttp2_test_helper.h"
 
+static const MunitTest tests[] = {
+    munit_void_test(test_nghttp2_extpri_to_uint8),
+    munit_test_end(),
+};
+
+const MunitSuite extpri_suite = {
+    "/extpri", tests, NULL, 1, MUNIT_SUITE_OPTION_NONE,
+};
+
 void test_nghttp2_extpri_to_uint8(void) {
   {
     nghttp2_extpri pri = {1, 0};
-    CU_ASSERT(1 == nghttp2_extpri_to_uint8(&pri));
+    assert_uint8(1, ==, nghttp2_extpri_to_uint8(&pri));
   }
   {
     nghttp2_extpri pri = {1, 1};
-    CU_ASSERT((0x80 | 1) == nghttp2_extpri_to_uint8(&pri));
+    assert_uint8((0x80 | 1), ==, nghttp2_extpri_to_uint8(&pri));
   }
   {
     nghttp2_extpri pri = {7, 1};
-    CU_ASSERT((0x80 | 7) == nghttp2_extpri_to_uint8(&pri));
+    assert_uint8((0x80 | 7), ==, nghttp2_extpri_to_uint8(&pri));
   }
   {
     nghttp2_extpri pri = {7, 0};
-    CU_ASSERT(7 == nghttp2_extpri_to_uint8(&pri));
+    assert_uint8(7, ==, nghttp2_extpri_to_uint8(&pri));
   }
 }
diff --git a/tests/nghttp2_extpri_test.h b/tests/nghttp2_extpri_test.h
index a8a93b9..8735882 100644
--- a/tests/nghttp2_extpri_test.h
+++ b/tests/nghttp2_extpri_test.h
@@ -30,6 +30,12 @@
 #  include <config.h>
 #endif /* HAVE_CONFIG_H */
 
-void test_nghttp2_extpri_to_uint8(void);
+#define MUNIT_ENABLE_ASSERT_ALIASES
+
+#include "munit.h"
+
+extern const MunitSuite extpri_suite;
+
+munit_void_test_decl(test_nghttp2_extpri_to_uint8);
 
 #endif /* NGHTTP2_EXTPRI_TEST_H */
diff --git a/tests/nghttp2_frame_test.c b/tests/nghttp2_frame_test.c
index 7ce98dd..474f154 100644
--- a/tests/nghttp2_frame_test.c
+++ b/tests/nghttp2_frame_test.c
@@ -27,13 +27,35 @@
 #include <assert.h>
 #include <stdio.h>
 
-#include <CUnit/CUnit.h>
+#include "munit.h"
 
 #include "nghttp2_frame.h"
 #include "nghttp2_helper.h"
 #include "nghttp2_test_helper.h"
 #include "nghttp2_priority_spec.h"
 
+static MunitTest tests[] = {
+    munit_void_test(test_nghttp2_frame_pack_headers),
+    munit_void_test(test_nghttp2_frame_pack_headers_frame_too_large),
+    munit_void_test(test_nghttp2_frame_pack_priority),
+    munit_void_test(test_nghttp2_frame_pack_rst_stream),
+    munit_void_test(test_nghttp2_frame_pack_settings),
+    munit_void_test(test_nghttp2_frame_pack_push_promise),
+    munit_void_test(test_nghttp2_frame_pack_ping),
+    munit_void_test(test_nghttp2_frame_pack_goaway),
+    munit_void_test(test_nghttp2_frame_pack_window_update),
+    munit_void_test(test_nghttp2_frame_pack_altsvc),
+    munit_void_test(test_nghttp2_frame_pack_origin),
+    munit_void_test(test_nghttp2_frame_pack_priority_update),
+    munit_void_test(test_nghttp2_nv_array_copy),
+    munit_void_test(test_nghttp2_iv_check),
+    munit_test_end(),
+};
+
+const MunitSuite frame_suite = {
+    "/frame", tests, NULL, 1, MUNIT_SUITE_OPTION_NONE,
+};
+
 static nghttp2_nv make_nv(const char *name, const char *value) {
   nghttp2_nv nv;
   nv.name = (uint8_t *)name;
@@ -61,11 +83,11 @@ static nghttp2_nv *headers(nghttp2_mem *mem) {
 
 static void check_frame_header(size_t length, uint8_t type, uint8_t flags,
                                int32_t stream_id, nghttp2_frame_hd *hd) {
-  CU_ASSERT(length == hd->length);
-  CU_ASSERT(type == hd->type);
-  CU_ASSERT(flags == hd->flags);
-  CU_ASSERT(stream_id == hd->stream_id);
-  CU_ASSERT(0 == hd->reserved);
+  assert_size(length, ==, hd->length);
+  assert_uint8(type, ==, hd->type);
+  assert_uint8(flags, ==, hd->flags);
+  assert_int32(stream_id, ==, hd->stream_id);
+  assert_uint8(0, ==, hd->reserved);
 }
 
 void test_nghttp2_frame_pack_headers(void) {
@@ -100,24 +122,24 @@ void test_nghttp2_frame_pack_headers(void) {
 
   nghttp2_bufs_rewind(&bufs);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(nghttp2_bufs_len(&bufs) > 0);
-  CU_ASSERT(0 == unpack_framebuf((nghttp2_frame *)&oframe, &bufs));
+  assert_int(0, ==, rv);
+  assert_size(0, <, nghttp2_bufs_len(&bufs));
+  assert_int(0, ==, unpack_framebuf((nghttp2_frame *)&oframe, &bufs));
 
   check_frame_header(nghttp2_bufs_len(&bufs) - NGHTTP2_FRAME_HDLEN,
                      NGHTTP2_HEADERS,
                      NGHTTP2_FLAG_END_STREAM | NGHTTP2_FLAG_END_HEADERS,
                      1000000007, &oframe.hd);
   /* We did not include PRIORITY flag */
-  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT == oframe.pri_spec.weight);
+  assert_int32(NGHTTP2_DEFAULT_WEIGHT, ==, oframe.pri_spec.weight);
 
   hdblocklen = nghttp2_bufs_len(&bufs) - NGHTTP2_FRAME_HDLEN;
-  CU_ASSERT((ssize_t)hdblocklen ==
-            inflate_hd(&inflater, &out, &bufs, NGHTTP2_FRAME_HDLEN, mem));
+  assert_ptrdiff((nghttp2_ssize)hdblocklen, ==,
+                 inflate_hd(&inflater, &out, &bufs, NGHTTP2_FRAME_HDLEN, mem));
 
-  CU_ASSERT(7 == out.nvlen);
-  CU_ASSERT(nvnameeq("method", &out.nva[0]));
-  CU_ASSERT(nvvalueeq("GET", &out.nva[0]));
+  assert_size(7, ==, out.nvlen);
+  assert_true(nvnameeq("method", &out.nva[0]));
+  assert_true(nvvalueeq("GET", &out.nva[0]));
 
   nghttp2_frame_headers_free(&oframe, mem);
   nva_out_reset(&out, mem);
@@ -130,9 +152,9 @@ void test_nghttp2_frame_pack_headers(void) {
 
   rv = nghttp2_frame_pack_headers(&bufs, &frame, &deflater);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(nghttp2_bufs_len(&bufs) > 0);
-  CU_ASSERT(0 == unpack_framebuf((nghttp2_frame *)&oframe, &bufs));
+  assert_int(0, ==, rv);
+  assert_size(0, <, nghttp2_bufs_len(&bufs));
+  assert_int(0, ==, unpack_framebuf((nghttp2_frame *)&oframe, &bufs));
 
   check_frame_header(nghttp2_bufs_len(&bufs) - NGHTTP2_FRAME_HDLEN,
                      NGHTTP2_HEADERS,
@@ -140,20 +162,20 @@ void test_nghttp2_frame_pack_headers(void) {
                          NGHTTP2_FLAG_PRIORITY,
                      1000000007, &oframe.hd);
 
-  CU_ASSERT(1000000009 == oframe.pri_spec.stream_id);
-  CU_ASSERT(12 == oframe.pri_spec.weight);
-  CU_ASSERT(1 == oframe.pri_spec.exclusive);
+  assert_int32(1000000009, ==, oframe.pri_spec.stream_id);
+  assert_int32(12, ==, oframe.pri_spec.weight);
+  assert_true(oframe.pri_spec.exclusive);
 
   hdblocklen = nghttp2_bufs_len(&bufs) - NGHTTP2_FRAME_HDLEN -
                nghttp2_frame_priority_len(oframe.hd.flags);
-  CU_ASSERT((ssize_t)hdblocklen ==
-            inflate_hd(&inflater, &out, &bufs,
-                       NGHTTP2_FRAME_HDLEN +
-                           nghttp2_frame_priority_len(oframe.hd.flags),
-                       mem));
+  assert_ptrdiff((nghttp2_ssize)hdblocklen, ==,
+                 inflate_hd(&inflater, &out, &bufs,
+                            NGHTTP2_FRAME_HDLEN +
+                                nghttp2_frame_priority_len(oframe.hd.flags),
+                            mem));
 
   nghttp2_nv_array_sort(out.nva, out.nvlen);
-  CU_ASSERT(nvnameeq("method", &out.nva[0]));
+  assert_true(nvnameeq("method", &out.nva[0]));
 
   nghttp2_frame_headers_free(&oframe, mem);
   nva_out_reset(&out, mem);
@@ -196,7 +218,7 @@ void test_nghttp2_frame_pack_headers_frame_too_large(void) {
       &frame, NGHTTP2_FLAG_END_STREAM | NGHTTP2_FLAG_END_HEADERS, 1000000007,
       NGHTTP2_HCAT_REQUEST, NULL, nva, big_hdslen);
   rv = nghttp2_frame_pack_headers(&bufs, &frame, &deflater);
-  CU_ASSERT(NGHTTP2_ERR_HEADER_COMP == rv);
+  assert_int(NGHTTP2_ERR_HEADER_COMP, ==, rv);
 
   nghttp2_frame_headers_free(&frame, mem);
   nghttp2_bufs_free(&bufs);
@@ -219,14 +241,14 @@ void test_nghttp2_frame_pack_priority(void) {
   nghttp2_frame_priority_init(&frame, 1000000007, &pri_spec);
   nghttp2_frame_pack_priority(&bufs, &frame);
 
-  CU_ASSERT(NGHTTP2_FRAME_HDLEN + 5 == nghttp2_bufs_len(&bufs));
-  CU_ASSERT(0 == unpack_framebuf((nghttp2_frame *)&oframe, &bufs));
+  assert_size(NGHTTP2_FRAME_HDLEN + 5, ==, nghttp2_bufs_len(&bufs));
+  assert_int(0, ==, unpack_framebuf((nghttp2_frame *)&oframe, &bufs));
   check_frame_header(5, NGHTTP2_PRIORITY, NGHTTP2_FLAG_NONE, 1000000007,
                      &oframe.hd);
 
-  CU_ASSERT(1000000009 == oframe.pri_spec.stream_id);
-  CU_ASSERT(12 == oframe.pri_spec.weight);
-  CU_ASSERT(1 == oframe.pri_spec.exclusive);
+  assert_int32(1000000009, ==, oframe.pri_spec.stream_id);
+  assert_int32(12, ==, oframe.pri_spec.weight);
+  assert_true(oframe.pri_spec.exclusive);
 
   nghttp2_frame_priority_free(&oframe);
   nghttp2_bufs_reset(&bufs);
@@ -244,11 +266,11 @@ void test_nghttp2_frame_pack_rst_stream(void) {
   nghttp2_frame_rst_stream_init(&frame, 1000000007, NGHTTP2_PROTOCOL_ERROR);
   nghttp2_frame_pack_rst_stream(&bufs, &frame);
 
-  CU_ASSERT(NGHTTP2_FRAME_HDLEN + 4 == nghttp2_bufs_len(&bufs));
-  CU_ASSERT(0 == unpack_framebuf((nghttp2_frame *)&oframe, &bufs));
+  assert_size(NGHTTP2_FRAME_HDLEN + 4, ==, nghttp2_bufs_len(&bufs));
+  assert_int(0, ==, unpack_framebuf((nghttp2_frame *)&oframe, &bufs));
   check_frame_header(4, NGHTTP2_RST_STREAM, NGHTTP2_FLAG_NONE, 1000000007,
                      &oframe.hd);
-  CU_ASSERT(NGHTTP2_PROTOCOL_ERROR == oframe.error_code);
+  assert_uint32(NGHTTP2_PROTOCOL_ERROR, ==, oframe.error_code);
 
   nghttp2_frame_rst_stream_free(&oframe);
   nghttp2_bufs_reset(&bufs);
@@ -257,12 +279,12 @@ void test_nghttp2_frame_pack_rst_stream(void) {
   frame.error_code = 1000000009;
   nghttp2_frame_pack_rst_stream(&bufs, &frame);
 
-  CU_ASSERT(0 == unpack_framebuf((nghttp2_frame *)&oframe, &bufs));
+  assert_int(0, ==, unpack_framebuf((nghttp2_frame *)&oframe, &bufs));
 
   check_frame_header(4, NGHTTP2_RST_STREAM, NGHTTP2_FLAG_NONE, 1000000007,
                      &oframe.hd);
 
-  CU_ASSERT(1000000009 == oframe.error_code);
+  assert_uint32(1000000009, ==, oframe.error_code);
 
   nghttp2_frame_rst_stream_free(&oframe);
 
@@ -288,17 +310,17 @@ void test_nghttp2_frame_pack_settings(void) {
                               nghttp2_frame_iv_copy(iv, 3, mem), 3);
   rv = nghttp2_frame_pack_settings(&bufs, &frame);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(NGHTTP2_FRAME_HDLEN + 3 * NGHTTP2_FRAME_SETTINGS_ENTRY_LENGTH ==
-            nghttp2_bufs_len(&bufs));
+  assert_int(0, ==, rv);
+  assert_size(NGHTTP2_FRAME_HDLEN + 3 * NGHTTP2_FRAME_SETTINGS_ENTRY_LENGTH, ==,
+              nghttp2_bufs_len(&bufs));
 
-  CU_ASSERT(0 == unpack_framebuf((nghttp2_frame *)&oframe, &bufs));
+  assert_int(0, ==, unpack_framebuf((nghttp2_frame *)&oframe, &bufs));
   check_frame_header(3 * NGHTTP2_FRAME_SETTINGS_ENTRY_LENGTH, NGHTTP2_SETTINGS,
                      NGHTTP2_FLAG_NONE, 0, &oframe.hd);
-  CU_ASSERT(3 == oframe.niv);
+  assert_size(3, ==, oframe.niv);
   for (i = 0; i < 3; ++i) {
-    CU_ASSERT(iv[i].settings_id == oframe.iv[i].settings_id);
-    CU_ASSERT(iv[i].value == oframe.iv[i].value);
+    assert_int32(iv[i].settings_id, ==, oframe.iv[i].settings_id);
+    assert_uint32(iv[i].value, ==, oframe.iv[i].value);
   }
 
   nghttp2_bufs_free(&bufs);
@@ -331,22 +353,23 @@ void test_nghttp2_frame_pack_push_promise(void) {
                                   (1U << 31) - 1, nva, nvlen);
   rv = nghttp2_frame_pack_push_promise(&bufs, &frame, &deflater);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(nghttp2_bufs_len(&bufs) > 0);
-  CU_ASSERT(0 == unpack_framebuf((nghttp2_frame *)&oframe, &bufs));
+  assert_int(0, ==, rv);
+  assert_size(0, <, nghttp2_bufs_len(&bufs));
+  assert_int(0, ==, unpack_framebuf((nghttp2_frame *)&oframe, &bufs));
 
   check_frame_header(nghttp2_bufs_len(&bufs) - NGHTTP2_FRAME_HDLEN,
                      NGHTTP2_PUSH_PROMISE, NGHTTP2_FLAG_END_HEADERS, 1000000007,
                      &oframe.hd);
-  CU_ASSERT((1U << 31) - 1 == oframe.promised_stream_id);
+  assert_int32((1U << 31) - 1, ==, oframe.promised_stream_id);
 
   hdblocklen = nghttp2_bufs_len(&bufs) - NGHTTP2_FRAME_HDLEN - 4;
-  CU_ASSERT((ssize_t)hdblocklen ==
-            inflate_hd(&inflater, &out, &bufs, NGHTTP2_FRAME_HDLEN + 4, mem));
+  assert_ptrdiff(
+      (nghttp2_ssize)hdblocklen, ==,
+      inflate_hd(&inflater, &out, &bufs, NGHTTP2_FRAME_HDLEN + 4, mem));
 
-  CU_ASSERT(7 == out.nvlen);
-  CU_ASSERT(nvnameeq("method", &out.nva[0]));
-  CU_ASSERT(nvvalueeq("GET", &out.nva[0]));
+  assert_size(7, ==, out.nvlen);
+  assert_true(nvnameeq("method", &out.nva[0]));
+  assert_true(nvvalueeq("GET", &out.nva[0]));
 
   nva_out_reset(&out, mem);
   nghttp2_bufs_free(&bufs);
@@ -366,11 +389,10 @@ void test_nghttp2_frame_pack_ping(void) {
   nghttp2_frame_ping_init(&frame, NGHTTP2_FLAG_ACK, opaque_data);
   nghttp2_frame_pack_ping(&bufs, &frame);
 
-  CU_ASSERT(NGHTTP2_FRAME_HDLEN + 8 == nghttp2_bufs_len(&bufs));
-  CU_ASSERT(0 == unpack_framebuf((nghttp2_frame *)&oframe, &bufs));
+  assert_size(NGHTTP2_FRAME_HDLEN + 8, ==, nghttp2_bufs_len(&bufs));
+  assert_int(0, ==, unpack_framebuf((nghttp2_frame *)&oframe, &bufs));
   check_frame_header(8, NGHTTP2_PING, NGHTTP2_FLAG_ACK, 0, &oframe.hd);
-  CU_ASSERT(memcmp(opaque_data, oframe.opaque_data, sizeof(opaque_data) - 1) ==
-            0);
+  assert_memory_equal(sizeof(opaque_data) - 1, opaque_data, oframe.opaque_data);
 
   nghttp2_bufs_free(&bufs);
   nghttp2_frame_ping_free(&oframe);
@@ -394,16 +416,16 @@ void test_nghttp2_frame_pack_goaway(void) {
                             opaque_data, opaque_data_len);
   rv = nghttp2_frame_pack_goaway(&bufs, &frame);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(NGHTTP2_FRAME_HDLEN + 8 + opaque_data_len ==
-            nghttp2_bufs_len(&bufs));
-  CU_ASSERT(0 == unpack_framebuf((nghttp2_frame *)&oframe, &bufs));
+  assert_int(0, ==, rv);
+  assert_size(NGHTTP2_FRAME_HDLEN + 8 + opaque_data_len, ==,
+              nghttp2_bufs_len(&bufs));
+  assert_int(0, ==, unpack_framebuf((nghttp2_frame *)&oframe, &bufs));
   check_frame_header(24, NGHTTP2_GOAWAY, NGHTTP2_FLAG_NONE, 0, &oframe.hd);
-  CU_ASSERT(1000000007 == oframe.last_stream_id);
-  CU_ASSERT(NGHTTP2_PROTOCOL_ERROR == oframe.error_code);
+  assert_int32(1000000007, ==, oframe.last_stream_id);
+  assert_uint32(NGHTTP2_PROTOCOL_ERROR, ==, oframe.error_code);
 
-  CU_ASSERT(opaque_data_len == oframe.opaque_data_len);
-  CU_ASSERT(memcmp(opaque_data, oframe.opaque_data, opaque_data_len) == 0);
+  assert_size(opaque_data_len, ==, oframe.opaque_data_len);
+  assert_memory_equal(opaque_data_len, opaque_data, oframe.opaque_data);
 
   nghttp2_frame_goaway_free(&oframe, mem);
   nghttp2_bufs_reset(&bufs);
@@ -413,10 +435,10 @@ void test_nghttp2_frame_pack_goaway(void) {
 
   rv = nghttp2_frame_pack_goaway(&bufs, &frame);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(0 == unpack_framebuf((nghttp2_frame *)&oframe, &bufs));
+  assert_int(0, ==, rv);
+  assert_int(0, ==, unpack_framebuf((nghttp2_frame *)&oframe, &bufs));
   check_frame_header(24, NGHTTP2_GOAWAY, NGHTTP2_FLAG_NONE, 0, &oframe.hd);
-  CU_ASSERT(1000000009 == oframe.error_code);
+  assert_uint32(1000000009, ==, oframe.error_code);
 
   nghttp2_frame_goaway_free(&oframe, mem);
 
@@ -434,11 +456,11 @@ void test_nghttp2_frame_pack_window_update(void) {
   nghttp2_frame_window_update_init(&frame, NGHTTP2_FLAG_NONE, 1000000007, 4096);
   nghttp2_frame_pack_window_update(&bufs, &frame);
 
-  CU_ASSERT(NGHTTP2_FRAME_HDLEN + 4 == nghttp2_bufs_len(&bufs));
-  CU_ASSERT(0 == unpack_framebuf((nghttp2_frame *)&oframe, &bufs));
+  assert_size(NGHTTP2_FRAME_HDLEN + 4, ==, nghttp2_bufs_len(&bufs));
+  assert_int(0, ==, unpack_framebuf((nghttp2_frame *)&oframe, &bufs));
   check_frame_header(4, NGHTTP2_WINDOW_UPDATE, NGHTTP2_FLAG_NONE, 1000000007,
                      &oframe.hd);
-  CU_ASSERT(4096 == oframe.window_size_increment);
+  assert_int32(4096, ==, oframe.window_size_increment);
 
   nghttp2_bufs_free(&bufs);
   nghttp2_frame_window_update_free(&oframe);
@@ -478,20 +500,20 @@ void test_nghttp2_frame_pack_altsvc(void) {
 
   nghttp2_frame_pack_altsvc(&bufs, &frame);
 
-  CU_ASSERT(NGHTTP2_FRAME_HDLEN + payloadlen == nghttp2_bufs_len(&bufs));
+  assert_size(NGHTTP2_FRAME_HDLEN + payloadlen, ==, nghttp2_bufs_len(&bufs));
 
   rv = unpack_framebuf((nghttp2_frame *)&oframe, &bufs);
 
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   check_frame_header(payloadlen, NGHTTP2_ALTSVC, NGHTTP2_FLAG_NONE, 1000000007,
                      &oframe.hd);
 
-  CU_ASSERT(sizeof(origin) - 1 == oaltsvc.origin_len);
-  CU_ASSERT(0 == memcmp(origin, oaltsvc.origin, sizeof(origin) - 1));
-  CU_ASSERT(sizeof(field_value) - 1 == oaltsvc.field_value_len);
-  CU_ASSERT(0 ==
-            memcmp(field_value, oaltsvc.field_value, sizeof(field_value) - 1));
+  assert_size(sizeof(origin) - 1, ==, oaltsvc.origin_len);
+  assert_memory_equal(sizeof(origin) - 1, origin, oaltsvc.origin);
+  assert_size(sizeof(field_value) - 1, ==, oaltsvc.field_value_len);
+  assert_memory_equal(sizeof(field_value) - 1, field_value,
+                      oaltsvc.field_value);
 
   nghttp2_frame_altsvc_free(&oframe, mem);
   nghttp2_frame_altsvc_free(&frame, mem);
@@ -536,21 +558,21 @@ void test_nghttp2_frame_pack_origin(void) {
 
   rv = nghttp2_frame_pack_origin(&bufs, &frame);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(NGHTTP2_FRAME_HDLEN + payloadlen == nghttp2_bufs_len(&bufs));
+  assert_int(0, ==, rv);
+  assert_size(NGHTTP2_FRAME_HDLEN + payloadlen, ==, nghttp2_bufs_len(&bufs));
 
   rv = unpack_framebuf((nghttp2_frame *)&oframe, &bufs);
 
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   check_frame_header(payloadlen, NGHTTP2_ORIGIN, NGHTTP2_FLAG_NONE, 0,
                      &oframe.hd);
 
-  CU_ASSERT(2 == oorigin.nov);
-  CU_ASSERT(sizeof(example) - 1 == oorigin.ov[0].origin_len);
-  CU_ASSERT(0 == memcmp(example, oorigin.ov[0].origin, sizeof(example) - 1));
-  CU_ASSERT(sizeof(nghttp2) - 1 == oorigin.ov[1].origin_len);
-  CU_ASSERT(0 == memcmp(nghttp2, oorigin.ov[1].origin, sizeof(nghttp2) - 1));
+  assert_size(2, ==, oorigin.nov);
+  assert_size(sizeof(example) - 1, ==, oorigin.ov[0].origin_len);
+  assert_memory_equal(sizeof(example) - 1, example, oorigin.ov[0].origin);
+  assert_size(sizeof(nghttp2) - 1, ==, oorigin.ov[1].origin_len);
+  assert_memory_equal(sizeof(nghttp2) - 1, nghttp2, oorigin.ov[1].origin);
 
   nghttp2_frame_origin_free(&oframe, mem);
 
@@ -561,7 +583,7 @@ void test_nghttp2_frame_pack_origin(void) {
 
   rv = unpack_framebuf((nghttp2_frame *)&oframe, &bufs);
 
-  CU_ASSERT(NGHTTP2_ERR_FRAME_SIZE_ERROR == rv);
+  assert_int(NGHTTP2_ERR_FRAME_SIZE_ERROR, ==, rv);
 
   nghttp2_bufs_reset(&bufs);
   memset(&oframe, 0, sizeof(oframe));
@@ -573,17 +595,17 @@ void test_nghttp2_frame_pack_origin(void) {
 
   rv = nghttp2_frame_pack_origin(&bufs, &frame);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(NGHTTP2_FRAME_HDLEN == nghttp2_bufs_len(&bufs));
+  assert_int(0, ==, rv);
+  assert_size(NGHTTP2_FRAME_HDLEN, ==, nghttp2_bufs_len(&bufs));
 
   rv = unpack_framebuf((nghttp2_frame *)&oframe, &bufs);
 
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   check_frame_header(0, NGHTTP2_ORIGIN, NGHTTP2_FLAG_NONE, 0, &oframe.hd);
 
-  CU_ASSERT(0 == oorigin.nov);
-  CU_ASSERT(NULL == oorigin.ov);
+  assert_size(0, ==, oorigin.nov);
+  assert_null(oorigin.ov);
 
   nghttp2_frame_origin_free(&oframe, mem);
 
@@ -610,25 +632,25 @@ void test_nghttp2_frame_pack_priority_update(void) {
 
   nghttp2_frame_pack_priority_update(&bufs, &frame);
 
-  CU_ASSERT(NGHTTP2_FRAME_HDLEN + payloadlen == nghttp2_bufs_len(&bufs));
+  assert_size(NGHTTP2_FRAME_HDLEN + payloadlen, ==, nghttp2_bufs_len(&bufs));
 
   rv = unpack_framebuf((nghttp2_frame *)&oframe, &bufs);
 
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   check_frame_header(payloadlen, NGHTTP2_PRIORITY_UPDATE, NGHTTP2_FLAG_NONE, 0,
                      &oframe.hd);
 
-  CU_ASSERT(sizeof(field_value) - 1 == opriority_update.field_value_len);
-  CU_ASSERT(0 == memcmp(field_value, opriority_update.field_value,
-                        sizeof(field_value) - 1));
+  assert_size(sizeof(field_value) - 1, ==, opriority_update.field_value_len);
+  assert_memory_equal(sizeof(field_value) - 1, field_value,
+                      opriority_update.field_value);
 
   nghttp2_bufs_free(&bufs);
 }
 
 void test_nghttp2_nv_array_copy(void) {
   nghttp2_nv *nva;
-  ssize_t rv;
+  int rv;
   nghttp2_nv emptynv[] = {MAKE_NV("", ""), MAKE_NV("", "")};
   nghttp2_nv nv[] = {MAKE_NV("alpha", "bravo"), MAKE_NV("charlie", "delta")};
   nghttp2_nv bignv;
@@ -644,34 +666,34 @@ void test_nghttp2_nv_array_copy(void) {
   memset(bignv.value, '0', bignv.valuelen);
 
   rv = nghttp2_nv_array_copy(&nva, NULL, 0, mem);
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(NULL == nva);
+  assert_int(0, ==, rv);
+  assert_null(nva);
 
   rv = nghttp2_nv_array_copy(&nva, emptynv, ARRLEN(emptynv), mem);
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(nva[0].namelen == 0);
-  CU_ASSERT(nva[0].valuelen == 0);
-  CU_ASSERT(nva[1].namelen == 0);
-  CU_ASSERT(nva[1].valuelen == 0);
+  assert_int(0, ==, rv);
+  assert_size(0, ==, nva[0].namelen);
+  assert_size(0, ==, nva[0].valuelen);
+  assert_size(0, ==, nva[1].namelen);
+  assert_size(0, ==, nva[1].valuelen);
 
   nghttp2_nv_array_del(nva, mem);
 
   rv = nghttp2_nv_array_copy(&nva, nv, ARRLEN(nv), mem);
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(nva[0].namelen == 5);
-  CU_ASSERT(0 == memcmp("alpha", nva[0].name, 5));
-  CU_ASSERT(nva[0].valuelen == 5);
-  CU_ASSERT(0 == memcmp("bravo", nva[0].value, 5));
-  CU_ASSERT(nva[1].namelen == 7);
-  CU_ASSERT(0 == memcmp("charlie", nva[1].name, 7));
-  CU_ASSERT(nva[1].valuelen == 5);
-  CU_ASSERT(0 == memcmp("delta", nva[1].value, 5));
+  assert_int(0, ==, rv);
+  assert_size(5, ==, nva[0].namelen);
+  assert_memory_equal(5, "alpha", nva[0].name);
+  assert_size(5, ==, nva[0].valuelen);
+  assert_memory_equal(5, "bravo", nva[0].value);
+  assert_size(7, ==, nva[1].namelen);
+  assert_memory_equal(7, "charlie", nva[1].name);
+  assert_size(5, ==, nva[1].valuelen);
+  assert_memory_equal(5, "delta", nva[1].value);
 
   nghttp2_nv_array_del(nva, mem);
 
   /* Large header field is acceptable */
   rv = nghttp2_nv_array_copy(&nva, &bignv, 1, mem);
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   nghttp2_nv_array_del(nva, mem);
 
@@ -686,50 +708,50 @@ void test_nghttp2_iv_check(void) {
   iv[1].settings_id = NGHTTP2_SETTINGS_HEADER_TABLE_SIZE;
   iv[1].value = 1024;
 
-  CU_ASSERT(nghttp2_iv_check(iv, 2));
+  assert_true(nghttp2_iv_check(iv, 2));
 
   iv[1].settings_id = NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE;
   iv[1].value = NGHTTP2_MAX_WINDOW_SIZE;
-  CU_ASSERT(nghttp2_iv_check(iv, 2));
+  assert_true(nghttp2_iv_check(iv, 2));
 
   /* Too large window size */
   iv[1].value = (uint32_t)NGHTTP2_MAX_WINDOW_SIZE + 1;
-  CU_ASSERT(0 == nghttp2_iv_check(iv, 2));
+  assert_false(nghttp2_iv_check(iv, 2));
 
   /* ENABLE_PUSH only allows 0 or 1 */
   iv[1].settings_id = NGHTTP2_SETTINGS_ENABLE_PUSH;
   iv[1].value = 0;
-  CU_ASSERT(nghttp2_iv_check(iv, 2));
+  assert_true(nghttp2_iv_check(iv, 2));
   iv[1].value = 1;
-  CU_ASSERT(nghttp2_iv_check(iv, 2));
+  assert_true(nghttp2_iv_check(iv, 2));
   iv[1].value = 3;
-  CU_ASSERT(!nghttp2_iv_check(iv, 2));
+  assert_false(nghttp2_iv_check(iv, 2));
 
   /* Undefined SETTINGS ID is allowed */
   iv[1].settings_id = 1000000009;
   iv[1].value = 0;
-  CU_ASSERT(nghttp2_iv_check(iv, 2));
+  assert_true(nghttp2_iv_check(iv, 2));
 
   /* Full size SETTINGS_HEADER_TABLE_SIZE (UINT32_MAX) must be
      accepted */
   iv[1].settings_id = NGHTTP2_SETTINGS_HEADER_TABLE_SIZE;
   iv[1].value = UINT32_MAX;
-  CU_ASSERT(nghttp2_iv_check(iv, 2));
+  assert_true(nghttp2_iv_check(iv, 2));
 
   /* Too small SETTINGS_MAX_FRAME_SIZE */
   iv[0].settings_id = NGHTTP2_SETTINGS_MAX_FRAME_SIZE;
   iv[0].value = NGHTTP2_MAX_FRAME_SIZE_MIN - 1;
-  CU_ASSERT(!nghttp2_iv_check(iv, 1));
+  assert_false(nghttp2_iv_check(iv, 1));
 
   /* Too large SETTINGS_MAX_FRAME_SIZE */
   iv[0].settings_id = NGHTTP2_SETTINGS_MAX_FRAME_SIZE;
   iv[0].value = NGHTTP2_MAX_FRAME_SIZE_MAX + 1;
-  CU_ASSERT(!nghttp2_iv_check(iv, 1));
+  assert_false(nghttp2_iv_check(iv, 1));
 
   /* Max and min SETTINGS_MAX_FRAME_SIZE */
   iv[0].settings_id = NGHTTP2_SETTINGS_MAX_FRAME_SIZE;
   iv[0].value = NGHTTP2_MAX_FRAME_SIZE_MIN;
   iv[1].settings_id = NGHTTP2_SETTINGS_MAX_FRAME_SIZE;
   iv[1].value = NGHTTP2_MAX_FRAME_SIZE_MAX;
-  CU_ASSERT(nghttp2_iv_check(iv, 2));
+  assert_true(nghttp2_iv_check(iv, 2));
 }
diff --git a/tests/nghttp2_frame_test.h b/tests/nghttp2_frame_test.h
index dc07625..ae7842c 100644
--- a/tests/nghttp2_frame_test.h
+++ b/tests/nghttp2_frame_test.h
@@ -29,19 +29,25 @@
 #  include <config.h>
 #endif /* HAVE_CONFIG_H */
 
-void test_nghttp2_frame_pack_headers(void);
-void test_nghttp2_frame_pack_headers_frame_too_large(void);
-void test_nghttp2_frame_pack_priority(void);
-void test_nghttp2_frame_pack_rst_stream(void);
-void test_nghttp2_frame_pack_settings(void);
-void test_nghttp2_frame_pack_push_promise(void);
-void test_nghttp2_frame_pack_ping(void);
-void test_nghttp2_frame_pack_goaway(void);
-void test_nghttp2_frame_pack_window_update(void);
-void test_nghttp2_frame_pack_altsvc(void);
-void test_nghttp2_frame_pack_origin(void);
-void test_nghttp2_frame_pack_priority_update(void);
-void test_nghttp2_nv_array_copy(void);
-void test_nghttp2_iv_check(void);
+#define MUNIT_ENABLE_ASSERT_ALIASES
+
+#include "munit.h"
+
+extern const MunitSuite frame_suite;
+
+munit_void_test_decl(test_nghttp2_frame_pack_headers);
+munit_void_test_decl(test_nghttp2_frame_pack_headers_frame_too_large);
+munit_void_test_decl(test_nghttp2_frame_pack_priority);
+munit_void_test_decl(test_nghttp2_frame_pack_rst_stream);
+munit_void_test_decl(test_nghttp2_frame_pack_settings);
+munit_void_test_decl(test_nghttp2_frame_pack_push_promise);
+munit_void_test_decl(test_nghttp2_frame_pack_ping);
+munit_void_test_decl(test_nghttp2_frame_pack_goaway);
+munit_void_test_decl(test_nghttp2_frame_pack_window_update);
+munit_void_test_decl(test_nghttp2_frame_pack_altsvc);
+munit_void_test_decl(test_nghttp2_frame_pack_origin);
+munit_void_test_decl(test_nghttp2_frame_pack_priority_update);
+munit_void_test_decl(test_nghttp2_nv_array_copy);
+munit_void_test_decl(test_nghttp2_iv_check);
 
 #endif /* NGHTTP2_FRAME_TEST_H */
diff --git a/tests/nghttp2_hd_test.c b/tests/nghttp2_hd_test.c
index 657d895..d57127f 100644
--- a/tests/nghttp2_hd_test.c
+++ b/tests/nghttp2_hd_test.c
@@ -27,11 +27,42 @@
 #include <stdio.h>
 #include <assert.h>
 
-#include <CUnit/CUnit.h>
+#include "munit.h"
 
 #include "nghttp2_hd.h"
 #include "nghttp2_frame.h"
 #include "nghttp2_test_helper.h"
+#include "nghttp2_assertion.h"
+
+static const MunitTest tests[] = {
+    munit_void_test(test_nghttp2_hd_deflate),
+    munit_void_test(test_nghttp2_hd_deflate_same_indexed_repr),
+    munit_void_test(test_nghttp2_hd_inflate_indexed),
+    munit_void_test(test_nghttp2_hd_inflate_indname_noinc),
+    munit_void_test(test_nghttp2_hd_inflate_indname_inc),
+    munit_void_test(test_nghttp2_hd_inflate_indname_inc_eviction),
+    munit_void_test(test_nghttp2_hd_inflate_newname_noinc),
+    munit_void_test(test_nghttp2_hd_inflate_newname_inc),
+    munit_void_test(test_nghttp2_hd_inflate_clearall_inc),
+    munit_void_test(test_nghttp2_hd_inflate_zero_length_huffman),
+    munit_void_test(test_nghttp2_hd_inflate_expect_table_size_update),
+    munit_void_test(test_nghttp2_hd_inflate_unexpected_table_size_update),
+    munit_void_test(test_nghttp2_hd_ringbuf_reserve),
+    munit_void_test(test_nghttp2_hd_change_table_size),
+    munit_void_test(test_nghttp2_hd_deflate_inflate),
+    munit_void_test(test_nghttp2_hd_no_index),
+    munit_void_test(test_nghttp2_hd_deflate_bound),
+    munit_void_test(test_nghttp2_hd_public_api),
+    munit_void_test(test_nghttp2_hd_deflate_hd_vec),
+    munit_void_test(test_nghttp2_hd_decode_length),
+    munit_void_test(test_nghttp2_hd_huff_encode),
+    munit_void_test(test_nghttp2_hd_huff_decode),
+    munit_test_end(),
+};
+
+const MunitSuite hd_suite = {
+    "/hd", tests, NULL, 1, MUNIT_SUITE_OPTION_NONE,
+};
 
 void test_nghttp2_hd_deflate(void) {
   nghttp2_hd_deflater deflater;
@@ -47,7 +78,7 @@ void test_nghttp2_hd_deflate(void) {
   nghttp2_nv nva5[] = {MAKE_NV(":path", "/style.css"),
                        MAKE_NV("x-nghttp2", "")};
   nghttp2_bufs bufs;
-  ssize_t blocklen;
+  nghttp2_ssize blocklen;
   nva_out out;
   int rv;
   nghttp2_mem *mem;
@@ -56,17 +87,17 @@ void test_nghttp2_hd_deflate(void) {
   frame_pack_bufs_init(&bufs);
 
   nva_out_init(&out);
-  CU_ASSERT(0 == nghttp2_hd_deflate_init(&deflater, mem));
-  CU_ASSERT(0 == nghttp2_hd_inflate_init(&inflater, mem));
+  assert_int(0, ==, nghttp2_hd_deflate_init(&deflater, mem));
+  assert_int(0, ==, nghttp2_hd_inflate_init(&inflater, mem));
 
   rv = nghttp2_hd_deflate_hd_bufs(&deflater, &bufs, nva1, ARRLEN(nva1));
-  blocklen = (ssize_t)nghttp2_bufs_len(&bufs);
+  blocklen = (nghttp2_ssize)nghttp2_bufs_len(&bufs);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(blocklen > 0);
-  CU_ASSERT(blocklen == inflate_hd(&inflater, &out, &bufs, 0, mem));
+  assert_int(0, ==, rv);
+  assert_ptrdiff(0, <, blocklen);
+  assert_ptrdiff(blocklen, ==, inflate_hd(&inflater, &out, &bufs, 0, mem));
 
-  CU_ASSERT(3 == out.nvlen);
+  assert_size(3, ==, out.nvlen);
   assert_nv_equal(nva1, out.nva, 3, mem);
 
   nva_out_reset(&out, mem);
@@ -74,13 +105,13 @@ void test_nghttp2_hd_deflate(void) {
 
   /* Second headers */
   rv = nghttp2_hd_deflate_hd_bufs(&deflater, &bufs, nva2, ARRLEN(nva2));
-  blocklen = (ssize_t)nghttp2_bufs_len(&bufs);
+  blocklen = (nghttp2_ssize)nghttp2_bufs_len(&bufs);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(blocklen > 0);
-  CU_ASSERT(blocklen == inflate_hd(&inflater, &out, &bufs, 0, mem));
+  assert_int(0, ==, rv);
+  assert_ptrdiff(0, <, blocklen);
+  assert_ptrdiff(blocklen, ==, inflate_hd(&inflater, &out, &bufs, 0, mem));
 
-  CU_ASSERT(2 == out.nvlen);
+  assert_size(2, ==, out.nvlen);
   assert_nv_equal(nva2, out.nva, 2, mem);
 
   nva_out_reset(&out, mem);
@@ -89,13 +120,13 @@ void test_nghttp2_hd_deflate(void) {
   /* Third headers, including same header field name, but value is not
      the same. */
   rv = nghttp2_hd_deflate_hd_bufs(&deflater, &bufs, nva3, ARRLEN(nva3));
-  blocklen = (ssize_t)nghttp2_bufs_len(&bufs);
+  blocklen = (nghttp2_ssize)nghttp2_bufs_len(&bufs);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(blocklen > 0);
-  CU_ASSERT(blocklen == inflate_hd(&inflater, &out, &bufs, 0, mem));
+  assert_int(0, ==, rv);
+  assert_ptrdiff(0, <, blocklen);
+  assert_ptrdiff(blocklen, ==, inflate_hd(&inflater, &out, &bufs, 0, mem));
 
-  CU_ASSERT(3 == out.nvlen);
+  assert_size(3, ==, out.nvlen);
   assert_nv_equal(nva3, out.nva, 3, mem);
 
   nva_out_reset(&out, mem);
@@ -103,13 +134,13 @@ void test_nghttp2_hd_deflate(void) {
 
   /* Fourth headers, including duplicate header fields. */
   rv = nghttp2_hd_deflate_hd_bufs(&deflater, &bufs, nva4, ARRLEN(nva4));
-  blocklen = (ssize_t)nghttp2_bufs_len(&bufs);
+  blocklen = (nghttp2_ssize)nghttp2_bufs_len(&bufs);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(blocklen > 0);
-  CU_ASSERT(blocklen == inflate_hd(&inflater, &out, &bufs, 0, mem));
+  assert_int(0, ==, rv);
+  assert_ptrdiff(0, <, blocklen);
+  assert_ptrdiff(blocklen, ==, inflate_hd(&inflater, &out, &bufs, 0, mem));
 
-  CU_ASSERT(3 == out.nvlen);
+  assert_size(3, ==, out.nvlen);
   assert_nv_equal(nva4, out.nva, 3, mem);
 
   nva_out_reset(&out, mem);
@@ -117,13 +148,13 @@ void test_nghttp2_hd_deflate(void) {
 
   /* Fifth headers includes empty value */
   rv = nghttp2_hd_deflate_hd_bufs(&deflater, &bufs, nva5, ARRLEN(nva5));
-  blocklen = (ssize_t)nghttp2_bufs_len(&bufs);
+  blocklen = (nghttp2_ssize)nghttp2_bufs_len(&bufs);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(blocklen > 0);
-  CU_ASSERT(blocklen == inflate_hd(&inflater, &out, &bufs, 0, mem));
+  assert_int(0, ==, rv);
+  assert_ptrdiff(0, <, blocklen);
+  assert_ptrdiff(blocklen, ==, inflate_hd(&inflater, &out, &bufs, 0, mem));
 
-  CU_ASSERT(2 == out.nvlen);
+  assert_size(2, ==, out.nvlen);
   assert_nv_equal(nva5, out.nva, 2, mem);
 
   nva_out_reset(&out, mem);
@@ -142,7 +173,7 @@ void test_nghttp2_hd_deflate_same_indexed_repr(void) {
   nghttp2_nv nva2[] = {MAKE_NV("host", "alpha"), MAKE_NV("host", "alpha"),
                        MAKE_NV("host", "alpha")};
   nghttp2_bufs bufs;
-  ssize_t blocklen;
+  nghttp2_ssize blocklen;
   nva_out out;
   int rv;
   nghttp2_mem *mem;
@@ -151,18 +182,18 @@ void test_nghttp2_hd_deflate_same_indexed_repr(void) {
   frame_pack_bufs_init(&bufs);
 
   nva_out_init(&out);
-  CU_ASSERT(0 == nghttp2_hd_deflate_init(&deflater, mem));
-  CU_ASSERT(0 == nghttp2_hd_inflate_init(&inflater, mem));
+  assert_int(0, ==, nghttp2_hd_deflate_init(&deflater, mem));
+  assert_int(0, ==, nghttp2_hd_inflate_init(&inflater, mem));
 
   /* Encode 2 same headers.  Emit 1 literal reprs and 1 index repr. */
   rv = nghttp2_hd_deflate_hd_bufs(&deflater, &bufs, nva1, ARRLEN(nva1));
-  blocklen = (ssize_t)nghttp2_bufs_len(&bufs);
+  blocklen = (nghttp2_ssize)nghttp2_bufs_len(&bufs);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(blocklen > 0);
-  CU_ASSERT(blocklen == inflate_hd(&inflater, &out, &bufs, 0, mem));
+  assert_int(0, ==, rv);
+  assert_ptrdiff(0, <, blocklen);
+  assert_ptrdiff(blocklen, ==, inflate_hd(&inflater, &out, &bufs, 0, mem));
 
-  CU_ASSERT(2 == out.nvlen);
+  assert_size(2, ==, out.nvlen);
   assert_nv_equal(nva1, out.nva, 2, mem);
 
   nva_out_reset(&out, mem);
@@ -170,13 +201,13 @@ void test_nghttp2_hd_deflate_same_indexed_repr(void) {
 
   /* Encode 3 same headers.  This time, emits 3 index reprs. */
   rv = nghttp2_hd_deflate_hd_bufs(&deflater, &bufs, nva2, ARRLEN(nva2));
-  blocklen = (ssize_t)nghttp2_bufs_len(&bufs);
+  blocklen = (nghttp2_ssize)nghttp2_bufs_len(&bufs);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(blocklen == 3);
-  CU_ASSERT(blocklen == inflate_hd(&inflater, &out, &bufs, 0, mem));
+  assert_int(0, ==, rv);
+  assert_ptrdiff(3, ==, blocklen);
+  assert_ptrdiff(blocklen, ==, inflate_hd(&inflater, &out, &bufs, 0, mem));
 
-  CU_ASSERT(3 == out.nvlen);
+  assert_size(3, ==, out.nvlen);
   assert_nv_equal(nva2, out.nva, 3, mem);
 
   nva_out_reset(&out, mem);
@@ -191,7 +222,7 @@ void test_nghttp2_hd_deflate_same_indexed_repr(void) {
 void test_nghttp2_hd_inflate_indexed(void) {
   nghttp2_hd_inflater inflater;
   nghttp2_bufs bufs;
-  ssize_t blocklen;
+  nghttp2_ssize blocklen;
   nghttp2_nv nv = MAKE_NV(":path", "/");
   nva_out out;
   nghttp2_mem *mem;
@@ -204,12 +235,12 @@ void test_nghttp2_hd_inflate_indexed(void) {
 
   nghttp2_bufs_addb(&bufs, (1 << 7) | 4);
 
-  blocklen = (ssize_t)nghttp2_bufs_len(&bufs);
+  blocklen = (nghttp2_ssize)nghttp2_bufs_len(&bufs);
 
-  CU_ASSERT(1 == blocklen);
-  CU_ASSERT(blocklen == inflate_hd(&inflater, &out, &bufs, 0, mem));
+  assert_ptrdiff(1, ==, blocklen);
+  assert_ptrdiff(blocklen, ==, inflate_hd(&inflater, &out, &bufs, 0, mem));
 
-  CU_ASSERT(1 == out.nvlen);
+  assert_size(1, ==, out.nvlen);
 
   assert_nv_equal(&nv, out.nva, 1, mem);
 
@@ -219,11 +250,11 @@ void test_nghttp2_hd_inflate_indexed(void) {
   /* index = 0 is error */
   nghttp2_bufs_addb(&bufs, 1 << 7);
 
-  blocklen = (ssize_t)nghttp2_bufs_len(&bufs);
+  blocklen = (nghttp2_ssize)nghttp2_bufs_len(&bufs);
 
-  CU_ASSERT(1 == blocklen);
-  CU_ASSERT(NGHTTP2_ERR_HEADER_COMP ==
-            inflate_hd(&inflater, &out, &bufs, 0, mem));
+  assert_ptrdiff(1, ==, blocklen);
+  assert_ptrdiff(NGHTTP2_ERR_HEADER_COMP, ==,
+                 inflate_hd(&inflater, &out, &bufs, 0, mem));
 
   nghttp2_bufs_free(&bufs);
   nghttp2_hd_inflate_free(&inflater);
@@ -232,7 +263,7 @@ void test_nghttp2_hd_inflate_indexed(void) {
 void test_nghttp2_hd_inflate_indname_noinc(void) {
   nghttp2_hd_inflater inflater;
   nghttp2_bufs bufs;
-  ssize_t blocklen;
+  nghttp2_ssize blocklen;
   nghttp2_nv nv[] = {/* Huffman */
                      MAKE_NV("user-agent", "nghttp2"),
                      /* Expecting no huffman */
@@ -248,18 +279,19 @@ void test_nghttp2_hd_inflate_indname_noinc(void) {
   nghttp2_hd_inflate_init(&inflater, mem);
 
   for (i = 0; i < ARRLEN(nv); ++i) {
-    CU_ASSERT(0 == nghttp2_hd_emit_indname_block(&bufs, 57, &nv[i],
-                                                 NGHTTP2_HD_WITHOUT_INDEXING));
+    assert_int(0, ==,
+               nghttp2_hd_emit_indname_block(&bufs, 57, &nv[i],
+                                             NGHTTP2_HD_WITHOUT_INDEXING));
 
-    blocklen = (ssize_t)nghttp2_bufs_len(&bufs);
+    blocklen = (nghttp2_ssize)nghttp2_bufs_len(&bufs);
 
-    CU_ASSERT(blocklen > 0);
-    CU_ASSERT(blocklen == inflate_hd(&inflater, &out, &bufs, 0, mem));
+    assert_ptrdiff(0, <, blocklen);
+    assert_ptrdiff(blocklen, ==, inflate_hd(&inflater, &out, &bufs, 0, mem));
 
-    CU_ASSERT(1 == out.nvlen);
+    assert_size(1, ==, out.nvlen);
     assert_nv_equal(&nv[i], out.nva, 1, mem);
-    CU_ASSERT(0 == inflater.ctx.hd_table.len);
-    CU_ASSERT(61 == nghttp2_hd_inflate_get_num_table_entries(&inflater));
+    assert_size(0, ==, inflater.ctx.hd_table.len);
+    assert_size(61, ==, nghttp2_hd_inflate_get_num_table_entries(&inflater));
 
     nva_out_reset(&out, mem);
     nghttp2_bufs_reset(&bufs);
@@ -272,7 +304,7 @@ void test_nghttp2_hd_inflate_indname_noinc(void) {
 void test_nghttp2_hd_inflate_indname_inc(void) {
   nghttp2_hd_inflater inflater;
   nghttp2_bufs bufs;
-  ssize_t blocklen;
+  nghttp2_ssize blocklen;
   nghttp2_nv nv = MAKE_NV("user-agent", "nghttp2");
   nva_out out;
   nghttp2_mem *mem;
@@ -283,18 +315,19 @@ void test_nghttp2_hd_inflate_indname_inc(void) {
   nva_out_init(&out);
   nghttp2_hd_inflate_init(&inflater, mem);
 
-  CU_ASSERT(0 == nghttp2_hd_emit_indname_block(&bufs, 57, &nv,
-                                               NGHTTP2_HD_WITH_INDEXING));
+  assert_int(
+      0, ==,
+      nghttp2_hd_emit_indname_block(&bufs, 57, &nv, NGHTTP2_HD_WITH_INDEXING));
 
-  blocklen = (ssize_t)nghttp2_bufs_len(&bufs);
+  blocklen = (nghttp2_ssize)nghttp2_bufs_len(&bufs);
 
-  CU_ASSERT(blocklen > 0);
-  CU_ASSERT(blocklen == inflate_hd(&inflater, &out, &bufs, 0, mem));
+  assert_ptrdiff(0, <, blocklen);
+  assert_ptrdiff(blocklen, ==, inflate_hd(&inflater, &out, &bufs, 0, mem));
 
-  CU_ASSERT(1 == out.nvlen);
+  assert_size(1, ==, out.nvlen);
   assert_nv_equal(&nv, out.nva, 1, mem);
-  CU_ASSERT(1 == inflater.ctx.hd_table.len);
-  CU_ASSERT(62 == nghttp2_hd_inflate_get_num_table_entries(&inflater));
+  assert_size(1, ==, inflater.ctx.hd_table.len);
+  assert_size(62, ==, nghttp2_hd_inflate_get_num_table_entries(&inflater));
   assert_nv_equal(
       &nv,
       nghttp2_hd_inflate_get_table_entry(
@@ -309,7 +342,7 @@ void test_nghttp2_hd_inflate_indname_inc(void) {
 void test_nghttp2_hd_inflate_indname_inc_eviction(void) {
   nghttp2_hd_inflater inflater;
   nghttp2_bufs bufs;
-  ssize_t blocklen;
+  nghttp2_ssize blocklen;
   uint8_t value[1025];
   nva_out out;
   nghttp2_nv nv;
@@ -328,31 +361,35 @@ void test_nghttp2_hd_inflate_indname_inc_eviction(void) {
 
   nv.flags = NGHTTP2_NV_FLAG_NONE;
 
-  CU_ASSERT(0 == nghttp2_hd_emit_indname_block(&bufs, 14, &nv,
-                                               NGHTTP2_HD_WITH_INDEXING));
-  CU_ASSERT(0 == nghttp2_hd_emit_indname_block(&bufs, 15, &nv,
-                                               NGHTTP2_HD_WITH_INDEXING));
-  CU_ASSERT(0 == nghttp2_hd_emit_indname_block(&bufs, 16, &nv,
-                                               NGHTTP2_HD_WITH_INDEXING));
-  CU_ASSERT(0 == nghttp2_hd_emit_indname_block(&bufs, 17, &nv,
-                                               NGHTTP2_HD_WITH_INDEXING));
+  assert_int(
+      0, ==,
+      nghttp2_hd_emit_indname_block(&bufs, 14, &nv, NGHTTP2_HD_WITH_INDEXING));
+  assert_int(
+      0, ==,
+      nghttp2_hd_emit_indname_block(&bufs, 15, &nv, NGHTTP2_HD_WITH_INDEXING));
+  assert_int(
+      0, ==,
+      nghttp2_hd_emit_indname_block(&bufs, 16, &nv, NGHTTP2_HD_WITH_INDEXING));
+  assert_int(
+      0, ==,
+      nghttp2_hd_emit_indname_block(&bufs, 17, &nv, NGHTTP2_HD_WITH_INDEXING));
 
-  blocklen = (ssize_t)nghttp2_bufs_len(&bufs);
+  blocklen = (nghttp2_ssize)nghttp2_bufs_len(&bufs);
 
-  CU_ASSERT(blocklen > 0);
+  assert_ptrdiff(0, <, blocklen);
 
-  CU_ASSERT(blocklen == inflate_hd(&inflater, &out, &bufs, 0, mem));
+  assert_ptrdiff(blocklen, ==, inflate_hd(&inflater, &out, &bufs, 0, mem));
 
-  CU_ASSERT(4 == out.nvlen);
-  CU_ASSERT(14 == out.nva[0].namelen);
-  CU_ASSERT(0 == memcmp("accept-charset", out.nva[0].name, out.nva[0].namelen));
-  CU_ASSERT(sizeof(value) - 1 == out.nva[0].valuelen);
+  assert_size(4, ==, out.nvlen);
+  assert_size(14, ==, out.nva[0].namelen);
+  assert_memory_equal(out.nva[0].namelen, "accept-charset", out.nva[0].name);
+  assert_size(sizeof(value) - 1, ==, out.nva[0].valuelen);
 
   nva_out_reset(&out, mem);
   nghttp2_bufs_reset(&bufs);
 
-  CU_ASSERT(3 == inflater.ctx.hd_table.len);
-  CU_ASSERT(64 == nghttp2_hd_inflate_get_num_table_entries(&inflater));
+  assert_size(3, ==, inflater.ctx.hd_table.len);
+  assert_size(64, ==, nghttp2_hd_inflate_get_num_table_entries(&inflater));
 
   nghttp2_bufs_free(&bufs);
   nghttp2_hd_inflate_free(&inflater);
@@ -361,7 +398,7 @@ void test_nghttp2_hd_inflate_indname_inc_eviction(void) {
 void test_nghttp2_hd_inflate_newname_noinc(void) {
   nghttp2_hd_inflater inflater;
   nghttp2_bufs bufs;
-  ssize_t blocklen;
+  nghttp2_ssize blocklen;
   nghttp2_nv nv[] = {/* Expecting huffman for both */
                      MAKE_NV("my-long-content-length", "nghttp2"),
                      /* Expecting no huffman for both */
@@ -380,17 +417,18 @@ void test_nghttp2_hd_inflate_newname_noinc(void) {
   nva_out_init(&out);
   nghttp2_hd_inflate_init(&inflater, mem);
   for (i = 0; i < ARRLEN(nv); ++i) {
-    CU_ASSERT(0 == nghttp2_hd_emit_newname_block(&bufs, &nv[i],
-                                                 NGHTTP2_HD_WITHOUT_INDEXING));
+    assert_int(0, ==,
+               nghttp2_hd_emit_newname_block(&bufs, &nv[i],
+                                             NGHTTP2_HD_WITHOUT_INDEXING));
 
-    blocklen = (ssize_t)nghttp2_bufs_len(&bufs);
+    blocklen = (nghttp2_ssize)nghttp2_bufs_len(&bufs);
 
-    CU_ASSERT(blocklen > 0);
-    CU_ASSERT(blocklen == inflate_hd(&inflater, &out, &bufs, 0, mem));
+    assert_ptrdiff(0, <, blocklen);
+    assert_ptrdiff(blocklen, ==, inflate_hd(&inflater, &out, &bufs, 0, mem));
 
-    CU_ASSERT(1 == out.nvlen);
+    assert_size(1, ==, out.nvlen);
     assert_nv_equal(&nv[i], out.nva, 1, mem);
-    CU_ASSERT(0 == inflater.ctx.hd_table.len);
+    assert_size(0, ==, inflater.ctx.hd_table.len);
 
     nva_out_reset(&out, mem);
     nghttp2_bufs_reset(&bufs);
@@ -403,7 +441,7 @@ void test_nghttp2_hd_inflate_newname_noinc(void) {
 void test_nghttp2_hd_inflate_newname_inc(void) {
   nghttp2_hd_inflater inflater;
   nghttp2_bufs bufs;
-  ssize_t blocklen;
+  nghttp2_ssize blocklen;
   nghttp2_nv nv = MAKE_NV("x-rel", "nghttp2");
   nva_out out;
   nghttp2_mem *mem;
@@ -414,17 +452,18 @@ void test_nghttp2_hd_inflate_newname_inc(void) {
   nva_out_init(&out);
   nghttp2_hd_inflate_init(&inflater, mem);
 
-  CU_ASSERT(
-      0 == nghttp2_hd_emit_newname_block(&bufs, &nv, NGHTTP2_HD_WITH_INDEXING));
+  assert_int(
+      0, ==,
+      nghttp2_hd_emit_newname_block(&bufs, &nv, NGHTTP2_HD_WITH_INDEXING));
 
-  blocklen = (ssize_t)nghttp2_bufs_len(&bufs);
+  blocklen = (nghttp2_ssize)nghttp2_bufs_len(&bufs);
 
-  CU_ASSERT(blocklen > 0);
-  CU_ASSERT(blocklen == inflate_hd(&inflater, &out, &bufs, 0, mem));
+  assert_ptrdiff(0, <, blocklen);
+  assert_ptrdiff(blocklen, ==, inflate_hd(&inflater, &out, &bufs, 0, mem));
 
-  CU_ASSERT(1 == out.nvlen);
+  assert_size(1, ==, out.nvlen);
   assert_nv_equal(&nv, out.nva, 1, mem);
-  CU_ASSERT(1 == inflater.ctx.hd_table.len);
+  assert_size(1, ==, inflater.ctx.hd_table.len);
   assert_nv_equal(
       &nv,
       nghttp2_hd_inflate_get_table_entry(
@@ -439,7 +478,7 @@ void test_nghttp2_hd_inflate_newname_inc(void) {
 void test_nghttp2_hd_inflate_clearall_inc(void) {
   nghttp2_hd_inflater inflater;
   nghttp2_bufs bufs;
-  ssize_t blocklen;
+  nghttp2_ssize blocklen;
   nghttp2_nv nv;
   uint8_t value[4061];
   nva_out out;
@@ -461,26 +500,27 @@ void test_nghttp2_hd_inflate_clearall_inc(void) {
 
   nghttp2_hd_inflate_init(&inflater, mem);
 
-  CU_ASSERT(
-      0 == nghttp2_hd_emit_newname_block(&bufs, &nv, NGHTTP2_HD_WITH_INDEXING));
+  assert_int(
+      0, ==,
+      nghttp2_hd_emit_newname_block(&bufs, &nv, NGHTTP2_HD_WITH_INDEXING));
 
-  blocklen = (ssize_t)nghttp2_bufs_len(&bufs);
+  blocklen = (nghttp2_ssize)nghttp2_bufs_len(&bufs);
 
-  CU_ASSERT(blocklen > 0);
-  CU_ASSERT(blocklen == inflate_hd(&inflater, &out, &bufs, 0, mem));
+  assert_ptrdiff(0, <, blocklen);
+  assert_ptrdiff(blocklen, ==, inflate_hd(&inflater, &out, &bufs, 0, mem));
 
-  CU_ASSERT(1 == out.nvlen);
+  assert_size(1, ==, out.nvlen);
   assert_nv_equal(&nv, out.nva, 1, mem);
-  CU_ASSERT(0 == inflater.ctx.hd_table.len);
+  assert_size(0, ==, inflater.ctx.hd_table.len);
 
   nva_out_reset(&out, mem);
 
   /* Do it again */
-  CU_ASSERT(blocklen == inflate_hd(&inflater, &out, &bufs, 0, mem));
+  assert_ptrdiff(blocklen, ==, inflate_hd(&inflater, &out, &bufs, 0, mem));
 
-  CU_ASSERT(1 == out.nvlen);
+  assert_size(1, ==, out.nvlen);
   assert_nv_equal(&nv, out.nva, 1, mem);
-  CU_ASSERT(0 == inflater.ctx.hd_table.len);
+  assert_size(0, ==, inflater.ctx.hd_table.len);
 
   nva_out_reset(&out, mem);
   nghttp2_bufs_reset(&bufs);
@@ -489,17 +529,18 @@ void test_nghttp2_hd_inflate_clearall_inc(void) {
      header table */
   nv.valuelen = sizeof(value) - 2;
 
-  CU_ASSERT(
-      0 == nghttp2_hd_emit_newname_block(&bufs, &nv, NGHTTP2_HD_WITH_INDEXING));
+  assert_int(
+      0, ==,
+      nghttp2_hd_emit_newname_block(&bufs, &nv, NGHTTP2_HD_WITH_INDEXING));
 
-  blocklen = (ssize_t)nghttp2_bufs_len(&bufs);
+  blocklen = (nghttp2_ssize)nghttp2_bufs_len(&bufs);
 
-  CU_ASSERT(blocklen > 0);
-  CU_ASSERT(blocklen == inflate_hd(&inflater, &out, &bufs, 0, mem));
+  assert_ptrdiff(0, <, blocklen);
+  assert_ptrdiff(blocklen, ==, inflate_hd(&inflater, &out, &bufs, 0, mem));
 
-  CU_ASSERT(1 == out.nvlen);
+  assert_size(1, ==, out.nvlen);
   assert_nv_equal(&nv, out.nva, 1, mem);
-  CU_ASSERT(1 == inflater.ctx.hd_table.len);
+  assert_size(1, ==, inflater.ctx.hd_table.len);
 
   nva_out_reset(&out, mem);
   nghttp2_bufs_reset(&bufs);
@@ -530,13 +571,13 @@ void test_nghttp2_hd_inflate_zero_length_huffman(void) {
   /* ptr[3] = 0x80; */
 
   nghttp2_hd_inflate_init(&inflater, mem);
-  CU_ASSERT(4 == inflate_hd(&inflater, &out, &bufs, 0, mem));
+  assert_ptrdiff(4, ==, inflate_hd(&inflater, &out, &bufs, 0, mem));
 
-  CU_ASSERT(1 == out.nvlen);
-  CU_ASSERT(1 == out.nva[0].namelen);
-  CU_ASSERT('x' == out.nva[0].name[0]);
-  CU_ASSERT(NULL == out.nva[0].value);
-  CU_ASSERT(0 == out.nva[0].valuelen);
+  assert_size(1, ==, out.nvlen);
+  assert_size(1, ==, out.nva[0].namelen);
+  assert_uint8('x', ==, out.nva[0].name[0]);
+  assert_null(out.nva[0].value);
+  assert_size(0, ==, out.nva[0].valuelen);
 
   nva_out_reset(&out, mem);
   nghttp2_bufs_free(&bufs);
@@ -561,8 +602,8 @@ void test_nghttp2_hd_inflate_expect_table_size_update(void) {
      inflation. */
   nghttp2_hd_inflate_change_table_size(&inflater, 4095);
   nghttp2_hd_inflate_change_table_size(&inflater, 4096);
-  CU_ASSERT(NGHTTP2_ERR_HEADER_COMP ==
-            inflate_hd(&inflater, &out, &bufs, 0, mem));
+  assert_ptrdiff(NGHTTP2_ERR_HEADER_COMP, ==,
+                 inflate_hd(&inflater, &out, &bufs, 0, mem));
 
   nva_out_reset(&out, mem);
   nghttp2_hd_inflate_free(&inflater);
@@ -571,8 +612,8 @@ void test_nghttp2_hd_inflate_expect_table_size_update(void) {
    * size is not changed. */
   nghttp2_hd_inflate_init(&inflater, mem);
   nghttp2_hd_inflate_change_table_size(&inflater, 4096);
-  CU_ASSERT((ssize_t)nghttp2_bufs_len(&bufs) ==
-            inflate_hd(&inflater, &out, &bufs, 0, mem));
+  assert_ptrdiff((nghttp2_ssize)nghttp2_bufs_len(&bufs), ==,
+                 inflate_hd(&inflater, &out, &bufs, 0, mem));
 
   nva_out_reset(&out, mem);
   nghttp2_hd_inflate_free(&inflater);
@@ -581,8 +622,8 @@ void test_nghttp2_hd_inflate_expect_table_size_update(void) {
      new size is larger than current size. */
   nghttp2_hd_inflate_init(&inflater, mem);
   nghttp2_hd_inflate_change_table_size(&inflater, 4097);
-  CU_ASSERT((ssize_t)nghttp2_bufs_len(&bufs) ==
-            inflate_hd(&inflater, &out, &bufs, 0, mem));
+  assert_ptrdiff((nghttp2_ssize)nghttp2_bufs_len(&bufs), ==,
+                 inflate_hd(&inflater, &out, &bufs, 0, mem));
 
   nva_out_reset(&out, mem);
   nghttp2_hd_inflate_free(&inflater);
@@ -595,8 +636,8 @@ void test_nghttp2_hd_inflate_expect_table_size_update(void) {
   nghttp2_bufs_reset(&bufs);
   nghttp2_hd_emit_table_size(&bufs, 112);
 
-  CU_ASSERT(NGHTTP2_ERR_HEADER_COMP ==
-            inflate_hd(&inflater, &out, &bufs, 0, mem));
+  assert_ptrdiff(NGHTTP2_ERR_HEADER_COMP, ==,
+                 inflate_hd(&inflater, &out, &bufs, 0, mem));
 
   nva_out_reset(&out, mem);
   nghttp2_hd_inflate_free(&inflater);
@@ -610,8 +651,8 @@ void test_nghttp2_hd_inflate_expect_table_size_update(void) {
   nghttp2_hd_emit_table_size(&bufs, 111);
   nghttp2_hd_emit_table_size(&bufs, 4096);
 
-  CU_ASSERT((ssize_t)nghttp2_bufs_len(&bufs) ==
-            inflate_hd(&inflater, &out, &bufs, 0, mem));
+  assert_ptrdiff((nghttp2_ssize)nghttp2_bufs_len(&bufs), ==,
+                 inflate_hd(&inflater, &out, &bufs, 0, mem));
 
   nva_out_reset(&out, mem);
   nghttp2_hd_inflate_free(&inflater);
@@ -625,8 +666,8 @@ void test_nghttp2_hd_inflate_expect_table_size_update(void) {
   nghttp2_hd_emit_table_size(&bufs, 111);
   nghttp2_hd_emit_table_size(&bufs, 4096);
 
-  CU_ASSERT(NGHTTP2_ERR_HEADER_COMP ==
-            inflate_hd(&inflater, &out, &bufs, 0, mem));
+  assert_ptrdiff(NGHTTP2_ERR_HEADER_COMP, ==,
+                 inflate_hd(&inflater, &out, &bufs, 0, mem));
 
   nva_out_reset(&out, mem);
   nghttp2_hd_inflate_free(&inflater);
@@ -649,8 +690,8 @@ void test_nghttp2_hd_inflate_unexpected_table_size_update(void) {
 
   nghttp2_bufs_add(&bufs, data, sizeof(data));
   nghttp2_hd_inflate_init(&inflater, mem);
-  CU_ASSERT(NGHTTP2_ERR_HEADER_COMP ==
-            inflate_hd(&inflater, &out, &bufs, 0, mem));
+  assert_ptrdiff(NGHTTP2_ERR_HEADER_COMP, ==,
+                 inflate_hd(&inflater, &out, &bufs, 0, mem));
 
   nva_out_reset(&out, mem);
   nghttp2_bufs_free(&bufs);
@@ -664,8 +705,8 @@ void test_nghttp2_hd_ringbuf_reserve(void) {
   nghttp2_bufs bufs;
   nva_out out;
   int i;
-  ssize_t rv;
-  ssize_t blocklen;
+  nghttp2_ssize rv;
+  nghttp2_ssize blocklen;
   nghttp2_mem *mem;
 
   mem = nghttp2_mem_default();
@@ -688,14 +729,14 @@ void test_nghttp2_hd_ringbuf_reserve(void) {
   for (i = 0; i < 150; ++i) {
     memcpy(nv.value, &i, sizeof(i));
     rv = nghttp2_hd_deflate_hd_bufs(&deflater, &bufs, &nv, 1);
-    blocklen = (ssize_t)nghttp2_bufs_len(&bufs);
+    blocklen = (nghttp2_ssize)nghttp2_bufs_len(&bufs);
 
-    CU_ASSERT(0 == rv);
-    CU_ASSERT(blocklen > 0);
+    assert_ptrdiff(0, ==, rv);
+    assert_ptrdiff(0, <, blocklen);
 
-    CU_ASSERT(blocklen == inflate_hd(&inflater, &out, &bufs, 0, mem));
+    assert_ptrdiff(blocklen, ==, inflate_hd(&inflater, &out, &bufs, 0, mem));
 
-    CU_ASSERT(1 == out.nvlen);
+    assert_size(1, ==, out.nvlen);
     assert_nv_equal(&nv, out.nva, 1, mem);
 
     nva_out_reset(&out, mem);
@@ -715,9 +756,9 @@ void test_nghttp2_hd_change_table_size(void) {
   nghttp2_nv nva[] = {MAKE_NV("alpha", "bravo"), MAKE_NV("charlie", "delta")};
   nghttp2_nv nva2[] = {MAKE_NV(":path", "/")};
   nghttp2_bufs bufs;
-  ssize_t rv;
+  int rv;
   nva_out out;
-  ssize_t blocklen;
+  nghttp2_ssize blocklen;
   nghttp2_mem *mem;
 
   mem = nghttp2_mem_default();
@@ -729,87 +770,87 @@ void test_nghttp2_hd_change_table_size(void) {
   nghttp2_hd_inflate_init(&inflater, mem);
 
   /* inflater changes notifies 8000 max header table size */
-  CU_ASSERT(0 == nghttp2_hd_inflate_change_table_size(&inflater, 8000));
-  CU_ASSERT(0 == nghttp2_hd_deflate_change_table_size(&deflater, 8000));
+  assert_int(0, ==, nghttp2_hd_inflate_change_table_size(&inflater, 8000));
+  assert_int(0, ==, nghttp2_hd_deflate_change_table_size(&deflater, 8000));
 
-  CU_ASSERT(4096 == deflater.ctx.hd_table_bufsize_max);
+  assert_size(4096, ==, deflater.ctx.hd_table_bufsize_max);
 
-  CU_ASSERT(4096 == inflater.ctx.hd_table_bufsize_max);
-  CU_ASSERT(8000 == inflater.settings_hd_table_bufsize_max);
+  assert_size(4096, ==, inflater.ctx.hd_table_bufsize_max);
+  assert_size(8000, ==, inflater.settings_hd_table_bufsize_max);
 
   /* This will emit encoding context update with header table size 4096 */
   rv = nghttp2_hd_deflate_hd_bufs(&deflater, &bufs, nva, 2);
-  blocklen = (ssize_t)nghttp2_bufs_len(&bufs);
+  blocklen = (nghttp2_ssize)nghttp2_bufs_len(&bufs);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(blocklen > 0);
-  CU_ASSERT(2 == deflater.ctx.hd_table.len);
-  CU_ASSERT(63 == nghttp2_hd_deflate_get_num_table_entries(&deflater));
-  CU_ASSERT(4096 == deflater.ctx.hd_table_bufsize_max);
+  assert_int(0, ==, rv);
+  assert_ptrdiff(0, <, blocklen);
+  assert_size(2, ==, deflater.ctx.hd_table.len);
+  assert_size(63, ==, nghttp2_hd_deflate_get_num_table_entries(&deflater));
+  assert_size(4096, ==, deflater.ctx.hd_table_bufsize_max);
 
-  CU_ASSERT(blocklen == inflate_hd(&inflater, &out, &bufs, 0, mem));
-  CU_ASSERT(2 == inflater.ctx.hd_table.len);
-  CU_ASSERT(63 == nghttp2_hd_inflate_get_num_table_entries(&inflater));
-  CU_ASSERT(4096 == inflater.ctx.hd_table_bufsize_max);
-  CU_ASSERT(8000 == inflater.settings_hd_table_bufsize_max);
+  assert_ptrdiff(blocklen, ==, inflate_hd(&inflater, &out, &bufs, 0, mem));
+  assert_size(2, ==, inflater.ctx.hd_table.len);
+  assert_size(63, ==, nghttp2_hd_inflate_get_num_table_entries(&inflater));
+  assert_size(4096, ==, inflater.ctx.hd_table_bufsize_max);
+  assert_size(8000, ==, inflater.settings_hd_table_bufsize_max);
 
   nva_out_reset(&out, mem);
   nghttp2_bufs_reset(&bufs);
 
   /* inflater changes header table size to 1024 */
-  CU_ASSERT(0 == nghttp2_hd_inflate_change_table_size(&inflater, 1024));
-  CU_ASSERT(0 == nghttp2_hd_deflate_change_table_size(&deflater, 1024));
+  assert_int(0, ==, nghttp2_hd_inflate_change_table_size(&inflater, 1024));
+  assert_int(0, ==, nghttp2_hd_deflate_change_table_size(&deflater, 1024));
 
-  CU_ASSERT(1024 == deflater.ctx.hd_table_bufsize_max);
+  assert_size(1024, ==, deflater.ctx.hd_table_bufsize_max);
 
-  CU_ASSERT(1024 == inflater.ctx.hd_table_bufsize_max);
-  CU_ASSERT(1024 == inflater.settings_hd_table_bufsize_max);
+  assert_size(1024, ==, inflater.ctx.hd_table_bufsize_max);
+  assert_size(1024, ==, inflater.settings_hd_table_bufsize_max);
 
   rv = nghttp2_hd_deflate_hd_bufs(&deflater, &bufs, nva, 2);
-  blocklen = (ssize_t)nghttp2_bufs_len(&bufs);
+  blocklen = (nghttp2_ssize)nghttp2_bufs_len(&bufs);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(blocklen > 0);
-  CU_ASSERT(2 == deflater.ctx.hd_table.len);
-  CU_ASSERT(63 == nghttp2_hd_deflate_get_num_table_entries(&deflater));
-  CU_ASSERT(1024 == deflater.ctx.hd_table_bufsize_max);
+  assert_int(0, ==, rv);
+  assert_ptrdiff(0, <, blocklen);
+  assert_size(2, ==, deflater.ctx.hd_table.len);
+  assert_size(63, ==, nghttp2_hd_deflate_get_num_table_entries(&deflater));
+  assert_size(1024, ==, deflater.ctx.hd_table_bufsize_max);
 
-  CU_ASSERT(blocklen == inflate_hd(&inflater, &out, &bufs, 0, mem));
-  CU_ASSERT(2 == inflater.ctx.hd_table.len);
-  CU_ASSERT(63 == nghttp2_hd_inflate_get_num_table_entries(&inflater));
-  CU_ASSERT(1024 == inflater.ctx.hd_table_bufsize_max);
-  CU_ASSERT(1024 == inflater.settings_hd_table_bufsize_max);
+  assert_ptrdiff(blocklen, ==, inflate_hd(&inflater, &out, &bufs, 0, mem));
+  assert_size(2, ==, inflater.ctx.hd_table.len);
+  assert_size(63, ==, nghttp2_hd_inflate_get_num_table_entries(&inflater));
+  assert_size(1024, ==, inflater.ctx.hd_table_bufsize_max);
+  assert_size(1024, ==, inflater.settings_hd_table_bufsize_max);
 
   nva_out_reset(&out, mem);
   nghttp2_bufs_reset(&bufs);
 
   /* inflater changes header table size to 0 */
-  CU_ASSERT(0 == nghttp2_hd_inflate_change_table_size(&inflater, 0));
-  CU_ASSERT(0 == nghttp2_hd_deflate_change_table_size(&deflater, 0));
+  assert_int(0, ==, nghttp2_hd_inflate_change_table_size(&inflater, 0));
+  assert_int(0, ==, nghttp2_hd_deflate_change_table_size(&deflater, 0));
 
-  CU_ASSERT(0 == deflater.ctx.hd_table.len);
-  CU_ASSERT(61 == nghttp2_hd_deflate_get_num_table_entries(&deflater));
-  CU_ASSERT(0 == deflater.ctx.hd_table_bufsize_max);
+  assert_size(0, ==, deflater.ctx.hd_table.len);
+  assert_size(61, ==, nghttp2_hd_deflate_get_num_table_entries(&deflater));
+  assert_size(0, ==, deflater.ctx.hd_table_bufsize_max);
 
-  CU_ASSERT(0 == inflater.ctx.hd_table.len);
-  CU_ASSERT(61 == nghttp2_hd_inflate_get_num_table_entries(&inflater));
-  CU_ASSERT(0 == inflater.ctx.hd_table_bufsize_max);
-  CU_ASSERT(0 == inflater.settings_hd_table_bufsize_max);
+  assert_size(0, ==, inflater.ctx.hd_table.len);
+  assert_size(61, ==, nghttp2_hd_inflate_get_num_table_entries(&inflater));
+  assert_size(0, ==, inflater.ctx.hd_table_bufsize_max);
+  assert_size(0, ==, inflater.settings_hd_table_bufsize_max);
 
   rv = nghttp2_hd_deflate_hd_bufs(&deflater, &bufs, nva, 2);
-  blocklen = (ssize_t)nghttp2_bufs_len(&bufs);
+  blocklen = (nghttp2_ssize)nghttp2_bufs_len(&bufs);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(blocklen > 0);
-  CU_ASSERT(0 == deflater.ctx.hd_table.len);
-  CU_ASSERT(61 == nghttp2_hd_deflate_get_num_table_entries(&deflater));
-  CU_ASSERT(0 == deflater.ctx.hd_table_bufsize_max);
+  assert_int(0, ==, rv);
+  assert_ptrdiff(0, <, blocklen);
+  assert_size(0, ==, deflater.ctx.hd_table.len);
+  assert_size(61, ==, nghttp2_hd_deflate_get_num_table_entries(&deflater));
+  assert_size(0, ==, deflater.ctx.hd_table_bufsize_max);
 
-  CU_ASSERT(blocklen == inflate_hd(&inflater, &out, &bufs, 0, mem));
-  CU_ASSERT(0 == inflater.ctx.hd_table.len);
-  CU_ASSERT(61 == nghttp2_hd_inflate_get_num_table_entries(&inflater));
-  CU_ASSERT(0 == inflater.ctx.hd_table_bufsize_max);
-  CU_ASSERT(0 == inflater.settings_hd_table_bufsize_max);
+  assert_ptrdiff(blocklen, ==, inflate_hd(&inflater, &out, &bufs, 0, mem));
+  assert_size(0, ==, inflater.ctx.hd_table.len);
+  assert_size(61, ==, nghttp2_hd_inflate_get_num_table_entries(&inflater));
+  assert_size(0, ==, inflater.ctx.hd_table_bufsize_max);
+  assert_size(0, ==, inflater.settings_hd_table_bufsize_max);
 
   nva_out_reset(&out, mem);
   nghttp2_bufs_reset(&bufs);
@@ -825,53 +866,57 @@ void test_nghttp2_hd_change_table_size(void) {
   nghttp2_hd_inflate_init(&inflater, mem);
 
   /* First inflater changes header table size to 8000 */
-  CU_ASSERT(0 == nghttp2_hd_inflate_change_table_size(&inflater, 8000));
-  CU_ASSERT(0 == nghttp2_hd_deflate_change_table_size(&deflater, 8000));
+  assert_int(0, ==, nghttp2_hd_inflate_change_table_size(&inflater, 8000));
+  assert_int(0, ==, nghttp2_hd_deflate_change_table_size(&deflater, 8000));
 
-  CU_ASSERT(8000 == deflater.ctx.hd_table_bufsize_max);
-  CU_ASSERT(8000 == nghttp2_hd_deflate_get_max_dynamic_table_size(&deflater));
-  CU_ASSERT(4096 == inflater.ctx.hd_table_bufsize_max);
-  CU_ASSERT(4096 == nghttp2_hd_inflate_get_max_dynamic_table_size(&inflater));
-  CU_ASSERT(8000 == inflater.settings_hd_table_bufsize_max);
+  assert_size(8000, ==, deflater.ctx.hd_table_bufsize_max);
+  assert_size(8000, ==,
+              nghttp2_hd_deflate_get_max_dynamic_table_size(&deflater));
+  assert_size(4096, ==, inflater.ctx.hd_table_bufsize_max);
+  assert_size(4096, ==,
+              nghttp2_hd_inflate_get_max_dynamic_table_size(&inflater));
+  assert_size(8000, ==, inflater.settings_hd_table_bufsize_max);
 
   rv = nghttp2_hd_deflate_hd_bufs(&deflater, &bufs, nva, 2);
-  blocklen = (ssize_t)nghttp2_bufs_len(&bufs);
+  blocklen = (nghttp2_ssize)nghttp2_bufs_len(&bufs);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(blocklen > 0);
-  CU_ASSERT(2 == deflater.ctx.hd_table.len);
-  CU_ASSERT(8000 == deflater.ctx.hd_table_bufsize_max);
+  assert_int(0, ==, rv);
+  assert_ptrdiff(0, <, blocklen);
+  assert_size(2, ==, deflater.ctx.hd_table.len);
+  assert_size(8000, ==, deflater.ctx.hd_table_bufsize_max);
 
-  CU_ASSERT(blocklen == inflate_hd(&inflater, &out, &bufs, 0, mem));
-  CU_ASSERT(2 == inflater.ctx.hd_table.len);
-  CU_ASSERT(8000 == inflater.ctx.hd_table_bufsize_max);
-  CU_ASSERT(8000 == inflater.settings_hd_table_bufsize_max);
+  assert_ptrdiff(blocklen, ==, inflate_hd(&inflater, &out, &bufs, 0, mem));
+  assert_size(2, ==, inflater.ctx.hd_table.len);
+  assert_size(8000, ==, inflater.ctx.hd_table_bufsize_max);
+  assert_size(8000, ==, inflater.settings_hd_table_bufsize_max);
 
   nva_out_reset(&out, mem);
   nghttp2_bufs_reset(&bufs);
 
-  CU_ASSERT(0 == nghttp2_hd_inflate_change_table_size(&inflater, 16383));
-  CU_ASSERT(0 == nghttp2_hd_deflate_change_table_size(&deflater, 16383));
+  assert_int(0, ==, nghttp2_hd_inflate_change_table_size(&inflater, 16383));
+  assert_int(0, ==, nghttp2_hd_deflate_change_table_size(&deflater, 16383));
 
-  CU_ASSERT(8192 == deflater.ctx.hd_table_bufsize_max);
-  CU_ASSERT(8192 == nghttp2_hd_deflate_get_max_dynamic_table_size(&deflater));
+  assert_size(8192, ==, deflater.ctx.hd_table_bufsize_max);
+  assert_size(8192, ==,
+              nghttp2_hd_deflate_get_max_dynamic_table_size(&deflater));
 
-  CU_ASSERT(8000 == inflater.ctx.hd_table_bufsize_max);
-  CU_ASSERT(8000 == nghttp2_hd_inflate_get_max_dynamic_table_size(&inflater));
-  CU_ASSERT(16383 == inflater.settings_hd_table_bufsize_max);
+  assert_size(8000, ==, inflater.ctx.hd_table_bufsize_max);
+  assert_size(8000, ==,
+              nghttp2_hd_inflate_get_max_dynamic_table_size(&inflater));
+  assert_size(16383, ==, inflater.settings_hd_table_bufsize_max);
 
   rv = nghttp2_hd_deflate_hd_bufs(&deflater, &bufs, nva, 2);
-  blocklen = (ssize_t)nghttp2_bufs_len(&bufs);
+  blocklen = (nghttp2_ssize)nghttp2_bufs_len(&bufs);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(blocklen > 0);
-  CU_ASSERT(2 == deflater.ctx.hd_table.len);
-  CU_ASSERT(8192 == deflater.ctx.hd_table_bufsize_max);
+  assert_int(0, ==, rv);
+  assert_ptrdiff(0, <, blocklen);
+  assert_size(2, ==, deflater.ctx.hd_table.len);
+  assert_size(8192, ==, deflater.ctx.hd_table_bufsize_max);
 
-  CU_ASSERT(blocklen == inflate_hd(&inflater, &out, &bufs, 0, mem));
-  CU_ASSERT(2 == inflater.ctx.hd_table.len);
-  CU_ASSERT(8192 == inflater.ctx.hd_table_bufsize_max);
-  CU_ASSERT(16383 == inflater.settings_hd_table_bufsize_max);
+  assert_ptrdiff(blocklen, ==, inflate_hd(&inflater, &out, &bufs, 0, mem));
+  assert_size(2, ==, inflater.ctx.hd_table.len);
+  assert_size(8192, ==, inflater.ctx.hd_table_bufsize_max);
+  assert_size(16383, ==, inflater.settings_hd_table_bufsize_max);
 
   nva_out_reset(&out, mem);
   nghttp2_bufs_reset(&bufs);
@@ -879,9 +924,9 @@ void test_nghttp2_hd_change_table_size(void) {
   /* Lastly, check the error condition */
 
   rv = nghttp2_hd_emit_table_size(&bufs, 25600);
-  CU_ASSERT(rv == 0);
-  CU_ASSERT(NGHTTP2_ERR_HEADER_COMP ==
-            inflate_hd(&inflater, &out, &bufs, 0, mem));
+  assert_int(0, ==, rv);
+  assert_ptrdiff(NGHTTP2_ERR_HEADER_COMP, ==,
+                 inflate_hd(&inflater, &out, &bufs, 0, mem));
 
   nva_out_reset(&out, mem);
   nghttp2_bufs_reset(&bufs);
@@ -894,21 +939,21 @@ void test_nghttp2_hd_change_table_size(void) {
   nghttp2_hd_deflate_init2(&deflater, 1024, mem);
   nghttp2_hd_inflate_init(&inflater, mem);
 
-  CU_ASSERT(1024 == deflater.ctx.hd_table_bufsize_max);
+  assert_size(1024, ==, deflater.ctx.hd_table_bufsize_max);
 
   /* This emits context update with buffer size 1024 */
   rv = nghttp2_hd_deflate_hd_bufs(&deflater, &bufs, nva, 2);
-  blocklen = (ssize_t)nghttp2_bufs_len(&bufs);
+  blocklen = (nghttp2_ssize)nghttp2_bufs_len(&bufs);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(blocklen > 0);
-  CU_ASSERT(2 == deflater.ctx.hd_table.len);
-  CU_ASSERT(1024 == deflater.ctx.hd_table_bufsize_max);
+  assert_int(0, ==, rv);
+  assert_ptrdiff(0, <, blocklen);
+  assert_size(2, ==, deflater.ctx.hd_table.len);
+  assert_size(1024, ==, deflater.ctx.hd_table_bufsize_max);
 
-  CU_ASSERT(blocklen == inflate_hd(&inflater, &out, &bufs, 0, mem));
-  CU_ASSERT(2 == inflater.ctx.hd_table.len);
-  CU_ASSERT(1024 == inflater.ctx.hd_table_bufsize_max);
-  CU_ASSERT(4096 == inflater.settings_hd_table_bufsize_max);
+  assert_ptrdiff(blocklen, ==, inflate_hd(&inflater, &out, &bufs, 0, mem));
+  assert_size(2, ==, inflater.ctx.hd_table.len);
+  assert_size(1024, ==, inflater.ctx.hd_table_bufsize_max);
+  assert_size(4096, ==, inflater.settings_hd_table_bufsize_max);
 
   nva_out_reset(&out, mem);
   nghttp2_bufs_reset(&bufs);
@@ -920,18 +965,20 @@ void test_nghttp2_hd_change_table_size(void) {
   nghttp2_hd_deflate_init2(&deflater, UINT32_MAX, mem);
   nghttp2_hd_inflate_init(&inflater, mem);
 
-  CU_ASSERT(0 == nghttp2_hd_inflate_change_table_size(&inflater, UINT32_MAX));
-  CU_ASSERT(0 == nghttp2_hd_deflate_change_table_size(&deflater, UINT32_MAX));
+  assert_int(0, ==,
+             nghttp2_hd_inflate_change_table_size(&inflater, UINT32_MAX));
+  assert_int(0, ==,
+             nghttp2_hd_deflate_change_table_size(&deflater, UINT32_MAX));
 
   rv = nghttp2_hd_deflate_hd_bufs(&deflater, &bufs, nva, 2);
-  blocklen = (ssize_t)nghttp2_bufs_len(&bufs);
+  blocklen = (nghttp2_ssize)nghttp2_bufs_len(&bufs);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(UINT32_MAX == deflater.ctx.hd_table_bufsize_max);
+  assert_int(0, ==, rv);
+  assert_size(UINT32_MAX, ==, deflater.ctx.hd_table_bufsize_max);
 
-  CU_ASSERT(blocklen == inflate_hd(&inflater, &out, &bufs, 0, mem));
-  CU_ASSERT(UINT32_MAX == inflater.ctx.hd_table_bufsize_max);
-  CU_ASSERT(UINT32_MAX == inflater.settings_hd_table_bufsize_max);
+  assert_ptrdiff(blocklen, ==, inflate_hd(&inflater, &out, &bufs, 0, mem));
+  assert_size(UINT32_MAX, ==, inflater.ctx.hd_table_bufsize_max);
+  assert_size(UINT32_MAX, ==, inflater.settings_hd_table_bufsize_max);
 
   nva_out_reset(&out, mem);
   nghttp2_bufs_reset(&bufs);
@@ -943,25 +990,25 @@ void test_nghttp2_hd_change_table_size(void) {
   nghttp2_hd_deflate_init2(&deflater, 4096, mem);
   nghttp2_hd_inflate_init(&inflater, mem);
 
-  CU_ASSERT(0 == nghttp2_hd_inflate_change_table_size(&inflater, 0));
-  CU_ASSERT(0 == nghttp2_hd_inflate_change_table_size(&inflater, 3000));
-  CU_ASSERT(0 == nghttp2_hd_deflate_change_table_size(&deflater, 0));
-  CU_ASSERT(0 == nghttp2_hd_deflate_change_table_size(&deflater, 3000));
+  assert_int(0, ==, nghttp2_hd_inflate_change_table_size(&inflater, 0));
+  assert_int(0, ==, nghttp2_hd_inflate_change_table_size(&inflater, 3000));
+  assert_int(0, ==, nghttp2_hd_deflate_change_table_size(&deflater, 0));
+  assert_int(0, ==, nghttp2_hd_deflate_change_table_size(&deflater, 3000));
 
-  CU_ASSERT(0 == deflater.min_hd_table_bufsize_max);
-  CU_ASSERT(3000 == deflater.ctx.hd_table_bufsize_max);
+  assert_size(0, ==, deflater.min_hd_table_bufsize_max);
+  assert_size(3000, ==, deflater.ctx.hd_table_bufsize_max);
 
   rv = nghttp2_hd_deflate_hd_bufs(&deflater, &bufs, nva2, 1);
-  blocklen = (ssize_t)nghttp2_bufs_len(&bufs);
+  blocklen = (nghttp2_ssize)nghttp2_bufs_len(&bufs);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(3 < blocklen);
-  CU_ASSERT(3000 == deflater.ctx.hd_table_bufsize_max);
-  CU_ASSERT(UINT32_MAX == deflater.min_hd_table_bufsize_max);
+  assert_int(0, ==, rv);
+  assert_ptrdiff(3, <, blocklen);
+  assert_size(3000, ==, deflater.ctx.hd_table_bufsize_max);
+  assert_size(UINT32_MAX, ==, deflater.min_hd_table_bufsize_max);
 
-  CU_ASSERT(blocklen == inflate_hd(&inflater, &out, &bufs, 0, mem));
-  CU_ASSERT(3000 == inflater.ctx.hd_table_bufsize_max);
-  CU_ASSERT(3000 == inflater.settings_hd_table_bufsize_max);
+  assert_ptrdiff(blocklen, ==, inflate_hd(&inflater, &out, &bufs, 0, mem));
+  assert_size(3000, ==, inflater.ctx.hd_table_bufsize_max);
+  assert_size(3000, ==, inflater.settings_hd_table_bufsize_max);
 
   nva_out_reset(&out, mem);
   nghttp2_bufs_reset(&bufs);
@@ -977,7 +1024,7 @@ static void check_deflate_inflate(nghttp2_hd_deflater *deflater,
                                   nghttp2_nv *nva, size_t nvlen,
                                   nghttp2_mem *mem) {
   nghttp2_bufs bufs;
-  ssize_t blocklen;
+  nghttp2_ssize blocklen;
   nva_out out;
   int rv;
 
@@ -985,14 +1032,14 @@ static void check_deflate_inflate(nghttp2_hd_deflater *deflater,
 
   nva_out_init(&out);
   rv = nghttp2_hd_deflate_hd_bufs(deflater, &bufs, nva, nvlen);
-  blocklen = (ssize_t)nghttp2_bufs_len(&bufs);
+  blocklen = (nghttp2_ssize)nghttp2_bufs_len(&bufs);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(blocklen >= 0);
+  assert_int(0, ==, rv);
+  assert_ptrdiff(0, <=, blocklen);
 
-  CU_ASSERT(blocklen == inflate_hd(inflater, &out, &bufs, 0, mem));
+  assert_ptrdiff(blocklen, ==, inflate_hd(inflater, &out, &bufs, 0, mem));
 
-  CU_ASSERT(nvlen == out.nvlen);
+  assert_size(nvlen, ==, out.nvlen);
   assert_nv_equal(nva, out.nva, nvlen, mem);
 
   nva_out_reset(&out, mem);
@@ -1161,7 +1208,7 @@ void test_nghttp2_hd_no_index(void) {
   nghttp2_hd_deflater deflater;
   nghttp2_hd_inflater inflater;
   nghttp2_bufs bufs;
-  ssize_t blocklen;
+  nghttp2_ssize blocklen;
   nghttp2_nv nva[] = {
       MAKE_NV(":method", "GET"), MAKE_NV(":method", "POST"),
       MAKE_NV(":path", "/foo"),  MAKE_NV("version", "HTTP/1.1"),
@@ -1187,18 +1234,18 @@ void test_nghttp2_hd_no_index(void) {
   nghttp2_hd_inflate_init(&inflater, mem);
 
   rv = nghttp2_hd_deflate_hd_bufs(&deflater, &bufs, nva, ARRLEN(nva));
-  blocklen = (ssize_t)nghttp2_bufs_len(&bufs);
+  blocklen = (nghttp2_ssize)nghttp2_bufs_len(&bufs);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(blocklen > 0);
-  CU_ASSERT(blocklen == inflate_hd(&inflater, &out, &bufs, 0, mem));
+  assert_int(0, ==, rv);
+  assert_ptrdiff(0, <, blocklen);
+  assert_ptrdiff(blocklen, ==, inflate_hd(&inflater, &out, &bufs, 0, mem));
 
-  CU_ASSERT(ARRLEN(nva) == out.nvlen);
+  assert_size(ARRLEN(nva), ==, out.nvlen);
   assert_nv_equal(nva, out.nva, ARRLEN(nva), mem);
 
-  CU_ASSERT(out.nva[0].flags == NGHTTP2_NV_FLAG_NONE);
+  assert_uint8(NGHTTP2_NV_FLAG_NONE, ==, out.nva[0].flags);
   for (i = 1; i < ARRLEN(nva); ++i) {
-    CU_ASSERT(out.nva[i].flags == NGHTTP2_NV_FLAG_NO_INDEX);
+    assert_uint8(NGHTTP2_NV_FLAG_NO_INDEX, ==, out.nva[i].flags);
   }
 
   nva_out_reset(&out, mem);
@@ -1222,17 +1269,17 @@ void test_nghttp2_hd_deflate_bound(void) {
 
   bound = nghttp2_hd_deflate_bound(&deflater, nva, ARRLEN(nva));
 
-  CU_ASSERT(12 + 6 * 2 * 2 + nva[0].namelen + nva[0].valuelen + nva[1].namelen +
-                nva[1].valuelen ==
-            bound);
+  assert_size(12 + 6 * 2 * 2 + nva[0].namelen + nva[0].valuelen +
+                  nva[1].namelen + nva[1].valuelen,
+              ==, bound);
 
   nghttp2_hd_deflate_hd_bufs(&deflater, &bufs, nva, ARRLEN(nva));
 
-  CU_ASSERT(bound > (size_t)nghttp2_bufs_len(&bufs));
+  assert_size((size_t)nghttp2_bufs_len(&bufs), <, bound);
 
   bound2 = nghttp2_hd_deflate_bound(&deflater, nva, ARRLEN(nva));
 
-  CU_ASSERT(bound == bound2);
+  assert_size(bound, ==, bound2);
 
   nghttp2_bufs_free(&bufs);
   nghttp2_hd_deflate_free(&deflater);
@@ -1244,25 +1291,25 @@ void test_nghttp2_hd_public_api(void) {
   nghttp2_nv nva[] = {MAKE_NV("alpha", "bravo"), MAKE_NV("charlie", "delta")};
   uint8_t buf[4096];
   size_t buflen;
-  ssize_t blocklen;
+  nghttp2_ssize blocklen;
   nghttp2_bufs bufs;
   nghttp2_mem *mem;
 
   mem = nghttp2_mem_default();
 
-  CU_ASSERT(0 == nghttp2_hd_deflate_new(&deflater, 4096));
-  CU_ASSERT(0 == nghttp2_hd_inflate_new(&inflater));
+  assert_int(0, ==, nghttp2_hd_deflate_new(&deflater, 4096));
+  assert_int(0, ==, nghttp2_hd_inflate_new(&inflater));
 
   buflen = nghttp2_hd_deflate_bound(deflater, nva, ARRLEN(nva));
 
-  blocklen = nghttp2_hd_deflate_hd(deflater, buf, buflen, nva, ARRLEN(nva));
+  blocklen = nghttp2_hd_deflate_hd2(deflater, buf, buflen, nva, ARRLEN(nva));
 
-  CU_ASSERT(blocklen > 0);
+  assert_ptrdiff(0, <, blocklen);
 
   nghttp2_bufs_wrap_init(&bufs, buf, (size_t)blocklen, mem);
   bufs.head->buf.last += blocklen;
 
-  CU_ASSERT(blocklen == inflate_hd(inflater, NULL, &bufs, 0, mem));
+  assert_ptrdiff(blocklen, ==, inflate_hd(inflater, NULL, &bufs, 0, mem));
 
   nghttp2_bufs_wrap_free(&bufs);
 
@@ -1270,12 +1317,12 @@ void test_nghttp2_hd_public_api(void) {
   nghttp2_hd_deflate_del(deflater);
 
   /* See NGHTTP2_ERR_INSUFF_BUFSIZE */
-  CU_ASSERT(0 == nghttp2_hd_deflate_new(&deflater, 4096));
+  assert_int(0, ==, nghttp2_hd_deflate_new(&deflater, 4096));
 
-  blocklen = nghttp2_hd_deflate_hd(deflater, buf, (size_t)(blocklen - 1), nva,
-                                   ARRLEN(nva));
+  blocklen = nghttp2_hd_deflate_hd2(deflater, buf, (size_t)(blocklen - 1), nva,
+                                    ARRLEN(nva));
 
-  CU_ASSERT(NGHTTP2_ERR_INSUFF_BUFSIZE == blocklen);
+  assert_ptrdiff(NGHTTP2_ERR_INSUFF_BUFSIZE, ==, blocklen);
 
   nghttp2_hd_deflate_del(deflater);
 }
@@ -1292,7 +1339,7 @@ void test_nghttp2_hd_deflate_hd_vec(void) {
       MAKE_NV("content-length", "1000000007"),
   };
   uint8_t buf[4096];
-  ssize_t blocklen;
+  nghttp2_ssize blocklen;
   nghttp2_mem *mem;
   nghttp2_vec vec[256];
   size_t buflen;
@@ -1314,16 +1361,16 @@ void test_nghttp2_hd_deflate_hd_vec(void) {
   vec[1].base = &buf[buflen / 2];
   vec[1].len = buflen / 2;
 
-  blocklen = nghttp2_hd_deflate_hd_vec(deflater, vec, 2, nva, ARRLEN(nva));
+  blocklen = nghttp2_hd_deflate_hd_vec2(deflater, vec, 2, nva, ARRLEN(nva));
 
-  CU_ASSERT(blocklen > 0);
+  assert_ptrdiff(0, <, blocklen);
 
   nghttp2_bufs_wrap_init(&bufs, buf, (size_t)blocklen, mem);
   bufs.head->buf.last += blocklen;
 
-  CU_ASSERT(blocklen == inflate_hd(inflater, &out, &bufs, 0, mem));
+  assert_ptrdiff(blocklen, ==, inflate_hd(inflater, &out, &bufs, 0, mem));
 
-  CU_ASSERT(ARRLEN(nva) == out.nvlen);
+  assert_size(ARRLEN(nva), ==, out.nvlen);
   assert_nv_equal(nva, out.nva, ARRLEN(nva), mem);
 
   nghttp2_bufs_wrap_free(&bufs);
@@ -1336,9 +1383,9 @@ void test_nghttp2_hd_deflate_hd_vec(void) {
   nghttp2_hd_deflate_new(&deflater, 4096);
   nghttp2_hd_inflate_new(&inflater);
 
-  blocklen = nghttp2_hd_deflate_hd_vec(deflater, NULL, 0, nva, ARRLEN(nva));
+  blocklen = nghttp2_hd_deflate_hd_vec2(deflater, NULL, 0, nva, ARRLEN(nva));
 
-  CU_ASSERT(NGHTTP2_ERR_INSUFF_BUFSIZE == blocklen);
+  assert_ptrdiff(NGHTTP2_ERR_INSUFF_BUFSIZE, ==, blocklen);
 
   nghttp2_hd_inflate_del(inflater);
   nghttp2_hd_deflate_del(deflater);
@@ -1352,9 +1399,9 @@ void test_nghttp2_hd_deflate_hd_vec(void) {
   nghttp2_hd_deflate_new(&deflater, 4096);
   nghttp2_hd_inflate_new(&inflater);
 
-  blocklen = nghttp2_hd_deflate_hd_vec(deflater, vec, 2, nva, ARRLEN(nva));
+  blocklen = nghttp2_hd_deflate_hd_vec2(deflater, vec, 2, nva, ARRLEN(nva));
 
-  CU_ASSERT(NGHTTP2_ERR_INSUFF_BUFSIZE == blocklen);
+  assert_ptrdiff(NGHTTP2_ERR_INSUFF_BUFSIZE, ==, blocklen);
 
   nghttp2_hd_inflate_del(inflater);
   nghttp2_hd_deflate_del(deflater);
@@ -1370,15 +1417,15 @@ void test_nghttp2_hd_deflate_hd_vec(void) {
   vec[1].base = &buf[buflen / 2];
   vec[1].len = (buflen / 2) + 1;
 
-  blocklen = nghttp2_hd_deflate_hd_vec(deflater, vec, 2, nva, ARRLEN(nva));
+  blocklen = nghttp2_hd_deflate_hd_vec2(deflater, vec, 2, nva, ARRLEN(nva));
 
-  CU_ASSERT(blocklen > 0);
+  assert_ptrdiff(0, <, blocklen);
 
   nghttp2_bufs_wrap_init(&bufs, buf, (size_t)blocklen, mem);
   bufs.head->buf.last += blocklen;
 
-  CU_ASSERT(blocklen == inflate_hd(inflater, &out, &bufs, 0, mem));
-  CU_ASSERT(ARRLEN(nva) == out.nvlen);
+  assert_ptrdiff(blocklen, ==, inflate_hd(inflater, &out, &bufs, 0, mem));
+  assert_size(ARRLEN(nva), ==, out.nvlen);
   assert_nv_equal(nva, out.nva, ARRLEN(nva), mem);
 
   nghttp2_bufs_wrap_free(&bufs);
@@ -1400,15 +1447,16 @@ void test_nghttp2_hd_deflate_hd_vec(void) {
     vec[i].len = 1;
   }
 
-  blocklen = nghttp2_hd_deflate_hd_vec(deflater, vec, buflen, nva, ARRLEN(nva));
+  blocklen =
+      nghttp2_hd_deflate_hd_vec2(deflater, vec, buflen, nva, ARRLEN(nva));
 
-  CU_ASSERT(blocklen > 0);
+  assert_ptrdiff(0, <, blocklen);
 
   nghttp2_bufs_wrap_init(&bufs, buf, (size_t)blocklen, mem);
   bufs.head->buf.last += blocklen;
 
-  CU_ASSERT(blocklen == inflate_hd(inflater, &out, &bufs, 0, mem));
-  CU_ASSERT(ARRLEN(nva) == out.nvlen);
+  assert_ptrdiff(blocklen, ==, inflate_hd(inflater, &out, &bufs, 0, mem));
+  assert_size(ARRLEN(nva), ==, out.nvlen);
   assert_nv_equal(nva, out.nva, ARRLEN(nva), mem);
 
   nghttp2_bufs_wrap_free(&bufs);
@@ -1453,7 +1501,7 @@ void test_nghttp2_hd_decode_length(void) {
   uint8_t buf[16];
   uint8_t *bufp;
   size_t len;
-  ssize_t rv;
+  nghttp2_ssize rv;
   size_t i;
 
   memset(buf, 0, sizeof(buf));
@@ -1461,9 +1509,9 @@ void test_nghttp2_hd_decode_length(void) {
 
   rv = nghttp2_hd_decode_length(&out, &shift, &fin, 0, 0, buf, buf + len, 7);
 
-  CU_ASSERT((ssize_t)len == rv);
-  CU_ASSERT(0 != fin);
-  CU_ASSERT(UINT32_MAX == out);
+  assert_ptrdiff((nghttp2_ssize)len, ==, rv);
+  assert_true(fin);
+  assert_uint32(UINT32_MAX, ==, out);
 
   /* Make sure that we can decode integer if we feed 1 byte at a
      time */
@@ -1476,16 +1524,16 @@ void test_nghttp2_hd_decode_length(void) {
     rv = nghttp2_hd_decode_length(&out, &shift, &fin, out, shift, bufp,
                                   bufp + 1, 7);
 
-    CU_ASSERT(rv == 1);
+    assert_ptrdiff(1, ==, rv);
 
     if (fin) {
       break;
     }
   }
 
-  CU_ASSERT(i == len - 1);
-  CU_ASSERT(0 != fin);
-  CU_ASSERT(UINT32_MAX == out);
+  assert_size(len - 1, ==, i);
+  assert_true(fin);
+  assert_size(UINT32_MAX, ==, out);
 
   /* Check overflow case */
   memset(buf, 0, sizeof(buf));
@@ -1493,7 +1541,7 @@ void test_nghttp2_hd_decode_length(void) {
 
   rv = nghttp2_hd_decode_length(&out, &shift, &fin, 0, 0, buf, buf + len, 7);
 
-  CU_ASSERT(-1 == rv);
+  assert_ptrdiff(-1, ==, rv);
 
   /* Check the case that shift goes beyond 32 bits */
   buf[0] = 255;
@@ -1506,12 +1554,12 @@ void test_nghttp2_hd_decode_length(void) {
 
   rv = nghttp2_hd_decode_length(&out, &shift, &fin, 0, 0, buf, buf + 7, 8);
 
-  CU_ASSERT(-1 == rv);
+  assert_ptrdiff(-1, ==, rv);
 }
 
 void test_nghttp2_hd_huff_encode(void) {
   int rv;
-  ssize_t len;
+  nghttp2_ssize len;
   nghttp2_buf outbuf;
   nghttp2_bufs bufs;
   nghttp2_hd_huff_decode_context ctx;
@@ -1524,17 +1572,17 @@ void test_nghttp2_hd_huff_encode(void) {
 
   rv = nghttp2_hd_huff_encode(&bufs, t1, sizeof(t1));
 
-  CU_ASSERT(rv == 0);
+  assert_int(0, ==, rv);
 
   nghttp2_hd_huff_decode_context_init(&ctx);
 
   len = nghttp2_hd_huff_decode(&ctx, &outbuf, bufs.cur->buf.pos,
                                nghttp2_bufs_len(&bufs), 1);
 
-  CU_ASSERT((ssize_t)nghttp2_bufs_len(&bufs) == len);
-  CU_ASSERT((ssize_t)sizeof(t1) == nghttp2_buf_len(&outbuf));
+  assert_ptrdiff((nghttp2_ssize)nghttp2_bufs_len(&bufs), ==, len);
+  assert_size(sizeof(t1), ==, nghttp2_buf_len(&outbuf));
 
-  CU_ASSERT(0 == memcmp(t1, outbuf.pos, sizeof(t1)));
+  assert_memory_equal(sizeof(t1), t1, outbuf.pos);
 
   nghttp2_bufs_free(&bufs);
 }
@@ -1544,34 +1592,34 @@ void test_nghttp2_hd_huff_decode(void) {
   nghttp2_hd_huff_decode_context ctx;
   nghttp2_buf outbuf;
   uint8_t b[256];
-  ssize_t len;
+  nghttp2_ssize len;
 
   nghttp2_buf_wrap_init(&outbuf, b, sizeof(b));
   nghttp2_hd_huff_decode_context_init(&ctx);
   len = nghttp2_hd_huff_decode(&ctx, &outbuf, e, 1, 1);
 
-  CU_ASSERT(1 == len);
-  CU_ASSERT(0 == memcmp("a", outbuf.pos, 1));
+  assert_ptrdiff(1, ==, len);
+  assert_memory_equal(1, "a", outbuf.pos);
 
   /* Premature sequence must elicit decoding error */
   nghttp2_buf_wrap_init(&outbuf, b, sizeof(b));
   nghttp2_hd_huff_decode_context_init(&ctx);
   len = nghttp2_hd_huff_decode(&ctx, &outbuf, e, 2, 1);
 
-  CU_ASSERT(NGHTTP2_ERR_HEADER_COMP == len);
+  assert_ptrdiff(NGHTTP2_ERR_HEADER_COMP, ==, len);
 
   /* Fully decoding EOS is error */
   nghttp2_buf_wrap_init(&outbuf, b, sizeof(b));
   nghttp2_hd_huff_decode_context_init(&ctx);
   len = nghttp2_hd_huff_decode(&ctx, &outbuf, e, 2, 6);
 
-  CU_ASSERT(NGHTTP2_ERR_HEADER_COMP == len);
+  assert_ptrdiff(NGHTTP2_ERR_HEADER_COMP, ==, len);
 
   /* Check failure state */
   nghttp2_buf_wrap_init(&outbuf, b, sizeof(b));
   nghttp2_hd_huff_decode_context_init(&ctx);
   len = nghttp2_hd_huff_decode(&ctx, &outbuf, e, 5, 0);
 
-  CU_ASSERT(5 == len);
-  CU_ASSERT(nghttp2_hd_huff_decode_failure_state(&ctx));
+  assert_ptrdiff(5, ==, len);
+  assert_true(nghttp2_hd_huff_decode_failure_state(&ctx));
 }
diff --git a/tests/nghttp2_hd_test.h b/tests/nghttp2_hd_test.h
index ab0117c..9d5ec8f 100644
--- a/tests/nghttp2_hd_test.h
+++ b/tests/nghttp2_hd_test.h
@@ -29,27 +29,33 @@
 #  include <config.h>
 #endif /* HAVE_CONFIG_H */
 
-void test_nghttp2_hd_deflate(void);
-void test_nghttp2_hd_deflate_same_indexed_repr(void);
-void test_nghttp2_hd_inflate_indexed(void);
-void test_nghttp2_hd_inflate_indname_noinc(void);
-void test_nghttp2_hd_inflate_indname_inc(void);
-void test_nghttp2_hd_inflate_indname_inc_eviction(void);
-void test_nghttp2_hd_inflate_newname_noinc(void);
-void test_nghttp2_hd_inflate_newname_inc(void);
-void test_nghttp2_hd_inflate_clearall_inc(void);
-void test_nghttp2_hd_inflate_zero_length_huffman(void);
-void test_nghttp2_hd_inflate_expect_table_size_update(void);
-void test_nghttp2_hd_inflate_unexpected_table_size_update(void);
-void test_nghttp2_hd_ringbuf_reserve(void);
-void test_nghttp2_hd_change_table_size(void);
-void test_nghttp2_hd_deflate_inflate(void);
-void test_nghttp2_hd_no_index(void);
-void test_nghttp2_hd_deflate_bound(void);
-void test_nghttp2_hd_public_api(void);
-void test_nghttp2_hd_deflate_hd_vec(void);
-void test_nghttp2_hd_decode_length(void);
-void test_nghttp2_hd_huff_encode(void);
-void test_nghttp2_hd_huff_decode(void);
+#define MUNIT_ENABLE_ASSERT_ALIASES
+
+#include "munit.h"
+
+extern const MunitSuite hd_suite;
+
+munit_void_test_decl(test_nghttp2_hd_deflate);
+munit_void_test_decl(test_nghttp2_hd_deflate_same_indexed_repr);
+munit_void_test_decl(test_nghttp2_hd_inflate_indexed);
+munit_void_test_decl(test_nghttp2_hd_inflate_indname_noinc);
+munit_void_test_decl(test_nghttp2_hd_inflate_indname_inc);
+munit_void_test_decl(test_nghttp2_hd_inflate_indname_inc_eviction);
+munit_void_test_decl(test_nghttp2_hd_inflate_newname_noinc);
+munit_void_test_decl(test_nghttp2_hd_inflate_newname_inc);
+munit_void_test_decl(test_nghttp2_hd_inflate_clearall_inc);
+munit_void_test_decl(test_nghttp2_hd_inflate_zero_length_huffman);
+munit_void_test_decl(test_nghttp2_hd_inflate_expect_table_size_update);
+munit_void_test_decl(test_nghttp2_hd_inflate_unexpected_table_size_update);
+munit_void_test_decl(test_nghttp2_hd_ringbuf_reserve);
+munit_void_test_decl(test_nghttp2_hd_change_table_size);
+munit_void_test_decl(test_nghttp2_hd_deflate_inflate);
+munit_void_test_decl(test_nghttp2_hd_no_index);
+munit_void_test_decl(test_nghttp2_hd_deflate_bound);
+munit_void_test_decl(test_nghttp2_hd_public_api);
+munit_void_test_decl(test_nghttp2_hd_deflate_hd_vec);
+munit_void_test_decl(test_nghttp2_hd_decode_length);
+munit_void_test_decl(test_nghttp2_hd_huff_encode);
+munit_void_test_decl(test_nghttp2_hd_huff_decode);
 
 #endif /* NGHTTP2_HD_TEST_H */
diff --git a/tests/nghttp2_helper_test.c b/tests/nghttp2_helper_test.c
index 377f49d..8c3f116 100644
--- a/tests/nghttp2_helper_test.c
+++ b/tests/nghttp2_helper_test.c
@@ -26,10 +26,22 @@
 
 #include <stdio.h>
 
-#include <CUnit/CUnit.h>
+#include "munit.h"
 
 #include "nghttp2_helper.h"
 
+static const MunitTest tests[] = {
+    munit_void_test(test_nghttp2_adjust_local_window_size),
+    munit_void_test(test_nghttp2_check_header_name),
+    munit_void_test(test_nghttp2_check_header_value),
+    munit_void_test(test_nghttp2_check_header_value_rfc9113),
+    munit_test_end(),
+};
+
+const MunitSuite helper_suite = {
+    "/helper", tests, NULL, 1, MUNIT_SUITE_OPTION_NONE,
+};
+
 void test_nghttp2_adjust_local_window_size(void) {
   int32_t local_window_size = 100;
   int32_t recv_window_size = 50;
@@ -37,123 +49,132 @@ void test_nghttp2_adjust_local_window_size(void) {
   int32_t delta;
 
   delta = 0;
-  CU_ASSERT(0 == nghttp2_adjust_local_window_size(&local_window_size,
-                                                  &recv_window_size,
-                                                  &recv_reduction, &delta));
-  CU_ASSERT(100 == local_window_size);
-  CU_ASSERT(50 == recv_window_size);
-  CU_ASSERT(0 == recv_reduction);
-  CU_ASSERT(0 == delta);
+  assert_int(0, ==,
+             nghttp2_adjust_local_window_size(&local_window_size,
+                                              &recv_window_size,
+                                              &recv_reduction, &delta));
+  assert_int32(100, ==, local_window_size);
+  assert_int32(50, ==, recv_window_size);
+  assert_int32(0, ==, recv_reduction);
+  assert_int32(0, ==, delta);
 
   delta = 49;
-  CU_ASSERT(0 == nghttp2_adjust_local_window_size(&local_window_size,
-                                                  &recv_window_size,
-                                                  &recv_reduction, &delta));
-  CU_ASSERT(100 == local_window_size);
-  CU_ASSERT(1 == recv_window_size);
-  CU_ASSERT(0 == recv_reduction);
-  CU_ASSERT(49 == delta);
+  assert_int(0, ==,
+             nghttp2_adjust_local_window_size(&local_window_size,
+                                              &recv_window_size,
+                                              &recv_reduction, &delta));
+  assert_int32(100, ==, local_window_size);
+  assert_int32(1, ==, recv_window_size);
+  assert_int32(0, ==, recv_reduction);
+  assert_int32(49, ==, delta);
 
   delta = 1;
-  CU_ASSERT(0 == nghttp2_adjust_local_window_size(&local_window_size,
-                                                  &recv_window_size,
-                                                  &recv_reduction, &delta));
-  CU_ASSERT(100 == local_window_size);
-  CU_ASSERT(0 == recv_window_size);
-  CU_ASSERT(0 == recv_reduction);
-  CU_ASSERT(1 == delta);
+  assert_int(0, ==,
+             nghttp2_adjust_local_window_size(&local_window_size,
+                                              &recv_window_size,
+                                              &recv_reduction, &delta));
+  assert_int32(100, ==, local_window_size);
+  assert_int32(0, ==, recv_window_size);
+  assert_int32(0, ==, recv_reduction);
+  assert_int32(1, ==, delta);
 
   delta = 1;
-  CU_ASSERT(0 == nghttp2_adjust_local_window_size(&local_window_size,
-                                                  &recv_window_size,
-                                                  &recv_reduction, &delta));
-  CU_ASSERT(101 == local_window_size);
-  CU_ASSERT(0 == recv_window_size);
-  CU_ASSERT(0 == recv_reduction);
-  CU_ASSERT(1 == delta);
+  assert_int(0, ==,
+             nghttp2_adjust_local_window_size(&local_window_size,
+                                              &recv_window_size,
+                                              &recv_reduction, &delta));
+  assert_int32(101, ==, local_window_size);
+  assert_int32(0, ==, recv_window_size);
+  assert_int32(0, ==, recv_reduction);
+  assert_int32(1, ==, delta);
 
   delta = -1;
-  CU_ASSERT(0 == nghttp2_adjust_local_window_size(&local_window_size,
-                                                  &recv_window_size,
-                                                  &recv_reduction, &delta));
-  CU_ASSERT(100 == local_window_size);
-  CU_ASSERT(-1 == recv_window_size);
-  CU_ASSERT(1 == recv_reduction);
-  CU_ASSERT(0 == delta);
+  assert_int(0, ==,
+             nghttp2_adjust_local_window_size(&local_window_size,
+                                              &recv_window_size,
+                                              &recv_reduction, &delta));
+  assert_int32(100, ==, local_window_size);
+  assert_int32(-1, ==, recv_window_size);
+  assert_int32(1, ==, recv_reduction);
+  assert_int32(0, ==, delta);
 
   delta = 1;
-  CU_ASSERT(0 == nghttp2_adjust_local_window_size(&local_window_size,
-                                                  &recv_window_size,
-                                                  &recv_reduction, &delta));
-  CU_ASSERT(101 == local_window_size);
-  CU_ASSERT(0 == recv_window_size);
-  CU_ASSERT(0 == recv_reduction);
-  CU_ASSERT(0 == delta);
+  assert_int(0, ==,
+             nghttp2_adjust_local_window_size(&local_window_size,
+                                              &recv_window_size,
+                                              &recv_reduction, &delta));
+  assert_int32(101, ==, local_window_size);
+  assert_int32(0, ==, recv_window_size);
+  assert_int32(0, ==, recv_reduction);
+  assert_int32(0, ==, delta);
 
   delta = 100;
-  CU_ASSERT(0 == nghttp2_adjust_local_window_size(&local_window_size,
-                                                  &recv_window_size,
-                                                  &recv_reduction, &delta));
-  CU_ASSERT(201 == local_window_size);
-  CU_ASSERT(0 == recv_window_size);
-  CU_ASSERT(0 == recv_reduction);
-  CU_ASSERT(100 == delta);
+  assert_int(0, ==,
+             nghttp2_adjust_local_window_size(&local_window_size,
+                                              &recv_window_size,
+                                              &recv_reduction, &delta));
+  assert_int32(201, ==, local_window_size);
+  assert_int32(0, ==, recv_window_size);
+  assert_int32(0, ==, recv_reduction);
+  assert_int32(100, ==, delta);
 
   delta = -3;
-  CU_ASSERT(0 == nghttp2_adjust_local_window_size(&local_window_size,
-                                                  &recv_window_size,
-                                                  &recv_reduction, &delta));
-  CU_ASSERT(198 == local_window_size);
-  CU_ASSERT(-3 == recv_window_size);
-  CU_ASSERT(3 == recv_reduction);
-  CU_ASSERT(0 == delta);
+  assert_int(0, ==,
+             nghttp2_adjust_local_window_size(&local_window_size,
+                                              &recv_window_size,
+                                              &recv_reduction, &delta));
+  assert_int32(198, ==, local_window_size);
+  assert_int32(-3, ==, recv_window_size);
+  assert_int32(3, ==, recv_reduction);
+  assert_int32(0, ==, delta);
 
   recv_window_size += 3;
 
   delta = 3;
-  CU_ASSERT(0 == nghttp2_adjust_local_window_size(&local_window_size,
-                                                  &recv_window_size,
-                                                  &recv_reduction, &delta));
-  CU_ASSERT(201 == local_window_size);
-  CU_ASSERT(3 == recv_window_size);
-  CU_ASSERT(0 == recv_reduction);
-  CU_ASSERT(0 == delta);
+  assert_int(0, ==,
+             nghttp2_adjust_local_window_size(&local_window_size,
+                                              &recv_window_size,
+                                              &recv_reduction, &delta));
+  assert_int32(201, ==, local_window_size);
+  assert_int32(3, ==, recv_window_size);
+  assert_int32(0, ==, recv_reduction);
+  assert_int32(0, ==, delta);
 
   local_window_size = 100;
   recv_window_size = 50;
   recv_reduction = 0;
   delta = INT32_MAX;
-  CU_ASSERT(NGHTTP2_ERR_FLOW_CONTROL ==
-            nghttp2_adjust_local_window_size(&local_window_size,
-                                             &recv_window_size, &recv_reduction,
-                                             &delta));
-  CU_ASSERT(100 == local_window_size);
-  CU_ASSERT(50 == recv_window_size);
-  CU_ASSERT(0 == recv_reduction);
-  CU_ASSERT(INT32_MAX == delta);
+  assert_int(NGHTTP2_ERR_FLOW_CONTROL, ==,
+             nghttp2_adjust_local_window_size(&local_window_size,
+                                              &recv_window_size,
+                                              &recv_reduction, &delta));
+  assert_int32(100, ==, local_window_size);
+  assert_int32(50, ==, recv_window_size);
+  assert_int32(0, ==, recv_reduction);
+  assert_int32(INT32_MAX, ==, delta);
 
   delta = INT32_MIN;
-  CU_ASSERT(NGHTTP2_ERR_FLOW_CONTROL ==
-            nghttp2_adjust_local_window_size(&local_window_size,
-                                             &recv_window_size, &recv_reduction,
-                                             &delta));
-  CU_ASSERT(100 == local_window_size);
-  CU_ASSERT(50 == recv_window_size);
-  CU_ASSERT(0 == recv_reduction);
-  CU_ASSERT(INT32_MIN == delta);
+  assert_int(NGHTTP2_ERR_FLOW_CONTROL, ==,
+             nghttp2_adjust_local_window_size(&local_window_size,
+                                              &recv_window_size,
+                                              &recv_reduction, &delta));
+  assert_int32(100, ==, local_window_size);
+  assert_int32(50, ==, recv_window_size);
+  assert_int32(0, ==, recv_reduction);
+  assert_int32(INT32_MIN, ==, delta);
 }
 
 #define check_header_name(S)                                                   \
   nghttp2_check_header_name((const uint8_t *)S, sizeof(S) - 1)
 
 void test_nghttp2_check_header_name(void) {
-  CU_ASSERT(check_header_name(":path"));
-  CU_ASSERT(check_header_name("path"));
-  CU_ASSERT(check_header_name("!#$%&'*+-.^_`|~"));
-  CU_ASSERT(!check_header_name(":PATH"));
-  CU_ASSERT(!check_header_name("path:"));
-  CU_ASSERT(!check_header_name(""));
-  CU_ASSERT(!check_header_name(":"));
+  assert_true(check_header_name(":path"));
+  assert_true(check_header_name("path"));
+  assert_true(check_header_name("!#$%&'*+-.^_`|~"));
+  assert_false(check_header_name(":PATH"));
+  assert_false(check_header_name("path:"));
+  assert_false(check_header_name(""));
+  assert_false(check_header_name(":"));
 }
 
 #define check_header_value(S)                                                  \
@@ -164,13 +185,13 @@ void test_nghttp2_check_header_value(void) {
   uint8_t badval1[] = {'a', 0x1fu, 'b'};
   uint8_t badval2[] = {'a', 0x7fu, 'b'};
 
-  CU_ASSERT(check_header_value(" !|}~"));
-  CU_ASSERT(check_header_value(goodval));
-  CU_ASSERT(!check_header_value(badval1));
-  CU_ASSERT(!check_header_value(badval2));
-  CU_ASSERT(check_header_value(""));
-  CU_ASSERT(check_header_value(" "));
-  CU_ASSERT(check_header_value("\t"));
+  assert_true(check_header_value(" !|}~"));
+  assert_true(check_header_value(goodval));
+  assert_false(check_header_value(badval1));
+  assert_false(check_header_value(badval2));
+  assert_true(check_header_value(""));
+  assert_true(check_header_value(" "));
+  assert_true(check_header_value("\t"));
 }
 
 #define check_header_value_rfc9113(S)                                          \
@@ -181,15 +202,15 @@ void test_nghttp2_check_header_value_rfc9113(void) {
   uint8_t badval1[] = {'a', 0x1fu, 'b'};
   uint8_t badval2[] = {'a', 0x7fu, 'b'};
 
-  CU_ASSERT(check_header_value_rfc9113("!|}~"));
-  CU_ASSERT(!check_header_value_rfc9113(" !|}~"));
-  CU_ASSERT(!check_header_value_rfc9113("!|}~ "));
-  CU_ASSERT(!check_header_value_rfc9113("\t!|}~"));
-  CU_ASSERT(!check_header_value_rfc9113("!|}~\t"));
-  CU_ASSERT(check_header_value_rfc9113(goodval));
-  CU_ASSERT(!check_header_value_rfc9113(badval1));
-  CU_ASSERT(!check_header_value_rfc9113(badval2));
-  CU_ASSERT(check_header_value_rfc9113(""));
-  CU_ASSERT(!check_header_value_rfc9113(" "));
-  CU_ASSERT(!check_header_value_rfc9113("\t"));
+  assert_true(check_header_value_rfc9113("!|}~"));
+  assert_false(check_header_value_rfc9113(" !|}~"));
+  assert_false(check_header_value_rfc9113("!|}~ "));
+  assert_false(check_header_value_rfc9113("\t!|}~"));
+  assert_false(check_header_value_rfc9113("!|}~\t"));
+  assert_true(check_header_value_rfc9113(goodval));
+  assert_false(check_header_value_rfc9113(badval1));
+  assert_false(check_header_value_rfc9113(badval2));
+  assert_true(check_header_value_rfc9113(""));
+  assert_false(check_header_value_rfc9113(" "));
+  assert_false(check_header_value_rfc9113("\t"));
 }
diff --git a/tests/nghttp2_helper_test.h b/tests/nghttp2_helper_test.h
index 8790dcf..b81c7b3 100644
--- a/tests/nghttp2_helper_test.h
+++ b/tests/nghttp2_helper_test.h
@@ -29,9 +29,15 @@
 #  include <config.h>
 #endif /* HAVE_CONFIG_H */
 
-void test_nghttp2_adjust_local_window_size(void);
-void test_nghttp2_check_header_name(void);
-void test_nghttp2_check_header_value(void);
-void test_nghttp2_check_header_value_rfc9113(void);
+#define MUNIT_ENABLE_ASSERT_ALIASES
+
+#include "munit.h"
+
+extern const MunitSuite helper_suite;
+
+munit_void_test_decl(test_nghttp2_adjust_local_window_size);
+munit_void_test_decl(test_nghttp2_check_header_name);
+munit_void_test_decl(test_nghttp2_check_header_value);
+munit_void_test_decl(test_nghttp2_check_header_value_rfc9113);
 
 #endif /* NGHTTP2_HELPER_TEST_H */
diff --git a/tests/nghttp2_http_test.c b/tests/nghttp2_http_test.c
index 19f345b..86880d5 100644
--- a/tests/nghttp2_http_test.c
+++ b/tests/nghttp2_http_test.c
@@ -28,11 +28,20 @@
 #include <stdio.h>
 #include <assert.h>
 
-#include <CUnit/CUnit.h>
+#include "munit.h"
 
 #include "nghttp2_http.h"
 #include "nghttp2_test_helper.h"
 
+static const MunitTest tests[] = {
+    munit_void_test(test_nghttp2_http_parse_priority),
+    munit_test_end(),
+};
+
+const MunitSuite http_suite = {
+    "/http", tests, NULL, 1, MUNIT_SUITE_OPTION_NONE,
+};
+
 void test_nghttp2_http_parse_priority(void) {
   int rv;
 
@@ -42,9 +51,9 @@ void test_nghttp2_http_parse_priority(void) {
 
     rv = nghttp2_http_parse_priority(&pri, v, sizeof(v) - 1);
 
-    CU_ASSERT(0 == rv);
-    CU_ASSERT((uint32_t)-1 == pri.urgency);
-    CU_ASSERT(-1 == pri.inc);
+    assert_int(0, ==, rv);
+    assert_uint32((uint32_t)-1, ==, pri.urgency);
+    assert_int(-1, ==, pri.inc);
   }
 
   {
@@ -53,9 +62,9 @@ void test_nghttp2_http_parse_priority(void) {
 
     rv = nghttp2_http_parse_priority(&pri, v, sizeof(v) - 1);
 
-    CU_ASSERT(0 == rv);
-    CU_ASSERT((uint32_t)7 == pri.urgency);
-    CU_ASSERT(1 == pri.inc);
+    assert_int(0, ==, rv);
+    assert_uint32((uint32_t)7, ==, pri.urgency);
+    assert_int(1, ==, pri.inc);
   }
 
   {
@@ -64,9 +73,9 @@ void test_nghttp2_http_parse_priority(void) {
 
     rv = nghttp2_http_parse_priority(&pri, v, sizeof(v) - 1);
 
-    CU_ASSERT(0 == rv);
-    CU_ASSERT((uint32_t)0 == pri.urgency);
-    CU_ASSERT(0 == pri.inc);
+    assert_int(0, ==, rv);
+    assert_uint32((uint32_t)0, ==, pri.urgency);
+    assert_int(0, ==, pri.inc);
   }
 
   {
@@ -75,9 +84,9 @@ void test_nghttp2_http_parse_priority(void) {
 
     rv = nghttp2_http_parse_priority(&pri, v, sizeof(v) - 1);
 
-    CU_ASSERT(0 == rv);
-    CU_ASSERT((uint32_t)3 == pri.urgency);
-    CU_ASSERT(1 == pri.inc);
+    assert_int(0, ==, rv);
+    assert_uint32((uint32_t)3, ==, pri.urgency);
+    assert_int(1, ==, pri.inc);
   }
 
   {
@@ -86,9 +95,9 @@ void test_nghttp2_http_parse_priority(void) {
 
     rv = nghttp2_http_parse_priority(&pri, v, sizeof(v) - 1);
 
-    CU_ASSERT(0 == rv);
-    CU_ASSERT((uint32_t)6 == pri.urgency);
-    CU_ASSERT(0 == pri.inc);
+    assert_int(0, ==, rv);
+    assert_uint32((uint32_t)6, ==, pri.urgency);
+    assert_int(0, ==, pri.inc);
   }
 
   {
@@ -97,7 +106,7 @@ void test_nghttp2_http_parse_priority(void) {
 
     rv = nghttp2_http_parse_priority(&pri, v, sizeof(v) - 1);
 
-    CU_ASSERT(NGHTTP2_ERR_INVALID_ARGUMENT == rv);
+    assert_int(NGHTTP2_ERR_INVALID_ARGUMENT, ==, rv);
   }
 
   {
@@ -106,7 +115,7 @@ void test_nghttp2_http_parse_priority(void) {
 
     rv = nghttp2_http_parse_priority(&pri, v, sizeof(v) - 1);
 
-    CU_ASSERT(NGHTTP2_ERR_INVALID_ARGUMENT == rv);
+    assert_int(NGHTTP2_ERR_INVALID_ARGUMENT, ==, rv);
   }
 
   {
@@ -115,7 +124,7 @@ void test_nghttp2_http_parse_priority(void) {
 
     rv = nghttp2_http_parse_priority(&pri, v, sizeof(v) - 1);
 
-    CU_ASSERT(NGHTTP2_ERR_INVALID_ARGUMENT == rv);
+    assert_int(NGHTTP2_ERR_INVALID_ARGUMENT, ==, rv);
   }
 
   {
@@ -124,7 +133,7 @@ void test_nghttp2_http_parse_priority(void) {
 
     rv = nghttp2_http_parse_priority(&pri, v, sizeof(v) - 1);
 
-    CU_ASSERT(NGHTTP2_ERR_INVALID_ARGUMENT == rv);
+    assert_int(NGHTTP2_ERR_INVALID_ARGUMENT, ==, rv);
   }
 
   {
@@ -133,9 +142,9 @@ void test_nghttp2_http_parse_priority(void) {
 
     rv = nghttp2_http_parse_priority(&pri, v, sizeof(v) - 1);
 
-    CU_ASSERT(0 == rv);
-    CU_ASSERT((uint32_t)-1 == pri.urgency);
-    CU_ASSERT(1 == pri.inc);
+    assert_int(0, ==, rv);
+    assert_uint32((uint32_t)-1, ==, pri.urgency);
+    assert_int(1, ==, pri.inc);
   }
 
   {
@@ -144,7 +153,7 @@ void test_nghttp2_http_parse_priority(void) {
 
     rv = nghttp2_http_parse_priority(&pri, v, sizeof(v) - 1);
 
-    CU_ASSERT(NGHTTP2_ERR_INVALID_ARGUMENT == rv);
+    assert_int(NGHTTP2_ERR_INVALID_ARGUMENT, ==, rv);
   }
 
   {
@@ -153,7 +162,7 @@ void test_nghttp2_http_parse_priority(void) {
 
     rv = nghttp2_http_parse_priority(&pri, v, sizeof(v) - 1);
 
-    CU_ASSERT(NGHTTP2_ERR_INVALID_ARGUMENT == rv);
+    assert_int(NGHTTP2_ERR_INVALID_ARGUMENT, ==, rv);
   }
 
   {
@@ -162,7 +171,7 @@ void test_nghttp2_http_parse_priority(void) {
 
     rv = nghttp2_http_parse_priority(&pri, v, sizeof(v) - 1);
 
-    CU_ASSERT(NGHTTP2_ERR_INVALID_ARGUMENT == rv);
+    assert_int(NGHTTP2_ERR_INVALID_ARGUMENT, ==, rv);
   }
 
   {
@@ -171,7 +180,7 @@ void test_nghttp2_http_parse_priority(void) {
 
     rv = nghttp2_http_parse_priority(&pri, v, sizeof(v) - 1);
 
-    CU_ASSERT(NGHTTP2_ERR_INVALID_ARGUMENT == rv);
+    assert_int(NGHTTP2_ERR_INVALID_ARGUMENT, ==, rv);
   }
 
   {
@@ -180,7 +189,7 @@ void test_nghttp2_http_parse_priority(void) {
 
     rv = nghttp2_http_parse_priority(&pri, v, sizeof(v) - 1);
 
-    CU_ASSERT(NGHTTP2_ERR_INVALID_ARGUMENT == rv);
+    assert_int(NGHTTP2_ERR_INVALID_ARGUMENT, ==, rv);
   }
 
   {
@@ -190,9 +199,9 @@ void test_nghttp2_http_parse_priority(void) {
 
     rv = nghttp2_http_parse_priority(&pri, v, sizeof(v) - 1);
 
-    CU_ASSERT(0 == rv);
-    CU_ASSERT((uint32_t)2 == pri.urgency);
-    CU_ASSERT(1 == pri.inc);
+    assert_int(0, ==, rv);
+    assert_uint32((uint32_t)2, ==, pri.urgency);
+    assert_int(1, ==, pri.inc);
   }
 
   {
@@ -201,6 +210,6 @@ void test_nghttp2_http_parse_priority(void) {
 
     rv = nghttp2_http_parse_priority(&pri, v, sizeof(v));
 
-    CU_ASSERT(NGHTTP2_ERR_INVALID_ARGUMENT == rv);
+    assert_int(NGHTTP2_ERR_INVALID_ARGUMENT, ==, rv);
   }
 }
diff --git a/tests/nghttp2_http_test.h b/tests/nghttp2_http_test.h
index e616cdc..b258905 100644
--- a/tests/nghttp2_http_test.h
+++ b/tests/nghttp2_http_test.h
@@ -30,6 +30,12 @@
 #  include <config.h>
 #endif /* HAVE_CONFIG_H */
 
-void test_nghttp2_http_parse_priority(void);
+#define MUNIT_ENABLE_ASSERT_ALIASES
+
+#include "munit.h"
+
+extern const MunitSuite http_suite;
+
+munit_void_test_decl(test_nghttp2_http_parse_priority);
 
 #endif /* NGHTTP2_HTTP_TEST_H */
diff --git a/tests/nghttp2_map_test.c b/tests/nghttp2_map_test.c
index 7ba9bd6..3b79b8a 100644
--- a/tests/nghttp2_map_test.c
+++ b/tests/nghttp2_map_test.c
@@ -27,10 +27,22 @@
 
 #include <stdio.h>
 
-#include <CUnit/CUnit.h>
+#include "munit.h"
 
 #include "nghttp2_map.h"
 
+static const MunitTest tests[] = {
+    munit_void_test(test_nghttp2_map),
+    munit_void_test(test_nghttp2_map_functional),
+    munit_void_test(test_nghttp2_map_each_free),
+    munit_void_test(test_nghttp2_map_clear),
+    munit_test_end(),
+};
+
+const MunitSuite map_suite = {
+    "/map", tests, NULL, 1, MUNIT_SUITE_OPTION_NONE,
+};
+
 typedef struct strentry {
   nghttp2_map_key_type key;
   const char *str;
@@ -53,43 +65,43 @@ void test_nghttp2_map(void) {
   strentry_init(&baz, 3, "baz");
   strentry_init(&shrubbery, 4, "shrubbery");
 
-  CU_ASSERT(0 == nghttp2_map_insert(&map, foo.key, &foo));
-  CU_ASSERT(strcmp("foo", ((strentry *)nghttp2_map_find(&map, 1))->str) == 0);
-  CU_ASSERT(1 == nghttp2_map_size(&map));
+  assert_int(0, ==, nghttp2_map_insert(&map, foo.key, &foo));
+  assert_string_equal("foo", ((strentry *)nghttp2_map_find(&map, 1))->str);
+  assert_size(1, ==, nghttp2_map_size(&map));
 
-  CU_ASSERT(NGHTTP2_ERR_INVALID_ARGUMENT ==
-            nghttp2_map_insert(&map, FOO.key, &FOO));
+  assert_int(NGHTTP2_ERR_INVALID_ARGUMENT, ==,
+             nghttp2_map_insert(&map, FOO.key, &FOO));
 
-  CU_ASSERT(1 == nghttp2_map_size(&map));
-  CU_ASSERT(strcmp("foo", ((strentry *)nghttp2_map_find(&map, 1))->str) == 0);
+  assert_size(1, ==, nghttp2_map_size(&map));
+  assert_string_equal("foo", ((strentry *)nghttp2_map_find(&map, 1))->str);
 
-  CU_ASSERT(0 == nghttp2_map_insert(&map, bar.key, &bar));
-  CU_ASSERT(2 == nghttp2_map_size(&map));
+  assert_int(0, ==, nghttp2_map_insert(&map, bar.key, &bar));
+  assert_size(2, ==, nghttp2_map_size(&map));
 
-  CU_ASSERT(0 == nghttp2_map_insert(&map, baz.key, &baz));
-  CU_ASSERT(3 == nghttp2_map_size(&map));
+  assert_int(0, ==, nghttp2_map_insert(&map, baz.key, &baz));
+  assert_size(3, ==, nghttp2_map_size(&map));
 
-  CU_ASSERT(0 == nghttp2_map_insert(&map, shrubbery.key, &shrubbery));
-  CU_ASSERT(4 == nghttp2_map_size(&map));
+  assert_int(0, ==, nghttp2_map_insert(&map, shrubbery.key, &shrubbery));
+  assert_size(4, ==, nghttp2_map_size(&map));
 
-  CU_ASSERT(strcmp("baz", ((strentry *)nghttp2_map_find(&map, 3))->str) == 0);
+  assert_string_equal("baz", ((strentry *)nghttp2_map_find(&map, 3))->str);
 
   nghttp2_map_remove(&map, 3);
-  CU_ASSERT(3 == nghttp2_map_size(&map));
-  CU_ASSERT(NULL == nghttp2_map_find(&map, 3));
+  assert_size(3, ==, nghttp2_map_size(&map));
+  assert_null(nghttp2_map_find(&map, 3));
 
   nghttp2_map_remove(&map, 1);
-  CU_ASSERT(2 == nghttp2_map_size(&map));
-  CU_ASSERT(NULL == nghttp2_map_find(&map, 1));
+  assert_size(2, ==, nghttp2_map_size(&map));
+  assert_null(nghttp2_map_find(&map, 1));
 
   /* Erasing non-existent entry */
   nghttp2_map_remove(&map, 1);
-  CU_ASSERT(2 == nghttp2_map_size(&map));
-  CU_ASSERT(NULL == nghttp2_map_find(&map, 1));
+  assert_size(2, ==, nghttp2_map_size(&map));
+  assert_null(nghttp2_map_find(&map, 1));
 
-  CU_ASSERT(strcmp("bar", ((strentry *)nghttp2_map_find(&map, 2))->str) == 0);
-  CU_ASSERT(strcmp("shrubbery", ((strentry *)nghttp2_map_find(&map, 4))->str) ==
-            0);
+  assert_string_equal("bar", ((strentry *)nghttp2_map_find(&map, 2))->str);
+  assert_string_equal("shrubbery",
+                      ((strentry *)nghttp2_map_find(&map, 4))->str);
 
   nghttp2_map_free(&map);
 }
@@ -129,21 +141,21 @@ void test_nghttp2_map_functional(void) {
   shuffle(order, NUM_ENT);
   for (i = 0; i < NUM_ENT; ++i) {
     ent = &arr[order[i] - 1];
-    CU_ASSERT(0 == nghttp2_map_insert(&map, ent->key, ent));
+    assert_int(0, ==, nghttp2_map_insert(&map, ent->key, ent));
   }
 
-  CU_ASSERT(NUM_ENT == nghttp2_map_size(&map));
+  assert_size(NUM_ENT, ==, nghttp2_map_size(&map));
 
   /* traverse */
   nghttp2_map_each(&map, eachfun, NULL);
   /* find */
   shuffle(order, NUM_ENT);
   for (i = 0; i < NUM_ENT; ++i) {
-    CU_ASSERT(NULL != nghttp2_map_find(&map, (nghttp2_map_key_type)order[i]));
+    assert_not_null(nghttp2_map_find(&map, (nghttp2_map_key_type)order[i]));
   }
   /* remove */
   for (i = 0; i < NUM_ENT; ++i) {
-    CU_ASSERT(0 == nghttp2_map_remove(&map, (nghttp2_map_key_type)order[i]));
+    assert_int(0, ==, nghttp2_map_remove(&map, (nghttp2_map_key_type)order[i]));
   }
 
   /* each_free (but no op function for testing purpose) */
@@ -153,7 +165,7 @@ void test_nghttp2_map_functional(void) {
   /* insert once again */
   for (i = 0; i < NUM_ENT; ++i) {
     ent = &arr[i];
-    CU_ASSERT(0 == nghttp2_map_insert(&map, ent->key, ent));
+    assert_int(0, ==, nghttp2_map_insert(&map, ent->key, ent));
   }
   nghttp2_map_each_free(&map, eachfun, NULL);
   nghttp2_map_free(&map);
@@ -198,11 +210,11 @@ void test_nghttp2_map_clear(void) {
 
   nghttp2_map_init(&map, mem);
 
-  CU_ASSERT(0 == nghttp2_map_insert(&map, foo.key, &foo));
+  assert_int(0, ==, nghttp2_map_insert(&map, foo.key, &foo));
 
   nghttp2_map_clear(&map);
 
-  CU_ASSERT(0 == nghttp2_map_size(&map));
+  assert_size(0, ==, nghttp2_map_size(&map));
 
   nghttp2_map_free(&map);
 }
diff --git a/tests/nghttp2_map_test.h b/tests/nghttp2_map_test.h
index 235624d..ba06175 100644
--- a/tests/nghttp2_map_test.h
+++ b/tests/nghttp2_map_test.h
@@ -30,9 +30,15 @@
 #  include <config.h>
 #endif /* HAVE_CONFIG_H */
 
-void test_nghttp2_map(void);
-void test_nghttp2_map_functional(void);
-void test_nghttp2_map_each_free(void);
-void test_nghttp2_map_clear(void);
+#define MUNIT_ENABLE_ASSERT_ALIASES
+
+#include "munit.h"
+
+extern const MunitSuite map_suite;
+
+munit_void_test_decl(test_nghttp2_map);
+munit_void_test_decl(test_nghttp2_map_functional);
+munit_void_test_decl(test_nghttp2_map_each_free);
+munit_void_test_decl(test_nghttp2_map_clear);
 
 #endif /* NGHTTP2_MAP_TEST_H */
diff --git a/tests/nghttp2_pq_test.c b/tests/nghttp2_pq_test.c
index 90db26d..aa84af1 100644
--- a/tests/nghttp2_pq_test.c
+++ b/tests/nghttp2_pq_test.c
@@ -26,10 +26,19 @@
 
 #include <stdio.h>
 
-#include <CUnit/CUnit.h>
-
 #include "nghttp2_pq.h"
 
+static const MunitTest tests[] = {
+    munit_void_test(test_nghttp2_pq),
+    munit_void_test(test_nghttp2_pq_update),
+    munit_void_test(test_nghttp2_pq_remove),
+    munit_test_end(),
+};
+
+const MunitSuite pq_suite = {
+    "/pq", tests, NULL, 1, MUNIT_SUITE_OPTION_NONE,
+};
+
 typedef struct {
   nghttp2_pq_entry ent;
   const char *s;
@@ -59,59 +68,59 @@ void test_nghttp2_pq(void) {
   string_entry *top;
 
   nghttp2_pq_init(&pq, pq_less, nghttp2_mem_default());
-  CU_ASSERT(nghttp2_pq_empty(&pq));
-  CU_ASSERT(0 == nghttp2_pq_size(&pq));
-  CU_ASSERT(0 == nghttp2_pq_push(&pq, &string_entry_new("foo")->ent));
-  CU_ASSERT(0 == nghttp2_pq_empty(&pq));
-  CU_ASSERT(1 == nghttp2_pq_size(&pq));
+  assert_true(nghttp2_pq_empty(&pq));
+  assert_size(0, ==, nghttp2_pq_size(&pq));
+  assert_int(0, ==, nghttp2_pq_push(&pq, &string_entry_new("foo")->ent));
+  assert_false(nghttp2_pq_empty(&pq));
+  assert_size(1, ==, nghttp2_pq_size(&pq));
   top = (string_entry *)nghttp2_pq_top(&pq);
-  CU_ASSERT(strcmp("foo", top->s) == 0);
-  CU_ASSERT(0 == nghttp2_pq_push(&pq, &string_entry_new("bar")->ent));
+  assert_string_equal("foo", top->s);
+  assert_int(0, ==, nghttp2_pq_push(&pq, &string_entry_new("bar")->ent));
   top = (string_entry *)nghttp2_pq_top(&pq);
-  CU_ASSERT(strcmp("bar", top->s) == 0);
-  CU_ASSERT(0 == nghttp2_pq_push(&pq, &string_entry_new("baz")->ent));
+  assert_string_equal("bar", top->s);
+  assert_int(0, ==, nghttp2_pq_push(&pq, &string_entry_new("baz")->ent));
   top = (string_entry *)nghttp2_pq_top(&pq);
-  CU_ASSERT(strcmp("bar", top->s) == 0);
-  CU_ASSERT(0 == nghttp2_pq_push(&pq, &string_entry_new("C")->ent));
-  CU_ASSERT(4 == nghttp2_pq_size(&pq));
+  assert_string_equal("bar", top->s);
+  assert_int(0, ==, nghttp2_pq_push(&pq, &string_entry_new("C")->ent));
+  assert_size(4, ==, nghttp2_pq_size(&pq));
 
   top = (string_entry *)nghttp2_pq_top(&pq);
-  CU_ASSERT(strcmp("C", top->s) == 0);
+  assert_string_equal("C", top->s);
   string_entry_del(top);
   nghttp2_pq_pop(&pq);
 
-  CU_ASSERT(3 == nghttp2_pq_size(&pq));
+  assert_size(3, ==, nghttp2_pq_size(&pq));
 
   top = (string_entry *)nghttp2_pq_top(&pq);
-  CU_ASSERT(strcmp("bar", top->s) == 0);
+  assert_string_equal("bar", top->s);
   nghttp2_pq_pop(&pq);
   string_entry_del(top);
 
   top = (string_entry *)nghttp2_pq_top(&pq);
-  CU_ASSERT(strcmp("baz", top->s) == 0);
+  assert_string_equal("baz", top->s);
   nghttp2_pq_pop(&pq);
   string_entry_del(top);
 
   top = (string_entry *)nghttp2_pq_top(&pq);
-  CU_ASSERT(strcmp("foo", top->s) == 0);
+  assert_string_equal("foo", top->s);
   nghttp2_pq_pop(&pq);
   string_entry_del(top);
 
-  CU_ASSERT(nghttp2_pq_empty(&pq));
-  CU_ASSERT(0 == nghttp2_pq_size(&pq));
-  CU_ASSERT(NULL == nghttp2_pq_top(&pq));
+  assert_true(nghttp2_pq_empty(&pq));
+  assert_size(0, ==, nghttp2_pq_size(&pq));
+  assert_null(nghttp2_pq_top(&pq));
 
   /* Add bunch of entry to see realloc works */
   for (i = 0; i < 10000; ++i) {
-    CU_ASSERT(0 == nghttp2_pq_push(&pq, &string_entry_new("foo")->ent));
-    CU_ASSERT((size_t)(i + 1) == nghttp2_pq_size(&pq));
+    assert_int(0, ==, nghttp2_pq_push(&pq, &string_entry_new("foo")->ent));
+    assert_size((size_t)(i + 1), ==, nghttp2_pq_size(&pq));
   }
   for (i = 10000; i > 0; --i) {
     top = (string_entry *)nghttp2_pq_top(&pq);
-    CU_ASSERT(NULL != top);
+    assert_not_null(top);
     nghttp2_pq_pop(&pq);
     string_entry_del(top);
-    CU_ASSERT((size_t)(i - 1) == nghttp2_pq_size(&pq));
+    assert_size((size_t)(i - 1), ==, nghttp2_pq_size(&pq));
   }
 
   nghttp2_pq_free(&pq);
@@ -160,7 +169,7 @@ void test_nghttp2_pq_update(void) {
 
   for (i = 0; i < (int)(sizeof(nodes) / sizeof(nodes[0])); ++i) {
     nd = (node *)nghttp2_pq_top(&pq);
-    CU_ASSERT(ans[i] == nd->key);
+    assert_int(ans[i], ==, nd->key);
     nghttp2_pq_pop(&pq);
   }
 
@@ -180,8 +189,8 @@ static void check_nodes(nghttp2_pq *pq, size_t n, int *ans_key, int *ans_val) {
   size_t i;
   for (i = 0; i < n; ++i) {
     node *nd = (node *)nghttp2_pq_top(pq);
-    CU_ASSERT(ans_key[i] == nd->key);
-    CU_ASSERT(ans_val[i] == nd->val);
+    assert_int(ans_key[i], ==, nd->key);
+    assert_int(ans_val[i], ==, nd->val);
     nghttp2_pq_pop(pq);
   }
 }
diff --git a/tests/nghttp2_pq_test.h b/tests/nghttp2_pq_test.h
index 969662a..1386528 100644
--- a/tests/nghttp2_pq_test.h
+++ b/tests/nghttp2_pq_test.h
@@ -29,8 +29,14 @@
 #  include <config.h>
 #endif /* HAVE_CONFIG_H */
 
-void test_nghttp2_pq(void);
-void test_nghttp2_pq_update(void);
-void test_nghttp2_pq_remove(void);
+#define MUNIT_ENABLE_ASSERT_ALIASES
+
+#include "munit.h"
+
+extern const MunitSuite pq_suite;
+
+munit_void_test_decl(test_nghttp2_pq);
+munit_void_test_decl(test_nghttp2_pq_update);
+munit_void_test_decl(test_nghttp2_pq_remove);
 
 #endif /* NGHTTP2_PQ_TEST_H */
diff --git a/tests/nghttp2_queue_test.c b/tests/nghttp2_queue_test.c
index cb993a8..9837b61 100644
--- a/tests/nghttp2_queue_test.c
+++ b/tests/nghttp2_queue_test.c
@@ -26,25 +26,34 @@
 
 #include <stdio.h>
 
-#include <CUnit/CUnit.h>
+#include "munit.h"
 
 #include "nghttp2_queue.h"
 
+static const MunitTest tests[] = {
+    munit_void_test(test_nghttp2_queue),
+    munit_test_end(),
+};
+
+const MunitSuite queue_suite = {
+    "/queue", tests, NULL, 1, MUNIT_SUITE_OPTION_NONE,
+};
+
 void test_nghttp2_queue(void) {
   int ints[] = {1, 2, 3, 4, 5};
   int i;
   nghttp2_queue queue;
   nghttp2_queue_init(&queue);
-  CU_ASSERT(nghttp2_queue_empty(&queue));
+  assert_true(nghttp2_queue_empty(&queue));
   for (i = 0; i < 5; ++i) {
     nghttp2_queue_push(&queue, &ints[i]);
-    CU_ASSERT_EQUAL(ints[0], *(int *)(nghttp2_queue_front(&queue)));
-    CU_ASSERT(!nghttp2_queue_empty(&queue));
+    assert_int(ints[0], ==, *(int *)(nghttp2_queue_front(&queue)));
+    assert_false(nghttp2_queue_empty(&queue));
   }
   for (i = 0; i < 5; ++i) {
-    CU_ASSERT_EQUAL(ints[i], *(int *)(nghttp2_queue_front(&queue)));
+    assert_int(ints[i], ==, *(int *)(nghttp2_queue_front(&queue)));
     nghttp2_queue_pop(&queue);
   }
-  CU_ASSERT(nghttp2_queue_empty(&queue));
+  assert_true(nghttp2_queue_empty(&queue));
   nghttp2_queue_free(&queue);
 }
diff --git a/tests/nghttp2_queue_test.h b/tests/nghttp2_queue_test.h
index 64f8ce8..ba33d38 100644
--- a/tests/nghttp2_queue_test.h
+++ b/tests/nghttp2_queue_test.h
@@ -29,6 +29,12 @@
 #  include <config.h>
 #endif /* HAVE_CONFIG_H */
 
-void test_nghttp2_queue(void);
+#define MUNIT_ENABLE_ASSERT_ALIASES
+
+#include "munit.h"
+
+extern const MunitSuite queue_suite;
+
+munit_void_test_decl(test_nghttp2_queue);
 
 #endif /* NGHTTP2_QUEUE_TEST_H */
diff --git a/tests/nghttp2_ratelim_test.c b/tests/nghttp2_ratelim_test.c
index 6abece9..5be2f22 100644
--- a/tests/nghttp2_ratelim_test.c
+++ b/tests/nghttp2_ratelim_test.c
@@ -26,67 +26,77 @@
 
 #include <stdio.h>
 
-#include <CUnit/CUnit.h>
+#include "munit.h"
 
 #include "nghttp2_ratelim.h"
 
+static const MunitTest tests[] = {
+    munit_void_test(test_nghttp2_ratelim_update),
+    munit_void_test(test_nghttp2_ratelim_drain),
+    munit_test_end(),
+};
+
+const MunitSuite ratelim_suite = {
+    "/ratelim", tests, NULL, 1, MUNIT_SUITE_OPTION_NONE,
+};
+
 void test_nghttp2_ratelim_update(void) {
   nghttp2_ratelim rl;
 
   nghttp2_ratelim_init(&rl, 1000, 21);
 
-  CU_ASSERT(1000 == rl.val);
-  CU_ASSERT(1000 == rl.burst);
-  CU_ASSERT(21 == rl.rate);
-  CU_ASSERT(0 == rl.tstamp);
+  assert_uint64(1000, ==, rl.val);
+  assert_uint64(1000, ==, rl.burst);
+  assert_uint64(21, ==, rl.rate);
+  assert_uint64(0, ==, rl.tstamp);
 
   nghttp2_ratelim_update(&rl, 999);
 
-  CU_ASSERT(1000 == rl.val);
-  CU_ASSERT(999 == rl.tstamp);
+  assert_uint64(1000, ==, rl.val);
+  assert_uint64(999, ==, rl.tstamp);
 
   nghttp2_ratelim_drain(&rl, 100);
 
-  CU_ASSERT(900 == rl.val);
+  assert_uint64(900, ==, rl.val);
 
   nghttp2_ratelim_update(&rl, 1000);
 
-  CU_ASSERT(921 == rl.val);
+  assert_uint64(921, ==, rl.val);
 
   nghttp2_ratelim_update(&rl, 1002);
 
-  CU_ASSERT(963 == rl.val);
+  assert_uint64(963, ==, rl.val);
 
   nghttp2_ratelim_update(&rl, 1004);
 
-  CU_ASSERT(1000 == rl.val);
-  CU_ASSERT(1004 == rl.tstamp);
+  assert_uint64(1000, ==, rl.val);
+  assert_uint64(1004, ==, rl.tstamp);
 
   /* timer skew */
   nghttp2_ratelim_init(&rl, 1000, 21);
   nghttp2_ratelim_update(&rl, 1);
 
-  CU_ASSERT(1000 == rl.val);
+  assert_uint64(1000, ==, rl.val);
 
   nghttp2_ratelim_update(&rl, 0);
 
-  CU_ASSERT(1000 == rl.val);
+  assert_uint64(1000, ==, rl.val);
 
   /* rate * duration overflow */
   nghttp2_ratelim_init(&rl, 1000, 100);
   nghttp2_ratelim_drain(&rl, 999);
 
-  CU_ASSERT(1 == rl.val);
+  assert_uint64(1, ==, rl.val);
 
   nghttp2_ratelim_update(&rl, UINT64_MAX);
 
-  CU_ASSERT(1000 == rl.val);
+  assert_uint64(1000, ==, rl.val);
 
   /* val + rate * duration overflow */
   nghttp2_ratelim_init(&rl, UINT64_MAX - 1, 2);
   nghttp2_ratelim_update(&rl, 1);
 
-  CU_ASSERT(UINT64_MAX - 1 == rl.val);
+  assert_uint64(UINT64_MAX - 1, ==, rl.val);
 }
 
 void test_nghttp2_ratelim_drain(void) {
@@ -94,8 +104,8 @@ void test_nghttp2_ratelim_drain(void) {
 
   nghttp2_ratelim_init(&rl, 100, 7);
 
-  CU_ASSERT(-1 == nghttp2_ratelim_drain(&rl, 101));
-  CU_ASSERT(0 == nghttp2_ratelim_drain(&rl, 51));
-  CU_ASSERT(0 == nghttp2_ratelim_drain(&rl, 49));
-  CU_ASSERT(-1 == nghttp2_ratelim_drain(&rl, 1));
+  assert_int(-1, ==, nghttp2_ratelim_drain(&rl, 101));
+  assert_int(0, ==, nghttp2_ratelim_drain(&rl, 51));
+  assert_int(0, ==, nghttp2_ratelim_drain(&rl, 49));
+  assert_int(-1, ==, nghttp2_ratelim_drain(&rl, 1));
 }
diff --git a/tests/nghttp2_ratelim_test.h b/tests/nghttp2_ratelim_test.h
index 02b2f2b..fe10fe1 100644
--- a/tests/nghttp2_ratelim_test.h
+++ b/tests/nghttp2_ratelim_test.h
@@ -29,7 +29,13 @@
 #  include <config.h>
 #endif /* HAVE_CONFIG_H */
 
-void test_nghttp2_ratelim_update(void);
-void test_nghttp2_ratelim_drain(void);
+#define MUNIT_ENABLE_ASSERT_ALIASES
+
+#include "munit.h"
+
+extern const MunitSuite ratelim_suite;
+
+munit_void_test_decl(test_nghttp2_ratelim_update);
+munit_void_test_decl(test_nghttp2_ratelim_drain);
 
 #endif /* NGHTTP2_RATELIM_TEST_H */
diff --git a/tests/nghttp2_session_test.c b/tests/nghttp2_session_test.c
index 9f6a667..c155102 100644
--- a/tests/nghttp2_session_test.c
+++ b/tests/nghttp2_session_test.c
@@ -27,16 +27,179 @@
 #include <stdio.h>
 #include <assert.h>
 
-#include <CUnit/CUnit.h>
+#include "munit.h"
 
 #include "nghttp2_session.h"
 #include "nghttp2_stream.h"
 #include "nghttp2_net.h"
 #include "nghttp2_helper.h"
 #include "nghttp2_test_helper.h"
+#include "nghttp2_assertion.h"
 #include "nghttp2_priority_spec.h"
 #include "nghttp2_extpri.h"
 
+static const MunitTest tests[] = {
+    munit_void_test(test_nghttp2_session_recv),
+    munit_void_test(test_nghttp2_session_recv_invalid_stream_id),
+    munit_void_test(test_nghttp2_session_recv_invalid_frame),
+    munit_void_test(test_nghttp2_session_recv_eof),
+    munit_void_test(test_nghttp2_session_recv_data),
+    munit_void_test(test_nghttp2_session_recv_data_no_auto_flow_control),
+    munit_void_test(test_nghttp2_session_recv_continuation),
+    munit_void_test(test_nghttp2_session_recv_headers_with_priority),
+    munit_void_test(test_nghttp2_session_recv_headers_with_padding),
+    munit_void_test(test_nghttp2_session_recv_headers_early_response),
+    munit_void_test(test_nghttp2_session_recv_headers_for_closed_stream),
+    munit_void_test(test_nghttp2_session_recv_headers_with_extpri),
+    munit_void_test(test_nghttp2_session_server_recv_push_response),
+    munit_void_test(test_nghttp2_session_recv_premature_headers),
+    munit_void_test(test_nghttp2_session_recv_unknown_frame),
+    munit_void_test(test_nghttp2_session_recv_unexpected_continuation),
+    munit_void_test(test_nghttp2_session_recv_settings_header_table_size),
+    munit_void_test(test_nghttp2_session_recv_too_large_frame_length),
+    munit_void_test(test_nghttp2_session_recv_extension),
+    munit_void_test(test_nghttp2_session_recv_altsvc),
+    munit_void_test(test_nghttp2_session_recv_origin),
+    munit_void_test(test_nghttp2_session_recv_priority_update),
+    munit_void_test(test_nghttp2_session_continue),
+    munit_void_test(test_nghttp2_session_add_frame),
+    munit_void_test(test_nghttp2_session_on_request_headers_received),
+    munit_void_test(test_nghttp2_session_on_response_headers_received),
+    munit_void_test(test_nghttp2_session_on_headers_received),
+    munit_void_test(test_nghttp2_session_on_push_response_headers_received),
+    munit_void_test(test_nghttp2_session_on_priority_received),
+    munit_void_test(test_nghttp2_session_on_rst_stream_received),
+    munit_void_test(test_nghttp2_session_on_settings_received),
+    munit_void_test(test_nghttp2_session_on_push_promise_received),
+    munit_void_test(test_nghttp2_session_on_ping_received),
+    munit_void_test(test_nghttp2_session_on_goaway_received),
+    munit_void_test(test_nghttp2_session_on_window_update_received),
+    munit_void_test(test_nghttp2_session_on_data_received),
+    munit_void_test(test_nghttp2_session_on_data_received_fail_fast),
+    munit_void_test(test_nghttp2_session_on_altsvc_received),
+    munit_void_test(test_nghttp2_session_send_headers_start_stream),
+    munit_void_test(test_nghttp2_session_send_headers_reply),
+    munit_void_test(test_nghttp2_session_send_headers_frame_size_error),
+    munit_void_test(test_nghttp2_session_send_headers_push_reply),
+    munit_void_test(test_nghttp2_session_send_rst_stream),
+    munit_void_test(test_nghttp2_session_send_push_promise),
+    munit_void_test(test_nghttp2_session_is_my_stream_id),
+    munit_void_test(test_nghttp2_session_upgrade2),
+    munit_void_test(test_nghttp2_session_reprioritize_stream),
+    munit_void_test(
+        test_nghttp2_session_reprioritize_stream_with_idle_stream_dep),
+    munit_void_test(test_nghttp2_submit_data),
+    munit_void_test(test_nghttp2_submit_data_read_length_too_large),
+    munit_void_test(test_nghttp2_submit_data_read_length_smallest),
+    munit_void_test(test_nghttp2_submit_data_twice),
+    munit_void_test(test_nghttp2_submit_request_with_data),
+    munit_void_test(test_nghttp2_submit_request_without_data),
+    munit_void_test(test_nghttp2_submit_response_with_data),
+    munit_void_test(test_nghttp2_submit_response_without_data),
+    munit_void_test(test_nghttp2_submit_response_push_response),
+    munit_void_test(test_nghttp2_submit_trailer),
+    munit_void_test(test_nghttp2_submit_headers_start_stream),
+    munit_void_test(test_nghttp2_submit_headers_reply),
+    munit_void_test(test_nghttp2_submit_headers_push_reply),
+    munit_void_test(test_nghttp2_submit_headers),
+    munit_void_test(test_nghttp2_submit_headers_continuation),
+    munit_void_test(test_nghttp2_submit_headers_continuation_extra_large),
+    munit_void_test(test_nghttp2_submit_priority),
+    munit_void_test(test_nghttp2_submit_settings),
+    munit_void_test(test_nghttp2_submit_settings_update_local_window_size),
+    munit_void_test(test_nghttp2_submit_settings_multiple_times),
+    munit_void_test(test_nghttp2_submit_push_promise),
+    munit_void_test(test_nghttp2_submit_window_update),
+    munit_void_test(test_nghttp2_submit_window_update_local_window_size),
+    munit_void_test(test_nghttp2_submit_shutdown_notice),
+    munit_void_test(test_nghttp2_submit_invalid_nv),
+    munit_void_test(test_nghttp2_submit_extension),
+    munit_void_test(test_nghttp2_submit_altsvc),
+    munit_void_test(test_nghttp2_submit_origin),
+    munit_void_test(test_nghttp2_submit_priority_update),
+    munit_void_test(test_nghttp2_submit_rst_stream),
+    munit_void_test(test_nghttp2_session_open_stream),
+    munit_void_test(test_nghttp2_session_open_stream_with_idle_stream_dep),
+    munit_void_test(test_nghttp2_session_get_next_ob_item),
+    munit_void_test(test_nghttp2_session_pop_next_ob_item),
+    munit_void_test(test_nghttp2_session_reply_fail),
+    munit_void_test(test_nghttp2_session_max_concurrent_streams),
+    munit_void_test(test_nghttp2_session_stop_data_with_rst_stream),
+    munit_void_test(test_nghttp2_session_defer_data),
+    munit_void_test(test_nghttp2_session_flow_control),
+    munit_void_test(test_nghttp2_session_flow_control_data_recv),
+    munit_void_test(test_nghttp2_session_flow_control_data_with_padding_recv),
+    munit_void_test(test_nghttp2_session_data_read_temporal_failure),
+    munit_void_test(test_nghttp2_session_on_stream_close),
+    munit_void_test(test_nghttp2_session_on_ctrl_not_send),
+    munit_void_test(test_nghttp2_session_get_outbound_queue_size),
+    munit_void_test(test_nghttp2_session_get_effective_local_window_size),
+    munit_void_test(test_nghttp2_session_set_option),
+    munit_void_test(test_nghttp2_session_data_backoff_by_high_pri_frame),
+    munit_void_test(test_nghttp2_session_pack_data_with_padding),
+    munit_void_test(test_nghttp2_session_pack_headers_with_padding),
+    munit_void_test(test_nghttp2_pack_settings_payload),
+    munit_void_test(test_nghttp2_session_stream_dep_add),
+    munit_void_test(test_nghttp2_session_stream_dep_remove),
+    munit_void_test(test_nghttp2_session_stream_dep_add_subtree),
+    munit_void_test(test_nghttp2_session_stream_dep_remove_subtree),
+    munit_void_test(
+        test_nghttp2_session_stream_dep_all_your_stream_are_belong_to_us),
+    munit_void_test(test_nghttp2_session_stream_attach_item),
+    munit_void_test(test_nghttp2_session_stream_attach_item_subtree),
+    munit_void_test(test_nghttp2_session_stream_get_state),
+    munit_void_test(test_nghttp2_session_stream_get_something),
+    munit_void_test(test_nghttp2_session_find_stream),
+    munit_void_test(test_nghttp2_session_keep_closed_stream),
+    munit_void_test(test_nghttp2_session_keep_idle_stream),
+    munit_void_test(test_nghttp2_session_detach_idle_stream),
+    munit_void_test(test_nghttp2_session_large_dep_tree),
+    munit_void_test(test_nghttp2_session_graceful_shutdown),
+    munit_void_test(test_nghttp2_session_on_header_temporal_failure),
+    munit_void_test(test_nghttp2_session_recv_client_magic),
+    munit_void_test(test_nghttp2_session_delete_data_item),
+    munit_void_test(test_nghttp2_session_open_idle_stream),
+    munit_void_test(test_nghttp2_session_cancel_reserved_remote),
+    munit_void_test(test_nghttp2_session_reset_pending_headers),
+    munit_void_test(test_nghttp2_session_send_data_callback),
+    munit_void_test(test_nghttp2_session_on_begin_headers_temporal_failure),
+    munit_void_test(test_nghttp2_session_defer_then_close),
+    munit_void_test(test_nghttp2_session_detach_item_from_closed_stream),
+    munit_void_test(test_nghttp2_session_flooding),
+    munit_void_test(test_nghttp2_session_change_stream_priority),
+    munit_void_test(test_nghttp2_session_change_extpri_stream_priority),
+    munit_void_test(test_nghttp2_session_create_idle_stream),
+    munit_void_test(test_nghttp2_session_repeated_priority_change),
+    munit_void_test(test_nghttp2_session_repeated_priority_submission),
+    munit_void_test(test_nghttp2_session_set_local_window_size),
+    munit_void_test(test_nghttp2_session_cancel_from_before_frame_send),
+    munit_void_test(test_nghttp2_session_too_many_settings),
+    munit_void_test(test_nghttp2_session_removed_closed_stream),
+    munit_void_test(test_nghttp2_session_pause_data),
+    munit_void_test(test_nghttp2_session_no_closed_streams),
+    munit_void_test(test_nghttp2_session_set_stream_user_data),
+    munit_void_test(test_nghttp2_session_no_rfc7540_priorities),
+    munit_void_test(test_nghttp2_session_server_fallback_rfc7540_priorities),
+    munit_void_test(test_nghttp2_session_stream_reset_ratelim),
+    munit_void_test(test_nghttp2_http_mandatory_headers),
+    munit_void_test(test_nghttp2_http_content_length),
+    munit_void_test(test_nghttp2_http_content_length_mismatch),
+    munit_void_test(test_nghttp2_http_non_final_response),
+    munit_void_test(test_nghttp2_http_trailer_headers),
+    munit_void_test(test_nghttp2_http_ignore_regular_header),
+    munit_void_test(test_nghttp2_http_ignore_content_length),
+    munit_void_test(test_nghttp2_http_record_request_method),
+    munit_void_test(test_nghttp2_http_push_promise),
+    munit_void_test(test_nghttp2_http_head_method_upgrade_workaround),
+    munit_void_test(
+        test_nghttp2_http_no_rfc9113_leading_and_trailing_ws_validation),
+    munit_test_end(),
+};
+
+const MunitSuite session_suite = {
+    "/session", tests, NULL, 1, MUNIT_SUITE_OPTION_NONE,
+};
+
 typedef struct {
   uint8_t buf[65535];
   size_t length;
@@ -121,18 +284,20 @@ static void scripted_data_feed_init2(scripted_data_feed *df,
   df->feedseq[0] = len;
 }
 
-static ssize_t null_send_callback(nghttp2_session *session, const uint8_t *data,
-                                  size_t len, int flags, void *user_data) {
+static nghttp2_ssize null_send_callback(nghttp2_session *session,
+                                        const uint8_t *data, size_t len,
+                                        int flags, void *user_data) {
   (void)session;
   (void)data;
   (void)flags;
   (void)user_data;
 
-  return (ssize_t)len;
+  return (nghttp2_ssize)len;
 }
 
-static ssize_t fail_send_callback(nghttp2_session *session, const uint8_t *data,
-                                  size_t len, int flags, void *user_data) {
+static nghttp2_ssize fail_send_callback(nghttp2_session *session,
+                                        const uint8_t *data, size_t len,
+                                        int flags, void *user_data) {
   (void)session;
   (void)data;
   (void)len;
@@ -142,19 +307,20 @@ static ssize_t fail_send_callback(nghttp2_session *session, const uint8_t *data,
   return NGHTTP2_ERR_CALLBACK_FAILURE;
 }
 
-static ssize_t fixed_bytes_send_callback(nghttp2_session *session,
-                                         const uint8_t *data, size_t len,
-                                         int flags, void *user_data) {
+static nghttp2_ssize fixed_bytes_send_callback(nghttp2_session *session,
+                                               const uint8_t *data, size_t len,
+                                               int flags, void *user_data) {
   size_t fixed_sendlen = ((my_user_data *)user_data)->fixed_sendlen;
   (void)session;
   (void)data;
   (void)flags;
 
-  return (ssize_t)(fixed_sendlen < len ? fixed_sendlen : len);
+  return (nghttp2_ssize)(fixed_sendlen < len ? fixed_sendlen : len);
 }
 
-static ssize_t scripted_recv_callback(nghttp2_session *session, uint8_t *data,
-                                      size_t len, int flags, void *user_data) {
+static nghttp2_ssize scripted_recv_callback(nghttp2_session *session,
+                                            uint8_t *data, size_t len,
+                                            int flags, void *user_data) {
   scripted_data_feed *df = ((my_user_data *)user_data)->df;
   size_t wlen = df->feedseq[df->seqidx] > len ? len : df->feedseq[df->seqidx];
   (void)session;
@@ -166,11 +332,11 @@ static ssize_t scripted_recv_callback(nghttp2_session *session, uint8_t *data,
   if (df->feedseq[df->seqidx] == 0) {
     ++df->seqidx;
   }
-  return (ssize_t)wlen;
+  return (nghttp2_ssize)wlen;
 }
 
-static ssize_t eof_recv_callback(nghttp2_session *session, uint8_t *data,
-                                 size_t len, int flags, void *user_data) {
+static nghttp2_ssize eof_recv_callback(nghttp2_session *session, uint8_t *data,
+                                       size_t len, int flags, void *user_data) {
   (void)session;
   (void)data;
   (void)len;
@@ -180,9 +346,9 @@ static ssize_t eof_recv_callback(nghttp2_session *session, uint8_t *data,
   return NGHTTP2_ERR_EOF;
 }
 
-static ssize_t accumulator_send_callback(nghttp2_session *session,
-                                         const uint8_t *buf, size_t len,
-                                         int flags, void *user_data) {
+static nghttp2_ssize accumulator_send_callback(nghttp2_session *session,
+                                               const uint8_t *buf, size_t len,
+                                               int flags, void *user_data) {
   accumulator *acc = ((my_user_data *)user_data)->acc;
   (void)session;
   (void)flags;
@@ -190,7 +356,7 @@ static ssize_t accumulator_send_callback(nghttp2_session *session,
   assert(acc->length + len < sizeof(acc->buf));
   memcpy(acc->buf + acc->length, buf, len);
   acc->length += len;
-  return (ssize_t)len;
+  return (nghttp2_ssize)len;
 }
 
 static int on_begin_frame_callback(nghttp2_session *session,
@@ -290,16 +456,18 @@ static int pause_on_data_chunk_recv_callback(nghttp2_session *session,
   return NGHTTP2_ERR_PAUSE;
 }
 
-static ssize_t select_padding_callback(nghttp2_session *session,
-                                       const nghttp2_frame *frame,
-                                       size_t max_payloadlen, void *user_data) {
+static nghttp2_ssize select_padding_callback(nghttp2_session *session,
+                                             const nghttp2_frame *frame,
+                                             size_t max_payloadlen,
+                                             void *user_data) {
   my_user_data *ud = (my_user_data *)user_data;
   (void)session;
 
-  return (ssize_t)nghttp2_min(max_payloadlen, frame->hd.length + ud->padlen);
+  return (nghttp2_ssize)nghttp2_min(max_payloadlen,
+                                    frame->hd.length + ud->padlen);
 }
 
-static ssize_t too_large_data_source_length_callback(
+static nghttp2_ssize too_large_data_source_length_callback(
     nghttp2_session *session, uint8_t frame_type, int32_t stream_id,
     int32_t session_remote_window_size, int32_t stream_remote_window_size,
     uint32_t remote_max_frame_size, void *user_data) {
@@ -314,7 +482,7 @@ static ssize_t too_large_data_source_length_callback(
   return NGHTTP2_MAX_FRAME_SIZE_MAX + 1;
 }
 
-static ssize_t smallest_length_data_source_length_callback(
+static nghttp2_ssize smallest_length_data_source_length_callback(
     nghttp2_session *session, uint8_t frame_type, int32_t stream_id,
     int32_t session_remote_window_size, int32_t stream_remote_window_size,
     uint32_t remote_max_frame_size, void *user_data) {
@@ -329,7 +497,7 @@ static ssize_t smallest_length_data_source_length_callback(
   return 1;
 }
 
-static ssize_t fixed_length_data_source_read_callback(
+static nghttp2_ssize fixed_length_data_source_read_callback(
     nghttp2_session *session, int32_t stream_id, uint8_t *buf, size_t len,
     uint32_t *data_flags, nghttp2_data_source *source, void *user_data) {
   my_user_data *ud = (my_user_data *)user_data;
@@ -348,10 +516,10 @@ static ssize_t fixed_length_data_source_read_callback(
   if (ud->data_source_length == 0) {
     *data_flags |= NGHTTP2_DATA_FLAG_EOF;
   }
-  return (ssize_t)wlen;
+  return (nghttp2_ssize)wlen;
 }
 
-static ssize_t temporal_failure_data_source_read_callback(
+static nghttp2_ssize temporal_failure_data_source_read_callback(
     nghttp2_session *session, int32_t stream_id, uint8_t *buf, size_t len,
     uint32_t *data_flags, nghttp2_data_source *source, void *user_data) {
   (void)session;
@@ -365,11 +533,10 @@ static ssize_t temporal_failure_data_source_read_callback(
   return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
 }
 
-static ssize_t fail_data_source_read_callback(nghttp2_session *session,
-                                              int32_t stream_id, uint8_t *buf,
-                                              size_t len, uint32_t *data_flags,
-                                              nghttp2_data_source *source,
-                                              void *user_data) {
+static nghttp2_ssize
+fail_data_source_read_callback(nghttp2_session *session, int32_t stream_id,
+                               uint8_t *buf, size_t len, uint32_t *data_flags,
+                               nghttp2_data_source *source, void *user_data) {
   (void)session;
   (void)stream_id;
   (void)buf;
@@ -381,7 +548,7 @@ static ssize_t fail_data_source_read_callback(nghttp2_session *session,
   return NGHTTP2_ERR_CALLBACK_FAILURE;
 }
 
-static ssize_t no_end_stream_data_source_read_callback(
+static nghttp2_ssize no_end_stream_data_source_read_callback(
     nghttp2_session *session, int32_t stream_id, uint8_t *buf, size_t len,
     uint32_t *data_flags, nghttp2_data_source *source, void *user_data) {
   (void)session;
@@ -395,7 +562,7 @@ static ssize_t no_end_stream_data_source_read_callback(
   return 0;
 }
 
-static ssize_t no_copy_data_source_read_callback(
+static nghttp2_ssize no_copy_data_source_read_callback(
     nghttp2_session *session, int32_t stream_id, uint8_t *buf, size_t len,
     uint32_t *data_flags, nghttp2_data_source *source, void *user_data) {
   my_user_data *ud = (my_user_data *)user_data;
@@ -418,7 +585,7 @@ static ssize_t no_copy_data_source_read_callback(
   if (ud->data_source_length == 0) {
     *data_flags |= NGHTTP2_DATA_FLAG_EOF;
   }
-  return (ssize_t)wlen;
+  return (nghttp2_ssize)wlen;
 }
 
 static int send_data_callback(nghttp2_session *session, nghttp2_frame *frame,
@@ -444,9 +611,9 @@ static int send_data_callback(nghttp2_session *session, nghttp2_frame *frame,
   return 0;
 }
 
-static ssize_t block_count_send_callback(nghttp2_session *session,
-                                         const uint8_t *data, size_t len,
-                                         int flags, void *user_data) {
+static nghttp2_ssize block_count_send_callback(nghttp2_session *session,
+                                               const uint8_t *data, size_t len,
+                                               int flags, void *user_data) {
   my_user_data *ud = (my_user_data *)user_data;
   (void)session;
   (void)data;
@@ -457,7 +624,7 @@ static ssize_t block_count_send_callback(nghttp2_session *session,
   }
 
   --ud->block_count;
-  return (ssize_t)len;
+  return (nghttp2_ssize)len;
 }
 
 static int on_header_callback(nghttp2_session *session,
@@ -555,11 +722,10 @@ static int temporal_failure_on_begin_headers_callback(
   return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
 }
 
-static ssize_t defer_data_source_read_callback(nghttp2_session *session,
-                                               int32_t stream_id, uint8_t *buf,
-                                               size_t len, uint32_t *data_flags,
-                                               nghttp2_data_source *source,
-                                               void *user_data) {
+static nghttp2_ssize
+defer_data_source_read_callback(nghttp2_session *session, int32_t stream_id,
+                                uint8_t *buf, size_t len, uint32_t *data_flags,
+                                nghttp2_data_source *source, void *user_data) {
   (void)session;
   (void)stream_id;
   (void)buf;
@@ -593,9 +759,10 @@ static int fatal_error_on_stream_close_callback(nghttp2_session *session,
   return NGHTTP2_ERR_CALLBACK_FAILURE;
 }
 
-static ssize_t pack_extension_callback(nghttp2_session *session, uint8_t *buf,
-                                       size_t len, const nghttp2_frame *frame,
-                                       void *user_data) {
+static nghttp2_ssize pack_extension_callback(nghttp2_session *session,
+                                             uint8_t *buf, size_t len,
+                                             const nghttp2_frame *frame,
+                                             void *user_data) {
   nghttp2_buf *p = frame->ext.payload;
   (void)session;
   (void)len;
@@ -603,7 +770,7 @@ static ssize_t pack_extension_callback(nghttp2_session *session, uint8_t *buf,
 
   memcpy(buf, p->pos, nghttp2_buf_len(p));
 
-  return (ssize_t)nghttp2_buf_len(p);
+  return (nghttp2_ssize)nghttp2_buf_len(p);
 }
 
 static int on_extension_chunk_recv_callback(nghttp2_session *session,
@@ -686,8 +853,8 @@ void test_nghttp2_session_recv(void) {
   frame_pack_bufs_init(&bufs);
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
-  callbacks.recv_callback = scripted_recv_callback;
+  callbacks.send_callback2 = null_send_callback;
+  callbacks.recv_callback2 = scripted_recv_callback;
   callbacks.on_frame_recv_callback = on_frame_recv_callback;
   callbacks.on_begin_frame_callback = on_begin_frame_callback;
 
@@ -702,7 +869,7 @@ void test_nghttp2_session_recv(void) {
                              NGHTTP2_HCAT_HEADERS, NULL, nva, nvlen);
   rv = nghttp2_frame_pack_headers(&bufs, &frame.headers, &deflater);
 
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   scripted_data_feed_init2(&df, &bufs);
 
@@ -719,10 +886,10 @@ void test_nghttp2_session_recv(void) {
   user_data.begin_frame_cb_called = 0;
 
   while (df.seqidx < framelen) {
-    CU_ASSERT(0 == nghttp2_session_recv(session));
+    assert_int(0, ==, nghttp2_session_recv(session));
   }
-  CU_ASSERT(1 == user_data.frame_recv_cb_called);
-  CU_ASSERT(1 == user_data.begin_frame_cb_called);
+  assert_int(1, ==, user_data.frame_recv_cb_called);
+  assert_int(1, ==, user_data.begin_frame_cb_called);
 
   nghttp2_bufs_reset(&bufs);
 
@@ -738,9 +905,9 @@ void test_nghttp2_session_recv(void) {
   user_data.frame_recv_cb_called = 0;
   user_data.begin_frame_cb_called = 0;
 
-  CU_ASSERT(0 == nghttp2_session_recv(session));
-  CU_ASSERT(1 == user_data.frame_recv_cb_called);
-  CU_ASSERT(1 == user_data.begin_frame_cb_called);
+  assert_int(0, ==, nghttp2_session_recv(session));
+  assert_int(1, ==, user_data.frame_recv_cb_called);
+  assert_int(1, ==, user_data.begin_frame_cb_called);
 
   nghttp2_bufs_reset(&bufs);
 
@@ -770,14 +937,14 @@ void test_nghttp2_session_recv(void) {
   user_data.frame_recv_cb_called = 0;
   user_data.begin_frame_cb_called = 0;
 
-  CU_ASSERT(0 == nghttp2_session_recv(session));
-  CU_ASSERT(0 == user_data.frame_recv_cb_called);
-  CU_ASSERT(0 == user_data.begin_frame_cb_called);
+  assert_int(0, ==, nghttp2_session_recv(session));
+  assert_int(0, ==, user_data.frame_recv_cb_called);
+  assert_int(0, ==, user_data.begin_frame_cb_called);
 
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(NGHTTP2_GOAWAY == item->frame.hd.type);
-  CU_ASSERT(NGHTTP2_FRAME_SIZE_ERROR == item->frame.goaway.error_code);
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_uint8(NGHTTP2_GOAWAY, ==, item->frame.hd.type);
+  assert_uint32(NGHTTP2_FRAME_SIZE_ERROR, ==, item->frame.goaway.error_code);
+  assert_int(0, ==, nghttp2_session_send(session));
 
   nghttp2_bufs_free(&bufs);
   nghttp2_session_del(session);
@@ -800,7 +967,7 @@ void test_nghttp2_session_recv_invalid_stream_id(void) {
   frame_pack_bufs_init(&bufs);
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.recv_callback = scripted_recv_callback;
+  callbacks.recv_callback2 = scripted_recv_callback;
   callbacks.on_invalid_frame_recv_callback = on_invalid_frame_recv_callback;
 
   user_data.df = &df;
@@ -814,14 +981,14 @@ void test_nghttp2_session_recv_invalid_stream_id(void) {
                              NGHTTP2_HCAT_HEADERS, NULL, nva, nvlen);
   rv = nghttp2_frame_pack_headers(&bufs, &frame.headers, &deflater);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(nghttp2_bufs_len(&bufs) > 0);
+  assert_int(0, ==, rv);
+  assert_size(0, <, nghttp2_bufs_len(&bufs));
 
   scripted_data_feed_init2(&df, &bufs);
   nghttp2_frame_headers_free(&frame.headers, mem);
 
-  CU_ASSERT(0 == nghttp2_session_recv(session));
-  CU_ASSERT(1 == user_data.invalid_frame_recv_cb_called);
+  assert_int(0, ==, nghttp2_session_recv(session));
+  assert_int(1, ==, user_data.invalid_frame_recv_cb_called);
 
   nghttp2_bufs_free(&bufs);
   nghttp2_hd_deflate_free(&deflater);
@@ -845,8 +1012,8 @@ void test_nghttp2_session_recv_invalid_frame(void) {
   frame_pack_bufs_init(&bufs);
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.recv_callback = scripted_recv_callback;
-  callbacks.send_callback = null_send_callback;
+  callbacks.recv_callback2 = scripted_recv_callback;
+  callbacks.send_callback2 = null_send_callback;
   callbacks.on_frame_send_callback = on_frame_send_callback;
 
   user_data.df = &df;
@@ -859,23 +1026,23 @@ void test_nghttp2_session_recv_invalid_frame(void) {
                              NGHTTP2_HCAT_HEADERS, NULL, nva, nvlen);
   rv = nghttp2_frame_pack_headers(&bufs, &frame.headers, &deflater);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(nghttp2_bufs_len(&bufs) > 0);
+  assert_int(0, ==, rv);
+  assert_size(0, <, nghttp2_bufs_len(&bufs));
 
   scripted_data_feed_init2(&df, &bufs);
 
-  CU_ASSERT(0 == nghttp2_session_recv(session));
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(0 == user_data.frame_send_cb_called);
+  assert_int(0, ==, nghttp2_session_recv(session));
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_int(0, ==, user_data.frame_send_cb_called);
 
   /* Receive exactly same bytes of HEADERS is treated as error, because it has
    * pseudo headers and without END_STREAM flag set */
   scripted_data_feed_init2(&df, &bufs);
 
-  CU_ASSERT(0 == nghttp2_session_recv(session));
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(1 == user_data.frame_send_cb_called);
-  CU_ASSERT(NGHTTP2_RST_STREAM == user_data.sent_frame_type);
+  assert_int(0, ==, nghttp2_session_recv(session));
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_int(1, ==, user_data.frame_send_cb_called);
+  assert_uint8(NGHTTP2_RST_STREAM, ==, user_data.sent_frame_type);
 
   nghttp2_bufs_free(&bufs);
   nghttp2_frame_headers_free(&frame.headers, mem);
@@ -889,11 +1056,11 @@ void test_nghttp2_session_recv_eof(void) {
   nghttp2_session_callbacks callbacks;
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
-  callbacks.recv_callback = eof_recv_callback;
+  callbacks.send_callback2 = null_send_callback;
+  callbacks.recv_callback2 = eof_recv_callback;
 
   nghttp2_session_client_new(&session, &callbacks, NULL);
-  CU_ASSERT(NGHTTP2_ERR_EOF == nghttp2_session_recv(session));
+  assert_int(NGHTTP2_ERR_EOF, ==, nghttp2_session_recv(session));
 
   nghttp2_session_del(session);
 }
@@ -903,14 +1070,14 @@ void test_nghttp2_session_recv_data(void) {
   nghttp2_session_callbacks callbacks;
   my_user_data ud;
   uint8_t data[8092];
-  ssize_t rv;
+  nghttp2_ssize rv;
   nghttp2_outbound_item *item;
   nghttp2_stream *stream;
   nghttp2_frame_hd hd;
   int i;
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
   callbacks.on_data_chunk_recv_callback = on_data_chunk_recv_callback;
   callbacks.on_frame_recv_callback = on_frame_recv_callback;
   callbacks.on_frame_send_callback = on_frame_send_callback;
@@ -929,13 +1096,13 @@ void test_nghttp2_session_recv_data(void) {
      error.  This is not mandated by the spec */
   ud.data_chunk_recv_cb_called = 0;
   ud.frame_recv_cb_called = 0;
-  rv = nghttp2_session_mem_recv(session, data, NGHTTP2_FRAME_HDLEN + 4096);
-  CU_ASSERT(NGHTTP2_FRAME_HDLEN + 4096 == rv);
+  rv = nghttp2_session_mem_recv2(session, data, NGHTTP2_FRAME_HDLEN + 4096);
+  assert_ptrdiff(NGHTTP2_FRAME_HDLEN + 4096, ==, rv);
 
-  CU_ASSERT(0 == ud.data_chunk_recv_cb_called);
-  CU_ASSERT(0 == ud.frame_recv_cb_called);
+  assert_int(0, ==, ud.data_chunk_recv_cb_called);
+  assert_int(0, ==, ud.frame_recv_cb_called);
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(NGHTTP2_GOAWAY == item->frame.hd.type);
+  assert_uint8(NGHTTP2_GOAWAY, ==, item->frame.hd.type);
 
   nghttp2_session_del(session);
 
@@ -950,40 +1117,40 @@ void test_nghttp2_session_recv_data(void) {
 
   ud.data_chunk_recv_cb_called = 0;
   ud.frame_recv_cb_called = 0;
-  rv = nghttp2_session_mem_recv(session, data, NGHTTP2_FRAME_HDLEN + 4096);
-  CU_ASSERT(NGHTTP2_FRAME_HDLEN + 4096 == rv);
+  rv = nghttp2_session_mem_recv2(session, data, NGHTTP2_FRAME_HDLEN + 4096);
+  assert_ptrdiff(NGHTTP2_FRAME_HDLEN + 4096, ==, rv);
 
-  CU_ASSERT(0 == ud.data_chunk_recv_cb_called);
-  CU_ASSERT(0 == ud.frame_recv_cb_called);
+  assert_int(0, ==, ud.data_chunk_recv_cb_called);
+  assert_int(0, ==, ud.frame_recv_cb_called);
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(NULL == item);
+  assert_null(item);
 
   /* This is normal case. DATA is acceptable. */
   stream->state = NGHTTP2_STREAM_OPENED;
 
   ud.data_chunk_recv_cb_called = 0;
   ud.frame_recv_cb_called = 0;
-  rv = nghttp2_session_mem_recv(session, data, NGHTTP2_FRAME_HDLEN + 4096);
-  CU_ASSERT(NGHTTP2_FRAME_HDLEN + 4096 == rv);
+  rv = nghttp2_session_mem_recv2(session, data, NGHTTP2_FRAME_HDLEN + 4096);
+  assert_ptrdiff(NGHTTP2_FRAME_HDLEN + 4096, ==, rv);
 
-  CU_ASSERT(1 == ud.data_chunk_recv_cb_called);
-  CU_ASSERT(1 == ud.frame_recv_cb_called);
+  assert_int(1, ==, ud.data_chunk_recv_cb_called);
+  assert_int(1, ==, ud.frame_recv_cb_called);
 
-  CU_ASSERT(NULL == nghttp2_session_get_next_ob_item(session));
+  assert_null(nghttp2_session_get_next_ob_item(session));
 
   ud.data_chunk_recv_cb_called = 0;
   ud.frame_recv_cb_called = 0;
-  rv = nghttp2_session_mem_recv(session, data, NGHTTP2_FRAME_HDLEN + 4096);
-  CU_ASSERT(NGHTTP2_FRAME_HDLEN + 4096 == rv);
+  rv = nghttp2_session_mem_recv2(session, data, NGHTTP2_FRAME_HDLEN + 4096);
+  assert_ptrdiff(NGHTTP2_FRAME_HDLEN + 4096, ==, rv);
 
   /* Now we got data more than initial-window-size / 2, WINDOW_UPDATE
      must be queued */
-  CU_ASSERT(1 == ud.data_chunk_recv_cb_called);
-  CU_ASSERT(1 == ud.frame_recv_cb_called);
+  assert_int(1, ==, ud.data_chunk_recv_cb_called);
+  assert_int(1, ==, ud.frame_recv_cb_called);
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(NGHTTP2_WINDOW_UPDATE == item->frame.hd.type);
-  CU_ASSERT(1 == item->frame.window_update.hd.stream_id);
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_uint8(NGHTTP2_WINDOW_UPDATE, ==, item->frame.hd.type);
+  assert_int32(1, ==, item->frame.window_update.hd.stream_id);
+  assert_int(0, ==, nghttp2_session_send(session));
 
   /* Set initial window size to 1MiB, so that we can check connection
      flow control individually */
@@ -993,13 +1160,13 @@ void test_nghttp2_session_recv_data(void) {
      DATA. Additional 4 DATA frames, connection flow control will kick
      in. */
   for (i = 0; i < 5; ++i) {
-    rv = nghttp2_session_mem_recv(session, data, NGHTTP2_FRAME_HDLEN + 4096);
-    CU_ASSERT(NGHTTP2_FRAME_HDLEN + 4096 == rv);
+    rv = nghttp2_session_mem_recv2(session, data, NGHTTP2_FRAME_HDLEN + 4096);
+    assert_ptrdiff(NGHTTP2_FRAME_HDLEN + 4096, ==, rv);
   }
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(NGHTTP2_WINDOW_UPDATE == item->frame.hd.type);
-  CU_ASSERT(0 == item->frame.window_update.hd.stream_id);
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_uint8(NGHTTP2_WINDOW_UPDATE, ==, item->frame.hd.type);
+  assert_int32(0, ==, item->frame.window_update.hd.stream_id);
+  assert_int(0, ==, nghttp2_session_send(session));
 
   /* Reception of DATA with stream ID = 0 causes connection error */
   hd.length = 4096;
@@ -1010,14 +1177,14 @@ void test_nghttp2_session_recv_data(void) {
 
   ud.data_chunk_recv_cb_called = 0;
   ud.frame_recv_cb_called = 0;
-  rv = nghttp2_session_mem_recv(session, data, NGHTTP2_FRAME_HDLEN + 4096);
-  CU_ASSERT(NGHTTP2_FRAME_HDLEN + 4096 == rv);
+  rv = nghttp2_session_mem_recv2(session, data, NGHTTP2_FRAME_HDLEN + 4096);
+  assert_ptrdiff(NGHTTP2_FRAME_HDLEN + 4096, ==, rv);
 
-  CU_ASSERT(0 == ud.data_chunk_recv_cb_called);
-  CU_ASSERT(0 == ud.frame_recv_cb_called);
+  assert_int(0, ==, ud.data_chunk_recv_cb_called);
+  assert_int(0, ==, ud.frame_recv_cb_called);
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(NGHTTP2_GOAWAY == item->frame.hd.type);
-  CU_ASSERT(NGHTTP2_PROTOCOL_ERROR == item->frame.goaway.error_code);
+  assert_uint8(NGHTTP2_GOAWAY, ==, item->frame.hd.type);
+  assert_uint32(NGHTTP2_PROTOCOL_ERROR, ==, item->frame.goaway.error_code);
 
   nghttp2_session_del(session);
 
@@ -1036,20 +1203,20 @@ void test_nghttp2_session_recv_data(void) {
      it triggers first WINDOW_UPDATE of window_size_increment
      32767. */
   for (i = 0; i < 7; ++i) {
-    rv = nghttp2_session_mem_recv(session, data, NGHTTP2_FRAME_HDLEN + 4096);
-    CU_ASSERT(NGHTTP2_FRAME_HDLEN + 4096 == rv);
+    rv = nghttp2_session_mem_recv2(session, data, NGHTTP2_FRAME_HDLEN + 4096);
+    assert_ptrdiff(NGHTTP2_FRAME_HDLEN + 4096, ==, rv);
   }
 
   hd.length = 4095;
   nghttp2_frame_pack_frame_hd(data, &hd);
-  rv = nghttp2_session_mem_recv(session, data, NGHTTP2_FRAME_HDLEN + 4095);
-  CU_ASSERT(NGHTTP2_FRAME_HDLEN + 4095 == rv);
+  rv = nghttp2_session_mem_recv2(session, data, NGHTTP2_FRAME_HDLEN + 4095);
+  assert_ptrdiff(NGHTTP2_FRAME_HDLEN + 4095, ==, rv);
 
   /* Now 2 WINDOW_UPDATEs for session and stream should be queued. */
-  CU_ASSERT(0 == stream->recv_window_size);
-  CU_ASSERT(0 == session->recv_window_size);
-  CU_ASSERT(1 == stream->window_update_queued);
-  CU_ASSERT(1 == session->window_update_queued);
+  assert_int32(0, ==, stream->recv_window_size);
+  assert_int32(0, ==, session->recv_window_size);
+  assert_true(stream->window_update_queued);
+  assert_true(session->window_update_queued);
 
   /* Then send 32768 bytes of DATA.  Since we have not sent queued
      WINDOW_UDPATE frame, recv_window_size should not be decreased */
@@ -1057,29 +1224,29 @@ void test_nghttp2_session_recv_data(void) {
   nghttp2_frame_pack_frame_hd(data, &hd);
 
   for (i = 0; i < 8; ++i) {
-    rv = nghttp2_session_mem_recv(session, data, NGHTTP2_FRAME_HDLEN + 4096);
-    CU_ASSERT(NGHTTP2_FRAME_HDLEN + 4096 == rv);
+    rv = nghttp2_session_mem_recv2(session, data, NGHTTP2_FRAME_HDLEN + 4096);
+    assert_ptrdiff(NGHTTP2_FRAME_HDLEN + 4096, ==, rv);
   }
 
   /* WINDOW_UPDATE is blocked for session and stream, so
      recv_window_size must not be decreased. */
-  CU_ASSERT(32768 == stream->recv_window_size);
-  CU_ASSERT(32768 == session->recv_window_size);
-  CU_ASSERT(1 == stream->window_update_queued);
-  CU_ASSERT(1 == session->window_update_queued);
+  assert_int32(32768, ==, stream->recv_window_size);
+  assert_int32(32768, ==, session->recv_window_size);
+  assert_true(stream->window_update_queued);
+  assert_true(session->window_update_queued);
 
   ud.frame_send_cb_called = 0;
 
   /* This sends queued WINDOW_UPDATES.  And then check
      recv_window_size, and queue WINDOW_UPDATEs for both session and
      stream, and send them at once. */
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
 
-  CU_ASSERT(4 == ud.frame_send_cb_called);
-  CU_ASSERT(0 == stream->recv_window_size);
-  CU_ASSERT(0 == session->recv_window_size);
-  CU_ASSERT(0 == stream->window_update_queued);
-  CU_ASSERT(0 == session->window_update_queued);
+  assert_int(4, ==, ud.frame_send_cb_called);
+  assert_int32(0, ==, stream->recv_window_size);
+  assert_int32(0, ==, session->recv_window_size);
+  assert_false(stream->window_update_queued);
+  assert_false(session->window_update_queued);
 
   nghttp2_session_del(session);
 }
@@ -1092,13 +1259,13 @@ void test_nghttp2_session_recv_data_no_auto_flow_control(void) {
   nghttp2_frame_hd hd;
   size_t padlen;
   uint8_t data[8192];
-  ssize_t rv;
+  nghttp2_ssize rv;
   size_t sendlen;
   nghttp2_stream *stream;
   size_t i;
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
   callbacks.on_frame_send_callback = on_frame_send_callback;
 
   nghttp2_option_new(&option);
@@ -1122,11 +1289,11 @@ void test_nghttp2_session_recv_data_no_auto_flow_control(void) {
 
   /* Receive first 100 bytes */
   sendlen = 100;
-  rv = nghttp2_session_mem_recv(session, data, sendlen);
-  CU_ASSERT((ssize_t)sendlen == rv);
+  rv = nghttp2_session_mem_recv2(session, data, sendlen);
+  assert_ptrdiff((nghttp2_ssize)sendlen, ==, rv);
 
   /* We consumed pad length field (1 byte) */
-  CU_ASSERT(1 == session->consumed_size);
+  assert_int32(1, ==, session->consumed_size);
 
   /* close stream here */
   nghttp2_submit_rst_stream(session, NGHTTP2_FLAG_NONE, 1, NGHTTP2_NO_ERROR);
@@ -1134,13 +1301,14 @@ void test_nghttp2_session_recv_data_no_auto_flow_control(void) {
 
   /* stream 1 has been closed, and we disabled auto flow-control, so
      data must be immediately consumed for connection. */
-  rv = nghttp2_session_mem_recv(session, data + sendlen,
-                                NGHTTP2_FRAME_HDLEN + hd.length - sendlen);
-  CU_ASSERT((ssize_t)(NGHTTP2_FRAME_HDLEN + hd.length - sendlen) == rv);
+  rv = nghttp2_session_mem_recv2(session, data + sendlen,
+                                 NGHTTP2_FRAME_HDLEN + hd.length - sendlen);
+  assert_ptrdiff((nghttp2_ssize)(NGHTTP2_FRAME_HDLEN + hd.length - sendlen), ==,
+                 rv);
 
   /* We already consumed pad length field (1 byte), so do +1 here */
-  CU_ASSERT((int32_t)(NGHTTP2_FRAME_HDLEN + hd.length - sendlen + 1) ==
-            session->consumed_size);
+  assert_int32((int32_t)(NGHTTP2_FRAME_HDLEN + hd.length - sendlen + 1), ==,
+               session->consumed_size);
 
   nghttp2_session_del(session);
 
@@ -1153,12 +1321,13 @@ void test_nghttp2_session_recv_data_no_auto_flow_control(void) {
   stream = open_recv_stream(session, 1);
   stream->http_flags |= NGHTTP2_HTTP_FLAG_EXPECT_FINAL_RESPONSE;
 
-  rv = nghttp2_session_mem_recv(session, data, NGHTTP2_FRAME_HDLEN + hd.length);
-  CU_ASSERT((ssize_t)(NGHTTP2_FRAME_HDLEN + hd.length) == rv);
+  rv =
+      nghttp2_session_mem_recv2(session, data, NGHTTP2_FRAME_HDLEN + hd.length);
+  assert_ptrdiff((nghttp2_ssize)(NGHTTP2_FRAME_HDLEN + hd.length), ==, rv);
 
   /* Whole payload must be consumed now because HTTP messaging rule
      was not honored. */
-  CU_ASSERT((int32_t)hd.length == session->consumed_size);
+  assert_int32((int32_t)hd.length, ==, session->consumed_size);
 
   nghttp2_session_del(session);
 
@@ -1175,57 +1344,57 @@ void test_nghttp2_session_recv_data_no_auto_flow_control(void) {
 
   /* Receive up to 65535 bytes of DATA */
   for (i = 0; i < 15; ++i) {
-    rv = nghttp2_session_mem_recv(session, data, NGHTTP2_FRAME_HDLEN + 4096);
-    CU_ASSERT(NGHTTP2_FRAME_HDLEN + 4096 == rv);
+    rv = nghttp2_session_mem_recv2(session, data, NGHTTP2_FRAME_HDLEN + 4096);
+    assert_ptrdiff(NGHTTP2_FRAME_HDLEN + 4096, ==, rv);
   }
 
   hd.length = 4095;
   nghttp2_frame_pack_frame_hd(data, &hd);
 
-  rv = nghttp2_session_mem_recv(session, data, NGHTTP2_FRAME_HDLEN + 4095);
-  CU_ASSERT(NGHTTP2_FRAME_HDLEN + 4095 == rv);
+  rv = nghttp2_session_mem_recv2(session, data, NGHTTP2_FRAME_HDLEN + 4095);
+  assert_ptrdiff(NGHTTP2_FRAME_HDLEN + 4095, ==, rv);
 
-  CU_ASSERT(65535 == session->recv_window_size);
-  CU_ASSERT(65535 == stream->recv_window_size);
+  assert_int32(65535, ==, session->recv_window_size);
+  assert_int32(65535, ==, stream->recv_window_size);
 
   /* The first call of nghttp2_session_consume_connection() will queue
      WINDOW_UPDATE.  Next call does not. */
   nghttp2_session_consume_connection(session, 32767);
   nghttp2_session_consume_connection(session, 32768);
 
-  CU_ASSERT(32768 == session->recv_window_size);
-  CU_ASSERT(65535 == stream->recv_window_size);
-  CU_ASSERT(1 == session->window_update_queued);
-  CU_ASSERT(0 == stream->window_update_queued);
+  assert_int32(32768, ==, session->recv_window_size);
+  assert_int32(65535, ==, stream->recv_window_size);
+  assert_true(session->window_update_queued);
+  assert_false(stream->window_update_queued);
 
   ud.frame_send_cb_called = 0;
 
   /* This will send WINDOW_UPDATE, and check whether we should send
      WINDOW_UPDATE, and queue and send it at once. */
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(0 == session->recv_window_size);
-  CU_ASSERT(65535 == stream->recv_window_size);
-  CU_ASSERT(0 == session->window_update_queued);
-  CU_ASSERT(0 == stream->window_update_queued);
-  CU_ASSERT(2 == ud.frame_send_cb_called);
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_int32(0, ==, session->recv_window_size);
+  assert_int32(65535, ==, stream->recv_window_size);
+  assert_false(session->window_update_queued);
+  assert_false(stream->window_update_queued);
+  assert_int(2, ==, ud.frame_send_cb_called);
 
   /* Do the same for stream */
   nghttp2_session_consume_stream(session, 1, 32767);
   nghttp2_session_consume_stream(session, 1, 32768);
 
-  CU_ASSERT(0 == session->recv_window_size);
-  CU_ASSERT(32768 == stream->recv_window_size);
-  CU_ASSERT(0 == session->window_update_queued);
-  CU_ASSERT(1 == stream->window_update_queued);
+  assert_int32(0, ==, session->recv_window_size);
+  assert_int32(32768, ==, stream->recv_window_size);
+  assert_false(session->window_update_queued);
+  assert_true(stream->window_update_queued);
 
   ud.frame_send_cb_called = 0;
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(0 == session->recv_window_size);
-  CU_ASSERT(0 == stream->recv_window_size);
-  CU_ASSERT(0 == session->window_update_queued);
-  CU_ASSERT(0 == stream->window_update_queued);
-  CU_ASSERT(2 == ud.frame_send_cb_called);
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_int32(0, ==, session->recv_window_size);
+  assert_int32(0, ==, stream->recv_window_size);
+  assert_false(session->window_update_queued);
+  assert_false(stream->window_update_queued);
+  assert_int(2, ==, ud.frame_send_cb_called);
 
   nghttp2_session_del(session);
   nghttp2_option_del(option);
@@ -1239,7 +1408,7 @@ void test_nghttp2_session_recv_continuation(void) {
   nghttp2_frame frame;
   nghttp2_bufs bufs;
   nghttp2_buf *buf;
-  ssize_t rv;
+  nghttp2_ssize rv;
   my_user_data ud;
   nghttp2_hd_deflater deflater;
   uint8_t data[1024];
@@ -1267,8 +1436,8 @@ void test_nghttp2_session_recv_continuation(void) {
                              NGHTTP2_HCAT_HEADERS, NULL, nva, nvlen);
   rv = nghttp2_frame_pack_headers(&bufs, &frame.headers, &deflater);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(nghttp2_bufs_len(&bufs) > 0);
+  assert_ptrdiff(0, ==, rv);
+  assert_size(0, <, nghttp2_bufs_len(&bufs));
 
   /* make sure that all data is in the first buf */
   buf = &bufs.head->buf;
@@ -1305,15 +1474,15 @@ void test_nghttp2_session_recv_continuation(void) {
   datalen += cont_hd.length;
   buf->pos += cont_hd.length;
 
-  CU_ASSERT(0 == nghttp2_buf_len(buf));
+  assert_size(0, ==, nghttp2_buf_len(buf));
 
   ud.header_cb_called = 0;
   ud.begin_frame_cb_called = 0;
 
-  rv = nghttp2_session_mem_recv(session, data, datalen);
-  CU_ASSERT((ssize_t)datalen == rv);
-  CU_ASSERT(4 == ud.header_cb_called);
-  CU_ASSERT(3 == ud.begin_frame_cb_called);
+  rv = nghttp2_session_mem_recv2(session, data, datalen);
+  assert_ptrdiff((nghttp2_ssize)datalen, ==, rv);
+  assert_int(4, ==, ud.header_cb_called);
+  assert_int(3, ==, ud.begin_frame_cb_called);
 
   nghttp2_hd_deflate_free(&deflater);
   nghttp2_session_del(session);
@@ -1331,7 +1500,7 @@ void test_nghttp2_session_recv_continuation(void) {
   nghttp2_bufs_reset(&bufs);
   rv = nghttp2_frame_pack_headers(&bufs, &frame.headers, &deflater);
 
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   nghttp2_frame_headers_free(&frame.headers, mem);
 
@@ -1361,16 +1530,16 @@ void test_nghttp2_session_recv_continuation(void) {
   datalen += cont_hd.length;
   buf->pos += cont_hd.length;
 
-  CU_ASSERT(0 == nghttp2_buf_len(buf));
+  assert_size(0, ==, nghttp2_buf_len(buf));
 
   ud.header_cb_called = 0;
   ud.begin_frame_cb_called = 0;
 
-  rv = nghttp2_session_mem_recv(session, data, datalen);
+  rv = nghttp2_session_mem_recv2(session, data, datalen);
 
-  CU_ASSERT((ssize_t)datalen == rv);
-  CU_ASSERT(4 == ud.header_cb_called);
-  CU_ASSERT(2 == ud.begin_frame_cb_called);
+  assert_ptrdiff((nghttp2_ssize)datalen, ==, rv);
+  assert_int(4, ==, ud.header_cb_called);
+  assert_int(2, ==, ud.begin_frame_cb_called);
 
   nghttp2_hd_deflate_free(&deflater);
   nghttp2_session_del(session);
@@ -1388,8 +1557,8 @@ void test_nghttp2_session_recv_continuation(void) {
   nghttp2_bufs_reset(&bufs);
   rv = nghttp2_frame_pack_headers(&bufs, &frame.headers, &deflater);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(nghttp2_bufs_len(&bufs) > 0);
+  assert_ptrdiff(0, ==, rv);
+  assert_size(0, <, nghttp2_bufs_len(&bufs));
 
   nghttp2_frame_headers_free(&frame.headers, mem);
 
@@ -1408,18 +1577,18 @@ void test_nghttp2_session_recv_continuation(void) {
 
   nghttp2_frame_pack_priority(&bufs, &frame.priority);
 
-  CU_ASSERT(nghttp2_bufs_len(&bufs) > 0);
+  assert_size(0, <, nghttp2_bufs_len(&bufs));
 
   memcpy(data + datalen, buf->pos, nghttp2_buf_len(buf));
   datalen += nghttp2_buf_len(buf);
 
   ud.begin_headers_cb_called = 0;
-  rv = nghttp2_session_mem_recv(session, data, datalen);
-  CU_ASSERT((ssize_t)datalen == rv);
+  rv = nghttp2_session_mem_recv2(session, data, datalen);
+  assert_ptrdiff((nghttp2_ssize)datalen, ==, rv);
 
-  CU_ASSERT(1 == ud.begin_headers_cb_called);
-  CU_ASSERT(NGHTTP2_GOAWAY ==
-            nghttp2_session_get_next_ob_item(session)->frame.hd.type);
+  assert_int(1, ==, ud.begin_headers_cb_called);
+  assert_uint8(NGHTTP2_GOAWAY, ==,
+               nghttp2_session_get_next_ob_item(session)->frame.hd.type);
 
   nghttp2_bufs_free(&bufs);
   nghttp2_hd_deflate_free(&deflater);
@@ -1434,7 +1603,7 @@ void test_nghttp2_session_recv_headers_with_priority(void) {
   nghttp2_frame frame;
   nghttp2_bufs bufs;
   nghttp2_buf *buf;
-  ssize_t rv;
+  nghttp2_ssize rv;
   my_user_data ud;
   nghttp2_hd_deflater deflater;
   nghttp2_outbound_item *item;
@@ -1466,8 +1635,8 @@ void test_nghttp2_session_recv_headers_with_priority(void) {
 
   rv = nghttp2_frame_pack_headers(&bufs, &frame.headers, &deflater);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(nghttp2_bufs_len(&bufs) > 0);
+  assert_ptrdiff(0, ==, rv);
+  assert_size(0, <, nghttp2_bufs_len(&bufs));
 
   nghttp2_frame_headers_free(&frame.headers, mem);
 
@@ -1476,15 +1645,15 @@ void test_nghttp2_session_recv_headers_with_priority(void) {
 
   ud.frame_recv_cb_called = 0;
 
-  rv = nghttp2_session_mem_recv(session, buf->pos, nghttp2_buf_len(buf));
+  rv = nghttp2_session_mem_recv2(session, buf->pos, nghttp2_buf_len(buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(buf) == rv);
-  CU_ASSERT(1 == ud.frame_recv_cb_called);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(buf), ==, rv);
+  assert_int(1, ==, ud.frame_recv_cb_called);
 
   stream = nghttp2_session_get_stream(session, 3);
 
-  CU_ASSERT(99 == stream->weight);
-  CU_ASSERT(1 == stream->dep_prev->stream_id);
+  assert_int32(99, ==, stream->weight);
+  assert_int32(1, ==, stream->dep_prev->stream_id);
 
   nghttp2_bufs_reset(&bufs);
 
@@ -1501,8 +1670,8 @@ void test_nghttp2_session_recv_headers_with_priority(void) {
 
   rv = nghttp2_frame_pack_headers(&bufs, &frame.headers, &deflater);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(nghttp2_bufs_len(&bufs) > NGHTTP2_FRAME_HDLEN + 5);
+  assert_ptrdiff(0, ==, rv);
+  assert_size(NGHTTP2_FRAME_HDLEN + 5, <, nghttp2_bufs_len(&bufs));
 
   nghttp2_frame_headers_free(&frame.headers, mem);
 
@@ -1513,19 +1682,19 @@ void test_nghttp2_session_recv_headers_with_priority(void) {
 
   ud.frame_recv_cb_called = 0;
 
-  rv = nghttp2_session_mem_recv(session, buf->pos, nghttp2_buf_len(buf));
+  rv = nghttp2_session_mem_recv2(session, buf->pos, nghttp2_buf_len(buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(buf) == rv);
-  CU_ASSERT(0 == ud.frame_recv_cb_called);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(buf), ==, rv);
+  assert_int(0, ==, ud.frame_recv_cb_called);
 
   stream = nghttp2_session_get_stream(session, 5);
 
-  CU_ASSERT(NULL == stream);
+  assert_null(stream);
 
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(NULL != item);
-  CU_ASSERT(NGHTTP2_GOAWAY == item->frame.hd.type);
-  CU_ASSERT(NGHTTP2_FRAME_SIZE_ERROR == item->frame.goaway.error_code);
+  assert_not_null(item);
+  assert_uint8(NGHTTP2_GOAWAY, ==, item->frame.hd.type);
+  assert_uint32(NGHTTP2_FRAME_SIZE_ERROR, ==, item->frame.goaway.error_code);
 
   nghttp2_bufs_reset(&bufs);
 
@@ -1548,8 +1717,8 @@ void test_nghttp2_session_recv_headers_with_priority(void) {
 
   rv = nghttp2_frame_pack_headers(&bufs, &frame.headers, &deflater);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(nghttp2_bufs_len(&bufs) > 0);
+  assert_ptrdiff(0, ==, rv);
+  assert_size(0, <, nghttp2_bufs_len(&bufs));
 
   nghttp2_frame_headers_free(&frame.headers, mem);
 
@@ -1558,19 +1727,19 @@ void test_nghttp2_session_recv_headers_with_priority(void) {
 
   ud.frame_recv_cb_called = 0;
 
-  rv = nghttp2_session_mem_recv(session, buf->pos, nghttp2_buf_len(buf));
+  rv = nghttp2_session_mem_recv2(session, buf->pos, nghttp2_buf_len(buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(buf) == rv);
-  CU_ASSERT(0 == ud.frame_recv_cb_called);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(buf), ==, rv);
+  assert_int(0, ==, ud.frame_recv_cb_called);
 
   stream = nghttp2_session_get_stream(session, 1);
 
-  CU_ASSERT(NULL == stream);
+  assert_null(stream);
 
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(NULL != item);
-  CU_ASSERT(NGHTTP2_GOAWAY == item->frame.hd.type);
-  CU_ASSERT(NGHTTP2_PROTOCOL_ERROR == item->frame.goaway.error_code);
+  assert_not_null(item);
+  assert_uint8(NGHTTP2_GOAWAY, ==, item->frame.hd.type);
+  assert_uint32(NGHTTP2_PROTOCOL_ERROR, ==, item->frame.goaway.error_code);
 
   nghttp2_bufs_reset(&bufs);
 
@@ -1587,13 +1756,13 @@ void test_nghttp2_session_recv_headers_with_padding(void) {
   nghttp2_frame_hd hd;
   nghttp2_outbound_item *item;
   my_user_data ud;
-  ssize_t rv;
+  nghttp2_ssize rv;
 
   frame_pack_bufs_init(&bufs);
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
   callbacks.on_frame_recv_callback = on_frame_recv_callback;
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   /* HEADERS: Wrong padding length */
   nghttp2_session_server_new(&session, &callbacks, &ud);
@@ -1618,15 +1787,15 @@ void test_nghttp2_session_recv_headers_with_padding(void) {
 
   ud.frame_recv_cb_called = 0;
 
-  rv = nghttp2_session_mem_recv(session, buf->pos, nghttp2_buf_len(buf));
+  rv = nghttp2_session_mem_recv2(session, buf->pos, nghttp2_buf_len(buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(buf) == rv);
-  CU_ASSERT(0 == ud.frame_recv_cb_called);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(buf), ==, rv);
+  assert_int(0, ==, ud.frame_recv_cb_called);
 
   item = nghttp2_session_get_next_ob_item(session);
 
-  CU_ASSERT(NULL != item);
-  CU_ASSERT(NGHTTP2_GOAWAY == item->frame.hd.type);
+  assert_not_null(item);
+  assert_uint8(NGHTTP2_GOAWAY, ==, item->frame.hd.type);
 
   nghttp2_bufs_reset(&bufs);
   nghttp2_session_del(session);
@@ -1653,15 +1822,15 @@ void test_nghttp2_session_recv_headers_with_padding(void) {
 
   ud.frame_recv_cb_called = 0;
 
-  rv = nghttp2_session_mem_recv(session, buf->pos, nghttp2_buf_len(buf));
+  rv = nghttp2_session_mem_recv2(session, buf->pos, nghttp2_buf_len(buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(buf) == rv);
-  CU_ASSERT(0 == ud.frame_recv_cb_called);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(buf), ==, rv);
+  assert_int(0, ==, ud.frame_recv_cb_called);
 
   item = nghttp2_session_get_next_ob_item(session);
 
-  CU_ASSERT(NULL != item);
-  CU_ASSERT(NGHTTP2_GOAWAY == item->frame.hd.type);
+  assert_not_null(item);
+  assert_uint8(NGHTTP2_GOAWAY, ==, item->frame.hd.type);
 
   nghttp2_bufs_free(&bufs);
   nghttp2_session_del(session);
@@ -1677,10 +1846,10 @@ static int response_on_begin_frame_callback(nghttp2_session *session,
     return 0;
   }
 
-  rv = nghttp2_submit_response(session, hd->stream_id, resnv, ARRLEN(resnv),
-                               NULL);
+  rv = nghttp2_submit_response2(session, hd->stream_id, resnv, ARRLEN(resnv),
+                                NULL);
 
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   return 0;
 }
@@ -1695,14 +1864,14 @@ void test_nghttp2_session_recv_headers_early_response(void) {
   nghttp2_nv *nva;
   size_t nvlen;
   nghttp2_frame frame;
-  ssize_t rv;
+  nghttp2_ssize rv;
   nghttp2_stream *stream;
 
   mem = nghttp2_mem_default();
   frame_pack_bufs_init(&bufs);
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
   callbacks.on_begin_frame_callback = response_on_begin_frame_callback;
 
   nghttp2_session_server_new(&session, &callbacks, NULL);
@@ -1717,7 +1886,7 @@ void test_nghttp2_session_recv_headers_early_response(void) {
 
   rv = nghttp2_frame_pack_headers(&bufs, &frame.headers, &deflater);
 
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   nghttp2_frame_headers_free(&frame.headers, mem);
 
@@ -1725,22 +1894,22 @@ void test_nghttp2_session_recv_headers_early_response(void) {
 
   /* Only receive 9 bytes headers, and invoke
      on_begin_frame_callback */
-  rv = nghttp2_session_mem_recv(session, buf->pos, 9);
+  rv = nghttp2_session_mem_recv2(session, buf->pos, 9);
 
-  CU_ASSERT(9 == rv);
+  assert_ptrdiff(9, ==, rv);
 
   rv = nghttp2_session_send(session);
 
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
-  rv =
-      nghttp2_session_mem_recv(session, buf->pos + 9, nghttp2_buf_len(buf) - 9);
+  rv = nghttp2_session_mem_recv2(session, buf->pos + 9,
+                                 nghttp2_buf_len(buf) - 9);
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(buf) - 9 == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(buf) - 9, ==, rv);
 
   stream = nghttp2_session_get_stream_raw(session, 1);
 
-  CU_ASSERT(stream->flags & NGHTTP2_STREAM_FLAG_CLOSED);
+  assert_true(stream->flags & NGHTTP2_STREAM_FLAG_CLOSED);
 
   nghttp2_hd_deflate_free(&deflater);
   nghttp2_session_del(session);
@@ -1755,7 +1924,7 @@ void test_nghttp2_session_recv_headers_for_closed_stream(void) {
   nghttp2_frame frame;
   nghttp2_bufs bufs;
   nghttp2_buf *buf;
-  ssize_t rv;
+  nghttp2_ssize rv;
   my_user_data ud;
   nghttp2_hd_deflater deflater;
   nghttp2_stream *stream;
@@ -1783,8 +1952,8 @@ void test_nghttp2_session_recv_headers_for_closed_stream(void) {
 
   rv = nghttp2_frame_pack_headers(&bufs, &frame.headers, &deflater);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(nghttp2_bufs_len(&bufs) > 0);
+  assert_ptrdiff(0, ==, rv);
+  assert_size(0, <, nghttp2_bufs_len(&bufs));
 
   nghttp2_frame_headers_free(&frame.headers, mem);
 
@@ -1794,38 +1963,39 @@ void test_nghttp2_session_recv_headers_for_closed_stream(void) {
   ud.header_cb_called = 0;
   ud.frame_recv_cb_called = 0;
 
-  rv = nghttp2_session_mem_recv(session, buf->pos, NGHTTP2_FRAME_HDLEN);
+  rv = nghttp2_session_mem_recv2(session, buf->pos, NGHTTP2_FRAME_HDLEN);
 
-  CU_ASSERT(NGHTTP2_FRAME_HDLEN == rv);
-  CU_ASSERT(0 == ud.header_cb_called);
-  CU_ASSERT(0 == ud.frame_recv_cb_called);
+  assert_ptrdiff(NGHTTP2_FRAME_HDLEN, ==, rv);
+  assert_int(0, ==, ud.header_cb_called);
+  assert_int(0, ==, ud.frame_recv_cb_called);
 
   stream = nghttp2_session_get_stream(session, 1);
 
-  CU_ASSERT(NULL != stream);
+  assert_not_null(stream);
 
   rv = nghttp2_submit_rst_stream(session, NGHTTP2_FLAG_NONE, 1,
                                  NGHTTP2_NO_ERROR);
 
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
-  rv = nghttp2_session_mem_send(session, &data);
+  rv = nghttp2_session_mem_send2(session, &data);
 
-  CU_ASSERT(rv > 0);
+  assert_ptrdiff(0, <, rv);
 
   stream = nghttp2_session_get_stream(session, 1);
 
-  CU_ASSERT(NULL == stream);
+  assert_null(stream);
 
   ud.header_cb_called = 0;
   ud.frame_recv_cb_called = 0;
 
-  rv = nghttp2_session_mem_recv(session, buf->pos + NGHTTP2_FRAME_HDLEN,
-                                nghttp2_buf_len(buf) - NGHTTP2_FRAME_HDLEN);
+  rv = nghttp2_session_mem_recv2(session, buf->pos + NGHTTP2_FRAME_HDLEN,
+                                 nghttp2_buf_len(buf) - NGHTTP2_FRAME_HDLEN);
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(buf) - NGHTTP2_FRAME_HDLEN == rv);
-  CU_ASSERT(0 == ud.header_cb_called);
-  CU_ASSERT(0 == ud.frame_recv_cb_called);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(buf) - NGHTTP2_FRAME_HDLEN, ==,
+                 rv);
+  assert_int(0, ==, ud.header_cb_called);
+  assert_int(0, ==, ud.frame_recv_cb_called);
 
   nghttp2_bufs_free(&bufs);
   nghttp2_hd_deflate_free(&deflater);
@@ -1840,7 +2010,7 @@ void test_nghttp2_session_recv_headers_with_extpri(void) {
   nghttp2_frame frame;
   nghttp2_bufs bufs;
   nghttp2_buf *buf;
-  ssize_t rv;
+  nghttp2_ssize rv;
   nghttp2_hd_deflater deflater;
   nghttp2_stream *stream;
   nghttp2_mem *mem;
@@ -1873,20 +2043,20 @@ void test_nghttp2_session_recv_headers_with_extpri(void) {
 
   rv = nghttp2_frame_pack_headers(&bufs, &frame.headers, &deflater);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(nghttp2_bufs_len(&bufs) > 0);
+  assert_ptrdiff(0, ==, rv);
+  assert_size(0, <, nghttp2_bufs_len(&bufs));
 
   nghttp2_frame_headers_free(&frame.headers, mem);
 
   buf = &bufs.head->buf;
   assert(nghttp2_bufs_len(&bufs) == nghttp2_buf_len(buf));
 
-  rv = nghttp2_session_mem_recv(session, buf->pos, nghttp2_buf_len(buf));
+  rv = nghttp2_session_mem_recv2(session, buf->pos, nghttp2_buf_len(buf));
 
   stream = nghttp2_session_get_stream(session, 1);
 
-  CU_ASSERT(2 == nghttp2_extpri_uint8_urgency(stream->extpri));
-  CU_ASSERT(1 == nghttp2_extpri_uint8_inc(stream->extpri));
+  assert_uint32(2, ==, nghttp2_extpri_uint8_urgency(stream->extpri));
+  assert_true(nghttp2_extpri_uint8_inc(stream->extpri));
 
   nghttp2_hd_deflate_free(&deflater);
   nghttp2_session_del(session);
@@ -1911,22 +2081,22 @@ void test_nghttp2_session_recv_headers_with_extpri(void) {
 
   rv = nghttp2_frame_pack_push_promise(&bufs, &frame.push_promise, &deflater);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(nghttp2_bufs_len(&bufs) > 0);
+  assert_ptrdiff(0, ==, rv);
+  assert_size(0, <, nghttp2_bufs_len(&bufs));
 
   nghttp2_frame_push_promise_free(&frame.push_promise, mem);
 
   buf = &bufs.head->buf;
   assert(nghttp2_bufs_len(&bufs) == nghttp2_buf_len(buf));
 
-  rv = nghttp2_session_mem_recv(session, buf->pos, nghttp2_buf_len(buf));
+  rv = nghttp2_session_mem_recv2(session, buf->pos, nghttp2_buf_len(buf));
 
   stream = nghttp2_session_get_stream(session, 2);
 
-  CU_ASSERT(NGHTTP2_EXTPRI_DEFAULT_URGENCY ==
-            nghttp2_extpri_uint8_urgency(stream->http_extpri));
-  CU_ASSERT(NGHTTP2_EXTPRI_DEFAULT_URGENCY ==
-            nghttp2_extpri_uint8_urgency(stream->extpri));
+  assert_uint32(NGHTTP2_EXTPRI_DEFAULT_URGENCY, ==,
+                nghttp2_extpri_uint8_urgency(stream->http_extpri));
+  assert_uint32(NGHTTP2_EXTPRI_DEFAULT_URGENCY, ==,
+                nghttp2_extpri_uint8_urgency(stream->extpri));
 
   nghttp2_hd_deflate_free(&deflater);
   nghttp2_session_del(session);
@@ -1938,7 +2108,7 @@ void test_nghttp2_session_server_recv_push_response(void) {
   nghttp2_session_callbacks callbacks;
   nghttp2_bufs bufs;
   nghttp2_buf *buf;
-  ssize_t rv;
+  nghttp2_ssize rv;
   my_user_data ud;
   nghttp2_mem *mem;
   nghttp2_frame frame;
@@ -1965,8 +2135,8 @@ void test_nghttp2_session_server_recv_push_response(void) {
                              nvlen);
   rv = nghttp2_frame_pack_headers(&bufs, &frame.headers, &deflater);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(nghttp2_bufs_len(&bufs) > 0);
+  assert_ptrdiff(0, ==, rv);
+  assert_size(0, <, nghttp2_bufs_len(&bufs));
 
   nghttp2_frame_headers_free(&frame.headers, mem);
 
@@ -1974,10 +2144,10 @@ void test_nghttp2_session_server_recv_push_response(void) {
 
   ud.invalid_frame_recv_cb_called = 0;
 
-  rv = nghttp2_session_mem_recv(session, buf->pos, nghttp2_buf_len(buf));
+  rv = nghttp2_session_mem_recv2(session, buf->pos, nghttp2_buf_len(buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(buf) == rv);
-  CU_ASSERT(1 == ud.invalid_frame_recv_cb_called);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(buf), ==, rv);
+  assert_int(1, ==, ud.invalid_frame_recv_cb_called);
 
   nghttp2_bufs_free(&bufs);
   nghttp2_hd_deflate_free(&deflater);
@@ -1989,7 +2159,7 @@ void test_nghttp2_session_recv_premature_headers(void) {
   nghttp2_session_callbacks callbacks;
   nghttp2_bufs bufs;
   nghttp2_buf *buf;
-  ssize_t rv;
+  nghttp2_ssize rv;
   my_user_data ud;
   nghttp2_hd_deflater deflater;
   nghttp2_outbound_item *item;
@@ -2000,7 +2170,7 @@ void test_nghttp2_session_recv_premature_headers(void) {
   frame_pack_bufs_init(&bufs);
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   nghttp2_session_server_new(&session, &callbacks, &ud);
 
@@ -2013,17 +2183,18 @@ void test_nghttp2_session_recv_premature_headers(void) {
   /* Intentionally feed payload cutting last 1 byte off */
   payloadlen = nghttp2_get_uint32(buf->pos) >> 8;
   nghttp2_put_uint32be(buf->pos, ((payloadlen - 1) << 8) + buf->pos[3]);
-  rv = nghttp2_session_mem_recv(session, buf->pos, nghttp2_buf_len(buf) - 1);
+  rv = nghttp2_session_mem_recv2(session, buf->pos, nghttp2_buf_len(buf) - 1);
 
-  CU_ASSERT((ssize_t)(nghttp2_buf_len(buf) - 1) == rv);
+  assert_ptrdiff((nghttp2_ssize)(nghttp2_buf_len(buf) - 1), ==, rv);
 
   item = nghttp2_session_get_next_ob_item(session);
 
-  CU_ASSERT(NULL != item);
-  CU_ASSERT(NGHTTP2_RST_STREAM == item->frame.hd.type);
-  CU_ASSERT(NGHTTP2_COMPRESSION_ERROR == item->frame.rst_stream.error_code);
-  CU_ASSERT(1 == item->frame.hd.stream_id);
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_not_null(item);
+  assert_uint8(NGHTTP2_RST_STREAM, ==, item->frame.hd.type);
+  assert_uint32(NGHTTP2_COMPRESSION_ERROR, ==,
+                item->frame.rst_stream.error_code);
+  assert_int32(1, ==, item->frame.hd.stream_id);
+  assert_int(0, ==, nghttp2_session_send(session));
 
   nghttp2_bufs_reset(&bufs);
   nghttp2_hd_deflate_free(&deflater);
@@ -2039,23 +2210,24 @@ void test_nghttp2_session_recv_premature_headers(void) {
   rv = pack_push_promise(&bufs, &deflater, 1, NGHTTP2_FLAG_END_HEADERS, 2,
                          reqnv, ARRLEN(reqnv), mem);
 
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   buf = &bufs.head->buf;
   payloadlen = nghttp2_get_uint32(buf->pos) >> 8;
   /* Intentionally feed payload cutting last 1 byte off */
   nghttp2_put_uint32be(buf->pos, ((payloadlen - 1) << 8) + buf->pos[3]);
-  rv = nghttp2_session_mem_recv(session, buf->pos, nghttp2_buf_len(buf) - 1);
+  rv = nghttp2_session_mem_recv2(session, buf->pos, nghttp2_buf_len(buf) - 1);
 
-  CU_ASSERT((ssize_t)(nghttp2_buf_len(buf) - 1) == rv);
+  assert_ptrdiff((nghttp2_ssize)(nghttp2_buf_len(buf) - 1), ==, rv);
 
   item = nghttp2_session_get_next_ob_item(session);
 
-  CU_ASSERT(NULL != item);
-  CU_ASSERT(NGHTTP2_RST_STREAM == item->frame.hd.type);
-  CU_ASSERT(NGHTTP2_COMPRESSION_ERROR == item->frame.rst_stream.error_code);
-  CU_ASSERT(2 == item->frame.hd.stream_id);
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_not_null(item);
+  assert_uint8(NGHTTP2_RST_STREAM, ==, item->frame.hd.type);
+  assert_uint32(NGHTTP2_COMPRESSION_ERROR, ==,
+                item->frame.rst_stream.error_code);
+  assert_int32(2, ==, item->frame.hd.stream_id);
+  assert_int(0, ==, nghttp2_session_send(session));
 
   nghttp2_hd_deflate_free(&deflater);
   nghttp2_session_del(session);
@@ -2069,7 +2241,7 @@ void test_nghttp2_session_recv_unknown_frame(void) {
   uint8_t data[16384];
   size_t datalen;
   nghttp2_frame_hd hd;
-  ssize_t rv;
+  nghttp2_ssize rv;
 
   nghttp2_frame_hd_init(&hd, 16000, 99, NGHTTP2_FLAG_NONE, 0);
 
@@ -2084,11 +2256,11 @@ void test_nghttp2_session_recv_unknown_frame(void) {
   ud.frame_recv_cb_called = 0;
 
   /* Unknown frame must be ignored */
-  rv = nghttp2_session_mem_recv(session, data, datalen);
+  rv = nghttp2_session_mem_recv2(session, data, datalen);
 
-  CU_ASSERT(rv == (ssize_t)datalen);
-  CU_ASSERT(0 == ud.frame_recv_cb_called);
-  CU_ASSERT(NULL == nghttp2_session_get_next_ob_item(session));
+  assert_ptrdiff(rv, ==, (nghttp2_ssize)datalen);
+  assert_int(0, ==, ud.frame_recv_cb_called);
+  assert_null(nghttp2_session_get_next_ob_item(session));
 
   nghttp2_session_del(session);
 }
@@ -2100,7 +2272,7 @@ void test_nghttp2_session_recv_unexpected_continuation(void) {
   uint8_t data[16384];
   size_t datalen;
   nghttp2_frame_hd hd;
-  ssize_t rv;
+  nghttp2_ssize rv;
   nghttp2_outbound_item *item;
 
   nghttp2_frame_hd_init(&hd, 16000, NGHTTP2_CONTINUATION,
@@ -2119,14 +2291,14 @@ void test_nghttp2_session_recv_unexpected_continuation(void) {
   ud.frame_recv_cb_called = 0;
 
   /* unexpected CONTINUATION must be treated as connection error */
-  rv = nghttp2_session_mem_recv(session, data, datalen);
+  rv = nghttp2_session_mem_recv2(session, data, datalen);
 
-  CU_ASSERT(rv == (ssize_t)datalen);
-  CU_ASSERT(0 == ud.frame_recv_cb_called);
+  assert_ptrdiff(rv, ==, (nghttp2_ssize)datalen);
+  assert_int(0, ==, ud.frame_recv_cb_called);
 
   item = nghttp2_session_get_next_ob_item(session);
 
-  CU_ASSERT(NGHTTP2_GOAWAY == item->frame.hd.type);
+  assert_uint8(NGHTTP2_GOAWAY, ==, item->frame.hd.type);
 
   nghttp2_session_del(session);
 }
@@ -2137,7 +2309,7 @@ void test_nghttp2_session_recv_settings_header_table_size(void) {
   nghttp2_frame frame;
   nghttp2_bufs bufs;
   nghttp2_buf *buf;
-  ssize_t rv;
+  nghttp2_ssize rv;
   my_user_data ud;
   nghttp2_settings_entry iv[3];
   nghttp2_nv nv = MAKE_NV(":authority", "example.org");
@@ -2148,7 +2320,7 @@ void test_nghttp2_session_recv_settings_header_table_size(void) {
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
   callbacks.on_frame_recv_callback = on_frame_recv_callback;
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   nghttp2_session_client_new(&session, &callbacks, &ud);
 
@@ -2163,8 +2335,8 @@ void test_nghttp2_session_recv_settings_header_table_size(void) {
 
   rv = nghttp2_frame_pack_settings(&bufs, &frame.settings);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(nghttp2_bufs_len(&bufs) > 0);
+  assert_ptrdiff(0, ==, rv);
+  assert_size(0, <, nghttp2_bufs_len(&bufs));
 
   nghttp2_frame_settings_free(&frame.settings, mem);
 
@@ -2173,13 +2345,13 @@ void test_nghttp2_session_recv_settings_header_table_size(void) {
 
   ud.frame_recv_cb_called = 0;
 
-  rv = nghttp2_session_mem_recv(session, buf->pos, nghttp2_buf_len(buf));
+  rv = nghttp2_session_mem_recv2(session, buf->pos, nghttp2_buf_len(buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(buf) == rv);
-  CU_ASSERT(1 == ud.frame_recv_cb_called);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(buf), ==, rv);
+  assert_int(1, ==, ud.frame_recv_cb_called);
 
-  CU_ASSERT(3000 == session->remote_settings.header_table_size);
-  CU_ASSERT(16384 == session->remote_settings.initial_window_size);
+  assert_uint32(3000, ==, session->remote_settings.header_table_size);
+  assert_uint32(16384, ==, session->remote_settings.initial_window_size);
 
   nghttp2_bufs_reset(&bufs);
 
@@ -2198,8 +2370,8 @@ void test_nghttp2_session_recv_settings_header_table_size(void) {
 
   rv = nghttp2_frame_pack_settings(&bufs, &frame.settings);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(nghttp2_bufs_len(&bufs) > 0);
+  assert_ptrdiff(0, ==, rv);
+  assert_size(0, <, nghttp2_bufs_len(&bufs));
 
   nghttp2_frame_settings_free(&frame.settings, mem);
 
@@ -2208,23 +2380,23 @@ void test_nghttp2_session_recv_settings_header_table_size(void) {
 
   ud.frame_recv_cb_called = 0;
 
-  rv = nghttp2_session_mem_recv(session, buf->pos, nghttp2_buf_len(buf));
+  rv = nghttp2_session_mem_recv2(session, buf->pos, nghttp2_buf_len(buf));
 
-  CU_ASSERT((ssize_t)(nghttp2_buf_len(buf)) == rv);
-  CU_ASSERT(1 == ud.frame_recv_cb_called);
+  assert_ptrdiff((nghttp2_ssize)(nghttp2_buf_len(buf)), ==, rv);
+  assert_int(1, ==, ud.frame_recv_cb_called);
 
-  CU_ASSERT(3001 == session->remote_settings.header_table_size);
-  CU_ASSERT(16383 == session->remote_settings.initial_window_size);
+  assert_uint32(3001, ==, session->remote_settings.header_table_size);
+  assert_uint32(16383, ==, session->remote_settings.initial_window_size);
 
   nghttp2_bufs_reset(&bufs);
 
   /* 2 SETTINGS_HEADER_TABLE_SIZE; first entry clears dynamic header
      table. */
 
-  nghttp2_submit_request(session, NULL, &nv, 1, NULL, NULL);
+  nghttp2_submit_request2(session, NULL, &nv, 1, NULL, NULL);
   nghttp2_session_send(session);
 
-  CU_ASSERT(0 < session->hd_deflater.ctx.hd_table.len);
+  assert_size(0, <, session->hd_deflater.ctx.hd_table.len);
 
   iv[0].settings_id = NGHTTP2_SETTINGS_HEADER_TABLE_SIZE;
   iv[0].value = 0;
@@ -2240,8 +2412,8 @@ void test_nghttp2_session_recv_settings_header_table_size(void) {
 
   rv = nghttp2_frame_pack_settings(&bufs, &frame.settings);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(nghttp2_bufs_len(&bufs) > 0);
+  assert_ptrdiff(0, ==, rv);
+  assert_size(0, <, nghttp2_bufs_len(&bufs));
 
   nghttp2_frame_settings_free(&frame.settings, mem);
 
@@ -2250,24 +2422,24 @@ void test_nghttp2_session_recv_settings_header_table_size(void) {
 
   ud.frame_recv_cb_called = 0;
 
-  rv = nghttp2_session_mem_recv(session, buf->pos, nghttp2_buf_len(buf));
+  rv = nghttp2_session_mem_recv2(session, buf->pos, nghttp2_buf_len(buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(buf) == rv);
-  CU_ASSERT(1 == ud.frame_recv_cb_called);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(buf), ==, rv);
+  assert_int(1, ==, ud.frame_recv_cb_called);
 
-  CU_ASSERT(4096 == session->remote_settings.header_table_size);
-  CU_ASSERT(16382 == session->remote_settings.initial_window_size);
-  CU_ASSERT(0 == session->hd_deflater.ctx.hd_table.len);
+  assert_uint32(4096, ==, session->remote_settings.header_table_size);
+  assert_uint32(16382, ==, session->remote_settings.initial_window_size);
+  assert_size(0, ==, session->hd_deflater.ctx.hd_table.len);
 
   nghttp2_bufs_reset(&bufs);
 
   /* 2 SETTINGS_HEADER_TABLE_SIZE; second entry clears dynamic header
      table. */
 
-  nghttp2_submit_request(session, NULL, &nv, 1, NULL, NULL);
+  nghttp2_submit_request2(session, NULL, &nv, 1, NULL, NULL);
   nghttp2_session_send(session);
 
-  CU_ASSERT(0 < session->hd_deflater.ctx.hd_table.len);
+  assert_size(0, <, session->hd_deflater.ctx.hd_table.len);
 
   iv[0].settings_id = NGHTTP2_SETTINGS_HEADER_TABLE_SIZE;
   iv[0].value = 3000;
@@ -2283,8 +2455,8 @@ void test_nghttp2_session_recv_settings_header_table_size(void) {
 
   rv = nghttp2_frame_pack_settings(&bufs, &frame.settings);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(nghttp2_bufs_len(&bufs) > 0);
+  assert_ptrdiff(0, ==, rv);
+  assert_size(0, <, nghttp2_bufs_len(&bufs));
 
   nghttp2_frame_settings_free(&frame.settings, mem);
 
@@ -2293,14 +2465,14 @@ void test_nghttp2_session_recv_settings_header_table_size(void) {
 
   ud.frame_recv_cb_called = 0;
 
-  rv = nghttp2_session_mem_recv(session, buf->pos, nghttp2_buf_len(buf));
+  rv = nghttp2_session_mem_recv2(session, buf->pos, nghttp2_buf_len(buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(buf) == rv);
-  CU_ASSERT(1 == ud.frame_recv_cb_called);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(buf), ==, rv);
+  assert_int(1, ==, ud.frame_recv_cb_called);
 
-  CU_ASSERT(0 == session->remote_settings.header_table_size);
-  CU_ASSERT(16381 == session->remote_settings.initial_window_size);
-  CU_ASSERT(0 == session->hd_deflater.ctx.hd_table.len);
+  assert_uint32(0, ==, session->remote_settings.header_table_size);
+  assert_uint32(16381, ==, session->remote_settings.initial_window_size);
+  assert_size(0, ==, session->hd_deflater.ctx.hd_table.len);
 
   nghttp2_bufs_reset(&bufs);
 
@@ -2325,12 +2497,13 @@ void test_nghttp2_session_recv_too_large_frame_length(void) {
 
   nghttp2_frame_pack_frame_hd(buf, &hd);
 
-  CU_ASSERT(sizeof(buf) == nghttp2_session_mem_recv(session, buf, sizeof(buf)));
+  assert_ptrdiff(sizeof(buf), ==,
+                 nghttp2_session_mem_recv2(session, buf, sizeof(buf)));
 
   item = nghttp2_session_get_next_ob_item(session);
 
-  CU_ASSERT(item != NULL);
-  CU_ASSERT(NGHTTP2_GOAWAY == item->frame.hd.type);
+  assert_not_null(item);
+  assert_uint8(NGHTTP2_GOAWAY, ==, item->frame.hd.type);
 
   nghttp2_session_del(session);
 }
@@ -2343,7 +2516,7 @@ void test_nghttp2_session_recv_extension(void) {
   nghttp2_frame_hd hd;
   nghttp2_mem *mem;
   const char data[] = "Hello World!";
-  ssize_t rv;
+  nghttp2_ssize rv;
   nghttp2_option *option;
 
   mem = nghttp2_mem_default();
@@ -2368,13 +2541,13 @@ void test_nghttp2_session_recv_extension(void) {
   nghttp2_session_client_new2(&session, &callbacks, &ud, option);
 
   nghttp2_frame_hd_init(&ud.recv_frame_hd, 0, 0, 0, 0);
-  rv = nghttp2_session_mem_recv(session, buf.pos, nghttp2_buf_len(&buf));
+  rv = nghttp2_session_mem_recv2(session, buf.pos, nghttp2_buf_len(&buf));
 
-  CU_ASSERT(NGHTTP2_FRAME_HDLEN + hd.length == (size_t)rv);
-  CU_ASSERT(111 == ud.recv_frame_hd.type);
-  CU_ASSERT(0xab == ud.recv_frame_hd.flags);
-  CU_ASSERT(1000000007 == ud.recv_frame_hd.stream_id);
-  CU_ASSERT(0 == memcmp(data, ud.scratchbuf.pos, sizeof(data)));
+  assert_size(NGHTTP2_FRAME_HDLEN + hd.length, ==, (size_t)rv);
+  assert_uint8(111, ==, ud.recv_frame_hd.type);
+  assert_uint8(0xab, ==, ud.recv_frame_hd.flags);
+  assert_int32(1000000007, ==, ud.recv_frame_hd.stream_id);
+  assert_memory_equal(sizeof(data), data, ud.scratchbuf.pos);
 
   nghttp2_session_del(session);
 
@@ -2387,10 +2560,10 @@ void test_nghttp2_session_recv_extension(void) {
   nghttp2_session_server_new2(&session, &callbacks, &ud, option);
 
   ud.frame_recv_cb_called = 0;
-  rv = nghttp2_session_mem_recv(session, buf.pos, nghttp2_buf_len(&buf));
+  rv = nghttp2_session_mem_recv2(session, buf.pos, nghttp2_buf_len(&buf));
 
-  CU_ASSERT(NGHTTP2_FRAME_HDLEN + hd.length == (size_t)rv);
-  CU_ASSERT(0 == ud.frame_recv_cb_called);
+  assert_size(NGHTTP2_FRAME_HDLEN + hd.length, ==, (size_t)rv);
+  assert_int(0, ==, ud.frame_recv_cb_called);
 
   nghttp2_session_del(session);
 
@@ -2403,10 +2576,10 @@ void test_nghttp2_session_recv_extension(void) {
   nghttp2_session_server_new2(&session, &callbacks, &ud, option);
 
   ud.frame_recv_cb_called = 0;
-  rv = nghttp2_session_mem_recv(session, buf.pos, nghttp2_buf_len(&buf));
+  rv = nghttp2_session_mem_recv2(session, buf.pos, nghttp2_buf_len(&buf));
 
-  CU_ASSERT(NGHTTP2_FRAME_HDLEN + hd.length == (size_t)rv);
-  CU_ASSERT(0 == ud.frame_recv_cb_called);
+  assert_size(NGHTTP2_FRAME_HDLEN + hd.length, ==, (size_t)rv);
+  assert_int(0, ==, ud.frame_recv_cb_called);
 
   nghttp2_session_del(session);
 
@@ -2423,7 +2596,7 @@ void test_nghttp2_session_recv_altsvc(void) {
   nghttp2_buf buf;
   nghttp2_frame_hd hd;
   nghttp2_mem *mem;
-  ssize_t rv;
+  nghttp2_ssize rv;
   nghttp2_option *option;
   static const uint8_t origin[] = "nghttp2.org";
   static const uint8_t field_value[] = "h2=\":443\"";
@@ -2453,13 +2626,13 @@ void test_nghttp2_session_recv_altsvc(void) {
   buf.last = nghttp2_cpymem(buf.last, field_value, sizeof(field_value) - 1);
 
   ud.frame_recv_cb_called = 0;
-  rv = nghttp2_session_mem_recv(session, buf.pos, nghttp2_buf_len(&buf));
+  rv = nghttp2_session_mem_recv2(session, buf.pos, nghttp2_buf_len(&buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&buf) == rv);
-  CU_ASSERT(1 == ud.frame_recv_cb_called);
-  CU_ASSERT(NGHTTP2_ALTSVC == ud.recv_frame_hd.type);
-  CU_ASSERT(NGHTTP2_FLAG_NONE == ud.recv_frame_hd.flags);
-  CU_ASSERT(0 == ud.recv_frame_hd.stream_id);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&buf), ==, rv);
+  assert_int(1, ==, ud.frame_recv_cb_called);
+  assert_uint8(NGHTTP2_ALTSVC, ==, ud.recv_frame_hd.type);
+  assert_uint8(NGHTTP2_FLAG_NONE, ==, ud.recv_frame_hd.flags);
+  assert_int32(0, ==, ud.recv_frame_hd.stream_id);
 
   nghttp2_session_del(session);
 
@@ -2477,10 +2650,10 @@ void test_nghttp2_session_recv_altsvc(void) {
   buf.last = nghttp2_cpymem(buf.last, origin, sizeof(origin) - 1 - 1);
 
   ud.frame_recv_cb_called = 0;
-  rv = nghttp2_session_mem_recv(session, buf.pos, nghttp2_buf_len(&buf));
+  rv = nghttp2_session_mem_recv2(session, buf.pos, nghttp2_buf_len(&buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&buf) == rv);
-  CU_ASSERT(0 == ud.frame_recv_cb_called);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&buf), ==, rv);
+  assert_int(0, ==, ud.frame_recv_cb_called);
 
   nghttp2_session_del(session);
 
@@ -2498,10 +2671,10 @@ void test_nghttp2_session_recv_altsvc(void) {
   buf.last = nghttp2_cpymem(buf.last, origin, sizeof(origin) - 1);
 
   ud.invalid_frame_recv_cb_called = 0;
-  rv = nghttp2_session_mem_recv(session, buf.pos, nghttp2_buf_len(&buf));
+  rv = nghttp2_session_mem_recv2(session, buf.pos, nghttp2_buf_len(&buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&buf) == rv);
-  CU_ASSERT(1 == ud.invalid_frame_recv_cb_called);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&buf), ==, rv);
+  assert_int(1, ==, ud.invalid_frame_recv_cb_called);
 
   nghttp2_session_del(session);
 
@@ -2522,10 +2695,10 @@ void test_nghttp2_session_recv_altsvc(void) {
   buf.last = nghttp2_cpymem(buf.last, field_value, sizeof(field_value) - 1);
 
   ud.invalid_frame_recv_cb_called = 0;
-  rv = nghttp2_session_mem_recv(session, buf.pos, nghttp2_buf_len(&buf));
+  rv = nghttp2_session_mem_recv2(session, buf.pos, nghttp2_buf_len(&buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&buf) == rv);
-  CU_ASSERT(1 == ud.invalid_frame_recv_cb_called);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&buf), ==, rv);
+  assert_int(1, ==, ud.invalid_frame_recv_cb_called);
 
   nghttp2_session_del(session);
 
@@ -2543,10 +2716,10 @@ void test_nghttp2_session_recv_altsvc(void) {
   buf.last = nghttp2_cpymem(buf.last, field_value, sizeof(field_value) - 1);
 
   ud.invalid_frame_recv_cb_called = 0;
-  rv = nghttp2_session_mem_recv(session, buf.pos, nghttp2_buf_len(&buf));
+  rv = nghttp2_session_mem_recv2(session, buf.pos, nghttp2_buf_len(&buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&buf) == rv);
-  CU_ASSERT(1 == ud.invalid_frame_recv_cb_called);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&buf), ==, rv);
+  assert_int(1, ==, ud.invalid_frame_recv_cb_called);
 
   nghttp2_session_del(session);
 
@@ -2566,12 +2739,12 @@ void test_nghttp2_session_recv_altsvc(void) {
   buf.last += nghttp2_buf_avail(&buf);
 
   ud.frame_recv_cb_called = 0;
-  rv = nghttp2_session_mem_recv(session, buf.pos, nghttp2_buf_len(&buf));
+  rv = nghttp2_session_mem_recv2(session, buf.pos, nghttp2_buf_len(&buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&buf) == rv);
-  CU_ASSERT(1 == ud.frame_recv_cb_called);
-  CU_ASSERT(NGHTTP2_ALTSVC == ud.recv_frame_hd.type);
-  CU_ASSERT(NGHTTP2_MAX_FRAME_SIZE_MIN == ud.recv_frame_hd.length);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&buf), ==, rv);
+  assert_int(1, ==, ud.frame_recv_cb_called);
+  assert_uint8(NGHTTP2_ALTSVC, ==, ud.recv_frame_hd.type);
+  assert_size(NGHTTP2_MAX_FRAME_SIZE_MIN, ==, ud.recv_frame_hd.length);
 
   nghttp2_session_del(session);
 
@@ -2593,10 +2766,10 @@ void test_nghttp2_session_recv_altsvc(void) {
   buf.last += nghttp2_buf_avail(&buf);
 
   ud.frame_recv_cb_called = 0;
-  rv = nghttp2_session_mem_recv(session, buf.pos, nghttp2_buf_len(&buf));
+  rv = nghttp2_session_mem_recv2(session, buf.pos, nghttp2_buf_len(&buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&buf) == rv);
-  CU_ASSERT(0 == ud.frame_recv_cb_called);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&buf), ==, rv);
+  assert_int(0, ==, ud.frame_recv_cb_called);
 
   nghttp2_session_del(session);
 
@@ -2615,10 +2788,10 @@ void test_nghttp2_session_recv_altsvc(void) {
   buf.last = nghttp2_cpymem(buf.last, field_value, sizeof(field_value) - 1);
 
   ud.frame_recv_cb_called = 0;
-  rv = nghttp2_session_mem_recv(session, buf.pos, nghttp2_buf_len(&buf));
+  rv = nghttp2_session_mem_recv2(session, buf.pos, nghttp2_buf_len(&buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&buf) == rv);
-  CU_ASSERT(0 == ud.frame_recv_cb_called);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&buf), ==, rv);
+  assert_int(0, ==, ud.frame_recv_cb_called);
 
   nghttp2_session_del(session);
 
@@ -2631,7 +2804,7 @@ void test_nghttp2_session_recv_origin(void) {
   nghttp2_session_callbacks callbacks;
   my_user_data ud;
   nghttp2_bufs bufs;
-  ssize_t rv;
+  nghttp2_ssize rv;
   nghttp2_option *option;
   nghttp2_extension frame;
   nghttp2_ext_origin origin;
@@ -2658,17 +2831,17 @@ void test_nghttp2_session_recv_origin(void) {
 
   rv = nghttp2_frame_pack_origin(&bufs, &frame);
 
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   ud.frame_recv_cb_called = 0;
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_bufs_len(&bufs));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_bufs_len(&bufs));
 
-  CU_ASSERT((ssize_t)nghttp2_bufs_len(&bufs) == rv);
-  CU_ASSERT(1 == ud.frame_recv_cb_called);
-  CU_ASSERT(NGHTTP2_ORIGIN == ud.recv_frame_hd.type);
-  CU_ASSERT(NGHTTP2_FLAG_NONE == ud.recv_frame_hd.flags);
-  CU_ASSERT(0 == ud.recv_frame_hd.stream_id);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_bufs_len(&bufs), ==, rv);
+  assert_int(1, ==, ud.frame_recv_cb_called);
+  assert_uint8(NGHTTP2_ORIGIN, ==, ud.recv_frame_hd.type);
+  assert_uint8(NGHTTP2_FLAG_NONE, ==, ud.recv_frame_hd.flags);
+  assert_int32(0, ==, ud.recv_frame_hd.stream_id);
 
   nghttp2_session_del(session);
   nghttp2_bufs_reset(&bufs);
@@ -2679,17 +2852,17 @@ void test_nghttp2_session_recv_origin(void) {
   nghttp2_frame_origin_init(&frame, &ov, 1);
   rv = nghttp2_frame_pack_origin(&bufs, &frame);
 
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   nghttp2_put_uint16be(bufs.head->buf.pos + NGHTTP2_FRAME_HDLEN,
                        (uint16_t)sizeof(nghttp2));
 
   ud.frame_recv_cb_called = 0;
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_bufs_len(&bufs));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_bufs_len(&bufs));
 
-  CU_ASSERT((ssize_t)nghttp2_bufs_len(&bufs) == rv);
-  CU_ASSERT(0 == ud.frame_recv_cb_called);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_bufs_len(&bufs), ==, rv);
+  assert_int(0, ==, ud.frame_recv_cb_called);
 
   nghttp2_session_del(session);
   nghttp2_bufs_reset(&bufs);
@@ -2702,14 +2875,14 @@ void test_nghttp2_session_recv_origin(void) {
   frame.hd.stream_id = 1;
   rv = nghttp2_frame_pack_origin(&bufs, &frame);
 
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   ud.frame_recv_cb_called = 0;
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_bufs_len(&bufs));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_bufs_len(&bufs));
 
-  CU_ASSERT((ssize_t)nghttp2_bufs_len(&bufs) == rv);
-  CU_ASSERT(0 == ud.frame_recv_cb_called);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_bufs_len(&bufs), ==, rv);
+  assert_int(0, ==, ud.frame_recv_cb_called);
 
   nghttp2_session_del(session);
   nghttp2_bufs_reset(&bufs);
@@ -2721,14 +2894,14 @@ void test_nghttp2_session_recv_origin(void) {
   frame.hd.flags = 0xf0;
   rv = nghttp2_frame_pack_origin(&bufs, &frame);
 
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   ud.frame_recv_cb_called = 0;
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_bufs_len(&bufs));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_bufs_len(&bufs));
 
-  CU_ASSERT((ssize_t)nghttp2_bufs_len(&bufs) == rv);
-  CU_ASSERT(0 == ud.frame_recv_cb_called);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_bufs_len(&bufs), ==, rv);
+  assert_int(0, ==, ud.frame_recv_cb_called);
 
   nghttp2_session_del(session);
   nghttp2_bufs_reset(&bufs);
@@ -2739,14 +2912,14 @@ void test_nghttp2_session_recv_origin(void) {
   nghttp2_frame_origin_init(&frame, &ov, 1);
   rv = nghttp2_frame_pack_origin(&bufs, &frame);
 
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   ud.frame_recv_cb_called = 0;
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_bufs_len(&bufs));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_bufs_len(&bufs));
 
-  CU_ASSERT((ssize_t)nghttp2_bufs_len(&bufs) == rv);
-  CU_ASSERT(0 == ud.frame_recv_cb_called);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_bufs_len(&bufs), ==, rv);
+  assert_int(0, ==, ud.frame_recv_cb_called);
 
   nghttp2_session_del(session);
   nghttp2_bufs_reset(&bufs);
@@ -2757,15 +2930,15 @@ void test_nghttp2_session_recv_origin(void) {
   nghttp2_frame_origin_init(&frame, NULL, 0);
   rv = nghttp2_frame_pack_origin(&bufs, &frame);
 
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   ud.frame_recv_cb_called = 0;
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_bufs_len(&bufs));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_bufs_len(&bufs));
 
-  CU_ASSERT((ssize_t)nghttp2_bufs_len(&bufs) == rv);
-  CU_ASSERT(1 == ud.frame_recv_cb_called);
-  CU_ASSERT(NGHTTP2_ORIGIN == ud.recv_frame_hd.type);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_bufs_len(&bufs), ==, rv);
+  assert_int(1, ==, ud.frame_recv_cb_called);
+  assert_uint8(NGHTTP2_ORIGIN, ==, ud.recv_frame_hd.type);
 
   nghttp2_session_del(session);
 
@@ -2778,7 +2951,7 @@ void test_nghttp2_session_recv_priority_update(void) {
   nghttp2_session_callbacks callbacks;
   my_user_data ud;
   nghttp2_bufs bufs;
-  ssize_t rv;
+  nghttp2_ssize rv;
   nghttp2_option *option;
   nghttp2_extension frame;
   nghttp2_ext_priority_update priority_update;
@@ -2820,19 +2993,19 @@ void test_nghttp2_session_recv_priority_update(void) {
   open_recv_stream(session, 1);
 
   ud.frame_recv_cb_called = 0;
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_bufs_len(&bufs));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_bufs_len(&bufs));
 
-  CU_ASSERT((ssize_t)nghttp2_bufs_len(&bufs) == rv);
-  CU_ASSERT(1 == ud.frame_recv_cb_called);
-  CU_ASSERT(NGHTTP2_PRIORITY_UPDATE == ud.recv_frame_hd.type);
-  CU_ASSERT(NGHTTP2_FLAG_NONE == ud.recv_frame_hd.flags);
-  CU_ASSERT(0 == ud.recv_frame_hd.stream_id);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_bufs_len(&bufs), ==, rv);
+  assert_int(1, ==, ud.frame_recv_cb_called);
+  assert_uint8(NGHTTP2_PRIORITY_UPDATE, ==, ud.recv_frame_hd.type);
+  assert_uint8(NGHTTP2_FLAG_NONE, ==, ud.recv_frame_hd.flags);
+  assert_int32(0, ==, ud.recv_frame_hd.stream_id);
 
   stream = nghttp2_session_get_stream_raw(session, 1);
 
-  CU_ASSERT(2 == nghttp2_extpri_uint8_urgency(stream->extpri));
-  CU_ASSERT(1 == nghttp2_extpri_uint8_inc(stream->extpri));
+  assert_uint32(2, ==, nghttp2_extpri_uint8_urgency(stream->extpri));
+  assert_true(nghttp2_extpri_uint8_inc(stream->extpri));
 
   nghttp2_session_del(session);
   nghttp2_bufs_reset(&bufs);
@@ -2849,38 +3022,38 @@ void test_nghttp2_session_recv_priority_update(void) {
   nghttp2_frame_pack_priority_update(&bufs, &frame);
 
   ud.frame_recv_cb_called = 0;
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_bufs_len(&bufs));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_bufs_len(&bufs));
 
-  CU_ASSERT((ssize_t)nghttp2_bufs_len(&bufs) == rv);
-  CU_ASSERT(1 == ud.frame_recv_cb_called);
-  CU_ASSERT(NGHTTP2_PRIORITY_UPDATE == ud.recv_frame_hd.type);
-  CU_ASSERT(NGHTTP2_FLAG_NONE == ud.recv_frame_hd.flags);
-  CU_ASSERT(0 == ud.recv_frame_hd.stream_id);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_bufs_len(&bufs), ==, rv);
+  assert_int(1, ==, ud.frame_recv_cb_called);
+  assert_uint8(NGHTTP2_PRIORITY_UPDATE, ==, ud.recv_frame_hd.type);
+  assert_uint8(NGHTTP2_FLAG_NONE, ==, ud.recv_frame_hd.flags);
+  assert_int32(0, ==, ud.recv_frame_hd.stream_id);
 
   stream = nghttp2_session_get_stream_raw(session, 1);
 
-  CU_ASSERT(NGHTTP2_STREAM_IDLE == stream->state);
-  CU_ASSERT(2 == nghttp2_extpri_uint8_urgency(stream->extpri));
-  CU_ASSERT(1 == nghttp2_extpri_uint8_inc(stream->extpri));
+  assert_enum(nghttp2_stream_state, NGHTTP2_STREAM_IDLE, ==, stream->state);
+  assert_uint32(2, ==, nghttp2_extpri_uint8_urgency(stream->extpri));
+  assert_true(nghttp2_extpri_uint8_inc(stream->extpri));
 
   nghttp2_hd_deflate_init(&deflater, mem);
   nghttp2_bufs_reset(&bufs);
   rv = pack_headers(&bufs, &deflater, 1, NGHTTP2_FLAG_END_HEADERS, reqnv,
                     ARRLEN(reqnv), mem);
 
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   ud.frame_recv_cb_called = 0;
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_bufs_len(&bufs));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_bufs_len(&bufs));
 
-  CU_ASSERT((ssize_t)nghttp2_bufs_len(&bufs) == rv);
-  CU_ASSERT(1 == ud.frame_recv_cb_called);
-  CU_ASSERT(NGHTTP2_HEADERS == ud.recv_frame_hd.type);
-  CU_ASSERT(NGHTTP2_STREAM_OPENING == stream->state);
-  CU_ASSERT(2 == nghttp2_extpri_uint8_urgency(stream->extpri));
-  CU_ASSERT(1 == nghttp2_extpri_uint8_inc(stream->extpri));
+  assert_ptrdiff((nghttp2_ssize)nghttp2_bufs_len(&bufs), ==, rv);
+  assert_int(1, ==, ud.frame_recv_cb_called);
+  assert_uint8(NGHTTP2_HEADERS, ==, ud.recv_frame_hd.type);
+  assert_enum(nghttp2_stream_state, NGHTTP2_STREAM_OPENING, ==, stream->state);
+  assert_uint32(2, ==, nghttp2_extpri_uint8_urgency(stream->extpri));
+  assert_true(nghttp2_extpri_uint8_inc(stream->extpri));
 
   nghttp2_hd_deflate_free(&deflater);
 
@@ -2900,15 +3073,15 @@ void test_nghttp2_session_recv_priority_update(void) {
   open_recv_stream(session, 1);
 
   ud.frame_recv_cb_called = 0;
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_bufs_len(&bufs));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_bufs_len(&bufs));
 
-  CU_ASSERT((ssize_t)nghttp2_bufs_len(&bufs) == rv);
-  CU_ASSERT(0 == ud.frame_recv_cb_called);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_bufs_len(&bufs), ==, rv);
+  assert_int(0, ==, ud.frame_recv_cb_called);
 
   stream = nghttp2_session_get_stream_raw(session, 1);
 
-  CU_ASSERT(NGHTTP2_EXTPRI_DEFAULT_URGENCY == stream->extpri);
+  assert_uint32(NGHTTP2_EXTPRI_DEFAULT_URGENCY, ==, stream->extpri);
 
   nghttp2_session_del(session);
   nghttp2_bufs_reset(&bufs);
@@ -2926,15 +3099,15 @@ void test_nghttp2_session_recv_priority_update(void) {
   open_sent_stream(session, 1);
 
   ud.frame_recv_cb_called = 0;
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_bufs_len(&bufs));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_bufs_len(&bufs));
 
-  CU_ASSERT((ssize_t)nghttp2_bufs_len(&bufs) == rv);
-  CU_ASSERT(0 == ud.frame_recv_cb_called);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_bufs_len(&bufs), ==, rv);
+  assert_int(0, ==, ud.frame_recv_cb_called);
 
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(NGHTTP2_GOAWAY == item->frame.hd.type);
-  CU_ASSERT(NGHTTP2_PROTOCOL_ERROR == item->frame.goaway.error_code);
+  assert_uint8(NGHTTP2_GOAWAY, ==, item->frame.hd.type);
+  assert_uint32(NGHTTP2_PROTOCOL_ERROR, ==, item->frame.goaway.error_code);
 
   nghttp2_session_del(session);
   nghttp2_bufs_reset(&bufs);
@@ -2953,23 +3126,23 @@ void test_nghttp2_session_recv_priority_update(void) {
     nghttp2_frame_pack_priority_update(&bufs, &frame);
 
     ud.frame_recv_cb_called = 0;
-    rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                  nghttp2_bufs_len(&bufs));
+    rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                   nghttp2_bufs_len(&bufs));
 
     if (i < 100) {
-      CU_ASSERT((ssize_t)nghttp2_bufs_len(&bufs) == rv);
-      CU_ASSERT(1 == ud.frame_recv_cb_called);
-      CU_ASSERT(NGHTTP2_PRIORITY_UPDATE == ud.recv_frame_hd.type);
+      assert_ptrdiff((nghttp2_ssize)nghttp2_bufs_len(&bufs), ==, rv);
+      assert_int(1, ==, ud.frame_recv_cb_called);
+      assert_uint8(NGHTTP2_PRIORITY_UPDATE, ==, ud.recv_frame_hd.type);
     } else {
-      CU_ASSERT(0 == ud.frame_recv_cb_called);
+      assert_int(0, ==, ud.frame_recv_cb_called);
     }
 
     nghttp2_bufs_reset(&bufs);
   }
 
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(NGHTTP2_GOAWAY == item->frame.hd.type);
-  CU_ASSERT(NGHTTP2_PROTOCOL_ERROR == item->frame.goaway.error_code);
+  assert_uint8(NGHTTP2_GOAWAY, ==, item->frame.hd.type);
+  assert_uint32(NGHTTP2_PROTOCOL_ERROR, ==, item->frame.goaway.error_code);
 
   nghttp2_session_del(session);
   nghttp2_option_del(option);
@@ -2986,7 +3159,7 @@ void test_nghttp2_session_continue(void) {
   nghttp2_bufs bufs;
   nghttp2_buf *buf;
   size_t framelen1, framelen2;
-  ssize_t rv;
+  nghttp2_ssize rv;
   uint8_t buffer[4096];
   nghttp2_buf databuf;
   nghttp2_frame frame;
@@ -3002,7 +3175,7 @@ void test_nghttp2_session_continue(void) {
   nghttp2_buf_wrap_init(&databuf, buffer, sizeof(buffer));
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
   callbacks.on_frame_recv_callback = on_frame_recv_callback;
   callbacks.on_data_chunk_recv_callback = pause_on_data_chunk_recv_callback;
   callbacks.on_header_callback = pause_on_header_callback;
@@ -3021,8 +3194,8 @@ void test_nghttp2_session_continue(void) {
                              NGHTTP2_HCAT_HEADERS, NULL, nva, nvlen);
   rv = nghttp2_frame_pack_headers(&bufs, &frame.headers, &deflater);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(nghttp2_bufs_len(&bufs) > 0);
+  assert_ptrdiff(0, ==, rv);
+  assert_size(0, <, nghttp2_bufs_len(&bufs));
 
   nghttp2_frame_headers_free(&frame.headers, mem);
 
@@ -3039,8 +3212,8 @@ void test_nghttp2_session_continue(void) {
   nghttp2_bufs_reset(&bufs);
   rv = nghttp2_frame_pack_headers(&bufs, &frame.headers, &deflater);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(nghttp2_bufs_len(&bufs) > 0);
+  assert_ptrdiff(0, ==, rv);
+  assert_size(0, <, nghttp2_bufs_len(&bufs));
 
   nghttp2_frame_headers_free(&frame.headers, mem);
 
@@ -3052,80 +3225,80 @@ void test_nghttp2_session_continue(void) {
   /* Receive 1st HEADERS and pause */
   user_data.begin_headers_cb_called = 0;
   user_data.header_cb_called = 0;
-  rv =
-      nghttp2_session_mem_recv(session, databuf.pos, nghttp2_buf_len(&databuf));
+  rv = nghttp2_session_mem_recv2(session, databuf.pos,
+                                 nghttp2_buf_len(&databuf));
 
-  CU_ASSERT(rv >= 0);
+  assert_ptrdiff(0, <=, rv);
   databuf.pos += rv;
 
   recv_frame = user_data.frame;
-  CU_ASSERT(NGHTTP2_HEADERS == recv_frame->hd.type);
-  CU_ASSERT(framelen1 - NGHTTP2_FRAME_HDLEN == recv_frame->hd.length);
+  assert_uint8(NGHTTP2_HEADERS, ==, recv_frame->hd.type);
+  assert_size(framelen1 - NGHTTP2_FRAME_HDLEN, ==, recv_frame->hd.length);
 
-  CU_ASSERT(1 == user_data.begin_headers_cb_called);
-  CU_ASSERT(1 == user_data.header_cb_called);
+  assert_int(1, ==, user_data.begin_headers_cb_called);
+  assert_int(1, ==, user_data.header_cb_called);
 
-  CU_ASSERT(nghttp2_nv_equal(&nv1[0], &user_data.nv));
+  assert_true(nghttp2_nv_equal(&nv1[0], &user_data.nv));
 
   /* get 2nd header field */
   user_data.begin_headers_cb_called = 0;
   user_data.header_cb_called = 0;
-  rv =
-      nghttp2_session_mem_recv(session, databuf.pos, nghttp2_buf_len(&databuf));
+  rv = nghttp2_session_mem_recv2(session, databuf.pos,
+                                 nghttp2_buf_len(&databuf));
 
-  CU_ASSERT(rv >= 0);
+  assert_ptrdiff(0, <=, rv);
   databuf.pos += rv;
 
-  CU_ASSERT(0 == user_data.begin_headers_cb_called);
-  CU_ASSERT(1 == user_data.header_cb_called);
+  assert_int(0, ==, user_data.begin_headers_cb_called);
+  assert_int(1, ==, user_data.header_cb_called);
 
-  CU_ASSERT(nghttp2_nv_equal(&nv1[1], &user_data.nv));
+  assert_true(nghttp2_nv_equal(&nv1[1], &user_data.nv));
 
   /* will call end_headers_callback and receive 2nd HEADERS and pause */
   user_data.begin_headers_cb_called = 0;
   user_data.header_cb_called = 0;
-  rv =
-      nghttp2_session_mem_recv(session, databuf.pos, nghttp2_buf_len(&databuf));
+  rv = nghttp2_session_mem_recv2(session, databuf.pos,
+                                 nghttp2_buf_len(&databuf));
 
-  CU_ASSERT(rv >= 0);
+  assert_ptrdiff(0, <=, rv);
   databuf.pos += rv;
 
   recv_frame = user_data.frame;
-  CU_ASSERT(NGHTTP2_HEADERS == recv_frame->hd.type);
-  CU_ASSERT(framelen2 - NGHTTP2_FRAME_HDLEN == recv_frame->hd.length);
+  assert_uint8(NGHTTP2_HEADERS, ==, recv_frame->hd.type);
+  assert_size(framelen2 - NGHTTP2_FRAME_HDLEN, ==, recv_frame->hd.length);
 
-  CU_ASSERT(1 == user_data.begin_headers_cb_called);
-  CU_ASSERT(1 == user_data.header_cb_called);
+  assert_int(1, ==, user_data.begin_headers_cb_called);
+  assert_int(1, ==, user_data.header_cb_called);
 
-  CU_ASSERT(nghttp2_nv_equal(&nv2[0], &user_data.nv));
+  assert_true(nghttp2_nv_equal(&nv2[0], &user_data.nv));
 
   /* get 2nd header field */
   user_data.begin_headers_cb_called = 0;
   user_data.header_cb_called = 0;
-  rv =
-      nghttp2_session_mem_recv(session, databuf.pos, nghttp2_buf_len(&databuf));
+  rv = nghttp2_session_mem_recv2(session, databuf.pos,
+                                 nghttp2_buf_len(&databuf));
 
-  CU_ASSERT(rv >= 0);
+  assert_ptrdiff(0, <=, rv);
   databuf.pos += rv;
 
-  CU_ASSERT(0 == user_data.begin_headers_cb_called);
-  CU_ASSERT(1 == user_data.header_cb_called);
+  assert_int(0, ==, user_data.begin_headers_cb_called);
+  assert_int(1, ==, user_data.header_cb_called);
 
-  CU_ASSERT(nghttp2_nv_equal(&nv2[1], &user_data.nv));
+  assert_true(nghttp2_nv_equal(&nv2[1], &user_data.nv));
 
   /* No input data, frame_recv_callback is called */
   user_data.begin_headers_cb_called = 0;
   user_data.header_cb_called = 0;
   user_data.frame_recv_cb_called = 0;
-  rv =
-      nghttp2_session_mem_recv(session, databuf.pos, nghttp2_buf_len(&databuf));
+  rv = nghttp2_session_mem_recv2(session, databuf.pos,
+                                 nghttp2_buf_len(&databuf));
 
-  CU_ASSERT(rv >= 0);
+  assert_ptrdiff(0, <=, rv);
   databuf.pos += rv;
 
-  CU_ASSERT(0 == user_data.begin_headers_cb_called);
-  CU_ASSERT(0 == user_data.header_cb_called);
-  CU_ASSERT(1 == user_data.frame_recv_cb_called);
+  assert_int(0, ==, user_data.begin_headers_cb_called);
+  assert_int(0, ==, user_data.header_cb_called);
+  assert_int(1, ==, user_data.frame_recv_cb_called);
 
   /* Receive DATA */
   nghttp2_frame_hd_init(&data_hd, 16, NGHTTP2_DATA, NGHTTP2_FLAG_NONE, 1);
@@ -3138,26 +3311,26 @@ void test_nghttp2_session_continue(void) {
   databuf.last = databuf.end;
 
   user_data.frame_recv_cb_called = 0;
-  rv =
-      nghttp2_session_mem_recv(session, databuf.pos, nghttp2_buf_len(&databuf));
+  rv = nghttp2_session_mem_recv2(session, databuf.pos,
+                                 nghttp2_buf_len(&databuf));
 
-  CU_ASSERT(16 + NGHTTP2_FRAME_HDLEN == rv);
-  CU_ASSERT(0 == user_data.frame_recv_cb_called);
+  assert_ptrdiff(16 + NGHTTP2_FRAME_HDLEN, ==, rv);
+  assert_int(0, ==, user_data.frame_recv_cb_called);
 
-  /* Next nghttp2_session_mem_recv invokes on_frame_recv_callback and
+  /* Next nghttp2_session_mem_recv2 invokes on_frame_recv_callback and
      pause again in on_data_chunk_recv_callback since we pass same
      DATA frame. */
   user_data.frame_recv_cb_called = 0;
-  rv =
-      nghttp2_session_mem_recv(session, databuf.pos, nghttp2_buf_len(&databuf));
-  CU_ASSERT(16 + NGHTTP2_FRAME_HDLEN == rv);
-  CU_ASSERT(1 == user_data.frame_recv_cb_called);
+  rv = nghttp2_session_mem_recv2(session, databuf.pos,
+                                 nghttp2_buf_len(&databuf));
+  assert_ptrdiff(16 + NGHTTP2_FRAME_HDLEN, ==, rv);
+  assert_int(1, ==, user_data.frame_recv_cb_called);
 
   /* And finally call on_frame_recv_callback with 0 size input */
   user_data.frame_recv_cb_called = 0;
-  rv = nghttp2_session_mem_recv(session, NULL, 0);
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(1 == user_data.frame_recv_cb_called);
+  rv = nghttp2_session_mem_recv2(session, NULL, 0);
+  assert_ptrdiff(0, ==, rv);
+  assert_int(1, ==, user_data.frame_recv_cb_called);
 
   nghttp2_bufs_free(&bufs);
   nghttp2_hd_deflate_free(&deflater);
@@ -3177,12 +3350,13 @@ void test_nghttp2_session_add_frame(void) {
 
   mem = nghttp2_mem_default();
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = accumulator_send_callback;
+  callbacks.send_callback2 = accumulator_send_callback;
 
   acc.length = 0;
   user_data.acc = &acc;
 
-  CU_ASSERT(0 == nghttp2_session_client_new(&session, &callbacks, &user_data));
+  assert_int(0, ==,
+             nghttp2_session_client_new(&session, &callbacks, &user_data));
 
   item = mem->malloc(sizeof(nghttp2_outbound_item), NULL);
 
@@ -3199,13 +3373,14 @@ void test_nghttp2_session_add_frame(void) {
 
   session->next_stream_id += 2;
 
-  CU_ASSERT(0 == nghttp2_session_add_item(session, item));
-  CU_ASSERT(NULL != nghttp2_outbound_queue_top(&session->ob_syn));
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(NGHTTP2_HEADERS == acc.buf[3]);
-  CU_ASSERT((NGHTTP2_FLAG_END_HEADERS | NGHTTP2_FLAG_PRIORITY) == acc.buf[4]);
+  assert_int(0, ==, nghttp2_session_add_item(session, item));
+  assert_not_null(nghttp2_outbound_queue_top(&session->ob_syn));
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_uint8(NGHTTP2_HEADERS, ==, acc.buf[3]);
+  assert_uint8((NGHTTP2_FLAG_END_HEADERS | NGHTTP2_FLAG_PRIORITY), ==,
+               acc.buf[4]);
   /* check stream id */
-  CU_ASSERT(1 == nghttp2_get_uint32(&acc.buf[5]));
+  assert_uint32(1, ==, nghttp2_get_uint32(&acc.buf[5]));
 
   nghttp2_session_del(session);
 }
@@ -3239,11 +3414,12 @@ void test_nghttp2_session_on_request_headers_received(void) {
   user_data.begin_headers_cb_called = 0;
   user_data.invalid_frame_recv_cb_called = 0;
 
-  CU_ASSERT(0 == nghttp2_session_on_request_headers_received(session, &frame));
-  CU_ASSERT(1 == user_data.begin_headers_cb_called);
+  assert_int(0, ==,
+             nghttp2_session_on_request_headers_received(session, &frame));
+  assert_int(1, ==, user_data.begin_headers_cb_called);
   stream = nghttp2_session_get_stream(session, stream_id);
-  CU_ASSERT(NGHTTP2_STREAM_OPENING == stream->state);
-  CU_ASSERT(255 == stream->weight);
+  assert_enum(nghttp2_stream_state, NGHTTP2_STREAM_OPENING, ==, stream->state);
+  assert_int32(255, ==, stream->weight);
 
   nghttp2_frame_headers_free(&frame.headers, mem);
 
@@ -3253,10 +3429,10 @@ void test_nghttp2_session_on_request_headers_received(void) {
                              NGHTTP2_FLAG_END_HEADERS | NGHTTP2_FLAG_PRIORITY,
                              3, NGHTTP2_HCAT_HEADERS, NULL, NULL, 0);
   user_data.invalid_frame_recv_cb_called = 0;
-  CU_ASSERT(NGHTTP2_ERR_IGN_HEADER_BLOCK ==
-            nghttp2_session_on_request_headers_received(session, &frame));
-  CU_ASSERT(1 == user_data.invalid_frame_recv_cb_called);
-  CU_ASSERT(0 == (session->goaway_flags & NGHTTP2_GOAWAY_TERM_ON_SEND));
+  assert_int(NGHTTP2_ERR_IGN_HEADER_BLOCK, ==,
+             nghttp2_session_on_request_headers_received(session, &frame));
+  assert_int(1, ==, user_data.invalid_frame_recv_cb_called);
+  assert_false(session->goaway_flags & NGHTTP2_GOAWAY_TERM_ON_SEND);
 
   nghttp2_frame_headers_free(&frame.headers, mem);
   session->local_settings.max_concurrent_streams =
@@ -3268,10 +3444,10 @@ void test_nghttp2_session_on_request_headers_received(void) {
                              NGHTTP2_FLAG_END_HEADERS | NGHTTP2_FLAG_PRIORITY,
                              3, NGHTTP2_HCAT_HEADERS, NULL, NULL, 0);
   user_data.invalid_frame_recv_cb_called = 0;
-  CU_ASSERT(NGHTTP2_ERR_IGN_HEADER_BLOCK ==
-            nghttp2_session_on_request_headers_received(session, &frame));
-  CU_ASSERT(0 == user_data.invalid_frame_recv_cb_called);
-  CU_ASSERT(0 == (session->goaway_flags & NGHTTP2_GOAWAY_TERM_ON_SEND));
+  assert_int(NGHTTP2_ERR_IGN_HEADER_BLOCK, ==,
+             nghttp2_session_on_request_headers_received(session, &frame));
+  assert_int(0, ==, user_data.invalid_frame_recv_cb_called);
+  assert_false(session->goaway_flags & NGHTTP2_GOAWAY_TERM_ON_SEND);
 
   nghttp2_frame_headers_free(&frame.headers, mem);
 
@@ -3281,10 +3457,10 @@ void test_nghttp2_session_on_request_headers_received(void) {
                              NGHTTP2_FLAG_END_HEADERS | NGHTTP2_FLAG_PRIORITY,
                              2, NGHTTP2_HCAT_HEADERS, NULL, NULL, 0);
   user_data.invalid_frame_recv_cb_called = 0;
-  CU_ASSERT(NGHTTP2_ERR_IGN_HEADER_BLOCK ==
-            nghttp2_session_on_request_headers_received(session, &frame));
-  CU_ASSERT(1 == user_data.invalid_frame_recv_cb_called);
-  CU_ASSERT(session->goaway_flags & NGHTTP2_GOAWAY_TERM_ON_SEND);
+  assert_int(NGHTTP2_ERR_IGN_HEADER_BLOCK, ==,
+             nghttp2_session_on_request_headers_received(session, &frame));
+  assert_int(1, ==, user_data.invalid_frame_recv_cb_called);
+  assert_true(session->goaway_flags & NGHTTP2_GOAWAY_TERM_ON_SEND);
 
   nghttp2_frame_headers_free(&frame.headers, mem);
 
@@ -3300,9 +3476,10 @@ void test_nghttp2_session_on_request_headers_received(void) {
                              1, NGHTTP2_HCAT_HEADERS, NULL, nva, nvlen);
   user_data.begin_headers_cb_called = 0;
   user_data.invalid_frame_recv_cb_called = 0;
-  CU_ASSERT(0 == nghttp2_session_on_request_headers_received(session, &frame));
-  CU_ASSERT(1 == user_data.begin_headers_cb_called);
-  CU_ASSERT(0 == user_data.invalid_frame_recv_cb_called);
+  assert_int(0, ==,
+             nghttp2_session_on_request_headers_received(session, &frame));
+  assert_int(1, ==, user_data.begin_headers_cb_called);
+  assert_int(0, ==, user_data.invalid_frame_recv_cb_called);
 
   nghttp2_frame_headers_free(&frame.headers, mem);
 
@@ -3316,10 +3493,10 @@ void test_nghttp2_session_on_request_headers_received(void) {
                              NGHTTP2_HCAT_REQUEST, NULL, NULL, 0);
 
   user_data.invalid_frame_recv_cb_called = 0;
-  CU_ASSERT(NGHTTP2_ERR_IGN_HEADER_BLOCK ==
-            nghttp2_session_on_request_headers_received(session, &frame));
-  CU_ASSERT(1 == user_data.invalid_frame_recv_cb_called);
-  CU_ASSERT(session->goaway_flags & NGHTTP2_GOAWAY_TERM_ON_SEND);
+  assert_int(NGHTTP2_ERR_IGN_HEADER_BLOCK, ==,
+             nghttp2_session_on_request_headers_received(session, &frame));
+  assert_int(1, ==, user_data.invalid_frame_recv_cb_called);
+  assert_true(session->goaway_flags & NGHTTP2_GOAWAY_TERM_ON_SEND);
 
   nghttp2_frame_headers_free(&frame.headers, mem);
 
@@ -3332,10 +3509,10 @@ void test_nghttp2_session_on_request_headers_received(void) {
                              NGHTTP2_HCAT_REQUEST, NULL, NULL, 0);
 
   user_data.invalid_frame_recv_cb_called = 0;
-  CU_ASSERT(NGHTTP2_ERR_IGN_HEADER_BLOCK ==
-            nghttp2_session_on_request_headers_received(session, &frame));
-  CU_ASSERT(1 == user_data.invalid_frame_recv_cb_called);
-  CU_ASSERT(session->goaway_flags & NGHTTP2_GOAWAY_TERM_ON_SEND);
+  assert_int(NGHTTP2_ERR_IGN_HEADER_BLOCK, ==,
+             nghttp2_session_on_request_headers_received(session, &frame));
+  assert_int(1, ==, user_data.invalid_frame_recv_cb_called);
+  assert_true(session->goaway_flags & NGHTTP2_GOAWAY_TERM_ON_SEND);
 
   nghttp2_frame_headers_free(&frame.headers, mem);
 
@@ -3352,10 +3529,10 @@ void test_nghttp2_session_on_request_headers_received(void) {
                              NGHTTP2_HCAT_REQUEST, NULL, NULL, 0);
 
   user_data.invalid_frame_recv_cb_called = 0;
-  CU_ASSERT(NGHTTP2_ERR_IGN_HEADER_BLOCK ==
-            nghttp2_session_on_request_headers_received(session, &frame));
-  CU_ASSERT(0 == user_data.invalid_frame_recv_cb_called);
-  CU_ASSERT(0 == (session->goaway_flags & NGHTTP2_GOAWAY_TERM_ON_SEND));
+  assert_int(NGHTTP2_ERR_IGN_HEADER_BLOCK, ==,
+             nghttp2_session_on_request_headers_received(session, &frame));
+  assert_int(0, ==, user_data.invalid_frame_recv_cb_called);
+  assert_false(session->goaway_flags & NGHTTP2_GOAWAY_TERM_ON_SEND);
 
   nghttp2_frame_headers_free(&frame.headers, mem);
 
@@ -3369,7 +3546,8 @@ void test_nghttp2_session_on_request_headers_received(void) {
   nghttp2_frame_headers_init(&frame.headers, NGHTTP2_FLAG_END_HEADERS, 3,
                              NGHTTP2_HCAT_REQUEST, NULL, NULL, 0);
 
-  CU_ASSERT(0 == nghttp2_session_on_request_headers_received(session, &frame));
+  assert_int(0, ==,
+             nghttp2_session_on_request_headers_received(session, &frame));
 
   nghttp2_frame_headers_free(&frame.headers, mem);
 
@@ -3379,10 +3557,10 @@ void test_nghttp2_session_on_request_headers_received(void) {
 
   session->goaway_flags |= NGHTTP2_GOAWAY_SENT;
   user_data.invalid_frame_recv_cb_called = 0;
-  CU_ASSERT(NGHTTP2_ERR_IGN_HEADER_BLOCK ==
-            nghttp2_session_on_request_headers_received(session, &frame));
-  CU_ASSERT(0 == user_data.invalid_frame_recv_cb_called);
-  CU_ASSERT(0 == (session->goaway_flags & NGHTTP2_GOAWAY_TERM_ON_SEND));
+  assert_int(NGHTTP2_ERR_IGN_HEADER_BLOCK, ==,
+             nghttp2_session_on_request_headers_received(session, &frame));
+  assert_int(0, ==, user_data.invalid_frame_recv_cb_called);
+  assert_false(session->goaway_flags & NGHTTP2_GOAWAY_TERM_ON_SEND);
 
   nghttp2_frame_headers_free(&frame.headers, mem);
 
@@ -3398,9 +3576,9 @@ void test_nghttp2_session_on_request_headers_received(void) {
   nghttp2_frame_headers_init(&frame.headers, NGHTTP2_FLAG_END_HEADERS, 1,
                              NGHTTP2_HCAT_REQUEST, NULL, NULL, 0);
 
-  CU_ASSERT(NGHTTP2_ERR_IGN_HEADER_BLOCK ==
-            nghttp2_session_on_request_headers_received(session, &frame));
-  CU_ASSERT(session->goaway_flags & NGHTTP2_GOAWAY_TERM_ON_SEND);
+  assert_int(NGHTTP2_ERR_IGN_HEADER_BLOCK, ==,
+             nghttp2_session_on_request_headers_received(session, &frame));
+  assert_true(session->goaway_flags & NGHTTP2_GOAWAY_TERM_ON_SEND);
 
   nghttp2_frame_headers_free(&frame.headers, mem);
 
@@ -3428,10 +3606,11 @@ void test_nghttp2_session_on_response_headers_received(void) {
   user_data.begin_headers_cb_called = 0;
   user_data.invalid_frame_recv_cb_called = 0;
 
-  CU_ASSERT(0 == nghttp2_session_on_response_headers_received(session, &frame,
-                                                              stream));
-  CU_ASSERT(1 == user_data.begin_headers_cb_called);
-  CU_ASSERT(NGHTTP2_STREAM_OPENED == stream->state);
+  assert_int(
+      0, ==,
+      nghttp2_session_on_response_headers_received(session, &frame, stream));
+  assert_int(1, ==, user_data.begin_headers_cb_called);
+  assert_enum(nghttp2_stream_state, NGHTTP2_STREAM_OPENED, ==, stream->state);
 
   nghttp2_frame_headers_free(&frame.headers, mem);
   nghttp2_session_del(session);
@@ -3459,26 +3638,28 @@ void test_nghttp2_session_on_headers_received(void) {
   user_data.begin_headers_cb_called = 0;
   user_data.invalid_frame_recv_cb_called = 0;
 
-  CU_ASSERT(0 == nghttp2_session_on_headers_received(session, &frame, stream));
-  CU_ASSERT(1 == user_data.begin_headers_cb_called);
-  CU_ASSERT(NGHTTP2_STREAM_OPENED == stream->state);
+  assert_int(0, ==,
+             nghttp2_session_on_headers_received(session, &frame, stream));
+  assert_int(1, ==, user_data.begin_headers_cb_called);
+  assert_enum(nghttp2_stream_state, NGHTTP2_STREAM_OPENED, ==, stream->state);
 
   /* stream closed */
   frame.hd.flags |= NGHTTP2_FLAG_END_STREAM;
 
-  CU_ASSERT(0 == nghttp2_session_on_headers_received(session, &frame, stream));
-  CU_ASSERT(2 == user_data.begin_headers_cb_called);
+  assert_int(0, ==,
+             nghttp2_session_on_headers_received(session, &frame, stream));
+  assert_int(2, ==, user_data.begin_headers_cb_called);
 
   /* Check to see when NGHTTP2_STREAM_CLOSING, incoming HEADERS is
      discarded. */
   stream = open_sent_stream2(session, 3, NGHTTP2_STREAM_CLOSING);
   frame.hd.stream_id = 3;
   frame.hd.flags = NGHTTP2_FLAG_END_HEADERS;
-  CU_ASSERT(NGHTTP2_ERR_IGN_HEADER_BLOCK ==
-            nghttp2_session_on_headers_received(session, &frame, stream));
+  assert_int(NGHTTP2_ERR_IGN_HEADER_BLOCK, ==,
+             nghttp2_session_on_headers_received(session, &frame, stream));
   /* See no counters are updated */
-  CU_ASSERT(2 == user_data.begin_headers_cb_called);
-  CU_ASSERT(0 == user_data.invalid_frame_recv_cb_called);
+  assert_int(2, ==, user_data.begin_headers_cb_called);
+  assert_int(0, ==, user_data.invalid_frame_recv_cb_called);
 
   /* Server initiated stream */
   stream = open_recv_stream(session, 2);
@@ -3486,16 +3667,17 @@ void test_nghttp2_session_on_headers_received(void) {
   frame.hd.flags = NGHTTP2_FLAG_END_HEADERS | NGHTTP2_FLAG_END_STREAM;
   frame.hd.stream_id = 2;
 
-  CU_ASSERT(0 == nghttp2_session_on_headers_received(session, &frame, stream));
-  CU_ASSERT(3 == user_data.begin_headers_cb_called);
-  CU_ASSERT(NGHTTP2_STREAM_OPENED == stream->state);
+  assert_int(0, ==,
+             nghttp2_session_on_headers_received(session, &frame, stream));
+  assert_int(3, ==, user_data.begin_headers_cb_called);
+  assert_enum(nghttp2_stream_state, NGHTTP2_STREAM_OPENED, ==, stream->state);
 
   nghttp2_stream_shutdown(stream, NGHTTP2_SHUT_RD);
 
   /* Further reception of HEADERS is subject to stream error */
-  CU_ASSERT(NGHTTP2_ERR_IGN_HEADER_BLOCK ==
-            nghttp2_session_on_headers_received(session, &frame, stream));
-  CU_ASSERT(1 == user_data.invalid_frame_recv_cb_called);
+  assert_int(NGHTTP2_ERR_IGN_HEADER_BLOCK, ==,
+             nghttp2_session_on_headers_received(session, &frame, stream));
+  assert_int(1, ==, user_data.invalid_frame_recv_cb_called);
 
   nghttp2_frame_headers_free(&frame.headers, mem);
 
@@ -3513,7 +3695,7 @@ void test_nghttp2_session_on_push_response_headers_received(void) {
 
   mem = nghttp2_mem_default();
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
   callbacks.on_begin_headers_callback = on_begin_headers_callback;
   callbacks.on_invalid_frame_recv_callback = on_invalid_frame_recv_callback;
 
@@ -3528,31 +3710,32 @@ void test_nghttp2_session_on_push_response_headers_received(void) {
   user_data.begin_headers_cb_called = 0;
   user_data.invalid_frame_recv_cb_called = 0;
 
-  CU_ASSERT(1 == session->num_incoming_reserved_streams);
-  CU_ASSERT(0 == nghttp2_session_on_push_response_headers_received(
-                     session, &frame, stream));
-  CU_ASSERT(1 == user_data.begin_headers_cb_called);
-  CU_ASSERT(0 == session->num_incoming_reserved_streams);
-  CU_ASSERT(NGHTTP2_STREAM_OPENED == stream->state);
-  CU_ASSERT(1 == session->num_incoming_streams);
-  CU_ASSERT(0 == (stream->flags & NGHTTP2_STREAM_FLAG_PUSH));
+  assert_size(1, ==, session->num_incoming_reserved_streams);
+  assert_int(0, ==,
+             nghttp2_session_on_push_response_headers_received(session, &frame,
+                                                               stream));
+  assert_int(1, ==, user_data.begin_headers_cb_called);
+  assert_size(0, ==, session->num_incoming_reserved_streams);
+  assert_enum(nghttp2_stream_state, NGHTTP2_STREAM_OPENED, ==, stream->state);
+  assert_size(1, ==, session->num_incoming_streams);
+  assert_false(stream->flags & NGHTTP2_STREAM_FLAG_PUSH);
 
   /* If un-ACKed max concurrent streams limit is exceeded,
      RST_STREAMed */
   session->pending_local_max_concurrent_stream = 1;
   stream = open_recv_stream2(session, 4, NGHTTP2_STREAM_RESERVED);
   frame.hd.stream_id = 4;
-  CU_ASSERT(NGHTTP2_ERR_IGN_HEADER_BLOCK ==
-            nghttp2_session_on_push_response_headers_received(session, &frame,
-                                                              stream));
+  assert_int(NGHTTP2_ERR_IGN_HEADER_BLOCK, ==,
+             nghttp2_session_on_push_response_headers_received(session, &frame,
+                                                               stream));
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(NGHTTP2_RST_STREAM == item->frame.hd.type);
-  CU_ASSERT(NGHTTP2_REFUSED_STREAM == item->frame.rst_stream.error_code);
-  CU_ASSERT(1 == session->num_incoming_streams);
-  CU_ASSERT(1 == session->num_incoming_reserved_streams);
+  assert_uint8(NGHTTP2_RST_STREAM, ==, item->frame.hd.type);
+  assert_uint32(NGHTTP2_REFUSED_STREAM, ==, item->frame.rst_stream.error_code);
+  assert_size(1, ==, session->num_incoming_streams);
+  assert_size(1, ==, session->num_incoming_reserved_streams);
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(1 == session->num_incoming_streams);
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_size(1, ==, session->num_incoming_streams);
 
   /* If ACKed max concurrent streams limit is exceeded, GOAWAY is
      issued */
@@ -3561,14 +3744,14 @@ void test_nghttp2_session_on_push_response_headers_received(void) {
   stream = open_recv_stream2(session, 6, NGHTTP2_STREAM_RESERVED);
   frame.hd.stream_id = 6;
 
-  CU_ASSERT(NGHTTP2_ERR_IGN_HEADER_BLOCK ==
-            nghttp2_session_on_push_response_headers_received(session, &frame,
-                                                              stream));
+  assert_int(NGHTTP2_ERR_IGN_HEADER_BLOCK, ==,
+             nghttp2_session_on_push_response_headers_received(session, &frame,
+                                                               stream));
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(NGHTTP2_GOAWAY == item->frame.hd.type);
-  CU_ASSERT(NGHTTP2_PROTOCOL_ERROR == item->frame.goaway.error_code);
-  CU_ASSERT(1 == session->num_incoming_streams);
-  CU_ASSERT(1 == session->num_incoming_reserved_streams);
+  assert_uint8(NGHTTP2_GOAWAY, ==, item->frame.hd.type);
+  assert_uint32(NGHTTP2_PROTOCOL_ERROR, ==, item->frame.goaway.error_code);
+  assert_size(1, ==, session->num_incoming_streams);
+  assert_size(1, ==, session->num_incoming_reserved_streams);
 
   nghttp2_frame_headers_free(&frame.headers, mem);
   nghttp2_session_del(session);
@@ -3595,9 +3778,9 @@ void test_nghttp2_session_on_priority_received(void) {
   nghttp2_frame_priority_init(&frame.priority, 1, &pri_spec);
 
   /* depend on stream 0 */
-  CU_ASSERT(0 == nghttp2_session_on_priority_received(session, &frame));
+  assert_int(0, ==, nghttp2_session_on_priority_received(session, &frame));
 
-  CU_ASSERT(2 == stream->weight);
+  assert_int32(2, ==, stream->weight);
 
   stream = open_sent_stream(session, 2);
   dep_stream = open_recv_stream(session, 3);
@@ -3607,19 +3790,19 @@ void test_nghttp2_session_on_priority_received(void) {
   /* using dependency stream */
   nghttp2_priority_spec_init(&frame.priority.pri_spec, 3, 1, 0);
 
-  CU_ASSERT(0 == nghttp2_session_on_priority_received(session, &frame));
-  CU_ASSERT(dep_stream == stream->dep_prev);
+  assert_int(0, ==, nghttp2_session_on_priority_received(session, &frame));
+  assert_ptr_equal(dep_stream, stream->dep_prev);
 
   /* PRIORITY against idle stream */
 
   frame.hd.stream_id = 100;
 
-  CU_ASSERT(0 == nghttp2_session_on_priority_received(session, &frame));
+  assert_int(0, ==, nghttp2_session_on_priority_received(session, &frame));
 
   stream = nghttp2_session_get_stream_raw(session, frame.hd.stream_id);
 
-  CU_ASSERT(NGHTTP2_STREAM_IDLE == stream->state);
-  CU_ASSERT(dep_stream == stream->dep_prev);
+  assert_enum(nghttp2_stream_state, NGHTTP2_STREAM_IDLE, ==, stream->state);
+  assert_ptr_equal(dep_stream, stream->dep_prev);
 
   nghttp2_frame_priority_free(&frame.priority);
   nghttp2_session_del(session);
@@ -3632,11 +3815,11 @@ void test_nghttp2_session_on_priority_received(void) {
 
   nghttp2_frame_priority_init(&frame.priority, 1, &pri_spec);
 
-  CU_ASSERT(0 == nghttp2_session_on_priority_received(session, &frame));
+  assert_int(0, ==, nghttp2_session_on_priority_received(session, &frame));
 
   item = nghttp2_session_get_next_ob_item(session);
 
-  CU_ASSERT(NGHTTP2_GOAWAY == item->frame.hd.type);
+  assert_uint8(NGHTTP2_GOAWAY, ==, item->frame.hd.type);
 
   nghttp2_frame_priority_free(&frame.priority);
   nghttp2_session_del(session);
@@ -3648,11 +3831,11 @@ void test_nghttp2_session_on_priority_received(void) {
 
   nghttp2_frame_priority_init(&frame.priority, 1, &pri_spec);
 
-  CU_ASSERT(0 == nghttp2_session_on_priority_received(session, &frame));
+  assert_int(0, ==, nghttp2_session_on_priority_received(session, &frame));
 
   item = nghttp2_session_get_next_ob_item(session);
 
-  CU_ASSERT(NGHTTP2_GOAWAY == item->frame.hd.type);
+  assert_uint8(NGHTTP2_GOAWAY, ==, item->frame.hd.type);
 
   nghttp2_frame_priority_free(&frame.priority);
   nghttp2_session_del(session);
@@ -3669,8 +3852,8 @@ void test_nghttp2_session_on_rst_stream_received(void) {
 
   nghttp2_frame_rst_stream_init(&frame.rst_stream, 1, NGHTTP2_PROTOCOL_ERROR);
 
-  CU_ASSERT(0 == nghttp2_session_on_rst_stream_received(session, &frame));
-  CU_ASSERT(NULL == nghttp2_session_get_stream(session, 1));
+  assert_int(0, ==, nghttp2_session_on_rst_stream_received(session, &frame));
+  assert_null(nghttp2_session_get_stream(session, 1));
 
   nghttp2_frame_rst_stream_free(&frame.rst_stream);
   nghttp2_session_del(session);
@@ -3691,7 +3874,7 @@ void test_nghttp2_session_on_settings_received(void) {
   uint8_t data[2048];
   nghttp2_frame_hd hd;
   int rv;
-  ssize_t nread;
+  nghttp2_ssize nread;
   nghttp2_stream *stream;
 
   mem = nghttp2_mem_default();
@@ -3712,7 +3895,7 @@ void test_nghttp2_session_on_settings_received(void) {
   iv[4].value = 0;
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   nghttp2_session_client_new(&session, &callbacks, &user_data);
   session->remote_settings.initial_window_size = 16 * 1024;
@@ -3728,26 +3911,29 @@ void test_nghttp2_session_on_settings_received(void) {
   nghttp2_frame_settings_init(&frame.settings, NGHTTP2_FLAG_NONE,
                               dup_iv(iv, niv), niv);
 
-  CU_ASSERT(0 == nghttp2_session_on_settings_received(session, &frame, 0));
-  CU_ASSERT(1000000009 == session->remote_settings.max_concurrent_streams);
-  CU_ASSERT(64 * 1024 == session->remote_settings.initial_window_size);
-  CU_ASSERT(1024 == session->remote_settings.header_table_size);
-  CU_ASSERT(0 == session->remote_settings.enable_push);
+  assert_int(0, ==, nghttp2_session_on_settings_received(session, &frame, 0));
+  assert_uint32(1000000009, ==,
+                session->remote_settings.max_concurrent_streams);
+  assert_uint32(64 * 1024, ==, session->remote_settings.initial_window_size);
+  assert_uint32(1024, ==, session->remote_settings.header_table_size);
+  assert_uint32(0, ==, session->remote_settings.enable_push);
 
-  CU_ASSERT(64 * 1024 == stream1->remote_window_size);
-  CU_ASSERT(0 == stream2->remote_window_size);
+  assert_int32(64 * 1024, ==, stream1->remote_window_size);
+  assert_int32(0, ==, stream2->remote_window_size);
 
   frame.settings.iv[2].value = 16 * 1024;
 
-  CU_ASSERT(0 == nghttp2_session_on_settings_received(session, &frame, 0));
+  assert_int(0, ==, nghttp2_session_on_settings_received(session, &frame, 0));
 
-  CU_ASSERT(16 * 1024 == stream1->remote_window_size);
-  CU_ASSERT(-48 * 1024 == stream2->remote_window_size);
+  assert_int32(16 * 1024, ==, stream1->remote_window_size);
+  assert_int32(-48 * 1024, ==, stream2->remote_window_size);
 
-  CU_ASSERT(16 * 1024 == nghttp2_session_get_stream_remote_window_size(
-                             session, stream1->stream_id));
-  CU_ASSERT(0 == nghttp2_session_get_stream_remote_window_size(
-                     session, stream2->stream_id));
+  assert_int32(16 * 1024, ==,
+               nghttp2_session_get_stream_remote_window_size(
+                   session, stream1->stream_id));
+  assert_int32(0, ==,
+               nghttp2_session_get_stream_remote_window_size(
+                   session, stream2->stream_id));
 
   nghttp2_frame_settings_free(&frame.settings, mem);
 
@@ -3757,10 +3943,10 @@ void test_nghttp2_session_on_settings_received(void) {
   nghttp2_session_server_new(&session, &callbacks, NULL);
   nghttp2_frame_settings_init(&frame.settings, NGHTTP2_FLAG_ACK, dup_iv(iv, 1),
                               1);
-  CU_ASSERT(0 == nghttp2_session_on_settings_received(session, &frame, 0));
+  assert_int(0, ==, nghttp2_session_on_settings_received(session, &frame, 0));
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(item != NULL);
-  CU_ASSERT(NGHTTP2_GOAWAY == item->frame.hd.type);
+  assert_not_null(item);
+  assert_uint8(NGHTTP2_GOAWAY, ==, item->frame.hd.type);
 
   nghttp2_frame_settings_free(&frame.settings, mem);
   nghttp2_session_del(session);
@@ -3769,10 +3955,10 @@ void test_nghttp2_session_on_settings_received(void) {
   nghttp2_session_server_new(&session, &callbacks, NULL);
   nghttp2_frame_settings_init(&frame.settings, NGHTTP2_FLAG_ACK, NULL, 0);
 
-  CU_ASSERT(0 == nghttp2_session_on_settings_received(session, &frame, 0));
+  assert_int(0, ==, nghttp2_session_on_settings_received(session, &frame, 0));
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(item != NULL);
-  CU_ASSERT(NGHTTP2_GOAWAY == item->frame.hd.type);
+  assert_not_null(item);
+  assert_uint8(NGHTTP2_GOAWAY, ==, item->frame.hd.type);
 
   nghttp2_frame_settings_free(&frame.settings, mem);
   nghttp2_session_del(session);
@@ -3781,11 +3967,11 @@ void test_nghttp2_session_on_settings_received(void) {
      and header table size is once cleared to 0. */
   nghttp2_session_client_new(&session, &callbacks, NULL);
 
-  nghttp2_submit_request(session, NULL, &nv, 1, NULL, NULL);
+  nghttp2_submit_request2(session, NULL, &nv, 1, NULL, NULL);
 
   nghttp2_session_send(session);
 
-  CU_ASSERT(session->hd_deflater.ctx.hd_table.len > 0);
+  assert_size(0, <, session->hd_deflater.ctx.hd_table.len);
 
   iv[0].settings_id = NGHTTP2_SETTINGS_HEADER_TABLE_SIZE;
   iv[0].value = 0;
@@ -3796,11 +3982,11 @@ void test_nghttp2_session_on_settings_received(void) {
   nghttp2_frame_settings_init(&frame.settings, NGHTTP2_FLAG_NONE, dup_iv(iv, 2),
                               2);
 
-  CU_ASSERT(0 == nghttp2_session_on_settings_received(session, &frame, 0));
+  assert_int(0, ==, nghttp2_session_on_settings_received(session, &frame, 0));
 
-  CU_ASSERT(0 == session->hd_deflater.ctx.hd_table.len);
-  CU_ASSERT(2048 == session->hd_deflater.ctx.hd_table_bufsize_max);
-  CU_ASSERT(2048 == session->remote_settings.header_table_size);
+  assert_size(0, ==, session->hd_deflater.ctx.hd_table.len);
+  assert_size(2048, ==, session->hd_deflater.ctx.hd_table_bufsize_max);
+  assert_uint32(2048, ==, session->remote_settings.header_table_size);
 
   nghttp2_frame_settings_free(&frame.settings, mem);
   nghttp2_session_del(session);
@@ -3811,12 +3997,12 @@ void test_nghttp2_session_on_settings_received(void) {
   nghttp2_option_new(&option);
   nghttp2_option_set_peer_max_concurrent_streams(option, 1000);
   nghttp2_session_client_new2(&session, &callbacks, NULL, option);
-  CU_ASSERT(1000 == session->remote_settings.max_concurrent_streams);
+  assert_uint32(1000, ==, session->remote_settings.max_concurrent_streams);
 
   nghttp2_frame_settings_init(&frame.settings, NGHTTP2_FLAG_NONE, NULL, 0);
-  CU_ASSERT(0 == nghttp2_session_on_settings_received(session, &frame, 0));
-  CU_ASSERT(NGHTTP2_DEFAULT_MAX_CONCURRENT_STREAMS ==
-            session->remote_settings.max_concurrent_streams);
+  assert_int(0, ==, nghttp2_session_on_settings_received(session, &frame, 0));
+  assert_uint32(NGHTTP2_DEFAULT_MAX_CONCURRENT_STREAMS, ==,
+                session->remote_settings.max_concurrent_streams);
 
   nghttp2_frame_settings_free(&frame.settings, mem);
   nghttp2_session_del(session);
@@ -3831,12 +4017,12 @@ void test_nghttp2_session_on_settings_received(void) {
   nghttp2_frame_settings_init(&frame.settings, NGHTTP2_FLAG_NONE, dup_iv(iv, 1),
                               1);
 
-  CU_ASSERT(0 == nghttp2_session_on_settings_received(session, &frame, 0));
+  assert_int(0, ==, nghttp2_session_on_settings_received(session, &frame, 0));
 
   item = nghttp2_session_get_next_ob_item(session);
 
-  CU_ASSERT(item != NULL);
-  CU_ASSERT(NGHTTP2_GOAWAY == item->frame.hd.type);
+  assert_not_null(item);
+  assert_uint8(NGHTTP2_GOAWAY, ==, item->frame.hd.type);
 
   nghttp2_frame_settings_free(&frame.settings, mem);
   nghttp2_session_del(session);
@@ -3850,7 +4036,7 @@ void test_nghttp2_session_on_settings_received(void) {
   nghttp2_frame_window_update_init(&frame.window_update, NGHTTP2_FLAG_NONE, 1,
                                    1);
 
-  CU_ASSERT(0 == nghttp2_session_on_window_update_received(session, &frame));
+  assert_int(0, ==, nghttp2_session_on_window_update_received(session, &frame));
 
   nghttp2_frame_window_update_free(&frame.window_update);
 
@@ -3862,20 +4048,20 @@ void test_nghttp2_session_on_settings_received(void) {
 
   /* Now window size gets NGHTTP2_MAX_WINDOW_SIZE + 1, which is
      unacceptable situation in protocol spec. */
-  CU_ASSERT(0 == nghttp2_session_on_settings_received(session, &frame, 0));
+  assert_int(0, ==, nghttp2_session_on_settings_received(session, &frame, 0));
 
   nghttp2_frame_settings_free(&frame.settings, mem);
 
   item = nghttp2_session_get_next_ob_item(session);
 
-  CU_ASSERT(NULL != item);
-  CU_ASSERT(NGHTTP2_SETTINGS == item->frame.hd.type);
+  assert_not_null(item);
+  assert_uint8(NGHTTP2_SETTINGS, ==, item->frame.hd.type);
 
   item = nghttp2_outbound_queue_top(&session->ob_reg);
 
-  CU_ASSERT(NULL != item);
-  CU_ASSERT(NGHTTP2_RST_STREAM == item->frame.hd.type);
-  CU_ASSERT(NGHTTP2_STREAM_CLOSING == stream1->state);
+  assert_not_null(item);
+  assert_uint8(NGHTTP2_RST_STREAM, ==, item->frame.hd.type);
+  assert_enum(nghttp2_stream_state, NGHTTP2_STREAM_CLOSING, ==, stream1->state);
 
   nghttp2_session_del(session);
 
@@ -3891,14 +4077,14 @@ void test_nghttp2_session_on_settings_received(void) {
   nghttp2_frame_settings_init(&frame.settings, NGHTTP2_FLAG_NONE, dup_iv(iv, 1),
                               1);
 
-  CU_ASSERT(0 == nghttp2_session_on_settings_received(session, &frame, 0));
+  assert_int(0, ==, nghttp2_session_on_settings_received(session, &frame, 0));
 
   nghttp2_frame_settings_free(&frame.settings, mem);
 
   item = nghttp2_session_get_next_ob_item(session);
 
-  CU_ASSERT(NULL != item);
-  CU_ASSERT(NGHTTP2_GOAWAY == item->frame.hd.type);
+  assert_not_null(item);
+  assert_uint8(NGHTTP2_GOAWAY, ==, item->frame.hd.type);
 
   nghttp2_session_del(session);
 
@@ -3915,11 +4101,11 @@ void test_nghttp2_session_on_settings_received(void) {
 
   rv = nghttp2_submit_settings(session, NGHTTP2_FLAG_NONE, iv, 1);
 
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   rv = nghttp2_session_send(session);
 
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   stream = open_recv_stream(session, 1);
 
@@ -3931,31 +4117,31 @@ void test_nghttp2_session_on_settings_received(void) {
   nghttp2_frame_pack_frame_hd(data, &hd);
 
   nread =
-      nghttp2_session_mem_recv(session, data, NGHTTP2_FRAME_HDLEN + hd.length);
+      nghttp2_session_mem_recv2(session, data, NGHTTP2_FRAME_HDLEN + hd.length);
 
-  CU_ASSERT((ssize_t)(NGHTTP2_FRAME_HDLEN + hd.length) == nread);
+  assert_ptrdiff((nghttp2_ssize)(NGHTTP2_FRAME_HDLEN + hd.length), ==, nread);
 
   rv = nghttp2_session_consume(session, 1, hd.length);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT((int32_t)hd.length == stream->recv_window_size);
-  CU_ASSERT((int32_t)hd.length == stream->consumed_size);
+  assert_int(0, ==, rv);
+  assert_int32((int32_t)hd.length, ==, stream->recv_window_size);
+  assert_int32((int32_t)hd.length, ==, stream->consumed_size);
 
   nghttp2_frame_settings_init(&frame.settings, NGHTTP2_FLAG_ACK, NULL, 0);
 
   rv = nghttp2_session_on_settings_received(session, &frame, 0);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(1024 == stream->local_window_size);
-  CU_ASSERT(0 == stream->recv_window_size);
-  CU_ASSERT(0 == stream->consumed_size);
+  assert_int(0, ==, rv);
+  assert_int32(1024, ==, stream->local_window_size);
+  assert_int32(0, ==, stream->recv_window_size);
+  assert_int32(0, ==, stream->consumed_size);
 
   item = nghttp2_session_get_next_ob_item(session);
 
-  CU_ASSERT(NULL != item);
-  CU_ASSERT(NGHTTP2_WINDOW_UPDATE == item->frame.hd.type);
-  CU_ASSERT((int32_t)hd.length ==
-            item->frame.window_update.window_size_increment);
+  assert_not_null(item);
+  assert_uint8(NGHTTP2_WINDOW_UPDATE, ==, item->frame.hd.type);
+  assert_int32((int32_t)hd.length, ==,
+               item->frame.window_update.window_size_increment);
 
   nghttp2_session_del(session);
   nghttp2_option_del(option);
@@ -3972,14 +4158,14 @@ void test_nghttp2_session_on_settings_received(void) {
   nghttp2_frame_settings_init(&frame.settings, NGHTTP2_FLAG_NONE, dup_iv(iv, 1),
                               1);
 
-  CU_ASSERT(0 == nghttp2_session_on_settings_received(session, &frame, 0));
+  assert_int(0, ==, nghttp2_session_on_settings_received(session, &frame, 0));
 
   nghttp2_frame_settings_free(&frame.settings, mem);
 
   item = nghttp2_session_get_next_ob_item(session);
 
-  CU_ASSERT(NULL != item);
-  CU_ASSERT(NGHTTP2_GOAWAY == item->frame.hd.type);
+  assert_not_null(item);
+  assert_uint8(NGHTTP2_GOAWAY, ==, item->frame.hd.type);
 
   nghttp2_session_del(session);
 }
@@ -3999,7 +4185,7 @@ void test_nghttp2_session_on_push_promise_received(void) {
 
   mem = nghttp2_mem_default();
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
   callbacks.on_begin_headers_callback = on_begin_headers_callback;
   callbacks.on_invalid_frame_recv_callback = on_invalid_frame_recv_callback;
 
@@ -4013,13 +4199,14 @@ void test_nghttp2_session_on_push_promise_received(void) {
   user_data.begin_headers_cb_called = 0;
   user_data.invalid_frame_recv_cb_called = 0;
 
-  CU_ASSERT(0 == nghttp2_session_on_push_promise_received(session, &frame));
+  assert_int(0, ==, nghttp2_session_on_push_promise_received(session, &frame));
 
-  CU_ASSERT(1 == user_data.begin_headers_cb_called);
-  CU_ASSERT(1 == session->num_incoming_reserved_streams);
+  assert_int(1, ==, user_data.begin_headers_cb_called);
+  assert_size(1, ==, session->num_incoming_reserved_streams);
   promised_stream = nghttp2_session_get_stream(session, 2);
-  CU_ASSERT(NGHTTP2_STREAM_RESERVED == promised_stream->state);
-  CU_ASSERT(2 == session->last_recv_stream_id);
+  assert_enum(nghttp2_stream_state, NGHTTP2_STREAM_RESERVED, ==,
+              promised_stream->state);
+  assert_int32(2, ==, session->last_recv_stream_id);
 
   /* Attempt to PUSH_PROMISE against half close (remote) */
   nghttp2_stream_shutdown(stream, NGHTTP2_SHUT_RD);
@@ -4027,18 +4214,18 @@ void test_nghttp2_session_on_push_promise_received(void) {
 
   user_data.begin_headers_cb_called = 0;
   user_data.invalid_frame_recv_cb_called = 0;
-  CU_ASSERT(NGHTTP2_ERR_IGN_HEADER_BLOCK ==
-            nghttp2_session_on_push_promise_received(session, &frame));
+  assert_int(NGHTTP2_ERR_IGN_HEADER_BLOCK, ==,
+             nghttp2_session_on_push_promise_received(session, &frame));
 
-  CU_ASSERT(0 == user_data.begin_headers_cb_called);
-  CU_ASSERT(1 == user_data.invalid_frame_recv_cb_called);
-  CU_ASSERT(1 == session->num_incoming_reserved_streams);
-  CU_ASSERT(NULL == nghttp2_session_get_stream(session, 4));
+  assert_int(0, ==, user_data.begin_headers_cb_called);
+  assert_int(1, ==, user_data.invalid_frame_recv_cb_called);
+  assert_size(1, ==, session->num_incoming_reserved_streams);
+  assert_null(nghttp2_session_get_stream(session, 4));
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(NGHTTP2_GOAWAY == item->frame.hd.type);
-  CU_ASSERT(NGHTTP2_STREAM_CLOSED == item->frame.goaway.error_code);
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(4 == session->last_recv_stream_id);
+  assert_uint8(NGHTTP2_GOAWAY, ==, item->frame.hd.type);
+  assert_uint32(NGHTTP2_STREAM_CLOSED, ==, item->frame.goaway.error_code);
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_int32(4, ==, session->last_recv_stream_id);
 
   nghttp2_session_del(session);
 
@@ -4052,17 +4239,17 @@ void test_nghttp2_session_on_push_promise_received(void) {
 
   user_data.begin_headers_cb_called = 0;
   user_data.invalid_frame_recv_cb_called = 0;
-  CU_ASSERT(NGHTTP2_ERR_IGN_HEADER_BLOCK ==
-            nghttp2_session_on_push_promise_received(session, &frame));
+  assert_int(NGHTTP2_ERR_IGN_HEADER_BLOCK, ==,
+             nghttp2_session_on_push_promise_received(session, &frame));
 
-  CU_ASSERT(0 == user_data.begin_headers_cb_called);
-  CU_ASSERT(0 == session->num_incoming_reserved_streams);
-  CU_ASSERT(NULL == nghttp2_session_get_stream(session, 6));
+  assert_int(0, ==, user_data.begin_headers_cb_called);
+  assert_size(0, ==, session->num_incoming_reserved_streams);
+  assert_null(nghttp2_session_get_stream(session, 6));
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(NGHTTP2_RST_STREAM == item->frame.hd.type);
-  CU_ASSERT(6 == item->frame.hd.stream_id);
-  CU_ASSERT(NGHTTP2_CANCEL == item->frame.rst_stream.error_code);
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_uint8(NGHTTP2_RST_STREAM, ==, item->frame.hd.type);
+  assert_int32(6, ==, item->frame.hd.stream_id);
+  assert_uint32(NGHTTP2_CANCEL, ==, item->frame.rst_stream.error_code);
+  assert_int(0, ==, nghttp2_session_send(session));
 
   /* Attempt to PUSH_PROMISE against idle stream */
   frame.hd.stream_id = 3;
@@ -4070,17 +4257,17 @@ void test_nghttp2_session_on_push_promise_received(void) {
 
   user_data.begin_headers_cb_called = 0;
   user_data.invalid_frame_recv_cb_called = 0;
-  CU_ASSERT(NGHTTP2_ERR_IGN_HEADER_BLOCK ==
-            nghttp2_session_on_push_promise_received(session, &frame));
+  assert_int(NGHTTP2_ERR_IGN_HEADER_BLOCK, ==,
+             nghttp2_session_on_push_promise_received(session, &frame));
 
-  CU_ASSERT(0 == user_data.begin_headers_cb_called);
-  CU_ASSERT(0 == session->num_incoming_reserved_streams);
-  CU_ASSERT(NULL == nghttp2_session_get_stream(session, 8));
+  assert_int(0, ==, user_data.begin_headers_cb_called);
+  assert_size(0, ==, session->num_incoming_reserved_streams);
+  assert_null(nghttp2_session_get_stream(session, 8));
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(NGHTTP2_GOAWAY == item->frame.hd.type);
-  CU_ASSERT(0 == item->frame.hd.stream_id);
-  CU_ASSERT(NGHTTP2_PROTOCOL_ERROR == item->frame.goaway.error_code);
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_uint8(NGHTTP2_GOAWAY, ==, item->frame.hd.type);
+  assert_int32(0, ==, item->frame.hd.stream_id);
+  assert_uint32(NGHTTP2_PROTOCOL_ERROR, ==, item->frame.goaway.error_code);
+  assert_int(0, ==, nghttp2_session_send(session));
 
   nghttp2_session_del(session);
 
@@ -4094,37 +4281,37 @@ void test_nghttp2_session_on_push_promise_received(void) {
 
   user_data.begin_headers_cb_called = 0;
   user_data.invalid_frame_recv_cb_called = 0;
-  CU_ASSERT(0 == nghttp2_session_on_push_promise_received(session, &frame));
+  assert_int(0, ==, nghttp2_session_on_push_promise_received(session, &frame));
 
-  CU_ASSERT(1 == user_data.begin_headers_cb_called);
-  CU_ASSERT(1 == session->num_incoming_reserved_streams);
-  CU_ASSERT(NULL != nghttp2_session_get_stream(session, 2));
+  assert_int(1, ==, user_data.begin_headers_cb_called);
+  assert_size(1, ==, session->num_incoming_reserved_streams);
+  assert_not_null(nghttp2_session_get_stream(session, 2));
 
   user_data.begin_headers_cb_called = 0;
   user_data.invalid_frame_recv_cb_called = 0;
-  CU_ASSERT(NGHTTP2_ERR_IGN_HEADER_BLOCK ==
-            nghttp2_session_on_push_promise_received(session, &frame));
+  assert_int(NGHTTP2_ERR_IGN_HEADER_BLOCK, ==,
+             nghttp2_session_on_push_promise_received(session, &frame));
 
-  CU_ASSERT(0 == user_data.begin_headers_cb_called);
-  CU_ASSERT(1 == session->num_incoming_reserved_streams);
-  CU_ASSERT(NULL == nghttp2_session_get_stream(session, 8));
+  assert_int(0, ==, user_data.begin_headers_cb_called);
+  assert_size(1, ==, session->num_incoming_reserved_streams);
+  assert_null(nghttp2_session_get_stream(session, 8));
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(NGHTTP2_GOAWAY == item->frame.hd.type);
-  CU_ASSERT(NGHTTP2_PROTOCOL_ERROR == item->frame.goaway.error_code);
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_uint8(NGHTTP2_GOAWAY, ==, item->frame.hd.type);
+  assert_uint32(NGHTTP2_PROTOCOL_ERROR, ==, item->frame.goaway.error_code);
+  assert_int(0, ==, nghttp2_session_send(session));
 
   /* After GOAWAY, PUSH_PROMISE will be discarded */
   frame.push_promise.promised_stream_id = 10;
 
   user_data.begin_headers_cb_called = 0;
   user_data.invalid_frame_recv_cb_called = 0;
-  CU_ASSERT(NGHTTP2_ERR_IGN_HEADER_BLOCK ==
-            nghttp2_session_on_push_promise_received(session, &frame));
+  assert_int(NGHTTP2_ERR_IGN_HEADER_BLOCK, ==,
+             nghttp2_session_on_push_promise_received(session, &frame));
 
-  CU_ASSERT(0 == user_data.begin_headers_cb_called);
-  CU_ASSERT(1 == session->num_incoming_reserved_streams);
-  CU_ASSERT(NULL == nghttp2_session_get_stream(session, 10));
-  CU_ASSERT(NULL == nghttp2_session_get_next_ob_item(session));
+  assert_int(0, ==, user_data.begin_headers_cb_called);
+  assert_size(1, ==, session->num_incoming_reserved_streams);
+  assert_null(nghttp2_session_get_stream(session, 10));
+  assert_null(nghttp2_session_get_next_ob_item(session));
 
   nghttp2_frame_push_promise_free(&frame.push_promise, mem);
   nghttp2_session_del(session);
@@ -4139,12 +4326,12 @@ void test_nghttp2_session_on_push_promise_received(void) {
 
   user_data.begin_headers_cb_called = 0;
   user_data.invalid_frame_recv_cb_called = 0;
-  CU_ASSERT(NGHTTP2_ERR_IGN_HEADER_BLOCK ==
-            nghttp2_session_on_push_promise_received(session, &frame));
+  assert_int(NGHTTP2_ERR_IGN_HEADER_BLOCK, ==,
+             nghttp2_session_on_push_promise_received(session, &frame));
 
-  CU_ASSERT(0 == user_data.begin_headers_cb_called);
-  CU_ASSERT(1 == user_data.invalid_frame_recv_cb_called);
-  CU_ASSERT(1 == session->num_incoming_reserved_streams);
+  assert_int(0, ==, user_data.begin_headers_cb_called);
+  assert_int(1, ==, user_data.invalid_frame_recv_cb_called);
+  assert_size(1, ==, session->num_incoming_reserved_streams);
 
   nghttp2_frame_push_promise_free(&frame.push_promise, mem);
   nghttp2_session_del(session);
@@ -4161,12 +4348,12 @@ void test_nghttp2_session_on_push_promise_received(void) {
 
   user_data.begin_headers_cb_called = 0;
   user_data.invalid_frame_recv_cb_called = 0;
-  CU_ASSERT(NGHTTP2_ERR_IGN_HEADER_BLOCK ==
-            nghttp2_session_on_push_promise_received(session, &frame));
+  assert_int(NGHTTP2_ERR_IGN_HEADER_BLOCK, ==,
+             nghttp2_session_on_push_promise_received(session, &frame));
 
-  CU_ASSERT(0 == user_data.begin_headers_cb_called);
-  CU_ASSERT(1 == user_data.invalid_frame_recv_cb_called);
-  CU_ASSERT(0 == session->num_incoming_reserved_streams);
+  assert_int(0, ==, user_data.begin_headers_cb_called);
+  assert_int(1, ==, user_data.invalid_frame_recv_cb_called);
+  assert_size(0, ==, session->num_incoming_reserved_streams);
 
   nghttp2_frame_push_promise_free(&frame.push_promise, mem);
   nghttp2_session_del(session);
@@ -4182,10 +4369,10 @@ void test_nghttp2_session_on_push_promise_received(void) {
                                   1, 2, nva, nvlen);
   user_data.begin_headers_cb_called = 0;
   user_data.invalid_frame_recv_cb_called = 0;
-  CU_ASSERT(0 == nghttp2_session_on_push_promise_received(session, &frame));
+  assert_int(0, ==, nghttp2_session_on_push_promise_received(session, &frame));
 
-  CU_ASSERT(1 == user_data.begin_headers_cb_called);
-  CU_ASSERT(0 == user_data.invalid_frame_recv_cb_called);
+  assert_int(1, ==, user_data.begin_headers_cb_called);
+  assert_int(0, ==, user_data.invalid_frame_recv_cb_called);
 
   nghttp2_frame_push_promise_free(&frame.push_promise, mem);
   nghttp2_session_del(session);
@@ -4202,10 +4389,10 @@ void test_nghttp2_session_on_push_promise_received(void) {
   nghttp2_frame_push_promise_init(&frame.push_promise, NGHTTP2_FLAG_END_HEADERS,
                                   1, 2, NULL, 0);
 
-  CU_ASSERT(NGHTTP2_ERR_IGN_HEADER_BLOCK ==
-            nghttp2_session_on_push_promise_received(session, &frame));
+  assert_int(NGHTTP2_ERR_IGN_HEADER_BLOCK, ==,
+             nghttp2_session_on_push_promise_received(session, &frame));
 
-  CU_ASSERT(0 == session->num_incoming_reserved_streams);
+  assert_size(0, ==, session->num_incoming_reserved_streams);
 
   nghttp2_frame_push_promise_free(&frame.push_promise, mem);
   nghttp2_session_del(session);
@@ -4217,20 +4404,20 @@ void test_nghttp2_session_on_push_promise_received(void) {
   open_sent_stream(session, 1);
   open_recv_stream2(session, 2, NGHTTP2_STREAM_RESERVED);
 
-  CU_ASSERT(1 == session->num_incoming_reserved_streams);
+  assert_size(1, ==, session->num_incoming_reserved_streams);
 
   nghttp2_frame_push_promise_init(&frame.push_promise, NGHTTP2_FLAG_END_HEADERS,
                                   1, 4, NULL, 0);
 
-  CU_ASSERT(NGHTTP2_ERR_IGN_HEADER_BLOCK ==
-            nghttp2_session_on_push_promise_received(session, &frame));
+  assert_int(NGHTTP2_ERR_IGN_HEADER_BLOCK, ==,
+             nghttp2_session_on_push_promise_received(session, &frame));
 
-  CU_ASSERT(1 == session->num_incoming_reserved_streams);
+  assert_size(1, ==, session->num_incoming_reserved_streams);
 
   item = nghttp2_session_get_next_ob_item(session);
 
-  CU_ASSERT(NGHTTP2_RST_STREAM == item->frame.hd.type);
-  CU_ASSERT(NGHTTP2_CANCEL == item->frame.rst_stream.error_code);
+  assert_uint8(NGHTTP2_RST_STREAM, ==, item->frame.hd.type);
+  assert_uint32(NGHTTP2_CANCEL, ==, item->frame.rst_stream.error_code);
 
   nghttp2_frame_push_promise_free(&frame.push_promise, mem);
   nghttp2_session_del(session);
@@ -4255,22 +4442,22 @@ void test_nghttp2_session_on_ping_received(void) {
   nghttp2_session_client_new(&session, &callbacks, &user_data);
   nghttp2_frame_ping_init(&frame.ping, NGHTTP2_FLAG_ACK, opaque_data);
 
-  CU_ASSERT(0 == nghttp2_session_on_ping_received(session, &frame));
-  CU_ASSERT(1 == user_data.frame_recv_cb_called);
+  assert_int(0, ==, nghttp2_session_on_ping_received(session, &frame));
+  assert_int(1, ==, user_data.frame_recv_cb_called);
 
   /* Since this ping frame has ACK flag set, no further action is
      performed. */
-  CU_ASSERT(NULL == nghttp2_outbound_queue_top(&session->ob_urgent));
+  assert_null(nghttp2_outbound_queue_top(&session->ob_urgent));
 
   /* Clear the flag, and receive it again */
   frame.hd.flags = NGHTTP2_FLAG_NONE;
 
-  CU_ASSERT(0 == nghttp2_session_on_ping_received(session, &frame));
-  CU_ASSERT(2 == user_data.frame_recv_cb_called);
+  assert_int(0, ==, nghttp2_session_on_ping_received(session, &frame));
+  assert_int(2, ==, user_data.frame_recv_cb_called);
   top = nghttp2_outbound_queue_top(&session->ob_urgent);
-  CU_ASSERT(NGHTTP2_PING == top->frame.hd.type);
-  CU_ASSERT(NGHTTP2_FLAG_ACK == top->frame.hd.flags);
-  CU_ASSERT(memcmp(opaque_data, top->frame.ping.opaque_data, 8) == 0);
+  assert_uint8(NGHTTP2_PING, ==, top->frame.hd.type);
+  assert_uint8(NGHTTP2_FLAG_ACK, ==, top->frame.hd.flags);
+  assert_memory_equal(8, opaque_data, top->frame.ping.opaque_data);
 
   nghttp2_frame_ping_free(&frame.ping);
   nghttp2_session_del(session);
@@ -4284,9 +4471,9 @@ void test_nghttp2_session_on_ping_received(void) {
 
   user_data.frame_recv_cb_called = 0;
 
-  CU_ASSERT(0 == nghttp2_session_on_ping_received(session, &frame));
-  CU_ASSERT(1 == user_data.frame_recv_cb_called);
-  CU_ASSERT(NULL == nghttp2_outbound_queue_top(&session->ob_urgent));
+  assert_int(0, ==, nghttp2_session_on_ping_received(session, &frame));
+  assert_int(1, ==, user_data.frame_recv_cb_called);
+  assert_null(nghttp2_outbound_queue_top(&session->ob_urgent));
 
   nghttp2_frame_ping_free(&frame.ping);
   nghttp2_session_del(session);
@@ -4301,7 +4488,7 @@ void test_nghttp2_session_on_goaway_received(void) {
   int i;
   nghttp2_mem *mem;
   const uint8_t *data;
-  ssize_t datalen;
+  nghttp2_ssize datalen;
 
   mem = nghttp2_mem_default();
   user_data.frame_recv_cb_called = 0;
@@ -4326,20 +4513,20 @@ void test_nghttp2_session_on_goaway_received(void) {
 
   user_data.stream_close_cb_called = 0;
 
-  CU_ASSERT(0 == nghttp2_session_on_goaway_received(session, &frame));
+  assert_int(0, ==, nghttp2_session_on_goaway_received(session, &frame));
 
-  CU_ASSERT(1 == user_data.frame_recv_cb_called);
-  CU_ASSERT(3 == session->remote_last_stream_id);
+  assert_int(1, ==, user_data.frame_recv_cb_called);
+  assert_int32(3, ==, session->remote_last_stream_id);
   /* on_stream_close should be callsed for 2 times (stream 5 and 7) */
-  CU_ASSERT(2 == user_data.stream_close_cb_called);
+  assert_int(2, ==, user_data.stream_close_cb_called);
 
-  CU_ASSERT(NULL != nghttp2_session_get_stream(session, 1));
-  CU_ASSERT(NULL != nghttp2_session_get_stream(session, 2));
-  CU_ASSERT(NULL != nghttp2_session_get_stream(session, 3));
-  CU_ASSERT(NULL != nghttp2_session_get_stream(session, 4));
-  CU_ASSERT(NULL == nghttp2_session_get_stream(session, 5));
-  CU_ASSERT(NULL != nghttp2_session_get_stream(session, 6));
-  CU_ASSERT(NULL == nghttp2_session_get_stream(session, 7));
+  assert_not_null(nghttp2_session_get_stream(session, 1));
+  assert_not_null(nghttp2_session_get_stream(session, 2));
+  assert_not_null(nghttp2_session_get_stream(session, 3));
+  assert_not_null(nghttp2_session_get_stream(session, 4));
+  assert_null(nghttp2_session_get_stream(session, 5));
+  assert_not_null(nghttp2_session_get_stream(session, 6));
+  assert_null(nghttp2_session_get_stream(session, 7));
 
   nghttp2_frame_goaway_free(&frame.goaway, mem);
   nghttp2_session_del(session);
@@ -4355,14 +4542,14 @@ void test_nghttp2_session_on_goaway_received(void) {
 
   nghttp2_frame_goaway_init(&frame.goaway, 0, NGHTTP2_NO_ERROR, NULL, 0);
 
-  CU_ASSERT(0 == nghttp2_session_on_goaway_received(session, &frame));
+  assert_int(0, ==, nghttp2_session_on_goaway_received(session, &frame));
 
-  nghttp2_submit_request(session, NULL, reqnv, ARRLEN(reqnv), NULL, NULL);
+  nghttp2_submit_request2(session, NULL, reqnv, ARRLEN(reqnv), NULL, NULL);
 
-  datalen = nghttp2_session_mem_send(session, &data);
+  datalen = nghttp2_session_mem_send2(session, &data);
 
-  CU_ASSERT(NGHTTP2_ERR_CALLBACK_FAILURE == datalen);
-  CU_ASSERT(1 == user_data.stream_close_cb_called);
+  assert_ptrdiff(NGHTTP2_ERR_CALLBACK_FAILURE, ==, datalen);
+  assert_int(1, ==, user_data.stream_close_cb_called);
 
   nghttp2_frame_goaway_free(&frame.goaway, mem);
   nghttp2_session_del(session);
@@ -4391,23 +4578,23 @@ void test_nghttp2_session_on_window_update_received(void) {
 
   data_item = create_data_ob_item(mem);
 
-  CU_ASSERT(0 == nghttp2_stream_attach_item(stream, data_item));
+  assert_int(0, ==, nghttp2_stream_attach_item(stream, data_item));
 
   nghttp2_frame_window_update_init(&frame.window_update, NGHTTP2_FLAG_NONE, 1,
                                    16 * 1024);
 
-  CU_ASSERT(0 == nghttp2_session_on_window_update_received(session, &frame));
-  CU_ASSERT(1 == user_data.frame_recv_cb_called);
-  CU_ASSERT(NGHTTP2_INITIAL_WINDOW_SIZE + 16 * 1024 ==
-            stream->remote_window_size);
+  assert_int(0, ==, nghttp2_session_on_window_update_received(session, &frame));
+  assert_int(1, ==, user_data.frame_recv_cb_called);
+  assert_int32(NGHTTP2_INITIAL_WINDOW_SIZE + 16 * 1024, ==,
+               stream->remote_window_size);
 
   nghttp2_stream_defer_item(stream, NGHTTP2_STREAM_FLAG_DEFERRED_FLOW_CONTROL);
 
-  CU_ASSERT(0 == nghttp2_session_on_window_update_received(session, &frame));
-  CU_ASSERT(2 == user_data.frame_recv_cb_called);
-  CU_ASSERT(NGHTTP2_INITIAL_WINDOW_SIZE + 16 * 1024 * 2 ==
-            stream->remote_window_size);
-  CU_ASSERT(0 == (stream->flags & NGHTTP2_STREAM_FLAG_DEFERRED_ALL));
+  assert_int(0, ==, nghttp2_session_on_window_update_received(session, &frame));
+  assert_int(2, ==, user_data.frame_recv_cb_called);
+  assert_int32(NGHTTP2_INITIAL_WINDOW_SIZE + 16 * 1024 * 2, ==,
+               stream->remote_window_size);
+  assert_false(stream->flags & NGHTTP2_STREAM_FLAG_DEFERRED_ALL);
 
   nghttp2_frame_window_update_free(&frame.window_update);
 
@@ -4418,9 +4605,9 @@ void test_nghttp2_session_on_window_update_received(void) {
   nghttp2_frame_window_update_init(&frame.window_update, NGHTTP2_FLAG_NONE, 2,
                                    4096);
 
-  CU_ASSERT(!(session->goaway_flags & NGHTTP2_GOAWAY_TERM_ON_SEND));
-  CU_ASSERT(0 == nghttp2_session_on_window_update_received(session, &frame));
-  CU_ASSERT(session->goaway_flags & NGHTTP2_GOAWAY_TERM_ON_SEND);
+  assert_false(session->goaway_flags & NGHTTP2_GOAWAY_TERM_ON_SEND);
+  assert_int(0, ==, nghttp2_session_on_window_update_received(session, &frame));
+  assert_true(session->goaway_flags & NGHTTP2_GOAWAY_TERM_ON_SEND);
 
   nghttp2_frame_window_update_free(&frame.window_update);
 
@@ -4434,10 +4621,11 @@ void test_nghttp2_session_on_window_update_received(void) {
   nghttp2_frame_window_update_init(&frame.window_update, NGHTTP2_FLAG_NONE, 2,
                                    4096);
 
-  CU_ASSERT(0 == nghttp2_session_on_window_update_received(session, &frame));
-  CU_ASSERT(!(session->goaway_flags & NGHTTP2_GOAWAY_TERM_ON_SEND));
+  assert_int(0, ==, nghttp2_session_on_window_update_received(session, &frame));
+  assert_false(session->goaway_flags & NGHTTP2_GOAWAY_TERM_ON_SEND);
 
-  CU_ASSERT(NGHTTP2_INITIAL_WINDOW_SIZE + 4096 == stream->remote_window_size);
+  assert_int32(NGHTTP2_INITIAL_WINDOW_SIZE + 4096, ==,
+               stream->remote_window_size);
 
   nghttp2_frame_window_update_free(&frame.window_update);
 
@@ -4459,13 +4647,13 @@ void test_nghttp2_session_on_data_received(void) {
 
   nghttp2_frame_hd_init(&frame.hd, 4096, NGHTTP2_DATA, NGHTTP2_FLAG_NONE, 2);
 
-  CU_ASSERT(0 == nghttp2_session_on_data_received(session, &frame));
-  CU_ASSERT(0 == stream->shut_flags);
+  assert_int(0, ==, nghttp2_session_on_data_received(session, &frame));
+  assert_uint8(0, ==, stream->shut_flags);
 
   frame.hd.flags = NGHTTP2_FLAG_END_STREAM;
 
-  CU_ASSERT(0 == nghttp2_session_on_data_received(session, &frame));
-  CU_ASSERT(NGHTTP2_SHUT_RD == stream->shut_flags);
+  assert_int(0, ==, nghttp2_session_on_data_received(session, &frame));
+  assert_uint8(NGHTTP2_SHUT_RD, ==, stream->shut_flags);
 
   /* If NGHTTP2_STREAM_CLOSING state, DATA frame is discarded. */
   open_sent_stream2(session, 1, NGHTTP2_STREAM_CLOSING);
@@ -4473,18 +4661,18 @@ void test_nghttp2_session_on_data_received(void) {
   frame.hd.flags = NGHTTP2_FLAG_NONE;
   frame.hd.stream_id = 1;
 
-  CU_ASSERT(0 == nghttp2_session_on_data_received(session, &frame));
-  CU_ASSERT(NULL == nghttp2_outbound_queue_top(&session->ob_reg));
+  assert_int(0, ==, nghttp2_session_on_data_received(session, &frame));
+  assert_null(nghttp2_outbound_queue_top(&session->ob_reg));
 
   /* Check INVALID_STREAM case: DATA frame with stream ID which does
      not exist. */
 
   frame.hd.stream_id = 3;
 
-  CU_ASSERT(0 == nghttp2_session_on_data_received(session, &frame));
+  assert_int(0, ==, nghttp2_session_on_data_received(session, &frame));
   top = nghttp2_outbound_queue_top(&session->ob_reg);
   /* DATA against nonexistent stream is just ignored for now. */
-  CU_ASSERT(top == NULL);
+  assert_null(top);
 
   nghttp2_session_del(session);
 }
@@ -4508,13 +4696,13 @@ void test_nghttp2_session_on_data_received_fail_fast(void) {
   stream = open_recv_stream(session, 1);
   nghttp2_stream_shutdown(stream, NGHTTP2_SHUT_RD);
 
-  CU_ASSERT((ssize_t)sizeof(buf) ==
-            nghttp2_session_mem_recv(session, buf, sizeof(buf)));
+  assert_ptrdiff((nghttp2_ssize)sizeof(buf), ==,
+                 nghttp2_session_mem_recv2(session, buf, sizeof(buf)));
 
   item = nghttp2_session_get_next_ob_item(session);
 
-  CU_ASSERT(NULL != item);
-  CU_ASSERT(NGHTTP2_GOAWAY == item->frame.hd.type);
+  assert_not_null(item);
+  assert_uint8(NGHTTP2_GOAWAY, ==, item->frame.hd.type);
 
   nghttp2_session_del(session);
 
@@ -4525,13 +4713,13 @@ void test_nghttp2_session_on_data_received_fail_fast(void) {
   nghttp2_stream_shutdown(stream, NGHTTP2_SHUT_RD);
   nghttp2_session_close_stream(session, 1, NGHTTP2_NO_ERROR);
 
-  CU_ASSERT((ssize_t)sizeof(buf) ==
-            nghttp2_session_mem_recv(session, buf, sizeof(buf)));
+  assert_ptrdiff((nghttp2_ssize)sizeof(buf), ==,
+                 nghttp2_session_mem_recv2(session, buf, sizeof(buf)));
 
   item = nghttp2_session_get_next_ob_item(session);
 
-  CU_ASSERT(NULL != item);
-  CU_ASSERT(NGHTTP2_GOAWAY == item->frame.hd.type);
+  assert_not_null(item);
+  assert_uint8(NGHTTP2_GOAWAY, ==, item->frame.hd.type);
 
   nghttp2_session_del(session);
 }
@@ -4564,8 +4752,8 @@ void test_nghttp2_session_on_altsvc_received(void) {
   ud.frame_recv_cb_called = 0;
   rv = nghttp2_session_on_altsvc_received(session, &frame);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(1 == ud.frame_recv_cb_called);
+  assert_int(0, ==, rv);
+  assert_int(1, ==, ud.frame_recv_cb_called);
 
   nghttp2_session_del(session);
 
@@ -4580,8 +4768,8 @@ void test_nghttp2_session_on_altsvc_received(void) {
   ud.frame_recv_cb_called = 0;
   rv = nghttp2_session_on_altsvc_received(session, &frame);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(0 == ud.frame_recv_cb_called);
+  assert_int(0, ==, rv);
+  assert_int(0, ==, ud.frame_recv_cb_called);
 
   nghttp2_session_del(session);
 
@@ -4598,8 +4786,8 @@ void test_nghttp2_session_on_altsvc_received(void) {
   ud.frame_recv_cb_called = 0;
   rv = nghttp2_session_on_altsvc_received(session, &frame);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(0 == ud.frame_recv_cb_called);
+  assert_int(0, ==, rv);
+  assert_int(0, ==, ud.frame_recv_cb_called);
 
   nghttp2_session_del(session);
 
@@ -4616,8 +4804,8 @@ void test_nghttp2_session_on_altsvc_received(void) {
   ud.frame_recv_cb_called = 0;
   rv = nghttp2_session_on_altsvc_received(session, &frame);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(1 == ud.frame_recv_cb_called);
+  assert_int(0, ==, rv);
+  assert_int(1, ==, ud.frame_recv_cb_called);
 
   nghttp2_session_del(session);
 
@@ -4632,8 +4820,8 @@ void test_nghttp2_session_on_altsvc_received(void) {
   ud.frame_recv_cb_called = 0;
   rv = nghttp2_session_on_altsvc_received(session, &frame);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(0 == ud.frame_recv_cb_called);
+  assert_int(0, ==, rv);
+  assert_int(0, ==, ud.frame_recv_cb_called);
 
   nghttp2_session_del(session);
 
@@ -4651,7 +4839,7 @@ void test_nghttp2_session_send_headers_start_stream(void) {
   mem = nghttp2_mem_default();
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   nghttp2_session_client_new(&session, &callbacks, NULL);
 
@@ -4667,9 +4855,9 @@ void test_nghttp2_session_send_headers_start_stream(void) {
   session->next_stream_id += 2;
 
   nghttp2_session_add_item(session, item);
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
   stream = nghttp2_session_get_stream(session, 1);
-  CU_ASSERT(NGHTTP2_STREAM_OPENING == stream->state);
+  assert_enum(nghttp2_stream_state, NGHTTP2_STREAM_OPENING, ==, stream->state);
 
   nghttp2_session_del(session);
 }
@@ -4685,9 +4873,9 @@ void test_nghttp2_session_send_headers_reply(void) {
   mem = nghttp2_mem_default();
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
-  CU_ASSERT(0 == nghttp2_session_server_new(&session, &callbacks, NULL));
+  assert_int(0, ==, nghttp2_session_server_new(&session, &callbacks, NULL));
   open_recv_stream2(session, 1, NGHTTP2_STREAM_OPENING);
 
   item = mem->malloc(sizeof(nghttp2_outbound_item), NULL);
@@ -4699,9 +4887,9 @@ void test_nghttp2_session_send_headers_reply(void) {
   nghttp2_frame_headers_init(&frame->headers, NGHTTP2_FLAG_END_HEADERS, 1,
                              NGHTTP2_HCAT_HEADERS, NULL, NULL, 0);
   nghttp2_session_add_item(session, item);
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
   stream = nghttp2_session_get_stream(session, 1);
-  CU_ASSERT(NGHTTP2_STREAM_OPENED == stream->state);
+  assert_enum(nghttp2_stream_state, NGHTTP2_STREAM_OPENED, ==, stream->state);
 
   nghttp2_session_del(session);
 }
@@ -4733,7 +4921,7 @@ void test_nghttp2_session_send_headers_frame_size_error(void) {
   }
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
   callbacks.on_frame_not_send_callback = on_frame_not_send_callback;
 
   nghttp2_session_client_new(&session, &callbacks, &ud);
@@ -4756,11 +4944,11 @@ void test_nghttp2_session_send_headers_frame_size_error(void) {
 
   ud.frame_not_send_cb_called = 0;
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
 
-  CU_ASSERT(1 == ud.frame_not_send_cb_called);
-  CU_ASSERT(NGHTTP2_HEADERS == ud.not_sent_frame_type);
-  CU_ASSERT(NGHTTP2_ERR_FRAME_SIZE_ERROR == ud.not_sent_error);
+  assert_int(1, ==, ud.frame_not_send_cb_called);
+  assert_uint8(NGHTTP2_HEADERS, ==, ud.not_sent_frame_type);
+  assert_int(NGHTTP2_ERR_FRAME_SIZE_ERROR, ==, ud.not_sent_error);
 
   for (i = 0; i < nnv; ++i) {
     mem->free(nv[i].value, NULL);
@@ -4779,9 +4967,9 @@ void test_nghttp2_session_send_headers_push_reply(void) {
   mem = nghttp2_mem_default();
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
-  CU_ASSERT(0 == nghttp2_session_server_new(&session, &callbacks, NULL));
+  assert_int(0, ==, nghttp2_session_server_new(&session, &callbacks, NULL));
   open_sent_stream2(session, 2, NGHTTP2_STREAM_RESERVED);
 
   item = mem->malloc(sizeof(nghttp2_outbound_item), NULL);
@@ -4793,12 +4981,12 @@ void test_nghttp2_session_send_headers_push_reply(void) {
   nghttp2_frame_headers_init(&frame->headers, NGHTTP2_FLAG_END_HEADERS, 2,
                              NGHTTP2_HCAT_HEADERS, NULL, NULL, 0);
   nghttp2_session_add_item(session, item);
-  CU_ASSERT(0 == session->num_outgoing_streams);
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(1 == session->num_outgoing_streams);
+  assert_size(0, ==, session->num_outgoing_streams);
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_size(1, ==, session->num_outgoing_streams);
   stream = nghttp2_session_get_stream(session, 2);
-  CU_ASSERT(NGHTTP2_STREAM_OPENED == stream->state);
-  CU_ASSERT(0 == (stream->flags & NGHTTP2_STREAM_FLAG_PUSH));
+  assert_enum(nghttp2_stream_state, NGHTTP2_STREAM_OPENED, ==, stream->state);
+  assert_false(stream->flags & NGHTTP2_STREAM_FLAG_PUSH);
   nghttp2_session_del(session);
 }
 
@@ -4813,7 +5001,7 @@ void test_nghttp2_session_send_rst_stream(void) {
   mem = nghttp2_mem_default();
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
   nghttp2_session_client_new(&session, &callbacks, &user_data);
   open_sent_stream(session, 1);
 
@@ -4825,9 +5013,9 @@ void test_nghttp2_session_send_rst_stream(void) {
 
   nghttp2_frame_rst_stream_init(&frame->rst_stream, 1, NGHTTP2_PROTOCOL_ERROR);
   nghttp2_session_add_item(session, item);
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
 
-  CU_ASSERT(NULL == nghttp2_session_get_stream(session, 1));
+  assert_null(nghttp2_session_get_stream(session, 1));
 
   nghttp2_session_del(session);
 }
@@ -4844,7 +5032,7 @@ void test_nghttp2_session_send_push_promise(void) {
 
   mem = nghttp2_mem_default();
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
   callbacks.on_frame_not_send_callback = on_frame_not_send_callback;
 
   nghttp2_session_server_new(&session, &callbacks, &ud);
@@ -4864,9 +5052,9 @@ void test_nghttp2_session_send_push_promise(void) {
 
   nghttp2_session_add_item(session, item);
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
   stream = nghttp2_session_get_stream(session, 2);
-  CU_ASSERT(NGHTTP2_STREAM_RESERVED == stream->state);
+  assert_enum(nghttp2_stream_state, NGHTTP2_STREAM_RESERVED, ==, stream->state);
 
   /* Received ENABLE_PUSH = 0 */
   iv.settings_id = NGHTTP2_SETTINGS_ENABLE_PUSH;
@@ -4889,11 +5077,11 @@ void test_nghttp2_session_send_push_promise(void) {
   nghttp2_session_add_item(session, item);
 
   ud.frame_not_send_cb_called = 0;
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
 
-  CU_ASSERT(1 == ud.frame_not_send_cb_called);
-  CU_ASSERT(NGHTTP2_PUSH_PROMISE == ud.not_sent_frame_type);
-  CU_ASSERT(NGHTTP2_ERR_PUSH_DISABLED == ud.not_sent_error);
+  assert_int(1, ==, ud.frame_not_send_cb_called);
+  assert_uint8(NGHTTP2_PUSH_PROMISE, ==, ud.not_sent_frame_type);
+  assert_int(NGHTTP2_ERR_PUSH_DISABLED, ==, ud.not_sent_error);
 
   nghttp2_session_del(session);
 
@@ -4910,8 +5098,8 @@ void test_nghttp2_session_send_push_promise(void) {
                                   NGHTTP2_FLAG_END_HEADERS, 1, -1, NULL, 0);
   nghttp2_session_add_item(session, item);
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(NULL == nghttp2_session_get_stream(session, 3));
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_null(nghttp2_session_get_stream(session, 3));
 
   nghttp2_session_del(session);
 }
@@ -4922,17 +5110,17 @@ void test_nghttp2_session_is_my_stream_id(void) {
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
   nghttp2_session_server_new(&session, &callbacks, NULL);
 
-  CU_ASSERT(0 == nghttp2_session_is_my_stream_id(session, 0));
-  CU_ASSERT(0 == nghttp2_session_is_my_stream_id(session, 1));
-  CU_ASSERT(1 == nghttp2_session_is_my_stream_id(session, 2));
+  assert_false(nghttp2_session_is_my_stream_id(session, 0));
+  assert_false(nghttp2_session_is_my_stream_id(session, 1));
+  assert_true(nghttp2_session_is_my_stream_id(session, 2));
 
   nghttp2_session_del(session);
 
   nghttp2_session_client_new(&session, &callbacks, NULL);
 
-  CU_ASSERT(0 == nghttp2_session_is_my_stream_id(session, 0));
-  CU_ASSERT(1 == nghttp2_session_is_my_stream_id(session, 1));
-  CU_ASSERT(0 == nghttp2_session_is_my_stream_id(session, 2));
+  assert_false(nghttp2_session_is_my_stream_id(session, 0));
+  assert_true(nghttp2_session_is_my_stream_id(session, 1));
+  assert_false(nghttp2_session_is_my_stream_id(session, 2));
 
   nghttp2_session_del(session);
 }
@@ -4945,7 +5133,7 @@ void test_nghttp2_session_upgrade2(void) {
   nghttp2_settings_entry iv[16];
   nghttp2_stream *stream;
   nghttp2_outbound_item *item;
-  ssize_t rv;
+  nghttp2_ssize rv;
   nghttp2_bufs bufs;
   nghttp2_buf *buf;
   nghttp2_hd_deflater deflater;
@@ -4955,61 +5143,63 @@ void test_nghttp2_session_upgrade2(void) {
   frame_pack_bufs_init(&bufs);
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
   iv[0].settings_id = NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS;
   iv[0].value = 1;
   iv[1].settings_id = NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE;
   iv[1].value = 4095;
-  settings_payloadlen = (size_t)nghttp2_pack_settings_payload(
+  settings_payloadlen = (size_t)nghttp2_pack_settings_payload2(
       settings_payload, sizeof(settings_payload), iv, 2);
 
   /* Check client side */
   nghttp2_session_client_new(&session, &callbacks, NULL);
-  CU_ASSERT(0 == nghttp2_session_upgrade2(session, settings_payload,
-                                          settings_payloadlen, 0, &callbacks));
-  CU_ASSERT(1 == session->last_sent_stream_id);
+  assert_int(0, ==,
+             nghttp2_session_upgrade2(session, settings_payload,
+                                      settings_payloadlen, 0, &callbacks));
+  assert_int32(1, ==, session->last_sent_stream_id);
   stream = nghttp2_session_get_stream(session, 1);
-  CU_ASSERT(stream != NULL);
-  CU_ASSERT(&callbacks == stream->stream_user_data);
-  CU_ASSERT(NGHTTP2_SHUT_WR == stream->shut_flags);
+  assert_not_null(stream);
+  assert_ptr_equal(&callbacks, stream->stream_user_data);
+  assert_uint8(NGHTTP2_SHUT_WR, ==, stream->shut_flags);
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(NGHTTP2_SETTINGS == item->frame.hd.type);
-  CU_ASSERT(2 == item->frame.settings.niv);
-  CU_ASSERT(NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS ==
-            item->frame.settings.iv[0].settings_id);
-  CU_ASSERT(1 == item->frame.settings.iv[0].value);
-  CU_ASSERT(NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE ==
-            item->frame.settings.iv[1].settings_id);
-  CU_ASSERT(4095 == item->frame.settings.iv[1].value);
+  assert_uint8(NGHTTP2_SETTINGS, ==, item->frame.hd.type);
+  assert_size(2, ==, item->frame.settings.niv);
+  assert_int32(NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS, ==,
+               item->frame.settings.iv[0].settings_id);
+  assert_uint32(1, ==, item->frame.settings.iv[0].value);
+  assert_int32(NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE, ==,
+               item->frame.settings.iv[1].settings_id);
+  assert_uint32(4095, ==, item->frame.settings.iv[1].value);
 
   /* Call nghttp2_session_upgrade2() again is error */
-  CU_ASSERT(NGHTTP2_ERR_PROTO ==
-            nghttp2_session_upgrade2(session, settings_payload,
-                                     settings_payloadlen, 0, &callbacks));
+  assert_int(NGHTTP2_ERR_PROTO, ==,
+             nghttp2_session_upgrade2(session, settings_payload,
+                                      settings_payloadlen, 0, &callbacks));
   nghttp2_session_del(session);
 
   /* Make sure that response from server can be received */
   nghttp2_session_client_new(&session, &callbacks, NULL);
 
-  CU_ASSERT(0 == nghttp2_session_upgrade2(session, settings_payload,
-                                          settings_payloadlen, 0, &callbacks));
+  assert_int(0, ==,
+             nghttp2_session_upgrade2(session, settings_payload,
+                                      settings_payloadlen, 0, &callbacks));
 
   stream = nghttp2_session_get_stream(session, 1);
 
-  CU_ASSERT(NGHTTP2_STREAM_OPENING == stream->state);
+  assert_enum(nghttp2_stream_state, NGHTTP2_STREAM_OPENING, ==, stream->state);
 
   nghttp2_hd_deflate_init(&deflater, mem);
   rv = pack_headers(&bufs, &deflater, 1, NGHTTP2_FLAG_END_HEADERS, resnv,
                     ARRLEN(resnv), mem);
 
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   buf = &bufs.head->buf;
 
-  rv = nghttp2_session_mem_recv(session, buf->pos, nghttp2_buf_len(buf));
+  rv = nghttp2_session_mem_recv2(session, buf->pos, nghttp2_buf_len(buf));
 
-  CU_ASSERT(rv == (ssize_t)nghttp2_buf_len(buf));
-  CU_ASSERT(NGHTTP2_STREAM_OPENED == stream->state);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(buf), ==, rv);
+  assert_enum(nghttp2_stream_state, NGHTTP2_STREAM_OPENED, ==, stream->state);
 
   nghttp2_hd_deflate_free(&deflater);
   nghttp2_session_del(session);
@@ -5018,29 +5208,31 @@ void test_nghttp2_session_upgrade2(void) {
 
   /* Check server side */
   nghttp2_session_server_new(&session, &callbacks, NULL);
-  CU_ASSERT(0 == nghttp2_session_upgrade2(session, settings_payload,
-                                          settings_payloadlen, 0, &callbacks));
-  CU_ASSERT(1 == session->last_recv_stream_id);
+  assert_int(0, ==,
+             nghttp2_session_upgrade2(session, settings_payload,
+                                      settings_payloadlen, 0, &callbacks));
+  assert_int32(1, ==, session->last_recv_stream_id);
   stream = nghttp2_session_get_stream(session, 1);
-  CU_ASSERT(stream != NULL);
-  CU_ASSERT(NULL == stream->stream_user_data);
-  CU_ASSERT(NGHTTP2_SHUT_RD == stream->shut_flags);
-  CU_ASSERT(NULL == nghttp2_session_get_next_ob_item(session));
-  CU_ASSERT(1 == session->remote_settings.max_concurrent_streams);
-  CU_ASSERT(4095 == session->remote_settings.initial_window_size);
+  assert_not_null(stream);
+  assert_null(stream->stream_user_data);
+  assert_uint8(NGHTTP2_SHUT_RD, ==, stream->shut_flags);
+  assert_null(nghttp2_session_get_next_ob_item(session));
+  assert_uint32(1, ==, session->remote_settings.max_concurrent_streams);
+  assert_uint32(4095, ==, session->remote_settings.initial_window_size);
   /* Call nghttp2_session_upgrade2() again is error */
-  CU_ASSERT(NGHTTP2_ERR_PROTO ==
-            nghttp2_session_upgrade2(session, settings_payload,
-                                     settings_payloadlen, 0, &callbacks));
+  assert_int(NGHTTP2_ERR_PROTO, ==,
+             nghttp2_session_upgrade2(session, settings_payload,
+                                      settings_payloadlen, 0, &callbacks));
   nghttp2_session_del(session);
 
   /* Empty SETTINGS is OK */
-  settings_payloadlen = (size_t)nghttp2_pack_settings_payload(
+  settings_payloadlen = (size_t)nghttp2_pack_settings_payload2(
       settings_payload, sizeof(settings_payload), NULL, 0);
 
   nghttp2_session_client_new(&session, &callbacks, NULL);
-  CU_ASSERT(0 == nghttp2_session_upgrade2(session, settings_payload,
-                                          settings_payloadlen, 0, NULL));
+  assert_int(0, ==,
+             nghttp2_session_upgrade2(session, settings_payload,
+                                      settings_payloadlen, 0, NULL));
   nghttp2_session_del(session);
   nghttp2_bufs_free(&bufs);
 }
@@ -5054,7 +5246,7 @@ void test_nghttp2_session_reprioritize_stream(void) {
   int rv;
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = block_count_send_callback;
+  callbacks.send_callback2 = block_count_send_callback;
 
   nghttp2_session_server_new(&session, &callbacks, NULL);
 
@@ -5064,9 +5256,9 @@ void test_nghttp2_session_reprioritize_stream(void) {
 
   rv = nghttp2_session_reprioritize_stream(session, stream, &pri_spec);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(10 == stream->weight);
-  CU_ASSERT(&session->root == stream->dep_prev);
+  assert_int(0, ==, rv);
+  assert_int32(10, ==, stream->weight);
+  assert_ptr_equal(&session->root, stream->dep_prev);
 
   /* If dependency to idle stream which is not in dependency tree yet */
 
@@ -5074,13 +5266,13 @@ void test_nghttp2_session_reprioritize_stream(void) {
 
   rv = nghttp2_session_reprioritize_stream(session, stream, &pri_spec);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(99 == stream->weight);
-  CU_ASSERT(3 == stream->dep_prev->stream_id);
+  assert_int(0, ==, rv);
+  assert_int32(99, ==, stream->weight);
+  assert_int32(3, ==, stream->dep_prev->stream_id);
 
   dep_stream = nghttp2_session_get_stream_raw(session, 3);
 
-  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT == dep_stream->weight);
+  assert_int32(NGHTTP2_DEFAULT_WEIGHT, ==, dep_stream->weight);
 
   dep_stream = open_recv_stream(session, 3);
 
@@ -5089,19 +5281,19 @@ void test_nghttp2_session_reprioritize_stream(void) {
 
   rv = nghttp2_session_reprioritize_stream(session, stream, &pri_spec);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(128 == stream->weight);
-  CU_ASSERT(dep_stream == stream->dep_prev);
+  assert_int(0, ==, rv);
+  assert_int32(128, ==, stream->weight);
+  assert_ptr_equal(dep_stream, stream->dep_prev);
 
   /* Change weight again to test short-path case */
   pri_spec.weight = 100;
 
   rv = nghttp2_session_reprioritize_stream(session, stream, &pri_spec);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(100 == stream->weight);
-  CU_ASSERT(dep_stream == stream->dep_prev);
-  CU_ASSERT(100 == dep_stream->sum_dep_weight);
+  assert_int(0, ==, rv);
+  assert_int32(100, ==, stream->weight);
+  assert_ptr_equal(dep_stream, stream->dep_prev);
+  assert_int32(100, ==, dep_stream->sum_dep_weight);
 
   /* Test circular dependency; stream 1 is first removed and becomes
      root.  Then stream 3 depends on it. */
@@ -5109,9 +5301,9 @@ void test_nghttp2_session_reprioritize_stream(void) {
 
   rv = nghttp2_session_reprioritize_stream(session, dep_stream, &pri_spec);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(1 == dep_stream->weight);
-  CU_ASSERT(stream == dep_stream->dep_prev);
+  assert_int(0, ==, rv);
+  assert_int32(1, ==, dep_stream->weight);
+  assert_ptr_equal(stream, dep_stream->dep_prev);
 
   /* Making priority to closed stream will result in default
      priority */
@@ -5121,8 +5313,8 @@ void test_nghttp2_session_reprioritize_stream(void) {
 
   rv = nghttp2_session_reprioritize_stream(session, stream, &pri_spec);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT == stream->weight);
+  assert_int(0, ==, rv);
+  assert_int32(NGHTTP2_DEFAULT_WEIGHT, ==, stream->weight);
 
   nghttp2_session_del(session);
 
@@ -5141,20 +5333,20 @@ void test_nghttp2_session_reprioritize_stream(void) {
   stream = nghttp2_session_get_stream(session, 3);
   rv = nghttp2_session_reprioritize_stream(session, stream, &pri_spec);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(7 == stream->dep_prev->stream_id);
+  assert_int(0, ==, rv);
+  assert_int32(7, ==, stream->dep_prev->stream_id);
 
   stream = nghttp2_session_get_stream(session, 7);
 
-  CU_ASSERT(1 == stream->dep_prev->stream_id);
+  assert_int32(1, ==, stream->dep_prev->stream_id);
 
   stream = nghttp2_session_get_stream(session, 9);
 
-  CU_ASSERT(3 == stream->dep_prev->stream_id);
+  assert_int32(3, ==, stream->dep_prev->stream_id);
 
   stream = nghttp2_session_get_stream(session, 5);
 
-  CU_ASSERT(3 == stream->dep_prev->stream_id);
+  assert_int32(3, ==, stream->dep_prev->stream_id);
 
   nghttp2_session_del(session);
 
@@ -5173,20 +5365,20 @@ void test_nghttp2_session_reprioritize_stream(void) {
   stream = nghttp2_session_get_stream(session, 3);
   rv = nghttp2_session_reprioritize_stream(session, stream, &pri_spec);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(7 == stream->dep_prev->stream_id);
+  assert_int(0, ==, rv);
+  assert_int32(7, ==, stream->dep_prev->stream_id);
 
   stream = nghttp2_session_get_stream(session, 7);
 
-  CU_ASSERT(1 == stream->dep_prev->stream_id);
+  assert_int32(1, ==, stream->dep_prev->stream_id);
 
   stream = nghttp2_session_get_stream(session, 9);
 
-  CU_ASSERT(7 == stream->dep_prev->stream_id);
+  assert_int32(7, ==, stream->dep_prev->stream_id);
 
   stream = nghttp2_session_get_stream(session, 5);
 
-  CU_ASSERT(3 == stream->dep_prev->stream_id);
+  assert_int32(3, ==, stream->dep_prev->stream_id);
 
   nghttp2_session_del(session);
 }
@@ -5198,7 +5390,7 @@ void test_nghttp2_session_reprioritize_stream_with_idle_stream_dep(void) {
   nghttp2_priority_spec pri_spec;
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = block_count_send_callback;
+  callbacks.send_callback2 = block_count_send_callback;
 
   nghttp2_session_server_new(&session, &callbacks, NULL);
 
@@ -5212,12 +5404,12 @@ void test_nghttp2_session_reprioritize_stream_with_idle_stream_dep(void) {
 
   /* idle stream is not counteed to max concurrent streams */
 
-  CU_ASSERT(10 == stream->weight);
-  CU_ASSERT(101 == stream->dep_prev->stream_id);
+  assert_int32(10, ==, stream->weight);
+  assert_int32(101, ==, stream->dep_prev->stream_id);
 
   stream = nghttp2_session_get_stream_raw(session, 101);
 
-  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT == stream->weight);
+  assert_int32(NGHTTP2_DEFAULT_WEIGHT, ==, stream->weight);
 
   nghttp2_session_del(session);
 }
@@ -5225,7 +5417,7 @@ void test_nghttp2_session_reprioritize_stream_with_idle_stream_dep(void) {
 void test_nghttp2_submit_data(void) {
   nghttp2_session *session;
   nghttp2_session_callbacks callbacks;
-  nghttp2_data_provider data_prd;
+  nghttp2_data_provider2 data_prd;
   my_user_data ud;
   nghttp2_frame *frame;
   nghttp2_frame_hd hd;
@@ -5234,30 +5426,31 @@ void test_nghttp2_submit_data(void) {
   nghttp2_buf *buf;
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = block_count_send_callback;
+  callbacks.send_callback2 = block_count_send_callback;
 
   data_prd.read_callback = fixed_length_data_source_read_callback;
   ud.data_source_length = NGHTTP2_DATA_PAYLOADLEN * 2;
-  CU_ASSERT(0 == nghttp2_session_client_new(&session, &callbacks, &ud));
+  assert_int(0, ==, nghttp2_session_client_new(&session, &callbacks, &ud));
   aob = &session->aob;
   framebufs = &aob->framebufs;
 
   open_sent_stream(session, 1);
 
-  CU_ASSERT(
-      0 == nghttp2_submit_data(session, NGHTTP2_FLAG_END_STREAM, 1, &data_prd));
+  assert_int(
+      0, ==,
+      nghttp2_submit_data2(session, NGHTTP2_FLAG_END_STREAM, 1, &data_prd));
 
   ud.block_count = 0;
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
   frame = &aob->item->frame;
 
   buf = &framebufs->head->buf;
   nghttp2_frame_unpack_frame_hd(&hd, buf->pos);
 
-  CU_ASSERT(NGHTTP2_FLAG_NONE == hd.flags);
-  CU_ASSERT(NGHTTP2_FLAG_NONE == frame->hd.flags);
+  assert_uint8(NGHTTP2_FLAG_NONE, ==, hd.flags);
+  assert_uint8(NGHTTP2_FLAG_NONE, ==, frame->hd.flags);
   /* aux_data.data.flags has these flags */
-  CU_ASSERT(NGHTTP2_FLAG_END_STREAM == aob->item->aux_data.data.flags);
+  assert_uint8(NGHTTP2_FLAG_END_STREAM, ==, aob->item->aux_data.data.flags);
 
   nghttp2_session_del(session);
 }
@@ -5265,7 +5458,7 @@ void test_nghttp2_submit_data(void) {
 void test_nghttp2_submit_data_read_length_too_large(void) {
   nghttp2_session *session;
   nghttp2_session_callbacks callbacks;
-  nghttp2_data_provider data_prd;
+  nghttp2_data_provider2 data_prd;
   my_user_data ud;
   nghttp2_frame *frame;
   nghttp2_frame_hd hd;
@@ -5275,37 +5468,38 @@ void test_nghttp2_submit_data_read_length_too_large(void) {
   size_t payloadlen;
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = block_count_send_callback;
-  callbacks.read_length_callback = too_large_data_source_length_callback;
+  callbacks.send_callback2 = block_count_send_callback;
+  callbacks.read_length_callback2 = too_large_data_source_length_callback;
 
   data_prd.read_callback = fixed_length_data_source_read_callback;
   ud.data_source_length = NGHTTP2_DATA_PAYLOADLEN * 2;
-  CU_ASSERT(0 == nghttp2_session_client_new(&session, &callbacks, &ud));
+  assert_int(0, ==, nghttp2_session_client_new(&session, &callbacks, &ud));
   aob = &session->aob;
   framebufs = &aob->framebufs;
 
   open_sent_stream(session, 1);
 
-  CU_ASSERT(
-      0 == nghttp2_submit_data(session, NGHTTP2_FLAG_END_STREAM, 1, &data_prd));
+  assert_int(
+      0, ==,
+      nghttp2_submit_data2(session, NGHTTP2_FLAG_END_STREAM, 1, &data_prd));
 
   ud.block_count = 0;
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
   frame = &aob->item->frame;
 
   buf = &framebufs->head->buf;
   nghttp2_frame_unpack_frame_hd(&hd, buf->pos);
 
-  CU_ASSERT(NGHTTP2_FLAG_NONE == hd.flags);
-  CU_ASSERT(NGHTTP2_FLAG_NONE == frame->hd.flags);
-  CU_ASSERT(16384 == hd.length)
+  assert_uint8(NGHTTP2_FLAG_NONE, ==, hd.flags);
+  assert_uint8(NGHTTP2_FLAG_NONE, ==, frame->hd.flags);
+  assert_size(16384, ==, hd.length);
   /* aux_data.data.flags has these flags */
-  CU_ASSERT(NGHTTP2_FLAG_END_STREAM == aob->item->aux_data.data.flags);
+  assert_uint8(NGHTTP2_FLAG_END_STREAM, ==, aob->item->aux_data.data.flags);
 
   nghttp2_session_del(session);
 
   /* Check that buffers are expanded */
-  CU_ASSERT(0 == nghttp2_session_client_new(&session, &callbacks, &ud));
+  assert_int(0, ==, nghttp2_session_client_new(&session, &callbacks, &ud));
 
   ud.data_source_length = NGHTTP2_MAX_FRAME_SIZE_MAX;
 
@@ -5313,11 +5507,12 @@ void test_nghttp2_submit_data_read_length_too_large(void) {
 
   open_sent_stream(session, 1);
 
-  CU_ASSERT(
-      0 == nghttp2_submit_data(session, NGHTTP2_FLAG_END_STREAM, 1, &data_prd));
+  assert_int(
+      0, ==,
+      nghttp2_submit_data2(session, NGHTTP2_FLAG_END_STREAM, 1, &data_prd));
 
   ud.block_count = 0;
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
 
   aob = &session->aob;
 
@@ -5331,13 +5526,13 @@ void test_nghttp2_submit_data_read_length_too_large(void) {
   payloadlen = nghttp2_min(NGHTTP2_INITIAL_CONNECTION_WINDOW_SIZE,
                            NGHTTP2_INITIAL_WINDOW_SIZE);
 
-  CU_ASSERT(NGHTTP2_FRAME_HDLEN + 1 + payloadlen ==
-            (size_t)nghttp2_buf_cap(buf));
-  CU_ASSERT(NGHTTP2_FLAG_NONE == hd.flags);
-  CU_ASSERT(NGHTTP2_FLAG_NONE == frame->hd.flags);
-  CU_ASSERT(payloadlen == hd.length);
+  assert_size(NGHTTP2_FRAME_HDLEN + 1 + payloadlen, ==,
+              (size_t)nghttp2_buf_cap(buf));
+  assert_uint8(NGHTTP2_FLAG_NONE, ==, hd.flags);
+  assert_uint8(NGHTTP2_FLAG_NONE, ==, frame->hd.flags);
+  assert_size(payloadlen, ==, hd.length);
   /* aux_data.data.flags has these flags */
-  CU_ASSERT(NGHTTP2_FLAG_END_STREAM == aob->item->aux_data.data.flags);
+  assert_uint8(NGHTTP2_FLAG_END_STREAM, ==, aob->item->aux_data.data.flags);
 
   nghttp2_session_del(session);
 }
@@ -5345,7 +5540,7 @@ void test_nghttp2_submit_data_read_length_too_large(void) {
 void test_nghttp2_submit_data_read_length_smallest(void) {
   nghttp2_session *session;
   nghttp2_session_callbacks callbacks;
-  nghttp2_data_provider data_prd;
+  nghttp2_data_provider2 data_prd;
   my_user_data ud;
   nghttp2_frame *frame;
   nghttp2_frame_hd hd;
@@ -5354,37 +5549,38 @@ void test_nghttp2_submit_data_read_length_smallest(void) {
   nghttp2_buf *buf;
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = block_count_send_callback;
-  callbacks.read_length_callback = smallest_length_data_source_length_callback;
+  callbacks.send_callback2 = block_count_send_callback;
+  callbacks.read_length_callback2 = smallest_length_data_source_length_callback;
 
   data_prd.read_callback = fixed_length_data_source_read_callback;
   ud.data_source_length = NGHTTP2_DATA_PAYLOADLEN * 2;
-  CU_ASSERT(0 == nghttp2_session_client_new(&session, &callbacks, &ud));
+  assert_int(0, ==, nghttp2_session_client_new(&session, &callbacks, &ud));
   aob = &session->aob;
   framebufs = &aob->framebufs;
 
   open_sent_stream(session, 1);
 
-  CU_ASSERT(
-      0 == nghttp2_submit_data(session, NGHTTP2_FLAG_END_STREAM, 1, &data_prd));
+  assert_int(
+      0, ==,
+      nghttp2_submit_data2(session, NGHTTP2_FLAG_END_STREAM, 1, &data_prd));
 
   ud.block_count = 0;
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
   frame = &aob->item->frame;
 
   buf = &framebufs->head->buf;
   nghttp2_frame_unpack_frame_hd(&hd, buf->pos);
 
-  CU_ASSERT(NGHTTP2_FLAG_NONE == hd.flags);
-  CU_ASSERT(NGHTTP2_FLAG_NONE == frame->hd.flags);
-  CU_ASSERT(1 == hd.length)
+  assert_uint8(NGHTTP2_FLAG_NONE, ==, hd.flags);
+  assert_uint8(NGHTTP2_FLAG_NONE, ==, frame->hd.flags);
+  assert_size(1, ==, hd.length);
   /* aux_data.data.flags has these flags */
-  CU_ASSERT(NGHTTP2_FLAG_END_STREAM == aob->item->aux_data.data.flags);
+  assert_uint8(NGHTTP2_FLAG_END_STREAM, ==, aob->item->aux_data.data.flags);
 
   nghttp2_session_del(session);
 }
 
-static ssize_t submit_data_twice_data_source_read_callback(
+static nghttp2_ssize submit_data_twice_data_source_read_callback(
     nghttp2_session *session, int32_t stream_id, uint8_t *buf, size_t len,
     uint32_t *data_flags, nghttp2_data_source *source, void *user_data) {
   (void)session;
@@ -5394,7 +5590,7 @@ static ssize_t submit_data_twice_data_source_read_callback(
   (void)user_data;
 
   *data_flags |= NGHTTP2_DATA_FLAG_EOF;
-  return (ssize_t)nghttp2_min(len, 16);
+  return (nghttp2_ssize)nghttp2_min(len, 16);
 }
 
 static int submit_data_twice_on_frame_send_callback(nghttp2_session *session,
@@ -5402,7 +5598,7 @@ static int submit_data_twice_on_frame_send_callback(nghttp2_session *session,
                                                     void *user_data) {
   static int called = 0;
   int rv;
-  nghttp2_data_provider data_prd;
+  nghttp2_data_provider2 data_prd;
   (void)user_data;
 
   if (called == 0) {
@@ -5410,9 +5606,9 @@ static int submit_data_twice_on_frame_send_callback(nghttp2_session *session,
 
     data_prd.read_callback = submit_data_twice_data_source_read_callback;
 
-    rv = nghttp2_submit_data(session, NGHTTP2_FLAG_END_STREAM,
-                             frame->hd.stream_id, &data_prd);
-    CU_ASSERT(0 == rv);
+    rv = nghttp2_submit_data2(session, NGHTTP2_FLAG_END_STREAM,
+                              frame->hd.stream_id, &data_prd);
+    assert_int(0, ==, rv);
   }
 
   return 0;
@@ -5421,12 +5617,12 @@ static int submit_data_twice_on_frame_send_callback(nghttp2_session *session,
 void test_nghttp2_submit_data_twice(void) {
   nghttp2_session *session;
   nghttp2_session_callbacks callbacks;
-  nghttp2_data_provider data_prd;
+  nghttp2_data_provider2 data_prd;
   my_user_data ud;
   accumulator acc;
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = accumulator_send_callback;
+  callbacks.send_callback2 = accumulator_send_callback;
   callbacks.on_frame_send_callback = submit_data_twice_on_frame_send_callback;
 
   data_prd.read_callback = submit_data_twice_data_source_read_callback;
@@ -5434,15 +5630,16 @@ void test_nghttp2_submit_data_twice(void) {
   acc.length = 0;
   ud.acc = &acc;
 
-  CU_ASSERT(0 == nghttp2_session_client_new(&session, &callbacks, &ud));
+  assert_int(0, ==, nghttp2_session_client_new(&session, &callbacks, &ud));
 
   open_sent_stream(session, 1);
 
-  CU_ASSERT(0 == nghttp2_submit_data(session, NGHTTP2_FLAG_NONE, 1, &data_prd));
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==,
+             nghttp2_submit_data2(session, NGHTTP2_FLAG_NONE, 1, &data_prd));
+  assert_int(0, ==, nghttp2_session_send(session));
 
   /* We should have sent 2 DATA frame with 16 bytes payload each */
-  CU_ASSERT(NGHTTP2_FRAME_HDLEN * 2 + 16 * 2 == acc.length);
+  assert_size(NGHTTP2_FRAME_HDLEN * 2 + 16 * 2, ==, acc.length);
 
   nghttp2_session_del(session);
 }
@@ -5450,7 +5647,7 @@ void test_nghttp2_submit_data_twice(void) {
 void test_nghttp2_submit_request_with_data(void) {
   nghttp2_session *session;
   nghttp2_session_callbacks callbacks;
-  nghttp2_data_provider data_prd;
+  nghttp2_data_provider2 data_prd;
   my_user_data ud;
   nghttp2_outbound_item *item;
   nghttp2_mem *mem;
@@ -5458,28 +5655,29 @@ void test_nghttp2_submit_request_with_data(void) {
   mem = nghttp2_mem_default();
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   data_prd.read_callback = fixed_length_data_source_read_callback;
   ud.data_source_length = 64 * 1024 - 1;
-  CU_ASSERT(0 == nghttp2_session_client_new(&session, &callbacks, &ud));
-  CU_ASSERT(1 == nghttp2_submit_request(session, NULL, reqnv, ARRLEN(reqnv),
-                                        &data_prd, NULL));
+  assert_int(0, ==, nghttp2_session_client_new(&session, &callbacks, &ud));
+  assert_int32(1, ==,
+               nghttp2_submit_request2(session, NULL, reqnv, ARRLEN(reqnv),
+                                       &data_prd, NULL));
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(ARRLEN(reqnv) == item->frame.headers.nvlen);
+  assert_size(ARRLEN(reqnv), ==, item->frame.headers.nvlen);
   assert_nv_equal(reqnv, item->frame.headers.nva, item->frame.headers.nvlen,
                   mem);
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(0 == ud.data_source_length);
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_size(0, ==, ud.data_source_length);
 
   nghttp2_session_del(session);
 
-  /* nghttp2_submit_request() with server session is error */
+  /* nghttp2_submit_request2() with server session is error */
   nghttp2_session_server_new(&session, &callbacks, NULL);
 
-  CU_ASSERT(NGHTTP2_ERR_PROTO == nghttp2_submit_request(session, NULL, reqnv,
-                                                        ARRLEN(reqnv), NULL,
-                                                        NULL));
+  assert_int32(
+      NGHTTP2_ERR_PROTO, ==,
+      nghttp2_submit_request2(session, NULL, reqnv, ARRLEN(reqnv), NULL, NULL));
 
   nghttp2_session_del(session);
 }
@@ -5488,7 +5686,7 @@ void test_nghttp2_submit_request_without_data(void) {
   nghttp2_session *session;
   nghttp2_session_callbacks callbacks;
   accumulator acc;
-  nghttp2_data_provider data_prd = {{-1}, NULL};
+  nghttp2_data_provider2 data_prd = {{-1}, NULL};
   nghttp2_outbound_item *item;
   my_user_data ud;
   nghttp2_frame frame;
@@ -5505,25 +5703,26 @@ void test_nghttp2_submit_request_without_data(void) {
   acc.length = 0;
   ud.acc = &acc;
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = accumulator_send_callback;
-  CU_ASSERT(0 == nghttp2_session_client_new(&session, &callbacks, &ud));
+  callbacks.send_callback2 = accumulator_send_callback;
+  assert_int(0, ==, nghttp2_session_client_new(&session, &callbacks, &ud));
 
   nghttp2_hd_inflate_init(&inflater, mem);
-  CU_ASSERT(1 == nghttp2_submit_request(session, NULL, reqnv, ARRLEN(reqnv),
-                                        &data_prd, NULL));
+  assert_int32(1, ==,
+               nghttp2_submit_request2(session, NULL, reqnv, ARRLEN(reqnv),
+                                       &data_prd, NULL));
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(ARRLEN(reqnv) == item->frame.headers.nvlen);
+  assert_size(ARRLEN(reqnv), ==, item->frame.headers.nvlen);
   assert_nv_equal(reqnv, item->frame.headers.nva, item->frame.headers.nvlen,
                   mem);
-  CU_ASSERT(item->frame.hd.flags & NGHTTP2_FLAG_END_STREAM);
+  assert_true(item->frame.hd.flags & NGHTTP2_FLAG_END_STREAM);
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(0 == unpack_frame(&frame, acc.buf, acc.length));
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_int(0, ==, unpack_frame(&frame, acc.buf, acc.length));
 
   nghttp2_bufs_add(&bufs, acc.buf, acc.length);
   inflate_hd(&inflater, &out, &bufs, NGHTTP2_FRAME_HDLEN, mem);
 
-  CU_ASSERT(ARRLEN(reqnv) == out.nvlen);
+  assert_size(ARRLEN(reqnv), ==, out.nvlen);
   assert_nv_equal(reqnv, out.nva, out.nvlen, mem);
   nghttp2_frame_headers_free(&frame.headers, mem);
   nva_out_reset(&out, mem);
@@ -5535,9 +5734,9 @@ void test_nghttp2_submit_request_without_data(void) {
   nghttp2_priority_spec_init(&pri_spec, (int32_t)session->next_stream_id, 16,
                              0);
 
-  CU_ASSERT(NGHTTP2_ERR_INVALID_ARGUMENT ==
-            nghttp2_submit_request(session, &pri_spec, reqnv, ARRLEN(reqnv),
-                                   NULL, NULL));
+  assert_int32(NGHTTP2_ERR_INVALID_ARGUMENT, ==,
+               nghttp2_submit_request2(session, &pri_spec, reqnv, ARRLEN(reqnv),
+                                       NULL, NULL));
 
   nghttp2_session_del(session);
 }
@@ -5545,7 +5744,7 @@ void test_nghttp2_submit_request_without_data(void) {
 void test_nghttp2_submit_response_with_data(void) {
   nghttp2_session *session;
   nghttp2_session_callbacks callbacks;
-  nghttp2_data_provider data_prd;
+  nghttp2_data_provider2 data_prd;
   my_user_data ud;
   nghttp2_outbound_item *item;
   nghttp2_mem *mem;
@@ -5553,33 +5752,34 @@ void test_nghttp2_submit_response_with_data(void) {
   mem = nghttp2_mem_default();
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   data_prd.read_callback = fixed_length_data_source_read_callback;
   ud.data_source_length = 64 * 1024 - 1;
-  CU_ASSERT(0 == nghttp2_session_server_new(&session, &callbacks, &ud));
+  assert_int(0, ==, nghttp2_session_server_new(&session, &callbacks, &ud));
   open_recv_stream2(session, 1, NGHTTP2_STREAM_OPENING);
-  CU_ASSERT(0 == nghttp2_submit_response(session, 1, resnv, ARRLEN(resnv),
-                                         &data_prd));
+  assert_int(
+      0, ==,
+      nghttp2_submit_response2(session, 1, resnv, ARRLEN(resnv), &data_prd));
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(ARRLEN(resnv) == item->frame.headers.nvlen);
+  assert_size(ARRLEN(resnv), ==, item->frame.headers.nvlen);
   assert_nv_equal(resnv, item->frame.headers.nva, item->frame.headers.nvlen,
                   mem);
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(0 == ud.data_source_length);
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_size(0, ==, ud.data_source_length);
 
   nghttp2_session_del(session);
 
   /* Various error cases */
   nghttp2_session_client_new(&session, &callbacks, NULL);
 
-  /* Calling nghttp2_submit_response() with client session is error */
-  CU_ASSERT(NGHTTP2_ERR_PROTO ==
-            nghttp2_submit_response(session, 1, resnv, ARRLEN(resnv), NULL));
+  /* Calling nghttp2_submit_response2() with client session is error */
+  assert_int(NGHTTP2_ERR_PROTO, ==,
+             nghttp2_submit_response2(session, 1, resnv, ARRLEN(resnv), NULL));
 
   /* Stream ID <= 0 is error */
-  CU_ASSERT(NGHTTP2_ERR_INVALID_ARGUMENT ==
-            nghttp2_submit_response(session, 0, resnv, ARRLEN(resnv), NULL));
+  assert_int(NGHTTP2_ERR_INVALID_ARGUMENT, ==,
+             nghttp2_submit_response2(session, 0, resnv, ARRLEN(resnv), NULL));
 
   nghttp2_session_del(session);
 }
@@ -5588,7 +5788,7 @@ void test_nghttp2_submit_response_without_data(void) {
   nghttp2_session *session;
   nghttp2_session_callbacks callbacks;
   accumulator acc;
-  nghttp2_data_provider data_prd = {{-1}, NULL};
+  nghttp2_data_provider2 data_prd = {{-1}, NULL};
   nghttp2_outbound_item *item;
   my_user_data ud;
   nghttp2_frame frame;
@@ -5604,26 +5804,27 @@ void test_nghttp2_submit_response_without_data(void) {
   acc.length = 0;
   ud.acc = &acc;
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = accumulator_send_callback;
-  CU_ASSERT(0 == nghttp2_session_server_new(&session, &callbacks, &ud));
+  callbacks.send_callback2 = accumulator_send_callback;
+  assert_int(0, ==, nghttp2_session_server_new(&session, &callbacks, &ud));
 
   nghttp2_hd_inflate_init(&inflater, mem);
   open_recv_stream2(session, 1, NGHTTP2_STREAM_OPENING);
-  CU_ASSERT(0 == nghttp2_submit_response(session, 1, resnv, ARRLEN(resnv),
-                                         &data_prd));
+  assert_int(
+      0, ==,
+      nghttp2_submit_response2(session, 1, resnv, ARRLEN(resnv), &data_prd));
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(ARRLEN(resnv) == item->frame.headers.nvlen);
+  assert_size(ARRLEN(resnv), ==, item->frame.headers.nvlen);
   assert_nv_equal(resnv, item->frame.headers.nva, item->frame.headers.nvlen,
                   mem);
-  CU_ASSERT(item->frame.hd.flags & NGHTTP2_FLAG_END_STREAM);
+  assert_true(item->frame.hd.flags & NGHTTP2_FLAG_END_STREAM);
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(0 == unpack_frame(&frame, acc.buf, acc.length));
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_int(0, ==, unpack_frame(&frame, acc.buf, acc.length));
 
   nghttp2_bufs_add(&bufs, acc.buf, acc.length);
   inflate_hd(&inflater, &out, &bufs, NGHTTP2_FRAME_HDLEN, mem);
 
-  CU_ASSERT(ARRLEN(resnv) == out.nvlen);
+  assert_size(ARRLEN(resnv), ==, out.nvlen);
   assert_nv_equal(resnv, out.nva, out.nvlen, mem);
 
   nva_out_reset(&out, mem);
@@ -5639,7 +5840,7 @@ void test_nghttp2_submit_response_push_response(void) {
   my_user_data ud;
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
   callbacks.on_frame_not_send_callback = on_frame_not_send_callback;
 
   nghttp2_session_server_new(&session, &callbacks, &ud);
@@ -5648,13 +5849,13 @@ void test_nghttp2_submit_response_push_response(void) {
 
   session->goaway_flags |= NGHTTP2_GOAWAY_RECV;
 
-  CU_ASSERT(0 ==
-            nghttp2_submit_response(session, 2, resnv, ARRLEN(resnv), NULL));
+  assert_int(0, ==,
+             nghttp2_submit_response2(session, 2, resnv, ARRLEN(resnv), NULL));
 
   ud.frame_not_send_cb_called = 0;
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(1 == ud.frame_not_send_cb_called);
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_int(1, ==, ud.frame_not_send_cb_called);
 
   nghttp2_session_del(session);
 }
@@ -5663,7 +5864,7 @@ void test_nghttp2_submit_trailer(void) {
   nghttp2_session *session;
   nghttp2_session_callbacks callbacks;
   accumulator acc;
-  nghttp2_data_provider data_prd;
+  nghttp2_data_provider2 data_prd;
   nghttp2_outbound_item *item;
   my_user_data ud;
   nghttp2_frame frame;
@@ -5680,32 +5881,34 @@ void test_nghttp2_submit_trailer(void) {
   acc.length = 0;
   ud.acc = &acc;
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
-  CU_ASSERT(0 == nghttp2_session_server_new(&session, &callbacks, &ud));
+  callbacks.send_callback2 = null_send_callback;
+  assert_int(0, ==, nghttp2_session_server_new(&session, &callbacks, &ud));
 
   nghttp2_hd_inflate_init(&inflater, mem);
   open_recv_stream2(session, 1, NGHTTP2_STREAM_OPENING);
-  CU_ASSERT(0 == nghttp2_submit_response(session, 1, resnv, ARRLEN(resnv),
-                                         &data_prd));
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(
+      0, ==,
+      nghttp2_submit_response2(session, 1, resnv, ARRLEN(resnv), &data_prd));
+  assert_int(0, ==, nghttp2_session_send(session));
 
-  CU_ASSERT(0 ==
-            nghttp2_submit_trailer(session, 1, trailernv, ARRLEN(trailernv)));
+  assert_int(0, ==,
+             nghttp2_submit_trailer(session, 1, trailernv, ARRLEN(trailernv)));
 
-  session->callbacks.send_callback = accumulator_send_callback;
+  session->callbacks.send_callback2 = accumulator_send_callback;
 
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(NGHTTP2_HEADERS == item->frame.hd.type);
-  CU_ASSERT(NGHTTP2_HCAT_HEADERS == item->frame.headers.cat);
-  CU_ASSERT(item->frame.hd.flags & NGHTTP2_FLAG_END_STREAM);
+  assert_uint8(NGHTTP2_HEADERS, ==, item->frame.hd.type);
+  assert_enum(nghttp2_headers_category, NGHTTP2_HCAT_HEADERS, ==,
+              item->frame.headers.cat);
+  assert_true(item->frame.hd.flags & NGHTTP2_FLAG_END_STREAM);
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(0 == unpack_frame(&frame, acc.buf, acc.length));
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_int(0, ==, unpack_frame(&frame, acc.buf, acc.length));
 
   nghttp2_bufs_add(&bufs, acc.buf, acc.length);
   inflate_hd(&inflater, &out, &bufs, NGHTTP2_FRAME_HDLEN, mem);
 
-  CU_ASSERT(ARRLEN(trailernv) == out.nvlen);
+  assert_size(ARRLEN(trailernv), ==, out.nvlen);
   assert_nv_equal(trailernv, out.nva, out.nvlen, mem);
 
   nva_out_reset(&out, mem);
@@ -5718,11 +5921,11 @@ void test_nghttp2_submit_trailer(void) {
   nghttp2_session_server_new(&session, &callbacks, NULL);
   open_recv_stream(session, 1);
 
-  CU_ASSERT(NGHTTP2_ERR_INVALID_ARGUMENT ==
-            nghttp2_submit_trailer(session, 0, trailernv, ARRLEN(trailernv)));
+  assert_int(NGHTTP2_ERR_INVALID_ARGUMENT, ==,
+             nghttp2_submit_trailer(session, 0, trailernv, ARRLEN(trailernv)));
 
-  CU_ASSERT(NGHTTP2_ERR_INVALID_ARGUMENT ==
-            nghttp2_submit_trailer(session, -1, trailernv, ARRLEN(trailernv)));
+  assert_int(NGHTTP2_ERR_INVALID_ARGUMENT, ==,
+             nghttp2_submit_trailer(session, -1, trailernv, ARRLEN(trailernv)));
 
   nghttp2_session_del(session);
 }
@@ -5736,16 +5939,17 @@ void test_nghttp2_submit_headers_start_stream(void) {
   mem = nghttp2_mem_default();
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  CU_ASSERT(0 == nghttp2_session_client_new(&session, &callbacks, NULL));
-  CU_ASSERT(1 == nghttp2_submit_headers(session, NGHTTP2_FLAG_END_STREAM, -1,
-                                        NULL, reqnv, ARRLEN(reqnv), NULL));
+  assert_int(0, ==, nghttp2_session_client_new(&session, &callbacks, NULL));
+  assert_int32(1, ==,
+               nghttp2_submit_headers(session, NGHTTP2_FLAG_END_STREAM, -1,
+                                      NULL, reqnv, ARRLEN(reqnv), NULL));
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(ARRLEN(reqnv) == item->frame.headers.nvlen);
+  assert_size(ARRLEN(reqnv), ==, item->frame.headers.nvlen);
   assert_nv_equal(reqnv, item->frame.headers.nva, item->frame.headers.nvlen,
                   mem);
-  CU_ASSERT((NGHTTP2_FLAG_END_HEADERS | NGHTTP2_FLAG_END_STREAM) ==
-            item->frame.hd.flags);
-  CU_ASSERT(0 == (item->frame.hd.flags & NGHTTP2_FLAG_PRIORITY));
+  assert_uint8((NGHTTP2_FLAG_END_HEADERS | NGHTTP2_FLAG_END_STREAM), ==,
+               item->frame.hd.flags);
+  assert_false(item->frame.hd.flags & NGHTTP2_FLAG_PRIORITY);
 
   nghttp2_session_del(session);
 }
@@ -5761,34 +5965,36 @@ void test_nghttp2_submit_headers_reply(void) {
   mem = nghttp2_mem_default();
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
   callbacks.on_frame_send_callback = on_frame_send_callback;
 
-  CU_ASSERT(0 == nghttp2_session_server_new(&session, &callbacks, &ud));
-  CU_ASSERT(0 == nghttp2_submit_headers(session, NGHTTP2_FLAG_END_STREAM, 1,
-                                        NULL, resnv, ARRLEN(resnv), NULL));
+  assert_int(0, ==, nghttp2_session_server_new(&session, &callbacks, &ud));
+  assert_int32(0, ==,
+               nghttp2_submit_headers(session, NGHTTP2_FLAG_END_STREAM, 1, NULL,
+                                      resnv, ARRLEN(resnv), NULL));
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(ARRLEN(resnv) == item->frame.headers.nvlen);
+  assert_size(ARRLEN(resnv), ==, item->frame.headers.nvlen);
   assert_nv_equal(resnv, item->frame.headers.nva, item->frame.headers.nvlen,
                   mem);
-  CU_ASSERT((NGHTTP2_FLAG_END_STREAM | NGHTTP2_FLAG_END_HEADERS) ==
-            item->frame.hd.flags);
+  assert_uint8((NGHTTP2_FLAG_END_STREAM | NGHTTP2_FLAG_END_HEADERS), ==,
+               item->frame.hd.flags);
 
   ud.frame_send_cb_called = 0;
   ud.sent_frame_type = 0;
   /* The transimission will be canceled because the stream 1 is not
      open. */
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(0 == ud.frame_send_cb_called);
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_int(0, ==, ud.frame_send_cb_called);
 
   stream = open_recv_stream2(session, 1, NGHTTP2_STREAM_OPENING);
 
-  CU_ASSERT(0 == nghttp2_submit_headers(session, NGHTTP2_FLAG_END_STREAM, 1,
-                                        NULL, resnv, ARRLEN(resnv), NULL));
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(1 == ud.frame_send_cb_called);
-  CU_ASSERT(NGHTTP2_HEADERS == ud.sent_frame_type);
-  CU_ASSERT(stream->shut_flags & NGHTTP2_SHUT_WR);
+  assert_int32(0, ==,
+               nghttp2_submit_headers(session, NGHTTP2_FLAG_END_STREAM, 1, NULL,
+                                      resnv, ARRLEN(resnv), NULL));
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_int(1, ==, ud.frame_send_cb_called);
+  assert_uint8(NGHTTP2_HEADERS, ==, ud.sent_frame_type);
+  assert_true(stream->shut_flags & NGHTTP2_SHUT_WR);
 
   nghttp2_session_del(session);
 }
@@ -5801,35 +6007,37 @@ void test_nghttp2_submit_headers_push_reply(void) {
   int foo;
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
   callbacks.on_frame_send_callback = on_frame_send_callback;
 
-  CU_ASSERT(0 == nghttp2_session_server_new(&session, &callbacks, &ud));
+  assert_int(0, ==, nghttp2_session_server_new(&session, &callbacks, &ud));
   stream = open_sent_stream2(session, 2, NGHTTP2_STREAM_RESERVED);
-  CU_ASSERT(0 == nghttp2_submit_headers(session, NGHTTP2_FLAG_NONE, 2, NULL,
-                                        resnv, ARRLEN(resnv), &foo));
+  assert_int32(0, ==,
+               nghttp2_submit_headers(session, NGHTTP2_FLAG_NONE, 2, NULL,
+                                      resnv, ARRLEN(resnv), &foo));
 
   ud.frame_send_cb_called = 0;
   ud.sent_frame_type = 0;
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(1 == ud.frame_send_cb_called);
-  CU_ASSERT(NGHTTP2_HEADERS == ud.sent_frame_type);
-  CU_ASSERT(NGHTTP2_STREAM_OPENED == stream->state);
-  CU_ASSERT(&foo == stream->stream_user_data);
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_int(1, ==, ud.frame_send_cb_called);
+  assert_uint8(NGHTTP2_HEADERS, ==, ud.sent_frame_type);
+  assert_enum(nghttp2_stream_state, NGHTTP2_STREAM_OPENED, ==, stream->state);
+  assert_ptr_equal(&foo, stream->stream_user_data);
 
   nghttp2_session_del(session);
 
   /* Sending HEADERS from client against stream in reserved state is
      error */
-  CU_ASSERT(0 == nghttp2_session_client_new(&session, &callbacks, &ud));
+  assert_int(0, ==, nghttp2_session_client_new(&session, &callbacks, &ud));
   open_recv_stream2(session, 2, NGHTTP2_STREAM_RESERVED);
-  CU_ASSERT(0 == nghttp2_submit_headers(session, NGHTTP2_FLAG_NONE, 2, NULL,
-                                        reqnv, ARRLEN(reqnv), NULL));
+  assert_int32(0, ==,
+               nghttp2_submit_headers(session, NGHTTP2_FLAG_NONE, 2, NULL,
+                                      reqnv, ARRLEN(reqnv), NULL));
 
   ud.frame_send_cb_called = 0;
   ud.sent_frame_type = 0;
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(0 == ud.frame_send_cb_called);
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_int(0, ==, ud.frame_send_cb_called);
 
   nghttp2_session_del(session);
 }
@@ -5855,43 +6063,45 @@ void test_nghttp2_submit_headers(void) {
   acc.length = 0;
   ud.acc = &acc;
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = accumulator_send_callback;
+  callbacks.send_callback2 = accumulator_send_callback;
   callbacks.on_frame_send_callback = on_frame_send_callback;
 
-  CU_ASSERT(0 == nghttp2_session_client_new(&session, &callbacks, &ud));
+  assert_int(0, ==, nghttp2_session_client_new(&session, &callbacks, &ud));
 
   nghttp2_hd_inflate_init(&inflater, mem);
-  CU_ASSERT(0 == nghttp2_submit_headers(session, NGHTTP2_FLAG_END_STREAM, 1,
-                                        NULL, reqnv, ARRLEN(reqnv), NULL));
+  assert_int32(0, ==,
+               nghttp2_submit_headers(session, NGHTTP2_FLAG_END_STREAM, 1, NULL,
+                                      reqnv, ARRLEN(reqnv), NULL));
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(ARRLEN(reqnv) == item->frame.headers.nvlen);
+  assert_size(ARRLEN(reqnv), ==, item->frame.headers.nvlen);
   assert_nv_equal(reqnv, item->frame.headers.nva, item->frame.headers.nvlen,
                   mem);
-  CU_ASSERT((NGHTTP2_FLAG_END_STREAM | NGHTTP2_FLAG_END_HEADERS) ==
-            item->frame.hd.flags);
+  assert_uint8((NGHTTP2_FLAG_END_STREAM | NGHTTP2_FLAG_END_HEADERS), ==,
+               item->frame.hd.flags);
 
   ud.frame_send_cb_called = 0;
   ud.sent_frame_type = 0;
   /* The transimission will be canceled because the stream 1 is not
      open. */
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(0 == ud.frame_send_cb_called);
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_int(0, ==, ud.frame_send_cb_called);
 
   stream = open_sent_stream(session, 1);
 
-  CU_ASSERT(0 == nghttp2_submit_headers(session, NGHTTP2_FLAG_END_STREAM, 1,
-                                        NULL, reqnv, ARRLEN(reqnv), NULL));
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(1 == ud.frame_send_cb_called);
-  CU_ASSERT(NGHTTP2_HEADERS == ud.sent_frame_type);
-  CU_ASSERT(stream->shut_flags & NGHTTP2_SHUT_WR);
+  assert_int32(0, ==,
+               nghttp2_submit_headers(session, NGHTTP2_FLAG_END_STREAM, 1, NULL,
+                                      reqnv, ARRLEN(reqnv), NULL));
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_int(1, ==, ud.frame_send_cb_called);
+  assert_uint8(NGHTTP2_HEADERS, ==, ud.sent_frame_type);
+  assert_true(stream->shut_flags & NGHTTP2_SHUT_WR);
 
-  CU_ASSERT(0 == unpack_frame(&frame, acc.buf, acc.length));
+  assert_int(0, ==, unpack_frame(&frame, acc.buf, acc.length));
 
   nghttp2_bufs_add(&bufs, acc.buf, acc.length);
   inflate_hd(&inflater, &out, &bufs, NGHTTP2_FRAME_HDLEN, mem);
 
-  CU_ASSERT(ARRLEN(reqnv) == out.nvlen);
+  assert_size(ARRLEN(reqnv), ==, out.nvlen);
   assert_nv_equal(reqnv, out.nva, out.nvlen, mem);
 
   nva_out_reset(&out, mem);
@@ -5903,16 +6113,16 @@ void test_nghttp2_submit_headers(void) {
   /* Try to depend on itself */
   nghttp2_priority_spec_init(&pri_spec, 3, 16, 0);
 
-  CU_ASSERT(NGHTTP2_ERR_INVALID_ARGUMENT ==
-            nghttp2_submit_headers(session, NGHTTP2_FLAG_NONE, 3, &pri_spec,
-                                   reqnv, ARRLEN(reqnv), NULL));
+  assert_int32(NGHTTP2_ERR_INVALID_ARGUMENT, ==,
+               nghttp2_submit_headers(session, NGHTTP2_FLAG_NONE, 3, &pri_spec,
+                                      reqnv, ARRLEN(reqnv), NULL));
 
   session->next_stream_id = 5;
   nghttp2_priority_spec_init(&pri_spec, 5, 16, 0);
 
-  CU_ASSERT(NGHTTP2_ERR_INVALID_ARGUMENT ==
-            nghttp2_submit_headers(session, NGHTTP2_FLAG_NONE, -1, &pri_spec,
-                                   reqnv, ARRLEN(reqnv), NULL));
+  assert_int32(NGHTTP2_ERR_INVALID_ARGUMENT, ==,
+               nghttp2_submit_headers(session, NGHTTP2_FLAG_NONE, -1, &pri_spec,
+                                      reqnv, ARRLEN(reqnv), NULL));
 
   nghttp2_session_del(session);
 
@@ -5921,14 +6131,14 @@ void test_nghttp2_submit_headers(void) {
 
   /* Sending nghttp2_submit_headers() with stream_id == 1 and server
      session is error */
-  CU_ASSERT(NGHTTP2_ERR_PROTO ==
-            nghttp2_submit_headers(session, NGHTTP2_FLAG_NONE, -1, NULL, reqnv,
-                                   ARRLEN(reqnv), NULL));
+  assert_int32(NGHTTP2_ERR_PROTO, ==,
+               nghttp2_submit_headers(session, NGHTTP2_FLAG_NONE, -1, NULL,
+                                      reqnv, ARRLEN(reqnv), NULL));
 
   /* Sending stream ID <= 0 is error */
-  CU_ASSERT(NGHTTP2_ERR_INVALID_ARGUMENT ==
-            nghttp2_submit_headers(session, NGHTTP2_FLAG_NONE, 0, NULL, resnv,
-                                   ARRLEN(resnv), NULL));
+  assert_int32(NGHTTP2_ERR_INVALID_ARGUMENT, ==,
+               nghttp2_submit_headers(session, NGHTTP2_FLAG_NONE, 0, NULL,
+                                      resnv, ARRLEN(resnv), NULL));
 
   nghttp2_session_del(session);
 }
@@ -5953,21 +6163,22 @@ void test_nghttp2_submit_headers_continuation(void) {
   }
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
   callbacks.on_frame_send_callback = on_frame_send_callback;
 
-  CU_ASSERT(0 == nghttp2_session_client_new(&session, &callbacks, &ud));
-  CU_ASSERT(1 == nghttp2_submit_headers(session, NGHTTP2_FLAG_END_STREAM, -1,
-                                        NULL, nv, ARRLEN(nv), NULL));
+  assert_int(0, ==, nghttp2_session_client_new(&session, &callbacks, &ud));
+  assert_int32(1, ==,
+               nghttp2_submit_headers(session, NGHTTP2_FLAG_END_STREAM, -1,
+                                      NULL, nv, ARRLEN(nv), NULL));
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(NGHTTP2_HEADERS == item->frame.hd.type);
-  CU_ASSERT((NGHTTP2_FLAG_END_STREAM | NGHTTP2_FLAG_END_HEADERS) ==
-            item->frame.hd.flags);
-  CU_ASSERT(0 == (item->frame.hd.flags & NGHTTP2_FLAG_PRIORITY));
+  assert_uint8(NGHTTP2_HEADERS, ==, item->frame.hd.type);
+  assert_uint8((NGHTTP2_FLAG_END_STREAM | NGHTTP2_FLAG_END_HEADERS), ==,
+               item->frame.hd.flags);
+  assert_false(item->frame.hd.flags & NGHTTP2_FLAG_PRIORITY);
 
   ud.frame_send_cb_called = 0;
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(1 == ud.frame_send_cb_called);
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_int(1, ==, ud.frame_send_cb_called);
 
   nghttp2_session_del(session);
 }
@@ -5992,7 +6203,7 @@ void test_nghttp2_submit_headers_continuation_extra_large(void) {
   }
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
   callbacks.on_frame_send_callback = on_frame_send_callback;
 
   /* The default size of max send header block length is too small to
@@ -6000,18 +6211,20 @@ void test_nghttp2_submit_headers_continuation_extra_large(void) {
   nghttp2_option_new(&opt);
   nghttp2_option_set_max_send_header_block_length(opt, 102400);
 
-  CU_ASSERT(0 == nghttp2_session_client_new2(&session, &callbacks, &ud, opt));
-  CU_ASSERT(1 == nghttp2_submit_headers(session, NGHTTP2_FLAG_END_STREAM, -1,
-                                        NULL, nv, ARRLEN(nv), NULL));
+  assert_int(0, ==,
+             nghttp2_session_client_new2(&session, &callbacks, &ud, opt));
+  assert_int32(1, ==,
+               nghttp2_submit_headers(session, NGHTTP2_FLAG_END_STREAM, -1,
+                                      NULL, nv, ARRLEN(nv), NULL));
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(NGHTTP2_HEADERS == item->frame.hd.type);
-  CU_ASSERT((NGHTTP2_FLAG_END_STREAM | NGHTTP2_FLAG_END_HEADERS) ==
-            item->frame.hd.flags);
-  CU_ASSERT(0 == (item->frame.hd.flags & NGHTTP2_FLAG_PRIORITY));
+  assert_uint8(NGHTTP2_HEADERS, ==, item->frame.hd.type);
+  assert_uint8((NGHTTP2_FLAG_END_STREAM | NGHTTP2_FLAG_END_HEADERS), ==,
+               item->frame.hd.flags);
+  assert_false(item->frame.hd.flags & NGHTTP2_FLAG_PRIORITY);
 
   ud.frame_send_cb_called = 0;
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(1 == ud.frame_send_cb_called);
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_int(1, ==, ud.frame_send_cb_called);
 
   nghttp2_session_del(session);
   nghttp2_option_del(opt);
@@ -6025,7 +6238,7 @@ void test_nghttp2_submit_priority(void) {
   nghttp2_priority_spec pri_spec;
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
   callbacks.on_frame_send_callback = on_frame_send_callback;
 
   nghttp2_session_client_new(&session, &callbacks, &ud);
@@ -6034,18 +6247,18 @@ void test_nghttp2_submit_priority(void) {
   nghttp2_priority_spec_init(&pri_spec, 0, 3, 0);
 
   /* depends on stream 0 */
-  CU_ASSERT(0 ==
-            nghttp2_submit_priority(session, NGHTTP2_FLAG_NONE, 1, &pri_spec));
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(3 == stream->weight);
+  assert_int(0, ==,
+             nghttp2_submit_priority(session, NGHTTP2_FLAG_NONE, 1, &pri_spec));
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_int32(3, ==, stream->weight);
 
   /* submit against idle stream */
-  CU_ASSERT(0 ==
-            nghttp2_submit_priority(session, NGHTTP2_FLAG_NONE, 3, &pri_spec));
+  assert_int(0, ==,
+             nghttp2_submit_priority(session, NGHTTP2_FLAG_NONE, 3, &pri_spec));
 
   ud.frame_send_cb_called = 0;
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(1 == ud.frame_send_cb_called);
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_int(1, ==, ud.frame_send_cb_called);
 
   nghttp2_session_del(session);
 }
@@ -6085,70 +6298,73 @@ void test_nghttp2_submit_settings(void) {
   iv[6].value = (uint32_t)NGHTTP2_MAX_WINDOW_SIZE + 1;
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
   callbacks.on_frame_send_callback = on_frame_send_callback;
   nghttp2_session_server_new(&session, &callbacks, &ud);
 
-  CU_ASSERT(NGHTTP2_ERR_INVALID_ARGUMENT ==
-            nghttp2_submit_settings(session, NGHTTP2_FLAG_NONE, iv, 7));
+  assert_int(NGHTTP2_ERR_INVALID_ARGUMENT, ==,
+             nghttp2_submit_settings(session, NGHTTP2_FLAG_NONE, iv, 7));
 
   /* Make sure that local settings are not changed */
-  CU_ASSERT(NGHTTP2_DEFAULT_MAX_CONCURRENT_STREAMS ==
-            session->local_settings.max_concurrent_streams);
-  CU_ASSERT(NGHTTP2_INITIAL_WINDOW_SIZE ==
-            session->local_settings.initial_window_size);
+  assert_uint32(NGHTTP2_DEFAULT_MAX_CONCURRENT_STREAMS, ==,
+                session->local_settings.max_concurrent_streams);
+  assert_uint32(NGHTTP2_INITIAL_WINDOW_SIZE, ==,
+                session->local_settings.initial_window_size);
 
   /* Now sends without 6th one */
-  CU_ASSERT(0 == nghttp2_submit_settings(session, NGHTTP2_FLAG_NONE, iv, 6));
+  assert_int(0, ==, nghttp2_submit_settings(session, NGHTTP2_FLAG_NONE, iv, 6));
 
   item = nghttp2_session_get_next_ob_item(session);
 
-  CU_ASSERT(NGHTTP2_SETTINGS == item->frame.hd.type);
+  assert_uint8(NGHTTP2_SETTINGS, ==, item->frame.hd.type);
 
   frame = &item->frame;
-  CU_ASSERT(6 == frame->settings.niv);
-  CU_ASSERT(5 == frame->settings.iv[0].value);
-  CU_ASSERT(NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS ==
-            frame->settings.iv[0].settings_id);
+  assert_size(6, ==, frame->settings.niv);
+  assert_uint32(5, ==, frame->settings.iv[0].value);
+  assert_int32(NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS, ==,
+               frame->settings.iv[0].settings_id);
 
-  CU_ASSERT(16 * 1024 == frame->settings.iv[1].value);
-  CU_ASSERT(NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE ==
-            frame->settings.iv[1].settings_id);
+  assert_uint32(16 * 1024, ==, frame->settings.iv[1].value);
+  assert_int32(NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE, ==,
+               frame->settings.iv[1].settings_id);
 
-  CU_ASSERT(UNKNOWN_ID == frame->settings.iv[4].settings_id);
-  CU_ASSERT(999 == frame->settings.iv[4].value);
+  assert_int32(UNKNOWN_ID, ==, frame->settings.iv[4].settings_id);
+  assert_uint32(999, ==, frame->settings.iv[4].value);
 
   ud.frame_send_cb_called = 0;
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(1 == ud.frame_send_cb_called);
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_int(1, ==, ud.frame_send_cb_called);
 
-  CU_ASSERT(50 == session->pending_local_max_concurrent_stream);
+  assert_uint32(50, ==, session->pending_local_max_concurrent_stream);
 
   /* before receiving SETTINGS ACK, local settings have still default
      values */
-  CU_ASSERT(NGHTTP2_DEFAULT_MAX_CONCURRENT_STREAMS ==
-            nghttp2_session_get_local_settings(
-                session, NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS));
-  CU_ASSERT(NGHTTP2_INITIAL_WINDOW_SIZE ==
-            nghttp2_session_get_local_settings(
-                session, NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE));
+  assert_uint32(NGHTTP2_DEFAULT_MAX_CONCURRENT_STREAMS, ==,
+                nghttp2_session_get_local_settings(
+                    session, NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS));
+  assert_uint32(NGHTTP2_INITIAL_WINDOW_SIZE, ==,
+                nghttp2_session_get_local_settings(
+                    session, NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE));
 
   nghttp2_frame_settings_init(&ack_frame.settings, NGHTTP2_FLAG_ACK, NULL, 0);
-  CU_ASSERT(0 == nghttp2_session_on_settings_received(session, &ack_frame, 0));
+  assert_int(0, ==,
+             nghttp2_session_on_settings_received(session, &ack_frame, 0));
   nghttp2_frame_settings_free(&ack_frame.settings, mem);
 
-  CU_ASSERT(16 * 1024 == session->local_settings.initial_window_size);
-  CU_ASSERT(111 == session->hd_inflater.ctx.hd_table_bufsize_max);
-  CU_ASSERT(111 == session->hd_inflater.min_hd_table_bufsize_max);
-  CU_ASSERT(50 == session->local_settings.max_concurrent_streams);
+  assert_uint32(16 * 1024, ==, session->local_settings.initial_window_size);
+  assert_size(111, ==, session->hd_inflater.ctx.hd_table_bufsize_max);
+  assert_size(111, ==, session->hd_inflater.min_hd_table_bufsize_max);
+  assert_uint32(50, ==, session->local_settings.max_concurrent_streams);
 
-  CU_ASSERT(50 == nghttp2_session_get_local_settings(
-                      session, NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS));
-  CU_ASSERT(16 * 1024 == nghttp2_session_get_local_settings(
-                             session, NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE));
+  assert_uint32(50, ==,
+                nghttp2_session_get_local_settings(
+                    session, NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS));
+  assert_uint32(16 * 1024, ==,
+                nghttp2_session_get_local_settings(
+                    session, NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE));
 
   /* We just keep the last seen value */
-  CU_ASSERT(50 == session->pending_local_max_concurrent_stream);
+  assert_uint32(50, ==, session->pending_local_max_concurrent_stream);
 
   nghttp2_session_del(session);
 
@@ -6161,8 +6377,8 @@ void test_nghttp2_submit_settings(void) {
   iv[1].settings_id = NGHTTP2_SETTINGS_NO_RFC7540_PRIORITIES;
   iv[1].value = 0;
 
-  CU_ASSERT(NGHTTP2_ERR_INVALID_ARGUMENT ==
-            nghttp2_submit_settings(session, NGHTTP2_FLAG_NONE, iv, 2));
+  assert_int(NGHTTP2_ERR_INVALID_ARGUMENT, ==,
+             nghttp2_submit_settings(session, NGHTTP2_FLAG_NONE, iv, 2));
 
   nghttp2_session_del(session);
 
@@ -6173,13 +6389,13 @@ void test_nghttp2_submit_settings(void) {
   iv[0].settings_id = NGHTTP2_SETTINGS_NO_RFC7540_PRIORITIES;
   iv[0].value = 1;
 
-  CU_ASSERT(0 == nghttp2_submit_settings(session, NGHTTP2_FLAG_NONE, iv, 1));
+  assert_int(0, ==, nghttp2_submit_settings(session, NGHTTP2_FLAG_NONE, iv, 1));
 
   iv[0].settings_id = NGHTTP2_SETTINGS_NO_RFC7540_PRIORITIES;
   iv[0].value = 0;
 
-  CU_ASSERT(NGHTTP2_ERR_INVALID_ARGUMENT ==
-            nghttp2_submit_settings(session, NGHTTP2_FLAG_NONE, iv, 1));
+  assert_int(NGHTTP2_ERR_INVALID_ARGUMENT, ==,
+             nghttp2_submit_settings(session, NGHTTP2_FLAG_NONE, iv, 1));
 
   nghttp2_session_del(session);
 }
@@ -6201,7 +6417,7 @@ void test_nghttp2_submit_settings_update_local_window_size(void) {
   iv[0].value = 16 * 1024;
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   nghttp2_session_server_new(&session, &callbacks, NULL);
 
@@ -6211,20 +6427,21 @@ void test_nghttp2_submit_settings_update_local_window_size(void) {
 
   open_recv_stream(session, 3);
 
-  CU_ASSERT(0 == nghttp2_submit_settings(session, NGHTTP2_FLAG_NONE, iv, 1));
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(0 == nghttp2_session_on_settings_received(session, &ack_frame, 0));
+  assert_int(0, ==, nghttp2_submit_settings(session, NGHTTP2_FLAG_NONE, iv, 1));
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_int(0, ==,
+             nghttp2_session_on_settings_received(session, &ack_frame, 0));
 
   stream = nghttp2_session_get_stream(session, 1);
-  CU_ASSERT(0 == stream->recv_window_size);
-  CU_ASSERT(16 * 1024 + 100 == stream->local_window_size);
+  assert_int32(0, ==, stream->recv_window_size);
+  assert_int32(16 * 1024 + 100, ==, stream->local_window_size);
 
   stream = nghttp2_session_get_stream(session, 3);
-  CU_ASSERT(16 * 1024 == stream->local_window_size);
+  assert_int32(16 * 1024, ==, stream->local_window_size);
 
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(NGHTTP2_WINDOW_UPDATE == item->frame.hd.type);
-  CU_ASSERT(32768 == item->frame.window_update.window_size_increment);
+  assert_uint8(NGHTTP2_WINDOW_UPDATE, ==, item->frame.hd.type);
+  assert_int32(32768, ==, item->frame.window_update.window_size_increment);
 
   nghttp2_session_del(session);
 
@@ -6240,17 +6457,18 @@ void test_nghttp2_submit_settings_update_local_window_size(void) {
   stream->local_window_size = NGHTTP2_INITIAL_WINDOW_SIZE + 100;
   stream->recv_window_size = 32768;
 
-  CU_ASSERT(0 == nghttp2_submit_settings(session, NGHTTP2_FLAG_NONE, iv, 1));
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(0 == nghttp2_session_on_settings_received(session, &ack_frame, 0));
+  assert_int(0, ==, nghttp2_submit_settings(session, NGHTTP2_FLAG_NONE, iv, 1));
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_int(0, ==,
+             nghttp2_session_on_settings_received(session, &ack_frame, 0));
 
   stream = nghttp2_session_get_stream(session, 1);
 
-  CU_ASSERT(32768 == stream->recv_window_size);
-  CU_ASSERT(16 * 1024 + 100 == stream->local_window_size);
+  assert_int32(32768, ==, stream->recv_window_size);
+  assert_int32(16 * 1024 + 100, ==, stream->local_window_size);
   /* Check that we can handle the case where local_window_size <
      recv_window_size */
-  CU_ASSERT(0 == nghttp2_session_get_stream_local_window_size(session, 1));
+  assert_int32(0, ==, nghttp2_session_get_stream_local_window_size(session, 1));
 
   nghttp2_session_del(session);
 
@@ -6260,13 +6478,15 @@ void test_nghttp2_submit_settings_update_local_window_size(void) {
   stream = open_recv_stream(session, 1);
   stream->local_window_size = NGHTTP2_MAX_WINDOW_SIZE;
 
-  CU_ASSERT(0 == nghttp2_submit_settings(session, NGHTTP2_FLAG_NONE, iv, 1));
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(0 == nghttp2_session_on_settings_received(session, &ack_frame, 0));
+  assert_int(0, ==, nghttp2_submit_settings(session, NGHTTP2_FLAG_NONE, iv, 1));
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_int(0, ==,
+             nghttp2_session_on_settings_received(session, &ack_frame, 0));
 
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(NGHTTP2_RST_STREAM == item->frame.hd.type);
-  CU_ASSERT(NGHTTP2_FLOW_CONTROL_ERROR == item->frame.rst_stream.error_code);
+  assert_uint8(NGHTTP2_RST_STREAM, ==, item->frame.hd.type);
+  assert_uint32(NGHTTP2_FLOW_CONTROL_ERROR, ==,
+                item->frame.rst_stream.error_code);
 
   nghttp2_session_del(session);
   nghttp2_frame_settings_free(&ack_frame.settings, mem);
@@ -6280,7 +6500,7 @@ void test_nghttp2_submit_settings_multiple_times(void) {
   nghttp2_inflight_settings *inflight_settings;
 
   memset(&callbacks, 0, sizeof(callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   nghttp2_session_client_new(&session, &callbacks, NULL);
 
@@ -6291,60 +6511,60 @@ void test_nghttp2_submit_settings_multiple_times(void) {
   iv[1].settings_id = NGHTTP2_SETTINGS_ENABLE_PUSH;
   iv[1].value = 0;
 
-  CU_ASSERT(0 == nghttp2_submit_settings(session, NGHTTP2_FLAG_NONE, iv, 2));
+  assert_int(0, ==, nghttp2_submit_settings(session, NGHTTP2_FLAG_NONE, iv, 2));
 
   inflight_settings = session->inflight_settings_head;
 
-  CU_ASSERT(NULL != inflight_settings);
-  CU_ASSERT(NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS ==
-            inflight_settings->iv[0].settings_id);
-  CU_ASSERT(100 == inflight_settings->iv[0].value);
-  CU_ASSERT(2 == inflight_settings->niv);
-  CU_ASSERT(NULL == inflight_settings->next);
+  assert_not_null(inflight_settings);
+  assert_int32(NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS, ==,
+               inflight_settings->iv[0].settings_id);
+  assert_uint32(100, ==, inflight_settings->iv[0].value);
+  assert_size(2, ==, inflight_settings->niv);
+  assert_null(inflight_settings->next);
 
-  CU_ASSERT(100 == session->pending_local_max_concurrent_stream);
-  CU_ASSERT(0 == session->pending_enable_push);
+  assert_uint32(100, ==, session->pending_local_max_concurrent_stream);
+  assert_uint8(0, ==, session->pending_enable_push);
 
   /* second SETTINGS */
   iv[0].settings_id = NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS;
   iv[0].value = 99;
 
-  CU_ASSERT(0 == nghttp2_submit_settings(session, NGHTTP2_FLAG_NONE, iv, 1));
+  assert_int(0, ==, nghttp2_submit_settings(session, NGHTTP2_FLAG_NONE, iv, 1));
 
   inflight_settings = session->inflight_settings_head->next;
 
-  CU_ASSERT(NULL != inflight_settings);
-  CU_ASSERT(NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS ==
-            inflight_settings->iv[0].settings_id);
-  CU_ASSERT(99 == inflight_settings->iv[0].value);
-  CU_ASSERT(1 == inflight_settings->niv);
-  CU_ASSERT(NULL == inflight_settings->next);
+  assert_not_null(inflight_settings);
+  assert_int32(NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS, ==,
+               inflight_settings->iv[0].settings_id);
+  assert_uint32(99, ==, inflight_settings->iv[0].value);
+  assert_size(1, ==, inflight_settings->niv);
+  assert_null(inflight_settings->next);
 
-  CU_ASSERT(99 == session->pending_local_max_concurrent_stream);
-  CU_ASSERT(0 == session->pending_enable_push);
+  assert_uint32(99, ==, session->pending_local_max_concurrent_stream);
+  assert_uint8(0, ==, session->pending_enable_push);
 
   nghttp2_frame_settings_init(&frame.settings, NGHTTP2_FLAG_ACK, NULL, 0);
 
   /* receive SETTINGS ACK */
-  CU_ASSERT(0 == nghttp2_session_on_settings_received(session, &frame, 0));
+  assert_int(0, ==, nghttp2_session_on_settings_received(session, &frame, 0));
 
   inflight_settings = session->inflight_settings_head;
 
   /* first inflight SETTINGS was removed */
-  CU_ASSERT(NULL != inflight_settings);
-  CU_ASSERT(NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS ==
-            inflight_settings->iv[0].settings_id);
-  CU_ASSERT(99 == inflight_settings->iv[0].value);
-  CU_ASSERT(1 == inflight_settings->niv);
-  CU_ASSERT(NULL == inflight_settings->next);
+  assert_not_null(inflight_settings);
+  assert_int32(NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS, ==,
+               inflight_settings->iv[0].settings_id);
+  assert_uint32(99, ==, inflight_settings->iv[0].value);
+  assert_size(1, ==, inflight_settings->niv);
+  assert_null(inflight_settings->next);
 
-  CU_ASSERT(100 == session->local_settings.max_concurrent_streams);
+  assert_uint32(100, ==, session->local_settings.max_concurrent_streams);
 
   /* receive SETTINGS ACK again */
-  CU_ASSERT(0 == nghttp2_session_on_settings_received(session, &frame, 0));
+  assert_int(0, ==, nghttp2_session_on_settings_received(session, &frame, 0));
 
-  CU_ASSERT(NULL == session->inflight_settings_head);
-  CU_ASSERT(99 == session->local_settings.max_concurrent_streams);
+  assert_null(session->inflight_settings_head);
+  assert_uint32(99, ==, session->local_settings.max_concurrent_streams);
 
   nghttp2_session_del(session);
 }
@@ -6356,42 +6576,43 @@ void test_nghttp2_submit_push_promise(void) {
   nghttp2_stream *stream;
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
   callbacks.on_frame_send_callback = on_frame_send_callback;
   callbacks.on_frame_not_send_callback = on_frame_not_send_callback;
 
-  CU_ASSERT(0 == nghttp2_session_server_new(&session, &callbacks, &ud));
+  assert_int(0, ==, nghttp2_session_server_new(&session, &callbacks, &ud));
   open_recv_stream(session, 1);
-  CU_ASSERT(2 == nghttp2_submit_push_promise(session, NGHTTP2_FLAG_NONE, 1,
-                                             reqnv, ARRLEN(reqnv), &ud));
+  assert_int32(2, ==,
+               nghttp2_submit_push_promise(session, NGHTTP2_FLAG_NONE, 1, reqnv,
+                                           ARRLEN(reqnv), &ud));
 
   stream = nghttp2_session_get_stream(session, 2);
 
-  CU_ASSERT(NULL != stream);
-  CU_ASSERT(NGHTTP2_STREAM_RESERVED == stream->state);
-  CU_ASSERT(&ud == nghttp2_session_get_stream_user_data(session, 2));
+  assert_not_null(stream);
+  assert_enum(nghttp2_stream_state, NGHTTP2_STREAM_RESERVED, ==, stream->state);
+  assert_ptr_equal(&ud, nghttp2_session_get_stream_user_data(session, 2));
 
   ud.frame_send_cb_called = 0;
   ud.sent_frame_type = 0;
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(1 == ud.frame_send_cb_called);
-  CU_ASSERT(NGHTTP2_PUSH_PROMISE == ud.sent_frame_type);
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_int(1, ==, ud.frame_send_cb_called);
+  assert_uint8(NGHTTP2_PUSH_PROMISE, ==, ud.sent_frame_type);
 
   stream = nghttp2_session_get_stream(session, 2);
 
-  CU_ASSERT(NGHTTP2_STREAM_RESERVED == stream->state);
-  CU_ASSERT(&ud == nghttp2_session_get_stream_user_data(session, 2));
+  assert_enum(nghttp2_stream_state, NGHTTP2_STREAM_RESERVED, ==, stream->state);
+  assert_ptr_equal(&ud, nghttp2_session_get_stream_user_data(session, 2));
 
   /* submit PUSH_PROMISE while associated stream is not opened */
-  CU_ASSERT(NGHTTP2_ERR_STREAM_CLOSED ==
-            nghttp2_submit_push_promise(session, NGHTTP2_FLAG_NONE, 3, reqnv,
-                                        ARRLEN(reqnv), NULL));
+  assert_int32(NGHTTP2_ERR_STREAM_CLOSED, ==,
+               nghttp2_submit_push_promise(session, NGHTTP2_FLAG_NONE, 3, reqnv,
+                                           ARRLEN(reqnv), NULL));
 
   /* Stream ID <= 0 is error */
-  CU_ASSERT(NGHTTP2_ERR_INVALID_ARGUMENT ==
-            nghttp2_submit_push_promise(session, NGHTTP2_FLAG_NONE, 0, reqnv,
-                                        ARRLEN(reqnv), NULL));
+  assert_int32(NGHTTP2_ERR_INVALID_ARGUMENT, ==,
+               nghttp2_submit_push_promise(session, NGHTTP2_FLAG_NONE, 0, reqnv,
+                                           ARRLEN(reqnv), NULL));
 
   nghttp2_session_del(session);
 }
@@ -6404,42 +6625,42 @@ void test_nghttp2_submit_window_update(void) {
   nghttp2_stream *stream;
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   nghttp2_session_client_new(&session, &callbacks, &ud);
   stream = open_recv_stream(session, 2);
   stream->recv_window_size = 4096;
 
-  CU_ASSERT(0 ==
-            nghttp2_submit_window_update(session, NGHTTP2_FLAG_NONE, 2, 1024));
+  assert_int(0, ==,
+             nghttp2_submit_window_update(session, NGHTTP2_FLAG_NONE, 2, 1024));
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(NGHTTP2_WINDOW_UPDATE == item->frame.hd.type);
-  CU_ASSERT(1024 == item->frame.window_update.window_size_increment);
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(3072 == stream->recv_window_size);
+  assert_uint8(NGHTTP2_WINDOW_UPDATE, ==, item->frame.hd.type);
+  assert_int32(1024, ==, item->frame.window_update.window_size_increment);
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_int32(3072, ==, stream->recv_window_size);
 
-  CU_ASSERT(0 ==
-            nghttp2_submit_window_update(session, NGHTTP2_FLAG_NONE, 2, 4096));
+  assert_int(0, ==,
+             nghttp2_submit_window_update(session, NGHTTP2_FLAG_NONE, 2, 4096));
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(NGHTTP2_WINDOW_UPDATE == item->frame.hd.type);
-  CU_ASSERT(4096 == item->frame.window_update.window_size_increment);
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(0 == stream->recv_window_size);
+  assert_uint8(NGHTTP2_WINDOW_UPDATE, ==, item->frame.hd.type);
+  assert_int32(4096, ==, item->frame.window_update.window_size_increment);
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_int32(0, ==, stream->recv_window_size);
 
-  CU_ASSERT(0 ==
-            nghttp2_submit_window_update(session, NGHTTP2_FLAG_NONE, 2, 4096));
+  assert_int(0, ==,
+             nghttp2_submit_window_update(session, NGHTTP2_FLAG_NONE, 2, 4096));
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(NGHTTP2_WINDOW_UPDATE == item->frame.hd.type);
-  CU_ASSERT(4096 == item->frame.window_update.window_size_increment);
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(0 == stream->recv_window_size);
+  assert_uint8(NGHTTP2_WINDOW_UPDATE, ==, item->frame.hd.type);
+  assert_int32(4096, ==, item->frame.window_update.window_size_increment);
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_int32(0, ==, stream->recv_window_size);
 
-  CU_ASSERT(0 ==
-            nghttp2_submit_window_update(session, NGHTTP2_FLAG_NONE, 2, 0));
+  assert_int(0, ==,
+             nghttp2_submit_window_update(session, NGHTTP2_FLAG_NONE, 2, 0));
   /* It is ok if stream is closed or does not exist at the call
      time */
-  CU_ASSERT(0 ==
-            nghttp2_submit_window_update(session, NGHTTP2_FLAG_NONE, 4, 4096));
+  assert_int(0, ==,
+             nghttp2_submit_window_update(session, NGHTTP2_FLAG_NONE, 4, 4096));
 
   nghttp2_session_del(session);
 }
@@ -6451,81 +6672,87 @@ void test_nghttp2_submit_window_update_local_window_size(void) {
   nghttp2_stream *stream;
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   nghttp2_session_client_new(&session, &callbacks, NULL);
   stream = open_recv_stream(session, 2);
   stream->recv_window_size = 4096;
 
-  CU_ASSERT(0 == nghttp2_submit_window_update(session, NGHTTP2_FLAG_NONE, 2,
-                                              stream->recv_window_size + 1));
-  CU_ASSERT(NGHTTP2_INITIAL_WINDOW_SIZE + 1 == stream->local_window_size);
-  CU_ASSERT(0 == stream->recv_window_size);
+  assert_int(0, ==,
+             nghttp2_submit_window_update(session, NGHTTP2_FLAG_NONE, 2,
+                                          stream->recv_window_size + 1));
+  assert_int32(NGHTTP2_INITIAL_WINDOW_SIZE + 1, ==, stream->local_window_size);
+  assert_int32(0, ==, stream->recv_window_size);
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(NGHTTP2_WINDOW_UPDATE == item->frame.hd.type);
-  CU_ASSERT(4097 == item->frame.window_update.window_size_increment);
+  assert_uint8(NGHTTP2_WINDOW_UPDATE, ==, item->frame.hd.type);
+  assert_int32(4097, ==, item->frame.window_update.window_size_increment);
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
 
   /* Let's decrement local window size */
   stream->recv_window_size = 4096;
-  CU_ASSERT(0 == nghttp2_submit_window_update(session, NGHTTP2_FLAG_NONE, 2,
-                                              -stream->local_window_size / 2));
-  CU_ASSERT(32768 == stream->local_window_size);
-  CU_ASSERT(-28672 == stream->recv_window_size);
-  CU_ASSERT(32768 == stream->recv_reduction);
+  assert_int(0, ==,
+             nghttp2_submit_window_update(session, NGHTTP2_FLAG_NONE, 2,
+                                          -stream->local_window_size / 2));
+  assert_int32(32768, ==, stream->local_window_size);
+  assert_int32(-28672, ==, stream->recv_window_size);
+  assert_int32(32768, ==, stream->recv_reduction);
 
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(item == NULL);
+  assert_null(item);
 
   /* Increase local window size */
-  CU_ASSERT(0 ==
-            nghttp2_submit_window_update(session, NGHTTP2_FLAG_NONE, 2, 16384));
-  CU_ASSERT(49152 == stream->local_window_size);
-  CU_ASSERT(-12288 == stream->recv_window_size);
-  CU_ASSERT(16384 == stream->recv_reduction);
-  CU_ASSERT(NULL == nghttp2_session_get_next_ob_item(session));
+  assert_int(
+      0, ==,
+      nghttp2_submit_window_update(session, NGHTTP2_FLAG_NONE, 2, 16384));
+  assert_int32(49152, ==, stream->local_window_size);
+  assert_int32(-12288, ==, stream->recv_window_size);
+  assert_int32(16384, ==, stream->recv_reduction);
+  assert_null(nghttp2_session_get_next_ob_item(session));
 
-  CU_ASSERT(NGHTTP2_ERR_FLOW_CONTROL ==
-            nghttp2_submit_window_update(session, NGHTTP2_FLAG_NONE, 2,
-                                         NGHTTP2_MAX_WINDOW_SIZE));
+  assert_int(NGHTTP2_ERR_FLOW_CONTROL, ==,
+             nghttp2_submit_window_update(session, NGHTTP2_FLAG_NONE, 2,
+                                          NGHTTP2_MAX_WINDOW_SIZE));
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
 
   /* Check connection-level flow control */
   session->recv_window_size = 4096;
-  CU_ASSERT(0 == nghttp2_submit_window_update(session, NGHTTP2_FLAG_NONE, 0,
-                                              session->recv_window_size + 1));
-  CU_ASSERT(NGHTTP2_INITIAL_CONNECTION_WINDOW_SIZE + 1 ==
-            session->local_window_size);
-  CU_ASSERT(0 == session->recv_window_size);
+  assert_int(0, ==,
+             nghttp2_submit_window_update(session, NGHTTP2_FLAG_NONE, 0,
+                                          session->recv_window_size + 1));
+  assert_int32(NGHTTP2_INITIAL_CONNECTION_WINDOW_SIZE + 1, ==,
+               session->local_window_size);
+  assert_int32(0, ==, session->recv_window_size);
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(NGHTTP2_WINDOW_UPDATE == item->frame.hd.type);
-  CU_ASSERT(4097 == item->frame.window_update.window_size_increment);
+  assert_uint8(NGHTTP2_WINDOW_UPDATE, ==, item->frame.hd.type);
+  assert_int32(4097, ==, item->frame.window_update.window_size_increment);
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
 
   /* Go decrement part */
   session->recv_window_size = 4096;
-  CU_ASSERT(0 == nghttp2_submit_window_update(session, NGHTTP2_FLAG_NONE, 0,
-                                              -session->local_window_size / 2));
-  CU_ASSERT(32768 == session->local_window_size);
-  CU_ASSERT(-28672 == session->recv_window_size);
-  CU_ASSERT(32768 == session->recv_reduction);
+  assert_int(0, ==,
+             nghttp2_submit_window_update(session, NGHTTP2_FLAG_NONE, 0,
+                                          -session->local_window_size / 2));
+  assert_int32(32768, ==, session->local_window_size);
+  assert_int32(-28672, ==, session->recv_window_size);
+  assert_int32(32768, ==, session->recv_reduction);
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(item == NULL);
+  assert_null(item);
 
   /* Increase local window size */
-  CU_ASSERT(0 ==
-            nghttp2_submit_window_update(session, NGHTTP2_FLAG_NONE, 0, 16384));
-  CU_ASSERT(49152 == session->local_window_size);
-  CU_ASSERT(-12288 == session->recv_window_size);
-  CU_ASSERT(16384 == session->recv_reduction);
-  CU_ASSERT(NULL == nghttp2_session_get_next_ob_item(session));
+  assert_int(
+      0, ==,
+      nghttp2_submit_window_update(session, NGHTTP2_FLAG_NONE, 0, 16384));
+  assert_int32(49152, ==, session->local_window_size);
+  assert_int32(-12288, ==, session->recv_window_size);
+  assert_int32(16384, ==, session->recv_reduction);
+  assert_null(nghttp2_session_get_next_ob_item(session));
 
-  CU_ASSERT(NGHTTP2_ERR_FLOW_CONTROL ==
-            nghttp2_submit_window_update(session, NGHTTP2_FLAG_NONE, 0,
-                                         NGHTTP2_MAX_WINDOW_SIZE));
+  assert_int(NGHTTP2_ERR_FLOW_CONTROL, ==,
+             nghttp2_submit_window_update(session, NGHTTP2_FLAG_NONE, 0,
+                                          NGHTTP2_MAX_WINDOW_SIZE));
 
   nghttp2_session_del(session);
 }
@@ -6536,43 +6763,44 @@ void test_nghttp2_submit_shutdown_notice(void) {
   my_user_data ud;
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
   callbacks.on_frame_send_callback = on_frame_send_callback;
   callbacks.on_frame_not_send_callback = on_frame_not_send_callback;
 
   nghttp2_session_server_new(&session, &callbacks, &ud);
 
-  CU_ASSERT(0 == nghttp2_submit_shutdown_notice(session));
+  assert_int(0, ==, nghttp2_submit_shutdown_notice(session));
 
   ud.frame_send_cb_called = 0;
 
   nghttp2_session_send(session);
 
-  CU_ASSERT(1 == ud.frame_send_cb_called);
-  CU_ASSERT(NGHTTP2_GOAWAY == ud.sent_frame_type);
-  CU_ASSERT((1u << 31) - 1 == session->local_last_stream_id);
+  assert_int(1, ==, ud.frame_send_cb_called);
+  assert_uint8(NGHTTP2_GOAWAY, ==, ud.sent_frame_type);
+  assert_int32((1u << 31) - 1, ==, session->local_last_stream_id);
 
   /* After another GOAWAY, nghttp2_submit_shutdown_notice() is
      noop. */
-  CU_ASSERT(0 == nghttp2_session_terminate_session(session, NGHTTP2_NO_ERROR));
+  assert_int(0, ==,
+             nghttp2_session_terminate_session(session, NGHTTP2_NO_ERROR));
 
   ud.frame_send_cb_called = 0;
 
   nghttp2_session_send(session);
 
-  CU_ASSERT(1 == ud.frame_send_cb_called);
-  CU_ASSERT(NGHTTP2_GOAWAY == ud.sent_frame_type);
-  CU_ASSERT(0 == session->local_last_stream_id);
+  assert_int(1, ==, ud.frame_send_cb_called);
+  assert_uint8(NGHTTP2_GOAWAY, ==, ud.sent_frame_type);
+  assert_int32(0, ==, session->local_last_stream_id);
 
-  CU_ASSERT(0 == nghttp2_submit_shutdown_notice(session));
+  assert_int(0, ==, nghttp2_submit_shutdown_notice(session));
 
   ud.frame_send_cb_called = 0;
   ud.frame_not_send_cb_called = 0;
 
   nghttp2_session_send(session);
 
-  CU_ASSERT(0 == ud.frame_send_cb_called);
-  CU_ASSERT(0 == ud.frame_not_send_cb_called);
+  assert_int(0, ==, ud.frame_send_cb_called);
+  assert_int(0, ==, ud.frame_not_send_cb_called);
 
   nghttp2_session_del(session);
 
@@ -6580,8 +6808,8 @@ void test_nghttp2_submit_shutdown_notice(void) {
      is error */
   nghttp2_session_client_new(&session, &callbacks, NULL);
 
-  CU_ASSERT(NGHTTP2_ERR_INVALID_STATE ==
-            nghttp2_submit_shutdown_notice(session));
+  assert_int(NGHTTP2_ERR_INVALID_STATE, ==,
+             nghttp2_submit_shutdown_notice(session));
 
   nghttp2_session_del(session);
 }
@@ -6597,31 +6825,35 @@ void test_nghttp2_submit_invalid_nv(void) {
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
 
-  CU_ASSERT(0 == nghttp2_session_server_new(&session, &callbacks, NULL));
+  assert_int(0, ==, nghttp2_session_server_new(&session, &callbacks, NULL));
 
   /* nghttp2_submit_response */
-  CU_ASSERT(0 == nghttp2_submit_response(session, 2, empty_name_nv,
-                                         ARRLEN(empty_name_nv), NULL));
+  assert_int(0, ==,
+             nghttp2_submit_response2(session, 2, empty_name_nv,
+                                      ARRLEN(empty_name_nv), NULL));
 
   /* nghttp2_submit_push_promise */
   open_recv_stream(session, 1);
 
-  CU_ASSERT(0 < nghttp2_submit_push_promise(session, NGHTTP2_FLAG_NONE, 1,
-                                            empty_name_nv,
-                                            ARRLEN(empty_name_nv), NULL));
+  assert_int32(0, <,
+               nghttp2_submit_push_promise(session, NGHTTP2_FLAG_NONE, 1,
+                                           empty_name_nv, ARRLEN(empty_name_nv),
+                                           NULL));
 
   nghttp2_session_del(session);
 
-  CU_ASSERT(0 == nghttp2_session_client_new(&session, &callbacks, NULL));
+  assert_int(0, ==, nghttp2_session_client_new(&session, &callbacks, NULL));
 
   /* nghttp2_submit_request */
-  CU_ASSERT(0 < nghttp2_submit_request(session, NULL, empty_name_nv,
+  assert_int32(0, <,
+               nghttp2_submit_request2(session, NULL, empty_name_nv,
                                        ARRLEN(empty_name_nv), NULL, NULL));
 
   /* nghttp2_submit_headers */
-  CU_ASSERT(0 < nghttp2_submit_headers(session, NGHTTP2_FLAG_NONE, -1, NULL,
-                                       empty_name_nv, ARRLEN(empty_name_nv),
-                                       NULL));
+  assert_int32(0, <,
+               nghttp2_submit_headers(session, NGHTTP2_FLAG_NONE, -1, NULL,
+                                      empty_name_nv, ARRLEN(empty_name_nv),
+                                      NULL));
 
   nghttp2_session_del(session);
 }
@@ -6641,8 +6873,8 @@ void test_nghttp2_submit_extension(void) {
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
 
-  callbacks.pack_extension_callback = pack_extension_callback;
-  callbacks.send_callback = accumulator_send_callback;
+  callbacks.pack_extension_callback2 = pack_extension_callback;
+  callbacks.send_callback2 = accumulator_send_callback;
 
   nghttp2_buf_init2(&ud.scratchbuf, 4096, mem);
 
@@ -6653,25 +6885,25 @@ void test_nghttp2_submit_extension(void) {
 
   rv = nghttp2_submit_extension(session, 211, 0x01, 3, &ud.scratchbuf);
 
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   acc.length = 0;
 
   rv = nghttp2_session_send(session);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(NGHTTP2_FRAME_HDLEN + sizeof(data) == acc.length);
+  assert_int(0, ==, rv);
+  assert_size(NGHTTP2_FRAME_HDLEN + sizeof(data), ==, acc.length);
 
   len = nghttp2_get_uint32(acc.buf) >> 8;
 
-  CU_ASSERT(sizeof(data) == len);
-  CU_ASSERT(211 == acc.buf[3]);
-  CU_ASSERT(0x01 == acc.buf[4]);
+  assert_size(sizeof(data), ==, len);
+  assert_uint8(211, ==, acc.buf[3]);
+  assert_uint8(0x01, ==, acc.buf[4]);
 
   stream_id = (int32_t)nghttp2_get_uint32(acc.buf + 5);
 
-  CU_ASSERT(3 == stream_id);
-  CU_ASSERT(0 == memcmp(data, &acc.buf[NGHTTP2_FRAME_HDLEN], sizeof(data)));
+  assert_int32(3, ==, stream_id);
+  assert_memory_equal(sizeof(data), data, &acc.buf[NGHTTP2_FRAME_HDLEN]);
 
   nghttp2_session_del(session);
 
@@ -6681,7 +6913,7 @@ void test_nghttp2_submit_extension(void) {
   rv = nghttp2_submit_extension(session, NGHTTP2_GOAWAY, NGHTTP2_FLAG_NONE, 0,
                                 NULL);
 
-  CU_ASSERT(NGHTTP2_ERR_INVALID_ARGUMENT == rv);
+  assert_int(NGHTTP2_ERR_INVALID_ARGUMENT, ==, rv);
 
   nghttp2_session_del(session);
   nghttp2_buf_free(&ud.scratchbuf, mem);
@@ -6692,7 +6924,7 @@ void test_nghttp2_submit_altsvc(void) {
   nghttp2_session_callbacks callbacks;
   my_user_data ud;
   int rv;
-  ssize_t len;
+  nghttp2_ssize len;
   const uint8_t *data;
   nghttp2_frame_hd hd;
   size_t origin_len;
@@ -6707,42 +6939,42 @@ void test_nghttp2_submit_altsvc(void) {
                              sizeof(origin) - 1, field_value,
                              sizeof(field_value) - 1);
 
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   ud.frame_send_cb_called = 0;
 
-  len = nghttp2_session_mem_send(session, &data);
+  len = nghttp2_session_mem_send2(session, &data);
 
-  CU_ASSERT(len == NGHTTP2_FRAME_HDLEN + 2 + sizeof(origin) - 1 +
-                       sizeof(field_value) - 1);
+  assert_ptrdiff(NGHTTP2_FRAME_HDLEN + 2 + sizeof(origin) - 1 +
+                     sizeof(field_value) - 1,
+                 ==, len);
 
   nghttp2_frame_unpack_frame_hd(&hd, data);
 
-  CU_ASSERT(2 + sizeof(origin) - 1 + sizeof(field_value) - 1 == hd.length);
-  CU_ASSERT(NGHTTP2_ALTSVC == hd.type);
-  CU_ASSERT(NGHTTP2_FLAG_NONE == hd.flags);
+  assert_size(2 + sizeof(origin) - 1 + sizeof(field_value) - 1, ==, hd.length);
+  assert_uint8(NGHTTP2_ALTSVC, ==, hd.type);
+  assert_uint8(NGHTTP2_FLAG_NONE, ==, hd.flags);
 
   origin_len = nghttp2_get_uint16(data + NGHTTP2_FRAME_HDLEN);
 
-  CU_ASSERT(sizeof(origin) - 1 == origin_len);
-  CU_ASSERT(0 ==
-            memcmp(origin, data + NGHTTP2_FRAME_HDLEN + 2, sizeof(origin) - 1));
-  CU_ASSERT(0 == memcmp(field_value,
-                        data + NGHTTP2_FRAME_HDLEN + 2 + sizeof(origin) - 1,
-                        hd.length - (sizeof(origin) - 1) - 2));
+  assert_size(sizeof(origin) - 1, ==, origin_len);
+  assert_memory_equal(sizeof(origin) - 1, origin,
+                      data + NGHTTP2_FRAME_HDLEN + 2);
+  assert_memory_equal(hd.length - (sizeof(origin) - 1) - 2, field_value,
+                      data + NGHTTP2_FRAME_HDLEN + 2 + sizeof(origin) - 1);
 
   /* submitting empty origin with stream_id == 0 is error */
   rv = nghttp2_submit_altsvc(session, NGHTTP2_FLAG_NONE, 0, NULL, 0,
                              field_value, sizeof(field_value) - 1);
 
-  CU_ASSERT(NGHTTP2_ERR_INVALID_ARGUMENT == rv);
+  assert_int(NGHTTP2_ERR_INVALID_ARGUMENT, ==, rv);
 
   /* submitting non-empty origin with stream_id != 0 is error */
   rv = nghttp2_submit_altsvc(session, NGHTTP2_FLAG_NONE, 1, origin,
                              sizeof(origin) - 1, field_value,
                              sizeof(field_value) - 1);
 
-  CU_ASSERT(NGHTTP2_ERR_INVALID_ARGUMENT == rv);
+  assert_int(NGHTTP2_ERR_INVALID_ARGUMENT, ==, rv);
 
   nghttp2_session_del(session);
 
@@ -6753,7 +6985,7 @@ void test_nghttp2_submit_altsvc(void) {
                              sizeof(origin) - 1, field_value,
                              sizeof(field_value) - 1);
 
-  CU_ASSERT(NGHTTP2_ERR_INVALID_STATE == rv);
+  assert_int(NGHTTP2_ERR_INVALID_STATE, ==, rv);
 
   nghttp2_session_del(session);
 }
@@ -6763,7 +6995,7 @@ void test_nghttp2_submit_origin(void) {
   nghttp2_session_callbacks callbacks;
   my_user_data ud;
   int rv;
-  ssize_t len;
+  nghttp2_ssize len;
   const uint8_t *data;
   static const uint8_t nghttp2[] = "https://nghttp2.org";
   static const uint8_t examples[] = "https://examples.com";
@@ -6792,27 +7024,27 @@ void test_nghttp2_submit_origin(void) {
 
   rv = nghttp2_submit_origin(session, NGHTTP2_FLAG_NONE, ov, 2);
 
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   ud.frame_send_cb_called = 0;
-  len = nghttp2_session_mem_send(session, &data);
+  len = nghttp2_session_mem_send2(session, &data);
 
-  CU_ASSERT(len > 0);
-  CU_ASSERT(1 == ud.frame_send_cb_called);
+  assert_ptrdiff(0, <, len);
+  assert_int(1, ==, ud.frame_send_cb_called);
 
   nghttp2_frame_unpack_frame_hd(&frame.hd, data);
   rv = nghttp2_frame_unpack_origin_payload(
       &frame.ext, data + NGHTTP2_FRAME_HDLEN, (size_t)len - NGHTTP2_FRAME_HDLEN,
       mem);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(0 == frame.hd.stream_id);
-  CU_ASSERT(NGHTTP2_ORIGIN == frame.hd.type);
-  CU_ASSERT(2 == origin.nov);
-  CU_ASSERT(0 == memcmp(nghttp2, origin.ov[0].origin, sizeof(nghttp2) - 1));
-  CU_ASSERT(sizeof(nghttp2) - 1 == origin.ov[0].origin_len);
-  CU_ASSERT(0 == memcmp(examples, origin.ov[1].origin, sizeof(examples) - 1));
-  CU_ASSERT(sizeof(examples) - 1 == origin.ov[1].origin_len);
+  assert_int(0, ==, rv);
+  assert_int32(0, ==, frame.hd.stream_id);
+  assert_uint8(NGHTTP2_ORIGIN, ==, frame.hd.type);
+  assert_size(2, ==, origin.nov);
+  assert_memory_equal(sizeof(nghttp2) - 1, nghttp2, origin.ov[0].origin);
+  assert_size(sizeof(nghttp2) - 1, ==, origin.ov[0].origin_len);
+  assert_memory_equal(sizeof(examples) - 1, examples, origin.ov[1].origin);
+  assert_size(sizeof(examples) - 1, ==, origin.ov[1].origin_len);
 
   nghttp2_frame_origin_free(&frame.ext, mem);
 
@@ -6823,7 +7055,7 @@ void test_nghttp2_submit_origin(void) {
 
   rv = nghttp2_submit_origin(session, NGHTTP2_FLAG_NONE, ov, 1);
 
-  CU_ASSERT(NGHTTP2_ERR_INVALID_STATE == rv);
+  assert_int(NGHTTP2_ERR_INVALID_STATE, ==, rv);
 
   nghttp2_session_del(session);
 
@@ -6832,17 +7064,17 @@ void test_nghttp2_submit_origin(void) {
 
   rv = nghttp2_submit_origin(session, NGHTTP2_FLAG_NONE, NULL, 0);
 
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   ud.frame_send_cb_called = 0;
-  len = nghttp2_session_mem_send(session, &data);
+  len = nghttp2_session_mem_send2(session, &data);
 
-  CU_ASSERT(len == NGHTTP2_FRAME_HDLEN);
-  CU_ASSERT(1 == ud.frame_send_cb_called);
+  assert_ptrdiff(NGHTTP2_FRAME_HDLEN, ==, len);
+  assert_int(1, ==, ud.frame_send_cb_called);
 
   nghttp2_frame_unpack_frame_hd(&frame.hd, data);
 
-  CU_ASSERT(NGHTTP2_ORIGIN == frame.hd.type);
+  assert_uint8(NGHTTP2_ORIGIN, ==, frame.hd.type);
 
   nghttp2_session_del(session);
 }
@@ -6856,7 +7088,7 @@ void test_nghttp2_submit_priority_update(void) {
   int rv;
   nghttp2_frame frame;
   nghttp2_ext_priority_update priority_update;
-  ssize_t len;
+  nghttp2_ssize len;
   int32_t stream_id;
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
@@ -6867,38 +7099,38 @@ void test_nghttp2_submit_priority_update(void) {
   session->pending_no_rfc7540_priorities = 1;
 
   stream_id =
-      nghttp2_submit_request(session, NULL, reqnv, ARRLEN(reqnv), NULL, NULL);
+      nghttp2_submit_request2(session, NULL, reqnv, ARRLEN(reqnv), NULL, NULL);
 
-  CU_ASSERT(1 == stream_id);
+  assert_int32(1, ==, stream_id);
 
-  len = nghttp2_session_mem_send(session, &data);
+  len = nghttp2_session_mem_send2(session, &data);
 
-  CU_ASSERT(len > 0);
+  assert_ptrdiff(0, <, len);
 
   rv = nghttp2_submit_priority_update(session, NGHTTP2_FLAG_NONE, stream_id,
                                       field_value, sizeof(field_value) - 1);
 
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   frame.ext.payload = &priority_update;
 
   ud.frame_send_cb_called = 0;
-  len = nghttp2_session_mem_send(session, &data);
+  len = nghttp2_session_mem_send2(session, &data);
 
-  CU_ASSERT(len > 0);
-  CU_ASSERT(1 == ud.frame_send_cb_called);
+  assert_ptrdiff(0, <, len);
+  assert_int(1, ==, ud.frame_send_cb_called);
 
   nghttp2_frame_unpack_frame_hd(&frame.hd, data);
   nghttp2_frame_unpack_priority_update_payload(
       &frame.ext, (uint8_t *)(data + NGHTTP2_FRAME_HDLEN),
       (size_t)len - NGHTTP2_FRAME_HDLEN);
 
-  CU_ASSERT(0 == frame.hd.stream_id);
-  CU_ASSERT(NGHTTP2_PRIORITY_UPDATE == frame.hd.type);
-  CU_ASSERT(stream_id == priority_update.stream_id);
-  CU_ASSERT(sizeof(field_value) - 1 == priority_update.field_value_len);
-  CU_ASSERT(0 == memcmp(field_value, priority_update.field_value,
-                        sizeof(field_value) - 1));
+  assert_int32(0, ==, frame.hd.stream_id);
+  assert_uint8(NGHTTP2_PRIORITY_UPDATE, ==, frame.hd.type);
+  assert_int32(stream_id, ==, priority_update.stream_id);
+  assert_size(sizeof(field_value) - 1, ==, priority_update.field_value_len);
+  assert_memory_equal(sizeof(field_value) - 1, field_value,
+                      priority_update.field_value);
 
   nghttp2_session_del(session);
 
@@ -6910,7 +7142,7 @@ void test_nghttp2_submit_priority_update(void) {
   rv = nghttp2_submit_priority_update(session, NGHTTP2_FLAG_NONE, 1,
                                       field_value, sizeof(field_value) - 1);
 
-  CU_ASSERT(NGHTTP2_ERR_INVALID_STATE == rv);
+  assert_int(NGHTTP2_ERR_INVALID_STATE, ==, rv);
 
   nghttp2_session_del(session);
 
@@ -6918,35 +7150,35 @@ void test_nghttp2_submit_priority_update(void) {
   nghttp2_session_client_new(&session, &callbacks, &ud);
 
   stream_id =
-      nghttp2_submit_request(session, NULL, reqnv, ARRLEN(reqnv), NULL, NULL);
+      nghttp2_submit_request2(session, NULL, reqnv, ARRLEN(reqnv), NULL, NULL);
 
-  CU_ASSERT(1 == stream_id);
+  assert_int32(1, ==, stream_id);
 
-  len = nghttp2_session_mem_send(session, &data);
+  len = nghttp2_session_mem_send2(session, &data);
 
-  CU_ASSERT(len > 0);
+  assert_ptrdiff(0, <, len);
 
   rv = nghttp2_submit_priority_update(session, NGHTTP2_FLAG_NONE, stream_id,
                                       NULL, 0);
 
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   frame.ext.payload = &priority_update;
 
-  len = nghttp2_session_mem_send(session, &data);
+  len = nghttp2_session_mem_send2(session, &data);
 
-  CU_ASSERT(len > 0);
+  assert_ptrdiff(0, <, len);
 
   nghttp2_frame_unpack_frame_hd(&frame.hd, data);
   nghttp2_frame_unpack_priority_update_payload(
       &frame.ext, (uint8_t *)(data + NGHTTP2_FRAME_HDLEN),
       (size_t)len - NGHTTP2_FRAME_HDLEN);
 
-  CU_ASSERT(0 == frame.hd.stream_id);
-  CU_ASSERT(NGHTTP2_PRIORITY_UPDATE == frame.hd.type);
-  CU_ASSERT(stream_id == priority_update.stream_id);
-  CU_ASSERT(0 == priority_update.field_value_len);
-  CU_ASSERT(NULL == priority_update.field_value);
+  assert_int32(0, ==, frame.hd.stream_id);
+  assert_uint8(NGHTTP2_PRIORITY_UPDATE, ==, frame.hd.type);
+  assert_int32(stream_id, ==, priority_update.stream_id);
+  assert_size(0, ==, priority_update.field_value_len);
+  assert_null(priority_update.field_value);
 
   nghttp2_session_del(session);
 }
@@ -6966,11 +7198,11 @@ void test_nghttp2_submit_rst_stream(void) {
   rv = nghttp2_submit_rst_stream(session, NGHTTP2_FLAG_NONE, 1,
                                  NGHTTP2_NO_ERROR);
 
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   item = nghttp2_outbound_queue_top(&session->ob_reg);
 
-  CU_ASSERT(NULL == item);
+  assert_null(item);
 
   nghttp2_session_del(session);
 
@@ -6980,11 +7212,11 @@ void test_nghttp2_submit_rst_stream(void) {
   rv = nghttp2_submit_rst_stream(session, NGHTTP2_FLAG_NONE, 2,
                                  NGHTTP2_NO_ERROR);
 
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   item = nghttp2_outbound_queue_top(&session->ob_reg);
 
-  CU_ASSERT(NULL == item);
+  assert_null(item);
 
   nghttp2_session_del(session);
 
@@ -6996,13 +7228,13 @@ void test_nghttp2_submit_rst_stream(void) {
   rv = nghttp2_submit_rst_stream(session, NGHTTP2_FLAG_NONE, 1,
                                  NGHTTP2_NO_ERROR);
 
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   item = nghttp2_outbound_queue_top(&session->ob_reg);
 
-  CU_ASSERT(NULL != item);
-  CU_ASSERT(NGHTTP2_RST_STREAM == item->frame.hd.type);
-  CU_ASSERT(1 == item->frame.hd.stream_id);
+  assert_not_null(item);
+  assert_uint8(NGHTTP2_RST_STREAM, ==, item->frame.hd.type);
+  assert_int32(1, ==, item->frame.hd.stream_id);
 
   nghttp2_session_del(session);
 
@@ -7014,13 +7246,13 @@ void test_nghttp2_submit_rst_stream(void) {
   rv = nghttp2_submit_rst_stream(session, NGHTTP2_FLAG_NONE, 2,
                                  NGHTTP2_NO_ERROR);
 
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   item = nghttp2_outbound_queue_top(&session->ob_reg);
 
-  CU_ASSERT(NULL != item);
-  CU_ASSERT(NGHTTP2_RST_STREAM == item->frame.hd.type);
-  CU_ASSERT(2 == item->frame.hd.stream_id);
+  assert_not_null(item);
+  assert_uint8(NGHTTP2_RST_STREAM, ==, item->frame.hd.type);
+  assert_int32(2, ==, item->frame.hd.stream_id);
 
   nghttp2_session_del(session);
 
@@ -7028,26 +7260,26 @@ void test_nghttp2_submit_rst_stream(void) {
   nghttp2_session_client_new(&session, &callbacks, NULL);
 
   stream_id =
-      nghttp2_submit_request(session, NULL, reqnv, ARRLEN(reqnv), NULL, NULL);
+      nghttp2_submit_request2(session, NULL, reqnv, ARRLEN(reqnv), NULL, NULL);
 
-  CU_ASSERT(stream_id > 0);
+  assert_int32(0, <, stream_id);
 
   item = nghttp2_outbound_queue_top(&session->ob_syn);
 
-  CU_ASSERT(NULL != item);
-  CU_ASSERT(NGHTTP2_HEADERS == item->frame.hd.type);
-  CU_ASSERT(0 == item->aux_data.headers.canceled);
+  assert_not_null(item);
+  assert_uint8(NGHTTP2_HEADERS, ==, item->frame.hd.type);
+  assert_false(item->aux_data.headers.canceled);
 
   rv = nghttp2_submit_rst_stream(session, NGHTTP2_FLAG_NONE, stream_id,
                                  NGHTTP2_NO_ERROR);
 
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   item = nghttp2_outbound_queue_top(&session->ob_syn);
 
-  CU_ASSERT(NULL != item);
-  CU_ASSERT(NGHTTP2_HEADERS == item->frame.hd.type);
-  CU_ASSERT(1 == item->aux_data.headers.canceled);
+  assert_not_null(item);
+  assert_uint8(NGHTTP2_HEADERS, ==, item->frame.hd.type);
+  assert_true(item->aux_data.headers.canceled);
 
   nghttp2_session_del(session);
 }
@@ -7065,50 +7297,50 @@ void test_nghttp2_session_open_stream(void) {
 
   stream = nghttp2_session_open_stream(session, 1, NGHTTP2_STREAM_FLAG_NONE,
                                        &pri_spec, NGHTTP2_STREAM_OPENED, NULL);
-  CU_ASSERT(1 == session->num_incoming_streams);
-  CU_ASSERT(0 == session->num_outgoing_streams);
-  CU_ASSERT(NGHTTP2_STREAM_OPENED == stream->state);
-  CU_ASSERT(245 == stream->weight);
-  CU_ASSERT(&session->root == stream->dep_prev);
-  CU_ASSERT(NGHTTP2_SHUT_NONE == stream->shut_flags);
+  assert_size(1, ==, session->num_incoming_streams);
+  assert_size(0, ==, session->num_outgoing_streams);
+  assert_enum(nghttp2_stream_state, NGHTTP2_STREAM_OPENED, ==, stream->state);
+  assert_int32(245, ==, stream->weight);
+  assert_ptr_equal(&session->root, stream->dep_prev);
+  assert_uint8(NGHTTP2_SHUT_NONE, ==, stream->shut_flags);
 
   stream = nghttp2_session_open_stream(session, 2, NGHTTP2_STREAM_FLAG_NONE,
                                        &pri_spec_default,
                                        NGHTTP2_STREAM_OPENING, NULL);
-  CU_ASSERT(1 == session->num_incoming_streams);
-  CU_ASSERT(1 == session->num_outgoing_streams);
-  CU_ASSERT(&session->root == stream->dep_prev);
-  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT == stream->weight);
-  CU_ASSERT(NGHTTP2_SHUT_NONE == stream->shut_flags);
+  assert_size(1, ==, session->num_incoming_streams);
+  assert_size(1, ==, session->num_outgoing_streams);
+  assert_ptr_equal(&session->root, stream->dep_prev);
+  assert_int32(NGHTTP2_DEFAULT_WEIGHT, ==, stream->weight);
+  assert_uint8(NGHTTP2_SHUT_NONE, ==, stream->shut_flags);
 
   stream = nghttp2_session_open_stream(session, 4, NGHTTP2_STREAM_FLAG_NONE,
                                        &pri_spec_default,
                                        NGHTTP2_STREAM_RESERVED, NULL);
-  CU_ASSERT(1 == session->num_incoming_streams);
-  CU_ASSERT(1 == session->num_outgoing_streams);
-  CU_ASSERT(&session->root == stream->dep_prev);
-  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT == stream->weight);
-  CU_ASSERT(NGHTTP2_SHUT_RD == stream->shut_flags);
+  assert_size(1, ==, session->num_incoming_streams);
+  assert_size(1, ==, session->num_outgoing_streams);
+  assert_ptr_equal(&session->root, stream->dep_prev);
+  assert_int32(NGHTTP2_DEFAULT_WEIGHT, ==, stream->weight);
+  assert_uint8(NGHTTP2_SHUT_RD, ==, stream->shut_flags);
 
   nghttp2_priority_spec_init(&pri_spec, 1, 17, 1);
 
   stream = nghttp2_session_open_stream(session, 3, NGHTTP2_STREAM_FLAG_NONE,
                                        &pri_spec, NGHTTP2_STREAM_OPENED, NULL);
-  CU_ASSERT(17 == stream->weight);
-  CU_ASSERT(1 == stream->dep_prev->stream_id);
+  assert_int32(17, ==, stream->weight);
+  assert_int32(1, ==, stream->dep_prev->stream_id);
 
   /* Dependency to idle stream */
   nghttp2_priority_spec_init(&pri_spec, 1000000007, 240, 1);
 
   stream = nghttp2_session_open_stream(session, 5, NGHTTP2_STREAM_FLAG_NONE,
                                        &pri_spec, NGHTTP2_STREAM_OPENED, NULL);
-  CU_ASSERT(240 == stream->weight);
-  CU_ASSERT(1000000007 == stream->dep_prev->stream_id);
+  assert_int32(240, ==, stream->weight);
+  assert_int32(1000000007, ==, stream->dep_prev->stream_id);
 
   stream = nghttp2_session_get_stream_raw(session, 1000000007);
 
-  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT == stream->weight);
-  CU_ASSERT(&session->root == stream->dep_prev);
+  assert_int32(NGHTTP2_DEFAULT_WEIGHT, ==, stream->weight);
+  assert_ptr_equal(&session->root, stream->dep_prev);
 
   /* Dependency to closed stream which is not in dependency tree */
   session->last_recv_stream_id = 7;
@@ -7118,8 +7350,8 @@ void test_nghttp2_session_open_stream(void) {
   stream = nghttp2_session_open_stream(session, 9, NGHTTP2_FLAG_NONE, &pri_spec,
                                        NGHTTP2_STREAM_OPENED, NULL);
 
-  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT == stream->weight);
-  CU_ASSERT(&session->root == stream->dep_prev);
+  assert_int32(NGHTTP2_DEFAULT_WEIGHT, ==, stream->weight);
+  assert_ptr_equal(&session->root, stream->dep_prev);
 
   nghttp2_session_del(session);
 
@@ -7127,11 +7359,11 @@ void test_nghttp2_session_open_stream(void) {
   stream = nghttp2_session_open_stream(session, 4, NGHTTP2_STREAM_FLAG_NONE,
                                        &pri_spec_default,
                                        NGHTTP2_STREAM_RESERVED, NULL);
-  CU_ASSERT(0 == session->num_incoming_streams);
-  CU_ASSERT(0 == session->num_outgoing_streams);
-  CU_ASSERT(&session->root == stream->dep_prev);
-  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT == stream->weight);
-  CU_ASSERT(NGHTTP2_SHUT_WR == stream->shut_flags);
+  assert_size(0, ==, session->num_incoming_streams);
+  assert_size(0, ==, session->num_outgoing_streams);
+  assert_ptr_equal(&session->root, stream->dep_prev);
+  assert_int32(NGHTTP2_DEFAULT_WEIGHT, ==, stream->weight);
+  assert_uint8(NGHTTP2_SHUT_WR, ==, stream->shut_flags);
 
   nghttp2_session_del(session);
 }
@@ -7151,13 +7383,13 @@ void test_nghttp2_session_open_stream_with_idle_stream_dep(void) {
   stream = nghttp2_session_open_stream(session, 1, NGHTTP2_STREAM_FLAG_NONE,
                                        &pri_spec, NGHTTP2_STREAM_OPENED, NULL);
 
-  CU_ASSERT(245 == stream->weight);
-  CU_ASSERT(101 == stream->dep_prev->stream_id);
+  assert_int32(245, ==, stream->weight);
+  assert_int32(101, ==, stream->dep_prev->stream_id);
 
   stream = nghttp2_session_get_stream_raw(session, 101);
 
-  CU_ASSERT(NGHTTP2_STREAM_IDLE == stream->state);
-  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT == stream->weight);
+  assert_enum(nghttp2_stream_state, NGHTTP2_STREAM_IDLE, ==, stream->state);
+  assert_int32(NGHTTP2_DEFAULT_WEIGHT, ==, stream->weight);
 
   nghttp2_priority_spec_init(&pri_spec, 211, 1, 0);
 
@@ -7165,13 +7397,13 @@ void test_nghttp2_session_open_stream_with_idle_stream_dep(void) {
   stream = nghttp2_session_open_stream(session, 101, NGHTTP2_STREAM_FLAG_NONE,
                                        &pri_spec, NGHTTP2_STREAM_OPENED, NULL);
 
-  CU_ASSERT(1 == stream->weight);
-  CU_ASSERT(211 == stream->dep_prev->stream_id);
+  assert_int32(1, ==, stream->weight);
+  assert_int32(211, ==, stream->dep_prev->stream_id);
 
   stream = nghttp2_session_get_stream_raw(session, 211);
 
-  CU_ASSERT(NGHTTP2_STREAM_IDLE == stream->state);
-  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT == stream->weight);
+  assert_enum(nghttp2_stream_state, NGHTTP2_STREAM_IDLE, ==, stream->state);
+  assert_int32(NGHTTP2_DEFAULT_WEIGHT, ==, stream->weight);
 
   nghttp2_session_del(session);
 }
@@ -7182,22 +7414,23 @@ void test_nghttp2_session_get_next_ob_item(void) {
   nghttp2_priority_spec pri_spec;
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   nghttp2_session_client_new(&session, &callbacks, NULL);
   session->remote_settings.max_concurrent_streams = 2;
 
-  CU_ASSERT(NULL == nghttp2_session_get_next_ob_item(session));
+  assert_null(nghttp2_session_get_next_ob_item(session));
   nghttp2_submit_ping(session, NGHTTP2_FLAG_NONE, NULL);
-  CU_ASSERT(NGHTTP2_PING ==
-            nghttp2_session_get_next_ob_item(session)->frame.hd.type);
+  assert_uint8(NGHTTP2_PING, ==,
+               nghttp2_session_get_next_ob_item(session)->frame.hd.type);
 
-  CU_ASSERT(1 == nghttp2_submit_request(session, NULL, NULL, 0, NULL, NULL));
-  CU_ASSERT(NGHTTP2_PING ==
-            nghttp2_session_get_next_ob_item(session)->frame.hd.type);
+  assert_int32(1, ==,
+               nghttp2_submit_request2(session, NULL, NULL, 0, NULL, NULL));
+  assert_uint8(NGHTTP2_PING, ==,
+               nghttp2_session_get_next_ob_item(session)->frame.hd.type);
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(NULL == nghttp2_session_get_next_ob_item(session));
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_null(nghttp2_session_get_next_ob_item(session));
 
   /* Incoming stream does not affect the number of outgoing max
      concurrent streams. */
@@ -7205,20 +7438,20 @@ void test_nghttp2_session_get_next_ob_item(void) {
 
   nghttp2_priority_spec_init(&pri_spec, 0, NGHTTP2_MAX_WEIGHT, 0);
 
-  CU_ASSERT(3 ==
-            nghttp2_submit_request(session, &pri_spec, NULL, 0, NULL, NULL));
-  CU_ASSERT(NGHTTP2_HEADERS ==
-            nghttp2_session_get_next_ob_item(session)->frame.hd.type);
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(3, ==,
+             nghttp2_submit_request2(session, &pri_spec, NULL, 0, NULL, NULL));
+  assert_uint8(NGHTTP2_HEADERS, ==,
+               nghttp2_session_get_next_ob_item(session)->frame.hd.type);
+  assert_int(0, ==, nghttp2_session_send(session));
 
-  CU_ASSERT(5 ==
-            nghttp2_submit_request(session, &pri_spec, NULL, 0, NULL, NULL));
-  CU_ASSERT(NULL == nghttp2_session_get_next_ob_item(session));
+  assert_int(5, ==,
+             nghttp2_submit_request2(session, &pri_spec, NULL, 0, NULL, NULL));
+  assert_null(nghttp2_session_get_next_ob_item(session));
 
   session->remote_settings.max_concurrent_streams = 3;
 
-  CU_ASSERT(NGHTTP2_HEADERS ==
-            nghttp2_session_get_next_ob_item(session)->frame.hd.type);
+  assert_uint8(NGHTTP2_HEADERS, ==,
+               nghttp2_session_get_next_ob_item(session)->frame.hd.type);
 
   nghttp2_session_del(session);
 
@@ -7226,10 +7459,11 @@ void test_nghttp2_session_get_next_ob_item(void) {
   nghttp2_session_server_new(&session, &callbacks, NULL);
   session->remote_settings.max_concurrent_streams = 0;
   open_sent_stream2(session, 2, NGHTTP2_STREAM_RESERVED);
-  CU_ASSERT(0 == nghttp2_submit_headers(session, NGHTTP2_FLAG_END_STREAM, 2,
-                                        NULL, NULL, 0, NULL));
-  CU_ASSERT(NULL == nghttp2_session_get_next_ob_item(session));
-  CU_ASSERT(1 == nghttp2_outbound_queue_size(&session->ob_syn));
+  assert_int32(0, ==,
+               nghttp2_submit_headers(session, NGHTTP2_FLAG_END_STREAM, 2, NULL,
+                                      NULL, 0, NULL));
+  assert_null(nghttp2_session_get_next_ob_item(session));
+  assert_size(1, ==, nghttp2_outbound_queue_size(&session->ob_syn));
   nghttp2_session_del(session);
 }
 
@@ -7242,30 +7476,30 @@ void test_nghttp2_session_pop_next_ob_item(void) {
 
   mem = nghttp2_mem_default();
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   nghttp2_session_client_new(&session, &callbacks, NULL);
   session->remote_settings.max_concurrent_streams = 1;
 
-  CU_ASSERT(NULL == nghttp2_session_pop_next_ob_item(session));
+  assert_null(nghttp2_session_pop_next_ob_item(session));
 
   nghttp2_submit_ping(session, NGHTTP2_FLAG_NONE, NULL);
 
   nghttp2_priority_spec_init(&pri_spec, 0, 254, 0);
 
-  nghttp2_submit_request(session, &pri_spec, NULL, 0, NULL, NULL);
+  nghttp2_submit_request2(session, &pri_spec, NULL, 0, NULL, NULL);
 
   item = nghttp2_session_pop_next_ob_item(session);
-  CU_ASSERT(NGHTTP2_PING == item->frame.hd.type);
+  assert_uint8(NGHTTP2_PING, ==, item->frame.hd.type);
   nghttp2_outbound_item_free(item, mem);
   mem->free(item, NULL);
 
   item = nghttp2_session_pop_next_ob_item(session);
-  CU_ASSERT(NGHTTP2_HEADERS == item->frame.hd.type);
+  assert_uint8(NGHTTP2_HEADERS, ==, item->frame.hd.type);
   nghttp2_outbound_item_free(item, mem);
   mem->free(item, NULL);
 
-  CU_ASSERT(NULL == nghttp2_session_pop_next_ob_item(session));
+  assert_null(nghttp2_session_pop_next_ob_item(session));
 
   /* Incoming stream does not affect the number of outgoing max
      concurrent streams. */
@@ -7275,14 +7509,14 @@ void test_nghttp2_session_pop_next_ob_item(void) {
 
   nghttp2_priority_spec_init(&pri_spec, 0, NGHTTP2_MAX_WEIGHT, 0);
 
-  nghttp2_submit_request(session, &pri_spec, NULL, 0, NULL, NULL);
+  nghttp2_submit_request2(session, &pri_spec, NULL, 0, NULL, NULL);
 
-  CU_ASSERT(NULL == nghttp2_session_pop_next_ob_item(session));
+  assert_null(nghttp2_session_pop_next_ob_item(session));
 
   session->remote_settings.max_concurrent_streams = 2;
 
   item = nghttp2_session_pop_next_ob_item(session);
-  CU_ASSERT(NGHTTP2_HEADERS == item->frame.hd.type);
+  assert_uint8(NGHTTP2_HEADERS, ==, item->frame.hd.type);
   nghttp2_outbound_item_free(item, mem);
   mem->free(item, NULL);
 
@@ -7292,28 +7526,29 @@ void test_nghttp2_session_pop_next_ob_item(void) {
   nghttp2_session_server_new(&session, &callbacks, NULL);
   session->remote_settings.max_concurrent_streams = 0;
   open_sent_stream2(session, 2, NGHTTP2_STREAM_RESERVED);
-  CU_ASSERT(0 == nghttp2_submit_headers(session, NGHTTP2_FLAG_END_STREAM, 2,
-                                        NULL, NULL, 0, NULL));
-  CU_ASSERT(NULL == nghttp2_session_pop_next_ob_item(session));
-  CU_ASSERT(1 == nghttp2_outbound_queue_size(&session->ob_syn));
+  assert_int32(0, ==,
+               nghttp2_submit_headers(session, NGHTTP2_FLAG_END_STREAM, 2, NULL,
+                                      NULL, 0, NULL));
+  assert_null(nghttp2_session_pop_next_ob_item(session));
+  assert_size(1, ==, nghttp2_outbound_queue_size(&session->ob_syn));
   nghttp2_session_del(session);
 }
 
 void test_nghttp2_session_reply_fail(void) {
   nghttp2_session *session;
   nghttp2_session_callbacks callbacks;
-  nghttp2_data_provider data_prd;
+  nghttp2_data_provider2 data_prd;
   my_user_data ud;
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = fail_send_callback;
+  callbacks.send_callback2 = fail_send_callback;
 
   data_prd.read_callback = fixed_length_data_source_read_callback;
   ud.data_source_length = 4 * 1024;
-  CU_ASSERT(0 == nghttp2_session_server_new(&session, &callbacks, &ud));
+  assert_int(0, ==, nghttp2_session_server_new(&session, &callbacks, &ud));
   open_recv_stream2(session, 1, NGHTTP2_STREAM_OPENING);
-  CU_ASSERT(0 == nghttp2_submit_response(session, 1, NULL, 0, &data_prd));
-  CU_ASSERT(NGHTTP2_ERR_CALLBACK_FAILURE == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_submit_response2(session, 1, NULL, 0, &data_prd));
+  assert_int(NGHTTP2_ERR_CALLBACK_FAILURE, ==, nghttp2_session_send(session));
   nghttp2_session_del(session);
 }
 
@@ -7326,7 +7561,7 @@ void test_nghttp2_session_max_concurrent_streams(void) {
 
   mem = nghttp2_mem_default();
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   nghttp2_session_server_new(&session, &callbacks, NULL);
   open_recv_stream(session, 1);
@@ -7336,25 +7571,25 @@ void test_nghttp2_session_max_concurrent_streams(void) {
                              NGHTTP2_HCAT_HEADERS, NULL, NULL, 0);
   session->pending_local_max_concurrent_stream = 1;
 
-  CU_ASSERT(NGHTTP2_ERR_IGN_HEADER_BLOCK ==
-            nghttp2_session_on_request_headers_received(session, &frame));
+  assert_int(NGHTTP2_ERR_IGN_HEADER_BLOCK, ==,
+             nghttp2_session_on_request_headers_received(session, &frame));
 
   item = nghttp2_outbound_queue_top(&session->ob_reg);
-  CU_ASSERT(NGHTTP2_RST_STREAM == item->frame.hd.type);
-  CU_ASSERT(NGHTTP2_REFUSED_STREAM == item->frame.rst_stream.error_code);
+  assert_uint8(NGHTTP2_RST_STREAM, ==, item->frame.hd.type);
+  assert_uint32(NGHTTP2_REFUSED_STREAM, ==, item->frame.rst_stream.error_code);
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
 
   /* Check ACKed SETTINGS_MAX_CONCURRENT_STREAMS */
   session->local_settings.max_concurrent_streams = 1;
   frame.hd.stream_id = 5;
 
-  CU_ASSERT(NGHTTP2_ERR_IGN_HEADER_BLOCK ==
-            nghttp2_session_on_request_headers_received(session, &frame));
+  assert_int(NGHTTP2_ERR_IGN_HEADER_BLOCK, ==,
+             nghttp2_session_on_request_headers_received(session, &frame));
 
   item = nghttp2_outbound_queue_top(&session->ob_reg);
-  CU_ASSERT(NGHTTP2_GOAWAY == item->frame.hd.type);
-  CU_ASSERT(NGHTTP2_PROTOCOL_ERROR == item->frame.goaway.error_code);
+  assert_uint8(NGHTTP2_GOAWAY, ==, item->frame.hd.type);
+  assert_uint32(NGHTTP2_PROTOCOL_ERROR, ==, item->frame.goaway.error_code);
 
   nghttp2_frame_headers_free(&frame.headers, mem);
   nghttp2_session_del(session);
@@ -7364,12 +7599,12 @@ void test_nghttp2_session_stop_data_with_rst_stream(void) {
   nghttp2_session *session;
   nghttp2_session_callbacks callbacks;
   my_user_data ud;
-  nghttp2_data_provider data_prd;
+  nghttp2_data_provider2 data_prd;
   nghttp2_frame frame;
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
   callbacks.on_frame_send_callback = on_frame_send_callback;
-  callbacks.send_callback = block_count_send_callback;
+  callbacks.send_callback2 = block_count_send_callback;
   data_prd.read_callback = fixed_length_data_source_read_callback;
 
   ud.frame_send_cb_called = 0;
@@ -7377,28 +7612,28 @@ void test_nghttp2_session_stop_data_with_rst_stream(void) {
 
   nghttp2_session_server_new(&session, &callbacks, &ud);
   open_recv_stream2(session, 1, NGHTTP2_STREAM_OPENING);
-  nghttp2_submit_response(session, 1, NULL, 0, &data_prd);
+  nghttp2_submit_response2(session, 1, NULL, 0, &data_prd);
 
   ud.block_count = 2;
   /* Sends response HEADERS + DATA[0] */
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(NGHTTP2_DATA == ud.sent_frame_type);
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_uint8(NGHTTP2_DATA, ==, ud.sent_frame_type);
   /* data for DATA[1] is read from data_prd but it is not sent */
-  CU_ASSERT(ud.data_source_length == NGHTTP2_DATA_PAYLOADLEN * 2);
+  assert_size(ud.data_source_length, ==, NGHTTP2_DATA_PAYLOADLEN * 2);
 
   nghttp2_frame_rst_stream_init(&frame.rst_stream, 1, NGHTTP2_CANCEL);
-  CU_ASSERT(0 == nghttp2_session_on_rst_stream_received(session, &frame));
+  assert_int(0, ==, nghttp2_session_on_rst_stream_received(session, &frame));
   nghttp2_frame_rst_stream_free(&frame.rst_stream);
 
   /* Big enough number to send all DATA frames potentially. */
   ud.block_count = 100;
   /* Nothing will be sent in the following call. */
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
   /* With RST_STREAM, stream is canceled and further DATA on that
      stream are not sent. */
-  CU_ASSERT(ud.data_source_length == NGHTTP2_DATA_PAYLOADLEN * 2);
+  assert_size(ud.data_source_length, ==, NGHTTP2_DATA_PAYLOADLEN * 2);
 
-  CU_ASSERT(NULL == nghttp2_session_get_stream(session, 1));
+  assert_null(nghttp2_session_get_stream(session, 1));
 
   nghttp2_session_del(session);
 }
@@ -7407,13 +7642,13 @@ void test_nghttp2_session_defer_data(void) {
   nghttp2_session *session;
   nghttp2_session_callbacks callbacks;
   my_user_data ud;
-  nghttp2_data_provider data_prd;
+  nghttp2_data_provider2 data_prd;
   nghttp2_outbound_item *item;
   nghttp2_stream *stream;
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
   callbacks.on_frame_send_callback = on_frame_send_callback;
-  callbacks.send_callback = block_count_send_callback;
+  callbacks.send_callback2 = block_count_send_callback;
   data_prd.read_callback = defer_data_source_read_callback;
 
   ud.frame_send_cb_called = 0;
@@ -7425,47 +7660,48 @@ void test_nghttp2_session_defer_data(void) {
   session->remote_window_size = 1 << 20;
   stream->remote_window_size = 1 << 20;
 
-  nghttp2_submit_response(session, 1, NULL, 0, &data_prd);
+  nghttp2_submit_response2(session, 1, NULL, 0, &data_prd);
 
   ud.block_count = 1;
   /* Sends HEADERS reply */
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(NGHTTP2_HEADERS == ud.sent_frame_type);
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_uint8(NGHTTP2_HEADERS, ==, ud.sent_frame_type);
   /* No data is read */
-  CU_ASSERT(ud.data_source_length == NGHTTP2_DATA_PAYLOADLEN * 4);
+  assert_size(ud.data_source_length, ==, NGHTTP2_DATA_PAYLOADLEN * 4);
 
   ud.block_count = 1;
   nghttp2_submit_ping(session, NGHTTP2_FLAG_NONE, NULL);
   /* Sends PING */
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(NGHTTP2_PING == ud.sent_frame_type);
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_uint8(NGHTTP2_PING, ==, ud.sent_frame_type);
 
   /* Resume deferred DATA */
-  CU_ASSERT(0 == nghttp2_session_resume_data(session, 1));
+  assert_int(0, ==, nghttp2_session_resume_data(session, 1));
   item = stream->item;
-  item->aux_data.data.data_prd.read_callback =
+  item->aux_data.data.dpw.data_prd.v1.read_callback =
       fixed_length_data_source_read_callback;
   ud.block_count = 1;
   /* Reads 2 DATA chunks */
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(ud.data_source_length == NGHTTP2_DATA_PAYLOADLEN * 2);
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_size(ud.data_source_length, ==, NGHTTP2_DATA_PAYLOADLEN * 2);
 
   /* Deferred again */
-  item->aux_data.data.data_prd.read_callback = defer_data_source_read_callback;
+  item->aux_data.data.dpw.data_prd.v1.read_callback =
+      defer_data_source_read_callback;
   /* This is needed since 16KiB block is already read and waiting to be
      sent. No read_callback invocation. */
   ud.block_count = 1;
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(ud.data_source_length == NGHTTP2_DATA_PAYLOADLEN * 2);
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_size(ud.data_source_length, ==, NGHTTP2_DATA_PAYLOADLEN * 2);
 
   /* Resume deferred DATA */
-  CU_ASSERT(0 == nghttp2_session_resume_data(session, 1));
-  item->aux_data.data.data_prd.read_callback =
+  assert_int(0, ==, nghttp2_session_resume_data(session, 1));
+  item->aux_data.data.dpw.data_prd.v1.read_callback =
       fixed_length_data_source_read_callback;
   ud.block_count = 1;
   /* Reads 2 16KiB blocks */
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(ud.data_source_length == 0);
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_size(ud.data_source_length, ==, 0);
 
   nghttp2_session_del(session);
 }
@@ -7474,7 +7710,7 @@ void test_nghttp2_session_flow_control(void) {
   nghttp2_session *session;
   nghttp2_session_callbacks callbacks;
   my_user_data ud;
-  nghttp2_data_provider data_prd;
+  nghttp2_data_provider2 data_prd;
   nghttp2_frame frame;
   nghttp2_stream *stream;
   int32_t new_initial_window_size;
@@ -7484,7 +7720,7 @@ void test_nghttp2_session_flow_control(void) {
 
   mem = nghttp2_mem_default();
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = fixed_bytes_send_callback;
+  callbacks.send_callback2 = fixed_bytes_send_callback;
   callbacks.on_frame_send_callback = on_frame_send_callback;
   data_prd.read_callback = fixed_length_data_source_read_callback;
 
@@ -7500,11 +7736,11 @@ void test_nghttp2_session_flow_control(void) {
   session->remote_window_size = 64 * 1024;
   session->remote_settings.initial_window_size = 64 * 1024;
 
-  nghttp2_submit_request(session, NULL, NULL, 0, &data_prd, NULL);
+  nghttp2_submit_request2(session, NULL, NULL, 0, &data_prd, NULL);
 
   /* Sends 64KiB - 1 data */
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(64 * 1024 == ud.data_source_length);
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_size(64 * 1024, ==, ud.data_source_length);
 
   /* Back 32KiB in stream window */
   nghttp2_frame_window_update_init(&frame.window_update, NGHTTP2_FLAG_NONE, 1,
@@ -7512,16 +7748,16 @@ void test_nghttp2_session_flow_control(void) {
   nghttp2_session_on_window_update_received(session, &frame);
 
   /* Send nothing because of connection-level window */
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(64 * 1024 == ud.data_source_length);
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_size(64 * 1024, ==, ud.data_source_length);
 
   /* Back 32KiB in connection-level window */
   frame.hd.stream_id = 0;
   nghttp2_session_on_window_update_received(session, &frame);
 
   /* Sends another 32KiB data */
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(32 * 1024 == ud.data_source_length);
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_size(32 * 1024, ==, ud.data_source_length);
 
   stream = nghttp2_session_get_stream(session, 1);
   /* Change initial window size to 16KiB. The window_size becomes
@@ -7533,7 +7769,7 @@ void test_nghttp2_session_flow_control(void) {
        stream->remote_window_size);
   session->remote_settings.initial_window_size =
       (uint32_t)new_initial_window_size;
-  CU_ASSERT(-48 * 1024 == stream->remote_window_size);
+  assert_int32(-48 * 1024, ==, stream->remote_window_size);
 
   /* Back 48KiB to stream window */
   frame.hd.stream_id = 1;
@@ -7541,8 +7777,8 @@ void test_nghttp2_session_flow_control(void) {
   nghttp2_session_on_window_update_received(session, &frame);
 
   /* Nothing is sent because window_size is 0 */
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(32 * 1024 == ud.data_source_length);
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_size(32 * 1024, ==, ud.data_source_length);
 
   /* Back 16KiB in stream window */
   frame.hd.stream_id = 1;
@@ -7555,8 +7791,8 @@ void test_nghttp2_session_flow_control(void) {
   nghttp2_session_on_window_update_received(session, &frame);
 
   /* Sends another 16KiB data */
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(16 * 1024 == ud.data_source_length);
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_size(16 * 1024, ==, ud.data_source_length);
 
   /* Increase initial window size to 32KiB */
   iv[0].settings_id = NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE;
@@ -7568,8 +7804,8 @@ void test_nghttp2_session_flow_control(void) {
   nghttp2_frame_settings_free(&settings_frame.settings, mem);
 
   /* Sends another 8KiB data */
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(8 * 1024 == ud.data_source_length);
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_size(8 * 1024, ==, ud.data_source_length);
 
   /* Back 8KiB in connection-level window */
   frame.hd.stream_id = 0;
@@ -7577,10 +7813,10 @@ void test_nghttp2_session_flow_control(void) {
   nghttp2_session_on_window_update_received(session, &frame);
 
   /* Sends last 8KiB data */
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(0 == ud.data_source_length);
-  CU_ASSERT(nghttp2_session_get_stream(session, 1)->shut_flags &
-            NGHTTP2_SHUT_WR);
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_size(0, ==, ud.data_source_length);
+  assert_true(nghttp2_session_get_stream(session, 1)->shut_flags &
+              NGHTTP2_SHUT_WR);
 
   nghttp2_frame_window_update_free(&frame.window_update);
   nghttp2_session_del(session);
@@ -7595,7 +7831,7 @@ void test_nghttp2_session_flow_control_data_recv(void) {
   nghttp2_stream *stream;
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   /* Initial window size to 64KiB - 1*/
   nghttp2_session_client_new(&session, &callbacks, NULL);
@@ -7613,34 +7849,36 @@ void test_nghttp2_session_flow_control_data_recv(void) {
                         NGHTTP2_FLAG_END_STREAM, 1);
 
   nghttp2_frame_pack_frame_hd(data, &hd);
-  CU_ASSERT(NGHTTP2_MAX_PAYLOADLEN + NGHTTP2_FRAME_HDLEN ==
-            nghttp2_session_mem_recv(
-                session, data, NGHTTP2_MAX_PAYLOADLEN + NGHTTP2_FRAME_HDLEN));
+  assert_ptrdiff(
+      NGHTTP2_MAX_PAYLOADLEN + NGHTTP2_FRAME_HDLEN, ==,
+      nghttp2_session_mem_recv2(session, data,
+                                NGHTTP2_MAX_PAYLOADLEN + NGHTTP2_FRAME_HDLEN));
 
   item = nghttp2_session_get_next_ob_item(session);
   /* Since this is the last frame, stream-level WINDOW_UPDATE is not
      issued, but connection-level is. */
-  CU_ASSERT(NGHTTP2_WINDOW_UPDATE == item->frame.hd.type);
-  CU_ASSERT(0 == item->frame.hd.stream_id);
-  CU_ASSERT(NGHTTP2_MAX_PAYLOADLEN ==
-            item->frame.window_update.window_size_increment);
+  assert_uint8(NGHTTP2_WINDOW_UPDATE, ==, item->frame.hd.type);
+  assert_int32(0, ==, item->frame.hd.stream_id);
+  assert_int32(NGHTTP2_MAX_PAYLOADLEN, ==,
+               item->frame.window_update.window_size_increment);
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
 
   /* Receive DATA for closed stream. They are still subject to under
      connection-level flow control, since this situation arises when
      RST_STREAM is issued by the remote, but the local side keeps
      sending DATA frames. Without calculating connection-level window,
      the subsequent flow control gets confused. */
-  CU_ASSERT(NGHTTP2_MAX_PAYLOADLEN + NGHTTP2_FRAME_HDLEN ==
-            nghttp2_session_mem_recv(
-                session, data, NGHTTP2_MAX_PAYLOADLEN + NGHTTP2_FRAME_HDLEN));
+  assert_ptrdiff(
+      NGHTTP2_MAX_PAYLOADLEN + NGHTTP2_FRAME_HDLEN, ==,
+      nghttp2_session_mem_recv2(session, data,
+                                NGHTTP2_MAX_PAYLOADLEN + NGHTTP2_FRAME_HDLEN));
 
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(NGHTTP2_WINDOW_UPDATE == item->frame.hd.type);
-  CU_ASSERT(0 == item->frame.hd.stream_id);
-  CU_ASSERT(NGHTTP2_MAX_PAYLOADLEN ==
-            item->frame.window_update.window_size_increment);
+  assert_uint8(NGHTTP2_WINDOW_UPDATE, ==, item->frame.hd.type);
+  assert_int32(0, ==, item->frame.hd.stream_id);
+  assert_int32(NGHTTP2_MAX_PAYLOADLEN, ==,
+               item->frame.window_update.window_size_increment);
 
   nghttp2_session_del(session);
 }
@@ -7654,7 +7892,7 @@ void test_nghttp2_session_flow_control_data_with_padding_recv(void) {
   nghttp2_option *option;
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   nghttp2_option_new(&option);
   /* Disable auto window update so that we can check padding is
@@ -7676,66 +7914,69 @@ void test_nghttp2_session_flow_control_data_with_padding_recv(void) {
   /* Set Pad Length field, which itself is padding */
   data[NGHTTP2_FRAME_HDLEN] = 255;
 
-  CU_ASSERT(
-      (ssize_t)(NGHTTP2_FRAME_HDLEN + hd.length) ==
-      nghttp2_session_mem_recv(session, data, NGHTTP2_FRAME_HDLEN + hd.length));
+  assert_ptrdiff((nghttp2_ssize)(NGHTTP2_FRAME_HDLEN + hd.length), ==,
+                 nghttp2_session_mem_recv2(session, data,
+                                           NGHTTP2_FRAME_HDLEN + hd.length));
 
-  CU_ASSERT((int32_t)hd.length == session->recv_window_size);
-  CU_ASSERT((int32_t)hd.length == stream->recv_window_size);
-  CU_ASSERT(256 == session->consumed_size);
-  CU_ASSERT(256 == stream->consumed_size);
-  CU_ASSERT(357 == session->recv_window_size);
-  CU_ASSERT(357 == stream->recv_window_size);
+  assert_int32((int32_t)hd.length, ==, session->recv_window_size);
+  assert_int32((int32_t)hd.length, ==, stream->recv_window_size);
+  assert_int32(256, ==, session->consumed_size);
+  assert_int32(256, ==, stream->consumed_size);
+  assert_int32(357, ==, session->recv_window_size);
+  assert_int32(357, ==, stream->recv_window_size);
 
   /* Receive the same DATA frame, but in 2 parts: first 9 + 1 + 102
      bytes which includes 1st padding byte, and remainder */
-  CU_ASSERT((ssize_t)(NGHTTP2_FRAME_HDLEN + 103) ==
-            nghttp2_session_mem_recv(session, data, NGHTTP2_FRAME_HDLEN + 103));
-  CU_ASSERT(258 == session->consumed_size);
-  CU_ASSERT(258 == stream->consumed_size);
-  CU_ASSERT(460 == session->recv_window_size);
-  CU_ASSERT(460 == stream->recv_window_size);
+  assert_ptrdiff(
+      (nghttp2_ssize)(NGHTTP2_FRAME_HDLEN + 103), ==,
+      nghttp2_session_mem_recv2(session, data, NGHTTP2_FRAME_HDLEN + 103));
+  assert_int32(258, ==, session->consumed_size);
+  assert_int32(258, ==, stream->consumed_size);
+  assert_int32(460, ==, session->recv_window_size);
+  assert_int32(460, ==, stream->recv_window_size);
 
   /* 357 - 103 = 254 bytes left */
-  CU_ASSERT(254 == nghttp2_session_mem_recv(session, data, 254));
-  CU_ASSERT(512 == session->consumed_size);
-  CU_ASSERT(512 == stream->consumed_size);
-  CU_ASSERT(714 == session->recv_window_size);
-  CU_ASSERT(714 == stream->recv_window_size);
+  assert_ptrdiff(254, ==, nghttp2_session_mem_recv2(session, data, 254));
+  assert_int32(512, ==, session->consumed_size);
+  assert_int32(512, ==, stream->consumed_size);
+  assert_int32(714, ==, session->recv_window_size);
+  assert_int32(714, ==, stream->recv_window_size);
 
   /* Receive the same DATA frame, but in 2 parts: first 9 = 1 + 101
      bytes which only includes data without padding, 2nd part is
      padding only */
-  CU_ASSERT((ssize_t)(NGHTTP2_FRAME_HDLEN + 102) ==
-            nghttp2_session_mem_recv(session, data, NGHTTP2_FRAME_HDLEN + 102));
-  CU_ASSERT(513 == session->consumed_size);
-  CU_ASSERT(513 == stream->consumed_size);
-  CU_ASSERT(816 == session->recv_window_size);
-  CU_ASSERT(816 == stream->recv_window_size);
+  assert_ptrdiff(
+      (nghttp2_ssize)(NGHTTP2_FRAME_HDLEN + 102), ==,
+      nghttp2_session_mem_recv2(session, data, NGHTTP2_FRAME_HDLEN + 102));
+  assert_int32(513, ==, session->consumed_size);
+  assert_int32(513, ==, stream->consumed_size);
+  assert_int32(816, ==, session->recv_window_size);
+  assert_int32(816, ==, stream->recv_window_size);
 
   /* 357 - 102 = 255 bytes left */
-  CU_ASSERT(255 == nghttp2_session_mem_recv(session, data, 255));
-  CU_ASSERT(768 == session->consumed_size);
-  CU_ASSERT(768 == stream->consumed_size);
-  CU_ASSERT(1071 == session->recv_window_size);
-  CU_ASSERT(1071 == stream->recv_window_size);
+  assert_ptrdiff(255, ==, nghttp2_session_mem_recv2(session, data, 255));
+  assert_int32(768, ==, session->consumed_size);
+  assert_int32(768, ==, stream->consumed_size);
+  assert_int32(1071, ==, session->recv_window_size);
+  assert_int32(1071, ==, stream->recv_window_size);
 
   /* Receive the same DATA frame, but in 2 parts: first 9 = 1 + 50
      bytes which includes byte up to middle of data, 2nd part is the
      remainder */
-  CU_ASSERT((ssize_t)(NGHTTP2_FRAME_HDLEN + 51) ==
-            nghttp2_session_mem_recv(session, data, NGHTTP2_FRAME_HDLEN + 51));
-  CU_ASSERT(769 == session->consumed_size);
-  CU_ASSERT(769 == stream->consumed_size);
-  CU_ASSERT(1122 == session->recv_window_size);
-  CU_ASSERT(1122 == stream->recv_window_size);
+  assert_ptrdiff(
+      (nghttp2_ssize)(NGHTTP2_FRAME_HDLEN + 51), ==,
+      nghttp2_session_mem_recv2(session, data, NGHTTP2_FRAME_HDLEN + 51));
+  assert_int32(769, ==, session->consumed_size);
+  assert_int32(769, ==, stream->consumed_size);
+  assert_int32(1122, ==, session->recv_window_size);
+  assert_int32(1122, ==, stream->recv_window_size);
 
   /* 357 - 51 = 306 bytes left */
-  CU_ASSERT(306 == nghttp2_session_mem_recv(session, data, 306));
-  CU_ASSERT(1024 == session->consumed_size);
-  CU_ASSERT(1024 == stream->consumed_size);
-  CU_ASSERT(1428 == session->recv_window_size);
-  CU_ASSERT(1428 == stream->recv_window_size);
+  assert_ptrdiff(306, ==, nghttp2_session_mem_recv2(session, data, 306));
+  assert_int32(1024, ==, session->consumed_size);
+  assert_int32(1024, ==, stream->consumed_size);
+  assert_int32(1428, ==, session->recv_window_size);
+  assert_int32(1428, ==, stream->recv_window_size);
 
   nghttp2_session_del(session);
 }
@@ -7744,13 +7985,13 @@ void test_nghttp2_session_data_read_temporal_failure(void) {
   nghttp2_session *session;
   nghttp2_session_callbacks callbacks;
   my_user_data ud;
-  nghttp2_data_provider data_prd;
+  nghttp2_data_provider2 data_prd;
   nghttp2_frame frame;
   nghttp2_stream *stream;
   size_t data_size = 128 * 1024;
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
   callbacks.on_frame_send_callback = on_frame_send_callback;
   data_prd.read_callback = fixed_length_data_source_read_callback;
 
@@ -7758,17 +7999,18 @@ void test_nghttp2_session_data_read_temporal_failure(void) {
 
   /* Initial window size is 64KiB - 1 */
   nghttp2_session_client_new(&session, &callbacks, &ud);
-  nghttp2_submit_request(session, NULL, NULL, 0, &data_prd, NULL);
+  nghttp2_submit_request2(session, NULL, NULL, 0, &data_prd, NULL);
 
   /* Sends NGHTTP2_INITIAL_WINDOW_SIZE data, assuming, it is equal to
      or smaller than NGHTTP2_INITIAL_CONNECTION_WINDOW_SIZE */
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(data_size - NGHTTP2_INITIAL_WINDOW_SIZE == ud.data_source_length);
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_size(data_size - NGHTTP2_INITIAL_WINDOW_SIZE, ==,
+              ud.data_source_length);
 
   stream = nghttp2_session_get_stream(session, 1);
-  CU_ASSERT(NGHTTP2_DATA == stream->item->frame.hd.type);
+  assert_uint8(NGHTTP2_DATA, ==, stream->item->frame.hd.type);
 
-  stream->item->aux_data.data.data_prd.read_callback =
+  stream->item->aux_data.data.dpw.data_prd.v1.read_callback =
       temporal_failure_data_source_read_callback;
 
   /* Back NGHTTP2_INITIAL_WINDOW_SIZE to both connection-level and
@@ -7782,16 +8024,17 @@ void test_nghttp2_session_data_read_temporal_failure(void) {
 
   /* Sending data will fail (soft fail) and treated as stream error */
   ud.frame_send_cb_called = 0;
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(data_size - NGHTTP2_INITIAL_WINDOW_SIZE == ud.data_source_length);
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_size(data_size - NGHTTP2_INITIAL_WINDOW_SIZE, ==,
+              ud.data_source_length);
 
-  CU_ASSERT(1 == ud.frame_send_cb_called);
-  CU_ASSERT(NGHTTP2_RST_STREAM == ud.sent_frame_type);
+  assert_int(1, ==, ud.frame_send_cb_called);
+  assert_uint8(NGHTTP2_RST_STREAM, ==, ud.sent_frame_type);
 
   data_prd.read_callback = fail_data_source_read_callback;
-  nghttp2_submit_request(session, NULL, NULL, 0, &data_prd, NULL);
+  nghttp2_submit_request2(session, NULL, NULL, 0, &data_prd, NULL);
   /* Sending data will fail (hard fail) and session tear down */
-  CU_ASSERT(NGHTTP2_ERR_CALLBACK_FAILURE == nghttp2_session_send(session));
+  assert_int(NGHTTP2_ERR_CALLBACK_FAILURE, ==, nghttp2_session_send(session));
 
   nghttp2_session_del(session);
 }
@@ -7810,9 +8053,9 @@ void test_nghttp2_session_on_stream_close(void) {
   stream =
       open_sent_stream3(session, 1, NGHTTP2_STREAM_FLAG_NONE, &pri_spec_default,
                         NGHTTP2_STREAM_OPENED, &user_data);
-  CU_ASSERT(stream != NULL);
-  CU_ASSERT(nghttp2_session_close_stream(session, 1, NGHTTP2_NO_ERROR) == 0);
-  CU_ASSERT(user_data.stream_close_cb_called == 1);
+  assert_not_null(stream);
+  assert_int(0, ==, nghttp2_session_close_stream(session, 1, NGHTTP2_NO_ERROR));
+  assert_int(1, ==, user_data.stream_close_cb_called);
   nghttp2_session_del(session);
 }
 
@@ -7824,7 +8067,7 @@ void test_nghttp2_session_on_ctrl_not_send(void) {
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
   callbacks.on_frame_not_send_callback = on_frame_not_send_callback;
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
   user_data.frame_not_send_cb_called = 0;
   user_data.not_sent_frame_type = 0;
   user_data.not_sent_error = 0;
@@ -7836,57 +8079,64 @@ void test_nghttp2_session_on_ctrl_not_send(void) {
 
   /* Check response HEADERS */
   /* Send bogus stream ID */
-  CU_ASSERT(0 == nghttp2_submit_headers(session, NGHTTP2_FLAG_END_STREAM, 3,
-                                        NULL, NULL, 0, NULL));
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(1 == user_data.frame_not_send_cb_called);
-  CU_ASSERT(NGHTTP2_HEADERS == user_data.not_sent_frame_type);
-  CU_ASSERT(NGHTTP2_ERR_STREAM_CLOSED == user_data.not_sent_error);
+  assert_int32(0, ==,
+               nghttp2_submit_headers(session, NGHTTP2_FLAG_END_STREAM, 3, NULL,
+                                      NULL, 0, NULL));
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_int(1, ==, user_data.frame_not_send_cb_called);
+  assert_uint8(NGHTTP2_HEADERS, ==, user_data.not_sent_frame_type);
+  assert_int(NGHTTP2_ERR_STREAM_CLOSED, ==, user_data.not_sent_error);
 
   user_data.frame_not_send_cb_called = 0;
   /* Shutdown transmission */
   stream->shut_flags |= NGHTTP2_SHUT_WR;
-  CU_ASSERT(0 == nghttp2_submit_headers(session, NGHTTP2_FLAG_END_STREAM, 1,
-                                        NULL, NULL, 0, NULL));
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(1 == user_data.frame_not_send_cb_called);
-  CU_ASSERT(NGHTTP2_HEADERS == user_data.not_sent_frame_type);
-  CU_ASSERT(NGHTTP2_ERR_STREAM_SHUT_WR == user_data.not_sent_error);
+  assert_int32(0, ==,
+               nghttp2_submit_headers(session, NGHTTP2_FLAG_END_STREAM, 1, NULL,
+                                      NULL, 0, NULL));
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_int(1, ==, user_data.frame_not_send_cb_called);
+  assert_uint8(NGHTTP2_HEADERS, ==, user_data.not_sent_frame_type);
+  assert_int(NGHTTP2_ERR_STREAM_SHUT_WR, ==, user_data.not_sent_error);
 
   stream->shut_flags = NGHTTP2_SHUT_NONE;
   user_data.frame_not_send_cb_called = 0;
   /* Queue RST_STREAM */
-  CU_ASSERT(0 == nghttp2_submit_headers(session, NGHTTP2_FLAG_END_STREAM, 1,
-                                        NULL, NULL, 0, NULL));
-  CU_ASSERT(0 == nghttp2_submit_rst_stream(session, NGHTTP2_FLAG_NONE, 1,
-                                           NGHTTP2_INTERNAL_ERROR));
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(1 == user_data.frame_not_send_cb_called);
-  CU_ASSERT(NGHTTP2_HEADERS == user_data.not_sent_frame_type);
-  CU_ASSERT(NGHTTP2_ERR_STREAM_CLOSING == user_data.not_sent_error);
+  assert_int32(0, ==,
+               nghttp2_submit_headers(session, NGHTTP2_FLAG_END_STREAM, 1, NULL,
+                                      NULL, 0, NULL));
+  assert_int(0, ==,
+             nghttp2_submit_rst_stream(session, NGHTTP2_FLAG_NONE, 1,
+                                       NGHTTP2_INTERNAL_ERROR));
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_int(1, ==, user_data.frame_not_send_cb_called);
+  assert_uint8(NGHTTP2_HEADERS, ==, user_data.not_sent_frame_type);
+  assert_int(NGHTTP2_ERR_STREAM_CLOSING, ==, user_data.not_sent_error);
 
   nghttp2_session_del(session);
 
   /* Check request HEADERS */
   user_data.frame_not_send_cb_called = 0;
-  CU_ASSERT(nghttp2_session_client_new(&session, &callbacks, &user_data) == 0);
+  assert_int(0, ==,
+             nghttp2_session_client_new(&session, &callbacks, &user_data));
   /* Maximum Stream ID is reached */
   session->next_stream_id = (1u << 31) + 1;
-  CU_ASSERT(NGHTTP2_ERR_STREAM_ID_NOT_AVAILABLE ==
-            nghttp2_submit_headers(session, NGHTTP2_FLAG_END_STREAM, -1, NULL,
-                                   NULL, 0, NULL));
+  assert_int32(NGHTTP2_ERR_STREAM_ID_NOT_AVAILABLE, ==,
+               nghttp2_submit_headers(session, NGHTTP2_FLAG_END_STREAM, -1,
+                                      NULL, NULL, 0, NULL));
 
   user_data.frame_not_send_cb_called = 0;
   /* GOAWAY received */
   session->goaway_flags |= NGHTTP2_GOAWAY_RECV;
   session->next_stream_id = 9;
 
-  CU_ASSERT(0 < nghttp2_submit_headers(session, NGHTTP2_FLAG_END_STREAM, -1,
-                                       NULL, NULL, 0, NULL));
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(1 == user_data.frame_not_send_cb_called);
-  CU_ASSERT(NGHTTP2_HEADERS == user_data.not_sent_frame_type);
-  CU_ASSERT(NGHTTP2_ERR_START_STREAM_NOT_ALLOWED == user_data.not_sent_error);
+  assert_int32(0, <,
+               nghttp2_submit_headers(session, NGHTTP2_FLAG_END_STREAM, -1,
+                                      NULL, NULL, 0, NULL));
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_int(1, ==, user_data.frame_not_send_cb_called);
+  assert_uint8(NGHTTP2_HEADERS, ==, user_data.not_sent_frame_type);
+  assert_int(NGHTTP2_ERR_START_STREAM_NOT_ALLOWED, ==,
+             user_data.not_sent_error);
 
   nghttp2_session_del(session);
 }
@@ -7896,15 +8146,16 @@ void test_nghttp2_session_get_outbound_queue_size(void) {
   nghttp2_session_callbacks callbacks;
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  CU_ASSERT(0 == nghttp2_session_client_new(&session, &callbacks, NULL));
-  CU_ASSERT(0 == nghttp2_session_get_outbound_queue_size(session));
+  assert_int(0, ==, nghttp2_session_client_new(&session, &callbacks, NULL));
+  assert_size(0, ==, nghttp2_session_get_outbound_queue_size(session));
 
-  CU_ASSERT(0 == nghttp2_submit_ping(session, NGHTTP2_FLAG_NONE, NULL));
-  CU_ASSERT(1 == nghttp2_session_get_outbound_queue_size(session));
+  assert_int(0, ==, nghttp2_submit_ping(session, NGHTTP2_FLAG_NONE, NULL));
+  assert_size(1, ==, nghttp2_session_get_outbound_queue_size(session));
 
-  CU_ASSERT(0 == nghttp2_submit_goaway(session, NGHTTP2_FLAG_NONE, 2,
-                                       NGHTTP2_NO_ERROR, NULL, 0));
-  CU_ASSERT(2 == nghttp2_session_get_outbound_queue_size(session));
+  assert_int(0, ==,
+             nghttp2_submit_goaway(session, NGHTTP2_FLAG_NONE, 2,
+                                   NGHTTP2_NO_ERROR, NULL, 0));
+  assert_size(2, ==, nghttp2_session_get_outbound_queue_size(session));
 
   nghttp2_session_del(session);
 }
@@ -7915,84 +8166,89 @@ void test_nghttp2_session_get_effective_local_window_size(void) {
   nghttp2_stream *stream;
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  CU_ASSERT(0 == nghttp2_session_client_new(&session, &callbacks, NULL));
+  assert_int(0, ==, nghttp2_session_client_new(&session, &callbacks, NULL));
 
   stream = open_sent_stream(session, 1);
 
-  CU_ASSERT(NGHTTP2_INITIAL_CONNECTION_WINDOW_SIZE ==
-            nghttp2_session_get_effective_local_window_size(session));
-  CU_ASSERT(0 == nghttp2_session_get_effective_recv_data_length(session));
+  assert_int32(NGHTTP2_INITIAL_CONNECTION_WINDOW_SIZE, ==,
+               nghttp2_session_get_effective_local_window_size(session));
+  assert_int32(0, ==, nghttp2_session_get_effective_recv_data_length(session));
 
-  CU_ASSERT(NGHTTP2_INITIAL_WINDOW_SIZE ==
-            nghttp2_session_get_stream_effective_local_window_size(session, 1));
-  CU_ASSERT(0 ==
-            nghttp2_session_get_stream_effective_recv_data_length(session, 1));
+  assert_int32(
+      NGHTTP2_INITIAL_WINDOW_SIZE, ==,
+      nghttp2_session_get_stream_effective_local_window_size(session, 1));
+  assert_int32(
+      0, ==, nghttp2_session_get_stream_effective_recv_data_length(session, 1));
 
   /* Check connection flow control */
   session->recv_window_size = 100;
   nghttp2_submit_window_update(session, NGHTTP2_FLAG_NONE, 0, 1100);
 
-  CU_ASSERT(NGHTTP2_INITIAL_CONNECTION_WINDOW_SIZE + 1000 ==
-            nghttp2_session_get_effective_local_window_size(session));
-  CU_ASSERT(NGHTTP2_INITIAL_CONNECTION_WINDOW_SIZE + 1000 ==
-            nghttp2_session_get_local_window_size(session));
-  CU_ASSERT(0 == nghttp2_session_get_effective_recv_data_length(session));
+  assert_int32(NGHTTP2_INITIAL_CONNECTION_WINDOW_SIZE + 1000, ==,
+               nghttp2_session_get_effective_local_window_size(session));
+  assert_int32(NGHTTP2_INITIAL_CONNECTION_WINDOW_SIZE + 1000, ==,
+               nghttp2_session_get_local_window_size(session));
+  assert_int32(0, ==, nghttp2_session_get_effective_recv_data_length(session));
 
   nghttp2_submit_window_update(session, NGHTTP2_FLAG_NONE, 0, -50);
   /* Now session->recv_window_size = -50 */
-  CU_ASSERT(-50 == session->recv_window_size);
-  CU_ASSERT(50 == session->recv_reduction);
-  CU_ASSERT(NGHTTP2_INITIAL_CONNECTION_WINDOW_SIZE + 950 ==
-            nghttp2_session_get_effective_local_window_size(session));
-  CU_ASSERT(NGHTTP2_INITIAL_CONNECTION_WINDOW_SIZE + 1000 ==
-            nghttp2_session_get_local_window_size(session));
-  CU_ASSERT(0 == nghttp2_session_get_effective_recv_data_length(session));
+  assert_int32(-50, ==, session->recv_window_size);
+  assert_int32(50, ==, session->recv_reduction);
+  assert_int32(NGHTTP2_INITIAL_CONNECTION_WINDOW_SIZE + 950, ==,
+               nghttp2_session_get_effective_local_window_size(session));
+  assert_int32(NGHTTP2_INITIAL_CONNECTION_WINDOW_SIZE + 1000, ==,
+               nghttp2_session_get_local_window_size(session));
+  assert_int32(0, ==, nghttp2_session_get_effective_recv_data_length(session));
 
   session->recv_window_size += 50;
 
   /* Now session->recv_window_size = 0 */
 
-  CU_ASSERT(NGHTTP2_INITIAL_CONNECTION_WINDOW_SIZE + 950 ==
-            nghttp2_session_get_local_window_size(session));
+  assert_int32(NGHTTP2_INITIAL_CONNECTION_WINDOW_SIZE + 950, ==,
+               nghttp2_session_get_local_window_size(session));
 
   nghttp2_submit_window_update(session, NGHTTP2_FLAG_NONE, 0, 100);
-  CU_ASSERT(50 == session->recv_window_size);
-  CU_ASSERT(0 == session->recv_reduction);
-  CU_ASSERT(NGHTTP2_INITIAL_CONNECTION_WINDOW_SIZE + 1050 ==
-            nghttp2_session_get_effective_local_window_size(session));
-  CU_ASSERT(NGHTTP2_INITIAL_CONNECTION_WINDOW_SIZE + 1000 ==
-            nghttp2_session_get_local_window_size(session));
-  CU_ASSERT(50 == nghttp2_session_get_effective_recv_data_length(session));
+  assert_int32(50, ==, session->recv_window_size);
+  assert_int32(0, ==, session->recv_reduction);
+  assert_int32(NGHTTP2_INITIAL_CONNECTION_WINDOW_SIZE + 1050, ==,
+               nghttp2_session_get_effective_local_window_size(session));
+  assert_int32(NGHTTP2_INITIAL_CONNECTION_WINDOW_SIZE + 1000, ==,
+               nghttp2_session_get_local_window_size(session));
+  assert_int32(50, ==, nghttp2_session_get_effective_recv_data_length(session));
 
   /* Check stream flow control */
   stream->recv_window_size = 100;
   nghttp2_submit_window_update(session, NGHTTP2_FLAG_NONE, 1, 1100);
 
-  CU_ASSERT(NGHTTP2_INITIAL_WINDOW_SIZE + 1000 ==
-            nghttp2_session_get_stream_effective_local_window_size(session, 1));
-  CU_ASSERT(NGHTTP2_INITIAL_WINDOW_SIZE + 1000 ==
-            nghttp2_session_get_stream_local_window_size(session, 1));
-  CU_ASSERT(0 ==
-            nghttp2_session_get_stream_effective_recv_data_length(session, 1));
+  assert_int32(
+      NGHTTP2_INITIAL_WINDOW_SIZE + 1000, ==,
+      nghttp2_session_get_stream_effective_local_window_size(session, 1));
+  assert_int32(NGHTTP2_INITIAL_WINDOW_SIZE + 1000, ==,
+               nghttp2_session_get_stream_local_window_size(session, 1));
+  assert_int32(
+      0, ==, nghttp2_session_get_stream_effective_recv_data_length(session, 1));
 
   nghttp2_submit_window_update(session, NGHTTP2_FLAG_NONE, 1, -50);
   /* Now stream->recv_window_size = -50 */
-  CU_ASSERT(NGHTTP2_INITIAL_WINDOW_SIZE + 950 ==
-            nghttp2_session_get_stream_effective_local_window_size(session, 1));
-  CU_ASSERT(NGHTTP2_INITIAL_WINDOW_SIZE + 1000 ==
-            nghttp2_session_get_stream_local_window_size(session, 1));
-  CU_ASSERT(0 ==
-            nghttp2_session_get_stream_effective_recv_data_length(session, 1));
+  assert_int32(
+      NGHTTP2_INITIAL_WINDOW_SIZE + 950, ==,
+      nghttp2_session_get_stream_effective_local_window_size(session, 1));
+  assert_int32(NGHTTP2_INITIAL_WINDOW_SIZE + 1000, ==,
+               nghttp2_session_get_stream_local_window_size(session, 1));
+  assert_int32(
+      0, ==, nghttp2_session_get_stream_effective_recv_data_length(session, 1));
 
   stream->recv_window_size += 50;
   /* Now stream->recv_window_size = 0 */
   nghttp2_submit_window_update(session, NGHTTP2_FLAG_NONE, 1, 100);
-  CU_ASSERT(NGHTTP2_INITIAL_WINDOW_SIZE + 1050 ==
-            nghttp2_session_get_stream_effective_local_window_size(session, 1));
-  CU_ASSERT(NGHTTP2_INITIAL_WINDOW_SIZE + 1000 ==
-            nghttp2_session_get_stream_local_window_size(session, 1));
-  CU_ASSERT(50 ==
-            nghttp2_session_get_stream_effective_recv_data_length(session, 1));
+  assert_int32(
+      NGHTTP2_INITIAL_WINDOW_SIZE + 1050, ==,
+      nghttp2_session_get_stream_effective_local_window_size(session, 1));
+  assert_int32(NGHTTP2_INITIAL_WINDOW_SIZE + 1000, ==,
+               nghttp2_session_get_stream_local_window_size(session, 1));
+  assert_int32(
+      50, ==,
+      nghttp2_session_get_stream_effective_recv_data_length(session, 1));
 
   nghttp2_session_del(session);
 }
@@ -8005,7 +8261,7 @@ void test_nghttp2_session_set_option(void) {
   int rv;
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   /* Test for nghttp2_option_set_no_auto_window_update */
   nghttp2_option_new(&option);
@@ -8013,7 +8269,7 @@ void test_nghttp2_session_set_option(void) {
 
   nghttp2_session_client_new2(&session, &callbacks, NULL, option);
 
-  CU_ASSERT(session->opt_flags & NGHTTP2_OPTMASK_NO_AUTO_WINDOW_UPDATE);
+  assert_true(session->opt_flags & NGHTTP2_OPTMASK_NO_AUTO_WINDOW_UPDATE);
 
   nghttp2_session_del(session);
   nghttp2_option_del(option);
@@ -8024,7 +8280,7 @@ void test_nghttp2_session_set_option(void) {
 
   nghttp2_session_client_new2(&session, &callbacks, NULL, option);
 
-  CU_ASSERT(100 == session->remote_settings.max_concurrent_streams);
+  assert_uint32(100, ==, session->remote_settings.max_concurrent_streams);
   nghttp2_session_del(session);
   nghttp2_option_del(option);
 
@@ -8034,7 +8290,7 @@ void test_nghttp2_session_set_option(void) {
 
   nghttp2_session_client_new2(&session, &callbacks, NULL, option);
 
-  CU_ASSERT(99 == session->max_incoming_reserved_streams);
+  assert_size(99, ==, session->max_incoming_reserved_streams);
   nghttp2_session_del(session);
   nghttp2_option_del(option);
 
@@ -8044,7 +8300,7 @@ void test_nghttp2_session_set_option(void) {
 
   nghttp2_session_client_new2(&session, &callbacks, NULL, option);
 
-  CU_ASSERT(session->opt_flags & NGHTTP2_OPTMASK_NO_AUTO_PING_ACK);
+  assert_true(session->opt_flags & NGHTTP2_OPTMASK_NO_AUTO_PING_ACK);
 
   nghttp2_session_del(session);
   nghttp2_option_del(option);
@@ -8057,15 +8313,15 @@ void test_nghttp2_session_set_option(void) {
 
   deflater = &session->hd_deflater;
 
-  rv = nghttp2_submit_request(session, NULL, reqnv, ARRLEN(reqnv), NULL, NULL);
+  rv = nghttp2_submit_request2(session, NULL, reqnv, ARRLEN(reqnv), NULL, NULL);
 
-  CU_ASSERT(1 == rv);
+  assert_int(1, ==, rv);
 
   rv = nghttp2_session_send(session);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(0 == deflater->deflate_hd_table_bufsize_max);
-  CU_ASSERT(0 == deflater->ctx.hd_table_bufsize);
+  assert_int(0, ==, rv);
+  assert_size(0, ==, deflater->deflate_hd_table_bufsize_max);
+  assert_size(0, ==, deflater->ctx.hd_table_bufsize);
 
   nghttp2_session_del(session);
   nghttp2_option_del(option);
@@ -8075,11 +8331,11 @@ void test_nghttp2_session_data_backoff_by_high_pri_frame(void) {
   nghttp2_session *session;
   nghttp2_session_callbacks callbacks;
   my_user_data ud;
-  nghttp2_data_provider data_prd;
+  nghttp2_data_provider2 data_prd;
   nghttp2_stream *stream;
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = block_count_send_callback;
+  callbacks.send_callback2 = block_count_send_callback;
   callbacks.on_frame_send_callback = on_frame_send_callback;
   data_prd.read_callback = fixed_length_data_source_read_callback;
 
@@ -8087,34 +8343,34 @@ void test_nghttp2_session_data_backoff_by_high_pri_frame(void) {
   ud.data_source_length = NGHTTP2_DATA_PAYLOADLEN * 4;
 
   nghttp2_session_client_new(&session, &callbacks, &ud);
-  nghttp2_submit_request(session, NULL, NULL, 0, &data_prd, NULL);
+  nghttp2_submit_request2(session, NULL, NULL, 0, &data_prd, NULL);
 
   session->remote_window_size = 1 << 20;
 
   ud.block_count = 2;
   /* Sends request HEADERS + DATA[0] */
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
 
   stream = nghttp2_session_get_stream(session, 1);
   stream->remote_window_size = 1 << 20;
 
-  CU_ASSERT(NGHTTP2_DATA == ud.sent_frame_type);
+  assert_uint8(NGHTTP2_DATA, ==, ud.sent_frame_type);
   /* data for DATA[1] is read from data_prd but it is not sent */
-  CU_ASSERT(ud.data_source_length == NGHTTP2_DATA_PAYLOADLEN * 2);
+  assert_size(ud.data_source_length, ==, NGHTTP2_DATA_PAYLOADLEN * 2);
 
   nghttp2_submit_ping(session, NGHTTP2_FLAG_NONE, NULL);
   ud.block_count = 2;
   /* Sends DATA[1] + PING, PING is interleaved in DATA sequence */
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(NGHTTP2_PING == ud.sent_frame_type);
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_uint8(NGHTTP2_PING, ==, ud.sent_frame_type);
   /* data for DATA[2] is read from data_prd but it is not sent */
-  CU_ASSERT(ud.data_source_length == NGHTTP2_DATA_PAYLOADLEN);
+  assert_size(ud.data_source_length, ==, NGHTTP2_DATA_PAYLOADLEN);
 
   ud.block_count = 2;
   /* Sends DATA[2..3] */
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
 
-  CU_ASSERT(stream->shut_flags & NGHTTP2_SHUT_WR);
+  assert_true(stream->shut_flags & NGHTTP2_SHUT_WR);
 
   nghttp2_session_del(session);
 }
@@ -8140,10 +8396,11 @@ static void check_session_recv_data_with_padding(nghttp2_bufs *bufs,
   ud.frame_recv_cb_called = 0;
   ud.data_chunk_len = 0;
 
-  CU_ASSERT((ssize_t)inlen == nghttp2_session_mem_recv(session, in, inlen));
+  assert_ptrdiff((nghttp2_ssize)inlen, ==,
+                 nghttp2_session_mem_recv2(session, in, inlen));
 
-  CU_ASSERT(1 == ud.frame_recv_cb_called);
-  CU_ASSERT(datalen == ud.data_chunk_len);
+  assert_int(1, ==, ud.frame_recv_cb_called);
+  assert_size(datalen, ==, ud.data_chunk_len);
 
   mem->free(in, NULL);
   nghttp2_session_del(session);
@@ -8153,7 +8410,7 @@ void test_nghttp2_session_pack_data_with_padding(void) {
   nghttp2_session *session;
   my_user_data ud;
   nghttp2_session_callbacks callbacks;
-  nghttp2_data_provider data_prd;
+  nghttp2_data_provider2 data_prd;
   nghttp2_frame *frame;
   size_t datalen = 55;
   nghttp2_mem *mem;
@@ -8161,9 +8418,9 @@ void test_nghttp2_session_pack_data_with_padding(void) {
   mem = nghttp2_mem_default();
 
   memset(&callbacks, 0, sizeof(callbacks));
-  callbacks.send_callback = block_count_send_callback;
+  callbacks.send_callback2 = block_count_send_callback;
   callbacks.on_frame_send_callback = on_frame_send_callback;
-  callbacks.select_padding_callback = select_padding_callback;
+  callbacks.select_padding_callback2 = select_padding_callback;
 
   data_prd.read_callback = fixed_length_data_source_read_callback;
 
@@ -8171,17 +8428,17 @@ void test_nghttp2_session_pack_data_with_padding(void) {
 
   ud.padlen = 63;
 
-  nghttp2_submit_request(session, NULL, NULL, 0, &data_prd, NULL);
+  nghttp2_submit_request2(session, NULL, NULL, 0, &data_prd, NULL);
   ud.block_count = 1;
   ud.data_source_length = datalen;
   /* Sends HEADERS */
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(NGHTTP2_HEADERS == ud.sent_frame_type);
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_uint8(NGHTTP2_HEADERS, ==, ud.sent_frame_type);
 
   frame = &session->aob.item->frame;
 
-  CU_ASSERT(ud.padlen == frame->data.padlen);
-  CU_ASSERT(frame->hd.flags & NGHTTP2_FLAG_PADDED);
+  assert_size(ud.padlen, ==, frame->data.padlen);
+  assert_true(frame->hd.flags & NGHTTP2_FLAG_PADDED);
 
   /* Check reception of this DATA frame */
   check_session_recv_data_with_padding(&session->aob.framebufs, datalen, mem);
@@ -8196,9 +8453,9 @@ void test_nghttp2_session_pack_headers_with_padding(void) {
   nghttp2_session_callbacks callbacks;
 
   memset(&callbacks, 0, sizeof(callbacks));
-  callbacks.send_callback = accumulator_send_callback;
+  callbacks.send_callback2 = accumulator_send_callback;
   callbacks.on_frame_send_callback = on_frame_send_callback;
-  callbacks.select_padding_callback = select_padding_callback;
+  callbacks.select_padding_callback2 = select_padding_callback;
   callbacks.on_frame_recv_callback = on_frame_recv_callback;
 
   acc.length = 0;
@@ -8209,16 +8466,17 @@ void test_nghttp2_session_pack_headers_with_padding(void) {
 
   ud.padlen = 163;
 
-  CU_ASSERT(1 == nghttp2_submit_request(session, NULL, reqnv, ARRLEN(reqnv),
-                                        NULL, NULL));
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int32(
+      1, ==,
+      nghttp2_submit_request2(session, NULL, reqnv, ARRLEN(reqnv), NULL, NULL));
+  assert_int(0, ==, nghttp2_session_send(session));
 
-  CU_ASSERT(acc.length < NGHTTP2_MAX_PAYLOADLEN);
+  assert_size(NGHTTP2_MAX_PAYLOADLEN, >, acc.length);
   ud.frame_recv_cb_called = 0;
-  CU_ASSERT((ssize_t)acc.length ==
-            nghttp2_session_mem_recv(sv_session, acc.buf, acc.length));
-  CU_ASSERT(1 == ud.frame_recv_cb_called);
-  CU_ASSERT(NULL == nghttp2_session_get_next_ob_item(sv_session));
+  assert_ptrdiff((nghttp2_ssize)acc.length, ==,
+                 nghttp2_session_mem_recv2(sv_session, acc.buf, acc.length));
+  assert_int(1, ==, ud.frame_recv_cb_called);
+  assert_null(nghttp2_session_get_next_ob_item(sv_session));
 
   nghttp2_session_del(sv_session);
   nghttp2_session_del(session);
@@ -8227,7 +8485,7 @@ void test_nghttp2_session_pack_headers_with_padding(void) {
 void test_nghttp2_pack_settings_payload(void) {
   nghttp2_settings_entry iv[2];
   uint8_t buf[64];
-  ssize_t len;
+  nghttp2_ssize len;
   nghttp2_settings_entry *resiv;
   size_t resniv;
   nghttp2_mem *mem;
@@ -8239,28 +8497,29 @@ void test_nghttp2_pack_settings_payload(void) {
   iv[1].settings_id = NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE;
   iv[1].value = 4095;
 
-  len = nghttp2_pack_settings_payload(buf, sizeof(buf), iv, 2);
-  CU_ASSERT(2 * NGHTTP2_FRAME_SETTINGS_ENTRY_LENGTH == len);
-  CU_ASSERT(0 == nghttp2_frame_unpack_settings_payload2(&resiv, &resniv, buf,
-                                                        (size_t)len, mem));
-  CU_ASSERT(2 == resniv);
-  CU_ASSERT(NGHTTP2_SETTINGS_HEADER_TABLE_SIZE == resiv[0].settings_id);
-  CU_ASSERT(1023 == resiv[0].value);
-  CU_ASSERT(NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE == resiv[1].settings_id);
-  CU_ASSERT(4095 == resiv[1].value);
+  len = nghttp2_pack_settings_payload2(buf, sizeof(buf), iv, 2);
+  assert_ptrdiff(2 * NGHTTP2_FRAME_SETTINGS_ENTRY_LENGTH, ==, len);
+  assert_int(0, ==,
+             nghttp2_frame_unpack_settings_payload2(&resiv, &resniv, buf,
+                                                    (size_t)len, mem));
+  assert_size(2, ==, resniv);
+  assert_int32(NGHTTP2_SETTINGS_HEADER_TABLE_SIZE, ==, resiv[0].settings_id);
+  assert_uint32(1023, ==, resiv[0].value);
+  assert_int32(NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE, ==, resiv[1].settings_id);
+  assert_uint32(4095, ==, resiv[1].value);
 
   mem->free(resiv, NULL);
 
-  len = nghttp2_pack_settings_payload(buf, 9 /* too small */, iv, 2);
-  CU_ASSERT(NGHTTP2_ERR_INSUFF_BUFSIZE == len);
+  len = nghttp2_pack_settings_payload2(buf, 9 /* too small */, iv, 2);
+  assert_ptrdiff(NGHTTP2_ERR_INSUFF_BUFSIZE, ==, len);
 }
 
 #define check_stream_dep_sib(STREAM, DEP_PREV, DEP_NEXT, SIB_PREV, SIB_NEXT)   \
   do {                                                                         \
-    CU_ASSERT(DEP_PREV == STREAM->dep_prev);                                   \
-    CU_ASSERT(DEP_NEXT == STREAM->dep_next);                                   \
-    CU_ASSERT(SIB_PREV == STREAM->sib_prev);                                   \
-    CU_ASSERT(SIB_NEXT == STREAM->sib_next);                                   \
+    assert_ptr_equal(DEP_PREV, STREAM->dep_prev);                              \
+    assert_ptr_equal(DEP_NEXT, STREAM->dep_next);                              \
+    assert_ptr_equal(SIB_PREV, STREAM->sib_prev);                              \
+    assert_ptr_equal(SIB_NEXT, STREAM->sib_next);                              \
   } while (0)
 
 /* nghttp2_stream_dep_add() and its families functions should be
@@ -8290,17 +8549,17 @@ void test_nghttp2_session_stream_dep_add(void) {
    *    d
    */
 
-  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT * 2 == a->sum_dep_weight);
-  CU_ASSERT(0 == b->sum_dep_weight);
-  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT == c->sum_dep_weight);
-  CU_ASSERT(0 == d->sum_dep_weight);
+  assert_int32(NGHTTP2_DEFAULT_WEIGHT * 2, ==, a->sum_dep_weight);
+  assert_int32(0, ==, b->sum_dep_weight);
+  assert_int32(NGHTTP2_DEFAULT_WEIGHT, ==, c->sum_dep_weight);
+  assert_int32(0, ==, d->sum_dep_weight);
 
   check_stream_dep_sib(a, root, b, NULL, NULL);
   check_stream_dep_sib(b, a, NULL, NULL, c);
   check_stream_dep_sib(c, a, d, b, NULL);
   check_stream_dep_sib(d, c, NULL, NULL, NULL);
 
-  CU_ASSERT(a == session->root.dep_next);
+  assert_ptr_equal(a, session->root.dep_next);
 
   e = open_stream_with_dep_excl(session, 9, a);
 
@@ -8313,11 +8572,11 @@ void test_nghttp2_session_stream_dep_add(void) {
    *    d
    */
 
-  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT == a->sum_dep_weight);
-  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT * 2 == e->sum_dep_weight);
-  CU_ASSERT(0 == b->sum_dep_weight);
-  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT == c->sum_dep_weight);
-  CU_ASSERT(0 == d->sum_dep_weight);
+  assert_int32(NGHTTP2_DEFAULT_WEIGHT, ==, a->sum_dep_weight);
+  assert_int32(NGHTTP2_DEFAULT_WEIGHT * 2, ==, e->sum_dep_weight);
+  assert_int32(0, ==, b->sum_dep_weight);
+  assert_int32(NGHTTP2_DEFAULT_WEIGHT, ==, c->sum_dep_weight);
+  assert_int32(0, ==, d->sum_dep_weight);
 
   check_stream_dep_sib(a, root, e, NULL, NULL);
   check_stream_dep_sib(e, a, b, NULL, NULL);
@@ -8325,7 +8584,7 @@ void test_nghttp2_session_stream_dep_add(void) {
   check_stream_dep_sib(c, e, d, b, NULL);
   check_stream_dep_sib(d, c, NULL, NULL, NULL);
 
-  CU_ASSERT(a == session->root.dep_next);
+  assert_ptr_equal(a, session->root.dep_next);
 
   nghttp2_session_del(session);
 }
@@ -8362,17 +8621,17 @@ void test_nghttp2_session_stream_dep_remove(void) {
    * d
    */
 
-  CU_ASSERT(0 == a->sum_dep_weight);
-  CU_ASSERT(0 == b->sum_dep_weight);
-  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT == c->sum_dep_weight);
-  CU_ASSERT(0 == d->sum_dep_weight);
+  assert_int32(0, ==, a->sum_dep_weight);
+  assert_int32(0, ==, b->sum_dep_weight);
+  assert_int32(NGHTTP2_DEFAULT_WEIGHT, ==, c->sum_dep_weight);
+  assert_int32(0, ==, d->sum_dep_weight);
 
   check_stream_dep_sib(a, NULL, NULL, NULL, NULL);
   check_stream_dep_sib(b, root, NULL, c, NULL);
   check_stream_dep_sib(c, root, d, NULL, b);
   check_stream_dep_sib(d, c, NULL, NULL, NULL);
 
-  CU_ASSERT(c == session->root.dep_next);
+  assert_ptr_equal(c, session->root.dep_next);
 
   nghttp2_session_del(session);
 
@@ -8403,17 +8662,17 @@ void test_nghttp2_session_stream_dep_remove(void) {
    * d
    */
 
-  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT == a->sum_dep_weight);
-  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT == c->sum_dep_weight);
-  CU_ASSERT(0 == d->sum_dep_weight);
-  CU_ASSERT(0 == b->sum_dep_weight);
+  assert_int32(NGHTTP2_DEFAULT_WEIGHT, ==, a->sum_dep_weight);
+  assert_int32(NGHTTP2_DEFAULT_WEIGHT, ==, c->sum_dep_weight);
+  assert_int32(0, ==, d->sum_dep_weight);
+  assert_int32(0, ==, b->sum_dep_weight);
 
   check_stream_dep_sib(a, root, c, NULL, NULL);
   check_stream_dep_sib(b, NULL, NULL, NULL, NULL);
   check_stream_dep_sib(c, a, d, NULL, NULL);
   check_stream_dep_sib(d, c, NULL, NULL, NULL);
 
-  CU_ASSERT(a == session->root.dep_next);
+  assert_ptr_equal(a, session->root.dep_next);
 
   nghttp2_session_del(session);
 
@@ -8443,11 +8702,11 @@ void test_nghttp2_session_stream_dep_remove(void) {
    * e--d--b
    */
 
-  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT * 2 == a->sum_dep_weight);
-  CU_ASSERT(0 == b->sum_dep_weight);
-  CU_ASSERT(0 == d->sum_dep_weight);
-  CU_ASSERT(0 == c->sum_dep_weight);
-  CU_ASSERT(0 == e->sum_dep_weight);
+  assert_int32(NGHTTP2_DEFAULT_WEIGHT * 2, ==, a->sum_dep_weight);
+  assert_int32(0, ==, b->sum_dep_weight);
+  assert_int32(0, ==, d->sum_dep_weight);
+  assert_int32(0, ==, c->sum_dep_weight);
+  assert_int32(0, ==, e->sum_dep_weight);
 
   check_stream_dep_sib(a, root, e, NULL, NULL);
   check_stream_dep_sib(b, a, NULL, d, NULL);
@@ -8476,12 +8735,12 @@ void test_nghttp2_session_stream_dep_remove(void) {
    *    f--e
    */
 
-  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT * 3 == a->sum_dep_weight);
-  CU_ASSERT(0 == b->sum_dep_weight);
-  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT * 2 == c->sum_dep_weight);
-  CU_ASSERT(0 == d->sum_dep_weight);
-  CU_ASSERT(0 == e->sum_dep_weight);
-  CU_ASSERT(0 == f->sum_dep_weight);
+  assert_int32(NGHTTP2_DEFAULT_WEIGHT * 3, ==, a->sum_dep_weight);
+  assert_int32(0, ==, b->sum_dep_weight);
+  assert_int32(NGHTTP2_DEFAULT_WEIGHT * 2, ==, c->sum_dep_weight);
+  assert_int32(0, ==, d->sum_dep_weight);
+  assert_int32(0, ==, e->sum_dep_weight);
+  assert_int32(0, ==, f->sum_dep_weight);
 
   nghttp2_stream_dep_remove(c);
 
@@ -8493,12 +8752,12 @@ void test_nghttp2_session_stream_dep_remove(void) {
 
   /* c's weight 16 is distributed evenly to e and f.  Each weight of e
      and f becomes 8. */
-  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT * 2 + 8 * 2 == a->sum_dep_weight);
-  CU_ASSERT(0 == b->sum_dep_weight);
-  CU_ASSERT(0 == c->sum_dep_weight);
-  CU_ASSERT(0 == d->sum_dep_weight);
-  CU_ASSERT(0 == e->sum_dep_weight);
-  CU_ASSERT(0 == f->sum_dep_weight);
+  assert_int32(NGHTTP2_DEFAULT_WEIGHT * 2 + 8 * 2, ==, a->sum_dep_weight);
+  assert_int32(0, ==, b->sum_dep_weight);
+  assert_int32(0, ==, c->sum_dep_weight);
+  assert_int32(0, ==, d->sum_dep_weight);
+  assert_int32(0, ==, e->sum_dep_weight);
+  assert_int32(0, ==, f->sum_dep_weight);
 
   check_stream_dep_sib(a, root, d, NULL, NULL);
   check_stream_dep_sib(b, a, NULL, e, NULL);
@@ -8548,12 +8807,12 @@ void test_nghttp2_session_stream_dep_add_subtree(void) {
    * f  d
    */
 
-  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT * 3 == a->sum_dep_weight);
-  CU_ASSERT(0 == b->sum_dep_weight);
-  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT == c->sum_dep_weight);
-  CU_ASSERT(0 == d->sum_dep_weight);
-  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT == e->sum_dep_weight);
-  CU_ASSERT(0 == f->sum_dep_weight);
+  assert_int32(NGHTTP2_DEFAULT_WEIGHT * 3, ==, a->sum_dep_weight);
+  assert_int32(0, ==, b->sum_dep_weight);
+  assert_int32(NGHTTP2_DEFAULT_WEIGHT, ==, c->sum_dep_weight);
+  assert_int32(0, ==, d->sum_dep_weight);
+  assert_int32(NGHTTP2_DEFAULT_WEIGHT, ==, e->sum_dep_weight);
+  assert_int32(0, ==, f->sum_dep_weight);
 
   check_stream_dep_sib(a, root, e, NULL, NULL);
   check_stream_dep_sib(b, a, NULL, c, NULL);
@@ -8597,12 +8856,12 @@ void test_nghttp2_session_stream_dep_add_subtree(void) {
    *    d
    */
 
-  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT == a->sum_dep_weight);
-  CU_ASSERT(0 == b->sum_dep_weight);
-  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT == c->sum_dep_weight);
-  CU_ASSERT(0 == d->sum_dep_weight);
-  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT * 3 == e->sum_dep_weight);
-  CU_ASSERT(0 == f->sum_dep_weight);
+  assert_int32(NGHTTP2_DEFAULT_WEIGHT, ==, a->sum_dep_weight);
+  assert_int32(0, ==, b->sum_dep_weight);
+  assert_int32(NGHTTP2_DEFAULT_WEIGHT, ==, c->sum_dep_weight);
+  assert_int32(0, ==, d->sum_dep_weight);
+  assert_int32(NGHTTP2_DEFAULT_WEIGHT * 3, ==, e->sum_dep_weight);
+  assert_int32(0, ==, f->sum_dep_weight);
 
   check_stream_dep_sib(a, root, e, NULL, NULL);
   check_stream_dep_sib(e, a, f, NULL, NULL);
@@ -8646,10 +8905,10 @@ void test_nghttp2_session_stream_dep_remove_subtree(void) {
    * b  d
    */
 
-  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT == a->sum_dep_weight);
-  CU_ASSERT(0 == b->sum_dep_weight);
-  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT == c->sum_dep_weight);
-  CU_ASSERT(0 == d->sum_dep_weight);
+  assert_int32(NGHTTP2_DEFAULT_WEIGHT, ==, a->sum_dep_weight);
+  assert_int32(0, ==, b->sum_dep_weight);
+  assert_int32(NGHTTP2_DEFAULT_WEIGHT, ==, c->sum_dep_weight);
+  assert_int32(0, ==, d->sum_dep_weight);
 
   check_stream_dep_sib(a, root, b, NULL, NULL);
   check_stream_dep_sib(b, a, NULL, NULL, NULL);
@@ -8685,10 +8944,10 @@ void test_nghttp2_session_stream_dep_remove_subtree(void) {
    * d
    */
 
-  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT == a->sum_dep_weight);
-  CU_ASSERT(0 == b->sum_dep_weight);
-  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT == c->sum_dep_weight);
-  CU_ASSERT(0 == d->sum_dep_weight);
+  assert_int32(NGHTTP2_DEFAULT_WEIGHT, ==, a->sum_dep_weight);
+  assert_int32(0, ==, b->sum_dep_weight);
+  assert_int32(NGHTTP2_DEFAULT_WEIGHT, ==, c->sum_dep_weight);
+  assert_int32(0, ==, d->sum_dep_weight);
 
   check_stream_dep_sib(a, root, c, NULL, NULL);
   check_stream_dep_sib(c, a, d, NULL, NULL);
@@ -8723,11 +8982,11 @@ void test_nghttp2_session_stream_dep_remove_subtree(void) {
    * b--e  d
    */
 
-  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT * 2 == a->sum_dep_weight);
-  CU_ASSERT(0 == b->sum_dep_weight);
-  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT == c->sum_dep_weight);
-  CU_ASSERT(0 == d->sum_dep_weight);
-  CU_ASSERT(0 == e->sum_dep_weight);
+  assert_int32(NGHTTP2_DEFAULT_WEIGHT * 2, ==, a->sum_dep_weight);
+  assert_int32(0, ==, b->sum_dep_weight);
+  assert_int32(NGHTTP2_DEFAULT_WEIGHT, ==, c->sum_dep_weight);
+  assert_int32(0, ==, d->sum_dep_weight);
+  assert_int32(0, ==, e->sum_dep_weight);
 
   check_stream_dep_sib(a, root, b, NULL, NULL);
   check_stream_dep_sib(b, a, NULL, NULL, e);
@@ -8764,7 +9023,7 @@ void test_nghttp2_session_stream_dep_all_your_stream_are_belong_to_us(void) {
    */
 
   nghttp2_stream_dep_remove_subtree(c);
-  CU_ASSERT(0 == nghttp2_stream_dep_insert_subtree(&session->root, c));
+  assert_int(0, ==, nghttp2_stream_dep_insert_subtree(&session->root, c));
 
   /*
    * c
@@ -8774,13 +9033,13 @@ void test_nghttp2_session_stream_dep_all_your_stream_are_belong_to_us(void) {
    * b
    */
 
-  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT == c->sum_dep_weight);
-  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT == a->sum_dep_weight);
-  CU_ASSERT(0 == b->sum_dep_weight);
+  assert_int32(NGHTTP2_DEFAULT_WEIGHT, ==, c->sum_dep_weight);
+  assert_int32(NGHTTP2_DEFAULT_WEIGHT, ==, a->sum_dep_weight);
+  assert_int32(0, ==, b->sum_dep_weight);
 
-  CU_ASSERT(nghttp2_pq_empty(&a->obq));
-  CU_ASSERT(nghttp2_pq_empty(&b->obq));
-  CU_ASSERT(nghttp2_pq_empty(&c->obq));
+  assert_true(nghttp2_pq_empty(&a->obq));
+  assert_true(nghttp2_pq_empty(&b->obq));
+  assert_true(nghttp2_pq_empty(&c->obq));
 
   check_stream_dep_sib(c, root, a, NULL, NULL);
   check_stream_dep_sib(a, c, b, NULL, NULL);
@@ -8801,7 +9060,7 @@ void test_nghttp2_session_stream_dep_all_your_stream_are_belong_to_us(void) {
    */
 
   nghttp2_stream_dep_remove_subtree(c);
-  CU_ASSERT(0 == nghttp2_stream_dep_insert_subtree(&session->root, c));
+  assert_int(0, ==, nghttp2_stream_dep_insert_subtree(&session->root, c));
 
   /*
    * c
@@ -8809,13 +9068,13 @@ void test_nghttp2_session_stream_dep_all_your_stream_are_belong_to_us(void) {
    * b--a
    */
 
-  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT * 2 == c->sum_dep_weight);
-  CU_ASSERT(0 == b->sum_dep_weight);
-  CU_ASSERT(0 == a->sum_dep_weight);
+  assert_int32(NGHTTP2_DEFAULT_WEIGHT * 2, ==, c->sum_dep_weight);
+  assert_int32(0, ==, b->sum_dep_weight);
+  assert_int32(0, ==, a->sum_dep_weight);
 
-  CU_ASSERT(nghttp2_pq_empty(&a->obq));
-  CU_ASSERT(nghttp2_pq_empty(&b->obq));
-  CU_ASSERT(nghttp2_pq_empty(&c->obq));
+  assert_true(nghttp2_pq_empty(&a->obq));
+  assert_true(nghttp2_pq_empty(&b->obq));
+  assert_true(nghttp2_pq_empty(&c->obq));
 
   check_stream_dep_sib(c, root, b, NULL, NULL);
   check_stream_dep_sib(b, c, NULL, NULL, a);
@@ -8839,7 +9098,7 @@ void test_nghttp2_session_stream_dep_all_your_stream_are_belong_to_us(void) {
    */
 
   nghttp2_stream_dep_remove_subtree(c);
-  CU_ASSERT(0 == nghttp2_stream_dep_insert_subtree(&session->root, c));
+  assert_int(0, ==, nghttp2_stream_dep_insert_subtree(&session->root, c));
 
   /*
    * c
@@ -8849,15 +9108,15 @@ void test_nghttp2_session_stream_dep_all_your_stream_are_belong_to_us(void) {
    *    b
    */
 
-  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT * 2 == c->sum_dep_weight);
-  CU_ASSERT(0 == d->sum_dep_weight);
-  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT == a->sum_dep_weight);
-  CU_ASSERT(0 == b->sum_dep_weight);
+  assert_int32(NGHTTP2_DEFAULT_WEIGHT * 2, ==, c->sum_dep_weight);
+  assert_int32(0, ==, d->sum_dep_weight);
+  assert_int32(NGHTTP2_DEFAULT_WEIGHT, ==, a->sum_dep_weight);
+  assert_int32(0, ==, b->sum_dep_weight);
 
-  CU_ASSERT(nghttp2_pq_empty(&a->obq));
-  CU_ASSERT(nghttp2_pq_empty(&b->obq));
-  CU_ASSERT(nghttp2_pq_empty(&c->obq));
-  CU_ASSERT(nghttp2_pq_empty(&d->obq));
+  assert_true(nghttp2_pq_empty(&a->obq));
+  assert_true(nghttp2_pq_empty(&b->obq));
+  assert_true(nghttp2_pq_empty(&c->obq));
+  assert_true(nghttp2_pq_empty(&d->obq));
 
   check_stream_dep_sib(c, root, d, NULL, NULL);
   check_stream_dep_sib(d, c, NULL, NULL, a);
@@ -8886,7 +9145,7 @@ void test_nghttp2_session_stream_dep_all_your_stream_are_belong_to_us(void) {
   nghttp2_stream_attach_item(b, db);
 
   nghttp2_stream_dep_remove_subtree(c);
-  CU_ASSERT(0 == nghttp2_stream_dep_insert_subtree(&session->root, c));
+  assert_int(0, ==, nghttp2_stream_dep_insert_subtree(&session->root, c));
 
   /*
    * c
@@ -8896,14 +9155,14 @@ void test_nghttp2_session_stream_dep_all_your_stream_are_belong_to_us(void) {
    *    b
    */
 
-  CU_ASSERT(c->queued);
-  CU_ASSERT(a->queued);
-  CU_ASSERT(b->queued);
-  CU_ASSERT(!d->queued);
+  assert_true(c->queued);
+  assert_true(a->queued);
+  assert_true(b->queued);
+  assert_true(!d->queued);
 
-  CU_ASSERT(1 == nghttp2_pq_size(&a->obq));
-  CU_ASSERT(1 == nghttp2_pq_size(&c->obq));
-  CU_ASSERT(nghttp2_pq_empty(&d->obq));
+  assert_size(1, ==, nghttp2_pq_size(&a->obq));
+  assert_size(1, ==, nghttp2_pq_size(&c->obq));
+  assert_true(nghttp2_pq_empty(&d->obq));
 
   check_stream_dep_sib(c, root, d, NULL, NULL);
   check_stream_dep_sib(d, c, NULL, NULL, a);
@@ -8934,7 +9193,7 @@ void test_nghttp2_session_stream_dep_all_your_stream_are_belong_to_us(void) {
   nghttp2_stream_attach_item(c, dc);
 
   nghttp2_stream_dep_remove_subtree(c);
-  CU_ASSERT(0 == nghttp2_stream_dep_insert_subtree(&session->root, c));
+  assert_int(0, ==, nghttp2_stream_dep_insert_subtree(&session->root, c));
 
   /*
    * c
@@ -8944,10 +9203,10 @@ void test_nghttp2_session_stream_dep_all_your_stream_are_belong_to_us(void) {
    *    b
    */
 
-  CU_ASSERT(c->queued);
-  CU_ASSERT(a->queued);
-  CU_ASSERT(b->queued);
-  CU_ASSERT(!d->queued);
+  assert_true(c->queued);
+  assert_true(a->queued);
+  assert_true(b->queued);
+  assert_true(!d->queued);
 
   check_stream_dep_sib(c, root, d, NULL, NULL);
   check_stream_dep_sib(d, c, NULL, NULL, a);
@@ -8986,80 +9245,80 @@ void test_nghttp2_session_stream_attach_item(void) {
 
   nghttp2_stream_attach_item(b, db);
 
-  CU_ASSERT(a->queued);
-  CU_ASSERT(b->queued);
-  CU_ASSERT(!c->queued);
-  CU_ASSERT(!d->queued);
+  assert_true(a->queued);
+  assert_true(b->queued);
+  assert_true(!c->queued);
+  assert_true(!d->queued);
 
-  CU_ASSERT(1 == nghttp2_pq_size(&a->obq));
+  assert_size(1, ==, nghttp2_pq_size(&a->obq));
 
   /* Attach item to c */
   dc = create_data_ob_item(mem);
 
   nghttp2_stream_attach_item(c, dc);
 
-  CU_ASSERT(a->queued);
-  CU_ASSERT(b->queued);
-  CU_ASSERT(c->queued);
-  CU_ASSERT(!d->queued);
+  assert_true(a->queued);
+  assert_true(b->queued);
+  assert_true(c->queued);
+  assert_true(!d->queued);
 
-  CU_ASSERT(2 == nghttp2_pq_size(&a->obq));
+  assert_size(2, ==, nghttp2_pq_size(&a->obq));
 
   /* Attach item to a */
   da = create_data_ob_item(mem);
 
   nghttp2_stream_attach_item(a, da);
 
-  CU_ASSERT(a->queued);
-  CU_ASSERT(b->queued);
-  CU_ASSERT(c->queued);
-  CU_ASSERT(!d->queued);
+  assert_true(a->queued);
+  assert_true(b->queued);
+  assert_true(c->queued);
+  assert_true(!d->queued);
 
-  CU_ASSERT(2 == nghttp2_pq_size(&a->obq));
+  assert_size(2, ==, nghttp2_pq_size(&a->obq));
 
   /* Detach item from a */
   nghttp2_stream_detach_item(a);
 
-  CU_ASSERT(a->queued);
-  CU_ASSERT(b->queued);
-  CU_ASSERT(c->queued);
-  CU_ASSERT(!d->queued);
+  assert_true(a->queued);
+  assert_true(b->queued);
+  assert_true(c->queued);
+  assert_true(!d->queued);
 
-  CU_ASSERT(2 == nghttp2_pq_size(&a->obq));
+  assert_size(2, ==, nghttp2_pq_size(&a->obq));
 
   /* Attach item to d */
   dd = create_data_ob_item(mem);
 
   nghttp2_stream_attach_item(d, dd);
 
-  CU_ASSERT(a->queued);
-  CU_ASSERT(b->queued);
-  CU_ASSERT(c->queued);
-  CU_ASSERT(d->queued);
+  assert_true(a->queued);
+  assert_true(b->queued);
+  assert_true(c->queued);
+  assert_true(d->queued);
 
-  CU_ASSERT(2 == nghttp2_pq_size(&a->obq));
-  CU_ASSERT(1 == nghttp2_pq_size(&c->obq));
+  assert_size(2, ==, nghttp2_pq_size(&a->obq));
+  assert_size(1, ==, nghttp2_pq_size(&c->obq));
 
   /* Detach item from c */
   nghttp2_stream_detach_item(c);
 
-  CU_ASSERT(a->queued);
-  CU_ASSERT(b->queued);
-  CU_ASSERT(c->queued);
-  CU_ASSERT(d->queued);
+  assert_true(a->queued);
+  assert_true(b->queued);
+  assert_true(c->queued);
+  assert_true(d->queued);
 
-  CU_ASSERT(2 == nghttp2_pq_size(&a->obq));
-  CU_ASSERT(1 == nghttp2_pq_size(&c->obq));
+  assert_size(2, ==, nghttp2_pq_size(&a->obq));
+  assert_size(1, ==, nghttp2_pq_size(&c->obq));
 
   /* Detach item from b */
   nghttp2_stream_detach_item(b);
 
-  CU_ASSERT(a->queued);
-  CU_ASSERT(!b->queued);
-  CU_ASSERT(c->queued);
-  CU_ASSERT(d->queued);
+  assert_true(a->queued);
+  assert_true(!b->queued);
+  assert_true(c->queued);
+  assert_true(d->queued);
 
-  CU_ASSERT(1 == nghttp2_pq_size(&a->obq));
+  assert_size(1, ==, nghttp2_pq_size(&a->obq));
 
   /* exercises insertion */
   e = open_stream_with_dep_excl(session, 9, a);
@@ -9073,17 +9332,17 @@ void test_nghttp2_session_stream_attach_item(void) {
    * d
    */
 
-  CU_ASSERT(a->queued);
-  CU_ASSERT(e->queued);
-  CU_ASSERT(!b->queued);
-  CU_ASSERT(c->queued);
-  CU_ASSERT(d->queued);
+  assert_true(a->queued);
+  assert_true(e->queued);
+  assert_true(!b->queued);
+  assert_true(c->queued);
+  assert_true(d->queued);
 
-  CU_ASSERT(1 == nghttp2_pq_size(&a->obq));
-  CU_ASSERT(1 == nghttp2_pq_size(&e->obq));
-  CU_ASSERT(nghttp2_pq_empty(&b->obq));
-  CU_ASSERT(1 == nghttp2_pq_size(&c->obq));
-  CU_ASSERT(nghttp2_pq_empty(&d->obq));
+  assert_size(1, ==, nghttp2_pq_size(&a->obq));
+  assert_size(1, ==, nghttp2_pq_size(&e->obq));
+  assert_true(nghttp2_pq_empty(&b->obq));
+  assert_size(1, ==, nghttp2_pq_size(&c->obq));
+  assert_true(nghttp2_pq_empty(&d->obq));
 
   /* exercises deletion */
   nghttp2_stream_dep_remove(e);
@@ -9095,20 +9354,20 @@ void test_nghttp2_session_stream_attach_item(void) {
    * d
    */
 
-  CU_ASSERT(a->queued);
-  CU_ASSERT(!b->queued);
-  CU_ASSERT(c->queued);
-  CU_ASSERT(d->queued);
+  assert_true(a->queued);
+  assert_true(!b->queued);
+  assert_true(c->queued);
+  assert_true(d->queued);
 
-  CU_ASSERT(1 == nghttp2_pq_size(&a->obq));
-  CU_ASSERT(nghttp2_pq_empty(&b->obq));
-  CU_ASSERT(1 == nghttp2_pq_size(&c->obq));
-  CU_ASSERT(nghttp2_pq_empty(&d->obq));
+  assert_size(1, ==, nghttp2_pq_size(&a->obq));
+  assert_true(nghttp2_pq_empty(&b->obq));
+  assert_size(1, ==, nghttp2_pq_size(&c->obq));
+  assert_true(nghttp2_pq_empty(&d->obq));
 
   /* e's weight 16 is distributed equally among c and b, both now have
      weight 8 each. */
-  CU_ASSERT(8 == b->weight);
-  CU_ASSERT(8 == c->weight);
+  assert_int32(8, ==, b->weight);
+  assert_int32(8, ==, c->weight);
 
   /* da, db, dc have been detached */
   nghttp2_outbound_item_free(da, mem);
@@ -9142,28 +9401,28 @@ void test_nghttp2_session_stream_attach_item(void) {
   nghttp2_stream_attach_item(b, db);
   nghttp2_stream_attach_item(c, dc);
 
-  CU_ASSERT(a->queued);
-  CU_ASSERT(b->queued);
-  CU_ASSERT(c->queued);
-  CU_ASSERT(!d->queued);
+  assert_true(a->queued);
+  assert_true(b->queued);
+  assert_true(c->queued);
+  assert_true(!d->queued);
 
-  CU_ASSERT(2 == nghttp2_pq_size(&a->obq));
-  CU_ASSERT(nghttp2_pq_empty(&b->obq));
-  CU_ASSERT(nghttp2_pq_empty(&c->obq));
-  CU_ASSERT(nghttp2_pq_empty(&d->obq));
+  assert_size(2, ==, nghttp2_pq_size(&a->obq));
+  assert_true(nghttp2_pq_empty(&b->obq));
+  assert_true(nghttp2_pq_empty(&c->obq));
+  assert_true(nghttp2_pq_empty(&d->obq));
 
   /* Detach item from a */
   nghttp2_stream_detach_item(a);
 
-  CU_ASSERT(a->queued);
-  CU_ASSERT(b->queued);
-  CU_ASSERT(c->queued);
-  CU_ASSERT(!d->queued);
+  assert_true(a->queued);
+  assert_true(b->queued);
+  assert_true(c->queued);
+  assert_true(!d->queued);
 
-  CU_ASSERT(2 == nghttp2_pq_size(&a->obq));
-  CU_ASSERT(nghttp2_pq_empty(&b->obq));
-  CU_ASSERT(nghttp2_pq_empty(&c->obq));
-  CU_ASSERT(nghttp2_pq_empty(&d->obq));
+  assert_size(2, ==, nghttp2_pq_size(&a->obq));
+  assert_true(nghttp2_pq_empty(&b->obq));
+  assert_true(nghttp2_pq_empty(&c->obq));
+  assert_true(nghttp2_pq_empty(&d->obq));
 
   /* da has been detached */
   nghttp2_outbound_item_free(da, mem);
@@ -9209,19 +9468,19 @@ void test_nghttp2_session_stream_attach_item_subtree(void) {
 
   nghttp2_stream_attach_item(b, db);
 
-  CU_ASSERT(a->queued);
-  CU_ASSERT(b->queued);
-  CU_ASSERT(!c->queued);
-  CU_ASSERT(!d->queued);
-  CU_ASSERT(e->queued);
-  CU_ASSERT(!f->queued);
+  assert_true(a->queued);
+  assert_true(b->queued);
+  assert_true(!c->queued);
+  assert_true(!d->queued);
+  assert_true(e->queued);
+  assert_true(!f->queued);
 
-  CU_ASSERT(1 == nghttp2_pq_size(&a->obq));
-  CU_ASSERT(nghttp2_pq_empty(&b->obq));
-  CU_ASSERT(nghttp2_pq_empty(&c->obq));
-  CU_ASSERT(nghttp2_pq_empty(&d->obq));
-  CU_ASSERT(nghttp2_pq_empty(&e->obq));
-  CU_ASSERT(nghttp2_pq_empty(&f->obq));
+  assert_size(1, ==, nghttp2_pq_size(&a->obq));
+  assert_true(nghttp2_pq_empty(&b->obq));
+  assert_true(nghttp2_pq_empty(&c->obq));
+  assert_true(nghttp2_pq_empty(&d->obq));
+  assert_true(nghttp2_pq_empty(&e->obq));
+  assert_true(nghttp2_pq_empty(&f->obq));
 
   /* Insert subtree e under a */
 
@@ -9238,25 +9497,25 @@ void test_nghttp2_session_stream_attach_item_subtree(void) {
    *    d
    */
 
-  CU_ASSERT(a->queued);
-  CU_ASSERT(b->queued);
-  CU_ASSERT(!c->queued);
-  CU_ASSERT(!d->queued);
-  CU_ASSERT(e->queued);
-  CU_ASSERT(!f->queued);
+  assert_true(a->queued);
+  assert_true(b->queued);
+  assert_true(!c->queued);
+  assert_true(!d->queued);
+  assert_true(e->queued);
+  assert_true(!f->queued);
 
-  CU_ASSERT(1 == nghttp2_pq_size(&a->obq));
-  CU_ASSERT(nghttp2_pq_empty(&b->obq));
-  CU_ASSERT(nghttp2_pq_empty(&c->obq));
-  CU_ASSERT(nghttp2_pq_empty(&d->obq));
-  CU_ASSERT(1 == nghttp2_pq_size(&e->obq));
-  CU_ASSERT(nghttp2_pq_empty(&f->obq));
+  assert_size(1, ==, nghttp2_pq_size(&a->obq));
+  assert_true(nghttp2_pq_empty(&b->obq));
+  assert_true(nghttp2_pq_empty(&c->obq));
+  assert_true(nghttp2_pq_empty(&d->obq));
+  assert_size(1, ==, nghttp2_pq_size(&e->obq));
+  assert_true(nghttp2_pq_empty(&f->obq));
 
   /* Remove subtree b */
 
   nghttp2_stream_dep_remove_subtree(b);
 
-  CU_ASSERT(0 == nghttp2_stream_dep_add_subtree(&session->root, b));
+  assert_int(0, ==, nghttp2_stream_dep_add_subtree(&session->root, b));
 
   /*
    * a       b
@@ -9268,45 +9527,45 @@ void test_nghttp2_session_stream_attach_item_subtree(void) {
    *    d
    */
 
-  CU_ASSERT(a->queued);
-  CU_ASSERT(b->queued);
-  CU_ASSERT(!c->queued);
-  CU_ASSERT(!d->queued);
-  CU_ASSERT(e->queued);
-  CU_ASSERT(!f->queued);
+  assert_true(a->queued);
+  assert_true(b->queued);
+  assert_true(!c->queued);
+  assert_true(!d->queued);
+  assert_true(e->queued);
+  assert_true(!f->queued);
 
-  CU_ASSERT(1 == nghttp2_pq_size(&a->obq));
-  CU_ASSERT(nghttp2_pq_empty(&b->obq));
-  CU_ASSERT(nghttp2_pq_empty(&c->obq));
-  CU_ASSERT(nghttp2_pq_empty(&d->obq));
-  CU_ASSERT(nghttp2_pq_empty(&e->obq));
-  CU_ASSERT(nghttp2_pq_empty(&f->obq));
+  assert_size(1, ==, nghttp2_pq_size(&a->obq));
+  assert_true(nghttp2_pq_empty(&b->obq));
+  assert_true(nghttp2_pq_empty(&c->obq));
+  assert_true(nghttp2_pq_empty(&d->obq));
+  assert_true(nghttp2_pq_empty(&e->obq));
+  assert_true(nghttp2_pq_empty(&f->obq));
 
   /* Remove subtree a, and add it to root again */
 
   nghttp2_stream_dep_remove_subtree(a);
 
-  CU_ASSERT(0 == nghttp2_stream_dep_add_subtree(&session->root, a));
+  assert_int(0, ==, nghttp2_stream_dep_add_subtree(&session->root, a));
 
-  CU_ASSERT(a->queued);
-  CU_ASSERT(b->queued);
-  CU_ASSERT(!c->queued);
-  CU_ASSERT(!d->queued);
-  CU_ASSERT(e->queued);
-  CU_ASSERT(!f->queued);
+  assert_true(a->queued);
+  assert_true(b->queued);
+  assert_true(!c->queued);
+  assert_true(!d->queued);
+  assert_true(e->queued);
+  assert_true(!f->queued);
 
-  CU_ASSERT(1 == nghttp2_pq_size(&a->obq));
-  CU_ASSERT(nghttp2_pq_empty(&b->obq));
-  CU_ASSERT(nghttp2_pq_empty(&c->obq));
-  CU_ASSERT(nghttp2_pq_empty(&d->obq));
-  CU_ASSERT(nghttp2_pq_empty(&e->obq));
-  CU_ASSERT(nghttp2_pq_empty(&f->obq));
+  assert_size(1, ==, nghttp2_pq_size(&a->obq));
+  assert_true(nghttp2_pq_empty(&b->obq));
+  assert_true(nghttp2_pq_empty(&c->obq));
+  assert_true(nghttp2_pq_empty(&d->obq));
+  assert_true(nghttp2_pq_empty(&e->obq));
+  assert_true(nghttp2_pq_empty(&f->obq));
 
   /* Remove subtree c */
 
   nghttp2_stream_dep_remove_subtree(c);
 
-  CU_ASSERT(0 == nghttp2_stream_dep_add_subtree(&session->root, c));
+  assert_int(0, ==, nghttp2_stream_dep_add_subtree(&session->root, c));
 
   /*
    * a       b     c
@@ -9316,19 +9575,19 @@ void test_nghttp2_session_stream_attach_item_subtree(void) {
    * f
    */
 
-  CU_ASSERT(a->queued);
-  CU_ASSERT(b->queued);
-  CU_ASSERT(!c->queued);
-  CU_ASSERT(!d->queued);
-  CU_ASSERT(e->queued);
-  CU_ASSERT(!f->queued);
+  assert_true(a->queued);
+  assert_true(b->queued);
+  assert_true(!c->queued);
+  assert_true(!d->queued);
+  assert_true(e->queued);
+  assert_true(!f->queued);
 
-  CU_ASSERT(1 == nghttp2_pq_size(&a->obq));
-  CU_ASSERT(nghttp2_pq_empty(&b->obq));
-  CU_ASSERT(nghttp2_pq_empty(&c->obq));
-  CU_ASSERT(nghttp2_pq_empty(&d->obq));
-  CU_ASSERT(nghttp2_pq_empty(&e->obq));
-  CU_ASSERT(nghttp2_pq_empty(&f->obq));
+  assert_size(1, ==, nghttp2_pq_size(&a->obq));
+  assert_true(nghttp2_pq_empty(&b->obq));
+  assert_true(nghttp2_pq_empty(&c->obq));
+  assert_true(nghttp2_pq_empty(&d->obq));
+  assert_true(nghttp2_pq_empty(&e->obq));
+  assert_true(nghttp2_pq_empty(&f->obq));
 
   dd = create_data_ob_item(mem);
 
@@ -9347,19 +9606,19 @@ void test_nghttp2_session_stream_attach_item_subtree(void) {
    * d  f
    */
 
-  CU_ASSERT(a->queued);
-  CU_ASSERT(b->queued);
-  CU_ASSERT(c->queued);
-  CU_ASSERT(d->queued);
-  CU_ASSERT(e->queued);
-  CU_ASSERT(!f->queued);
+  assert_true(a->queued);
+  assert_true(b->queued);
+  assert_true(c->queued);
+  assert_true(d->queued);
+  assert_true(e->queued);
+  assert_true(!f->queued);
 
-  CU_ASSERT(2 == nghttp2_pq_size(&a->obq));
-  CU_ASSERT(nghttp2_pq_empty(&b->obq));
-  CU_ASSERT(1 == nghttp2_pq_size(&c->obq));
-  CU_ASSERT(nghttp2_pq_empty(&d->obq));
-  CU_ASSERT(nghttp2_pq_empty(&e->obq));
-  CU_ASSERT(nghttp2_pq_empty(&f->obq));
+  assert_size(2, ==, nghttp2_pq_size(&a->obq));
+  assert_true(nghttp2_pq_empty(&b->obq));
+  assert_size(1, ==, nghttp2_pq_size(&c->obq));
+  assert_true(nghttp2_pq_empty(&d->obq));
+  assert_true(nghttp2_pq_empty(&e->obq));
+  assert_true(nghttp2_pq_empty(&f->obq));
 
   /* Insert b under a */
 
@@ -9376,24 +9635,24 @@ void test_nghttp2_session_stream_attach_item_subtree(void) {
    * d  f
    */
 
-  CU_ASSERT(a->queued);
-  CU_ASSERT(b->queued);
-  CU_ASSERT(c->queued);
-  CU_ASSERT(d->queued);
-  CU_ASSERT(e->queued);
-  CU_ASSERT(!f->queued);
+  assert_true(a->queued);
+  assert_true(b->queued);
+  assert_true(c->queued);
+  assert_true(d->queued);
+  assert_true(e->queued);
+  assert_true(!f->queued);
 
-  CU_ASSERT(1 == nghttp2_pq_size(&a->obq));
-  CU_ASSERT(2 == nghttp2_pq_size(&b->obq));
-  CU_ASSERT(1 == nghttp2_pq_size(&c->obq));
-  CU_ASSERT(nghttp2_pq_empty(&d->obq));
-  CU_ASSERT(nghttp2_pq_empty(&e->obq));
-  CU_ASSERT(nghttp2_pq_empty(&f->obq));
+  assert_size(1, ==, nghttp2_pq_size(&a->obq));
+  assert_size(2, ==, nghttp2_pq_size(&b->obq));
+  assert_size(1, ==, nghttp2_pq_size(&c->obq));
+  assert_true(nghttp2_pq_empty(&d->obq));
+  assert_true(nghttp2_pq_empty(&e->obq));
+  assert_true(nghttp2_pq_empty(&f->obq));
 
   /* Remove subtree b */
 
   nghttp2_stream_dep_remove_subtree(b);
-  CU_ASSERT(0 == nghttp2_stream_dep_add_subtree(&session->root, b));
+  assert_int(0, ==, nghttp2_stream_dep_add_subtree(&session->root, b));
 
   /*
    * b       a
@@ -9403,19 +9662,19 @@ void test_nghttp2_session_stream_attach_item_subtree(void) {
    * f  d
    */
 
-  CU_ASSERT(!a->queued);
-  CU_ASSERT(b->queued);
-  CU_ASSERT(c->queued);
-  CU_ASSERT(d->queued);
-  CU_ASSERT(e->queued);
-  CU_ASSERT(!f->queued);
+  assert_true(!a->queued);
+  assert_true(b->queued);
+  assert_true(c->queued);
+  assert_true(d->queued);
+  assert_true(e->queued);
+  assert_true(!f->queued);
 
-  CU_ASSERT(nghttp2_pq_empty(&a->obq));
-  CU_ASSERT(2 == nghttp2_pq_size(&b->obq));
-  CU_ASSERT(1 == nghttp2_pq_size(&c->obq));
-  CU_ASSERT(nghttp2_pq_empty(&d->obq));
-  CU_ASSERT(nghttp2_pq_empty(&e->obq));
-  CU_ASSERT(nghttp2_pq_empty(&f->obq));
+  assert_true(nghttp2_pq_empty(&a->obq));
+  assert_size(2, ==, nghttp2_pq_size(&b->obq));
+  assert_size(1, ==, nghttp2_pq_size(&c->obq));
+  assert_true(nghttp2_pq_empty(&d->obq));
+  assert_true(nghttp2_pq_empty(&e->obq));
+  assert_true(nghttp2_pq_empty(&f->obq));
 
   /* Remove subtree c, and detach item from b, and then re-add
      subtree c under b */
@@ -9432,19 +9691,19 @@ void test_nghttp2_session_stream_attach_item_subtree(void) {
    * f  d
    */
 
-  CU_ASSERT(!a->queued);
-  CU_ASSERT(b->queued);
-  CU_ASSERT(c->queued);
-  CU_ASSERT(d->queued);
-  CU_ASSERT(e->queued);
-  CU_ASSERT(!f->queued);
+  assert_true(!a->queued);
+  assert_true(b->queued);
+  assert_true(c->queued);
+  assert_true(d->queued);
+  assert_true(e->queued);
+  assert_true(!f->queued);
 
-  CU_ASSERT(nghttp2_pq_empty(&a->obq));
-  CU_ASSERT(2 == nghttp2_pq_size(&b->obq));
-  CU_ASSERT(1 == nghttp2_pq_size(&c->obq));
-  CU_ASSERT(nghttp2_pq_empty(&d->obq));
-  CU_ASSERT(nghttp2_pq_empty(&e->obq));
-  CU_ASSERT(nghttp2_pq_empty(&f->obq));
+  assert_true(nghttp2_pq_empty(&a->obq));
+  assert_size(2, ==, nghttp2_pq_size(&b->obq));
+  assert_size(1, ==, nghttp2_pq_size(&c->obq));
+  assert_true(nghttp2_pq_empty(&d->obq));
+  assert_true(nghttp2_pq_empty(&e->obq));
+  assert_true(nghttp2_pq_empty(&f->obq));
 
   /* Attach data to a, and add subtree a under b */
 
@@ -9461,19 +9720,19 @@ void test_nghttp2_session_stream_attach_item_subtree(void) {
    *    f  d
    */
 
-  CU_ASSERT(a->queued);
-  CU_ASSERT(b->queued);
-  CU_ASSERT(c->queued);
-  CU_ASSERT(d->queued);
-  CU_ASSERT(e->queued);
-  CU_ASSERT(!f->queued);
+  assert_true(a->queued);
+  assert_true(b->queued);
+  assert_true(c->queued);
+  assert_true(d->queued);
+  assert_true(e->queued);
+  assert_true(!f->queued);
 
-  CU_ASSERT(nghttp2_pq_empty(&a->obq));
-  CU_ASSERT(3 == nghttp2_pq_size(&b->obq));
-  CU_ASSERT(1 == nghttp2_pq_size(&c->obq));
-  CU_ASSERT(nghttp2_pq_empty(&d->obq));
-  CU_ASSERT(nghttp2_pq_empty(&e->obq));
-  CU_ASSERT(nghttp2_pq_empty(&f->obq));
+  assert_true(nghttp2_pq_empty(&a->obq));
+  assert_size(3, ==, nghttp2_pq_size(&b->obq));
+  assert_size(1, ==, nghttp2_pq_size(&c->obq));
+  assert_true(nghttp2_pq_empty(&d->obq));
+  assert_true(nghttp2_pq_empty(&e->obq));
+  assert_true(nghttp2_pq_empty(&f->obq));
 
   /* Remove subtree c, and add under f */
   nghttp2_stream_dep_remove_subtree(c);
@@ -9491,19 +9750,19 @@ void test_nghttp2_session_stream_attach_item_subtree(void) {
    *    d
    */
 
-  CU_ASSERT(a->queued);
-  CU_ASSERT(b->queued);
-  CU_ASSERT(c->queued);
-  CU_ASSERT(d->queued);
-  CU_ASSERT(e->queued);
-  CU_ASSERT(f->queued);
+  assert_true(a->queued);
+  assert_true(b->queued);
+  assert_true(c->queued);
+  assert_true(d->queued);
+  assert_true(e->queued);
+  assert_true(f->queued);
 
-  CU_ASSERT(nghttp2_pq_empty(&a->obq));
-  CU_ASSERT(2 == nghttp2_pq_size(&b->obq));
-  CU_ASSERT(1 == nghttp2_pq_size(&c->obq));
-  CU_ASSERT(nghttp2_pq_empty(&d->obq));
-  CU_ASSERT(1 == nghttp2_pq_size(&e->obq));
-  CU_ASSERT(1 == nghttp2_pq_size(&f->obq));
+  assert_true(nghttp2_pq_empty(&a->obq));
+  assert_size(2, ==, nghttp2_pq_size(&b->obq));
+  assert_size(1, ==, nghttp2_pq_size(&c->obq));
+  assert_true(nghttp2_pq_empty(&d->obq));
+  assert_size(1, ==, nghttp2_pq_size(&e->obq));
+  assert_size(1, ==, nghttp2_pq_size(&f->obq));
 
   /* db has been detached */
   nghttp2_outbound_item_free(db, mem);
@@ -9520,8 +9779,8 @@ void test_nghttp2_session_stream_get_state(void) {
   nghttp2_bufs bufs;
   nghttp2_buf *buf;
   nghttp2_stream *stream;
-  ssize_t rv;
-  nghttp2_data_provider data_prd;
+  nghttp2_ssize rv;
+  nghttp2_data_provider2 data_prd;
   nghttp2_frame frame;
 
   mem = nghttp2_mem_default();
@@ -9529,28 +9788,30 @@ void test_nghttp2_session_stream_get_state(void) {
   memset(&data_prd, 0, sizeof(data_prd));
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   nghttp2_session_server_new(&session, &callbacks, NULL);
   nghttp2_hd_deflate_init(&deflater, mem);
 
-  CU_ASSERT(NGHTTP2_STREAM_STATE_IDLE ==
-            nghttp2_stream_get_state(nghttp2_session_get_root_stream(session)));
+  assert_enum(
+      nghttp2_stream_proto_state, NGHTTP2_STREAM_STATE_IDLE, ==,
+      nghttp2_stream_get_state(nghttp2_session_get_root_stream(session)));
 
   /* stream 1 HEADERS; without END_STREAM flag set */
   pack_headers(&bufs, &deflater, 1, NGHTTP2_FLAG_END_HEADERS, reqnv,
                ARRLEN(reqnv), mem);
 
   buf = &bufs.head->buf;
-  rv = nghttp2_session_mem_recv(session, buf->pos, nghttp2_buf_len(buf));
+  rv = nghttp2_session_mem_recv2(session, buf->pos, nghttp2_buf_len(buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(buf) == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(buf), ==, rv);
 
   stream = nghttp2_session_find_stream(session, 1);
 
-  CU_ASSERT(NULL != stream);
-  CU_ASSERT(1 == stream->stream_id);
-  CU_ASSERT(NGHTTP2_STREAM_STATE_OPEN == nghttp2_stream_get_state(stream));
+  assert_not_null(stream);
+  assert_int32(1, ==, stream->stream_id);
+  assert_enum(nghttp2_stream_proto_state, NGHTTP2_STREAM_STATE_OPEN, ==,
+              nghttp2_stream_get_state(stream));
 
   nghttp2_bufs_reset(&bufs);
 
@@ -9560,41 +9821,44 @@ void test_nghttp2_session_stream_get_state(void) {
                ARRLEN(reqnv), mem);
 
   buf = &bufs.head->buf;
-  rv = nghttp2_session_mem_recv(session, buf->pos, nghttp2_buf_len(buf));
+  rv = nghttp2_session_mem_recv2(session, buf->pos, nghttp2_buf_len(buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(buf) == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(buf), ==, rv);
 
   stream = nghttp2_session_find_stream(session, 3);
 
-  CU_ASSERT(NULL != stream);
-  CU_ASSERT(3 == stream->stream_id);
-  CU_ASSERT(NGHTTP2_STREAM_STATE_HALF_CLOSED_REMOTE ==
-            nghttp2_stream_get_state(stream));
+  assert_not_null(stream);
+  assert_int32(3, ==, stream->stream_id);
+  assert_enum(nghttp2_stream_proto_state,
+              NGHTTP2_STREAM_STATE_HALF_CLOSED_REMOTE, ==,
+              nghttp2_stream_get_state(stream));
 
   nghttp2_bufs_reset(&bufs);
 
   /* Respond to stream 1 */
-  nghttp2_submit_response(session, 1, resnv, ARRLEN(resnv), NULL);
+  nghttp2_submit_response2(session, 1, resnv, ARRLEN(resnv), NULL);
 
   rv = nghttp2_session_send(session);
 
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   stream = nghttp2_session_find_stream(session, 1);
 
-  CU_ASSERT(NGHTTP2_STREAM_STATE_HALF_CLOSED_LOCAL ==
-            nghttp2_stream_get_state(stream));
+  assert_enum(nghttp2_stream_proto_state,
+              NGHTTP2_STREAM_STATE_HALF_CLOSED_LOCAL, ==,
+              nghttp2_stream_get_state(stream));
 
   /* Respond to stream 3 */
-  nghttp2_submit_response(session, 3, resnv, ARRLEN(resnv), NULL);
+  nghttp2_submit_response2(session, 3, resnv, ARRLEN(resnv), NULL);
 
   rv = nghttp2_session_send(session);
 
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   stream = nghttp2_session_find_stream(session, 3);
 
-  CU_ASSERT(NGHTTP2_STREAM_STATE_CLOSED == nghttp2_stream_get_state(stream));
+  assert_enum(nghttp2_stream_proto_state, NGHTTP2_STREAM_STATE_CLOSED, ==,
+              nghttp2_stream_get_state(stream));
 
   /* stream 5 HEADERS; with END_STREAM flag set */
   pack_headers(&bufs, &deflater, 5,
@@ -9602,9 +9866,9 @@ void test_nghttp2_session_stream_get_state(void) {
                ARRLEN(reqnv), mem);
 
   buf = &bufs.head->buf;
-  rv = nghttp2_session_mem_recv(session, buf->pos, nghttp2_buf_len(buf));
+  rv = nghttp2_session_mem_recv2(session, buf->pos, nghttp2_buf_len(buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(buf) == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(buf), ==, rv);
 
   nghttp2_bufs_reset(&bufs);
 
@@ -9612,57 +9876,58 @@ void test_nghttp2_session_stream_get_state(void) {
   rv = nghttp2_submit_push_promise(session, NGHTTP2_FLAG_NONE, 5, reqnv,
                                    ARRLEN(reqnv), NULL);
 
-  CU_ASSERT(2 == rv);
+  assert_ptrdiff(2, ==, rv);
 
   rv = nghttp2_session_send(session);
 
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   stream = nghttp2_session_find_stream(session, 2);
 
-  CU_ASSERT(NGHTTP2_STREAM_STATE_RESERVED_LOCAL ==
-            nghttp2_stream_get_state(stream));
+  assert_enum(nghttp2_stream_proto_state, NGHTTP2_STREAM_STATE_RESERVED_LOCAL,
+              ==, nghttp2_stream_get_state(stream));
 
   /* Send response to push stream 2 with END_STREAM set */
-  nghttp2_submit_response(session, 2, resnv, ARRLEN(resnv), NULL);
+  nghttp2_submit_response2(session, 2, resnv, ARRLEN(resnv), NULL);
 
   rv = nghttp2_session_send(session);
 
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   stream = nghttp2_session_find_stream(session, 2);
 
   /* At server, pushed stream object is not retained after closed */
-  CU_ASSERT(NULL == stream);
+  assert_null(stream);
 
   /* Push stream 4 associated to stream 5 */
   rv = nghttp2_submit_push_promise(session, NGHTTP2_FLAG_NONE, 5, reqnv,
                                    ARRLEN(reqnv), NULL);
 
-  CU_ASSERT(4 == rv);
+  assert_ptrdiff(4, ==, rv);
 
   rv = nghttp2_session_send(session);
 
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   stream = nghttp2_session_find_stream(session, 4);
 
-  CU_ASSERT(NGHTTP2_STREAM_STATE_RESERVED_LOCAL ==
-            nghttp2_stream_get_state(stream));
+  assert_enum(nghttp2_stream_proto_state, NGHTTP2_STREAM_STATE_RESERVED_LOCAL,
+              ==, nghttp2_stream_get_state(stream));
 
   /* Send response to push stream 4 without closing */
   data_prd.read_callback = defer_data_source_read_callback;
 
-  nghttp2_submit_response(session, 4, resnv, ARRLEN(resnv), &data_prd);
+  nghttp2_submit_response2(session, 4, resnv, ARRLEN(resnv), &data_prd);
 
   rv = nghttp2_session_send(session);
 
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   stream = nghttp2_session_find_stream(session, 4);
 
-  CU_ASSERT(NGHTTP2_STREAM_STATE_HALF_CLOSED_REMOTE ==
-            nghttp2_stream_get_state(stream));
+  assert_enum(nghttp2_stream_proto_state,
+              NGHTTP2_STREAM_STATE_HALF_CLOSED_REMOTE, ==,
+              nghttp2_stream_get_state(stream));
 
   /* Create idle stream by PRIORITY frame */
   nghttp2_frame_priority_init(&frame.priority, 7, &pri_spec_default);
@@ -9672,13 +9937,14 @@ void test_nghttp2_session_stream_get_state(void) {
   nghttp2_frame_priority_free(&frame.priority);
 
   buf = &bufs.head->buf;
-  rv = nghttp2_session_mem_recv(session, buf->pos, nghttp2_buf_len(buf));
+  rv = nghttp2_session_mem_recv2(session, buf->pos, nghttp2_buf_len(buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(buf) == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(buf), ==, rv);
 
   stream = nghttp2_session_find_stream(session, 7);
 
-  CU_ASSERT(NGHTTP2_STREAM_STATE_IDLE == nghttp2_stream_get_state(stream));
+  assert_enum(nghttp2_stream_proto_state, NGHTTP2_STREAM_STATE_IDLE, ==,
+              nghttp2_stream_get_state(stream));
 
   nghttp2_bufs_reset(&bufs);
 
@@ -9690,25 +9956,25 @@ void test_nghttp2_session_stream_get_state(void) {
   nghttp2_session_client_new(&session, &callbacks, NULL);
   nghttp2_hd_deflate_init(&deflater, mem);
 
-  nghttp2_submit_request(session, NULL, reqnv, ARRLEN(reqnv), NULL, NULL);
+  nghttp2_submit_request2(session, NULL, reqnv, ARRLEN(reqnv), NULL, NULL);
 
   rv = nghttp2_session_send(session);
 
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   /* Receive PUSH_PROMISE 2 associated to stream 1 */
   pack_push_promise(&bufs, &deflater, 1, NGHTTP2_FLAG_END_HEADERS, 2, reqnv,
                     ARRLEN(reqnv), mem);
 
   buf = &bufs.head->buf;
-  rv = nghttp2_session_mem_recv(session, buf->pos, nghttp2_buf_len(buf));
+  rv = nghttp2_session_mem_recv2(session, buf->pos, nghttp2_buf_len(buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(buf) == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(buf), ==, rv);
 
   stream = nghttp2_session_find_stream(session, 2);
 
-  CU_ASSERT(NGHTTP2_STREAM_STATE_RESERVED_REMOTE ==
-            nghttp2_stream_get_state(stream));
+  assert_enum(nghttp2_stream_proto_state, NGHTTP2_STREAM_STATE_RESERVED_REMOTE,
+              ==, nghttp2_stream_get_state(stream));
 
   nghttp2_bufs_reset(&bufs);
 
@@ -9717,14 +9983,15 @@ void test_nghttp2_session_stream_get_state(void) {
                ARRLEN(resnv), mem);
 
   buf = &bufs.head->buf;
-  rv = nghttp2_session_mem_recv(session, buf->pos, nghttp2_buf_len(buf));
+  rv = nghttp2_session_mem_recv2(session, buf->pos, nghttp2_buf_len(buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(buf) == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(buf), ==, rv);
 
   stream = nghttp2_session_find_stream(session, 2);
 
-  CU_ASSERT(NGHTTP2_STREAM_STATE_HALF_CLOSED_LOCAL ==
-            nghttp2_stream_get_state(stream));
+  assert_enum(nghttp2_stream_proto_state,
+              NGHTTP2_STREAM_STATE_HALF_CLOSED_LOCAL, ==,
+              nghttp2_stream_get_state(stream));
 
   nghttp2_bufs_reset(&bufs);
 
@@ -9745,28 +10012,28 @@ void test_nghttp2_session_stream_get_something(void) {
 
   a = open_stream(session, 1);
 
-  CU_ASSERT(nghttp2_session_get_root_stream(session) ==
-            nghttp2_stream_get_parent(a));
-  CU_ASSERT(NULL == nghttp2_stream_get_previous_sibling(a));
-  CU_ASSERT(NULL == nghttp2_stream_get_next_sibling(a));
-  CU_ASSERT(NULL == nghttp2_stream_get_first_child(a));
+  assert_ptr_equal(nghttp2_session_get_root_stream(session),
+                   nghttp2_stream_get_parent(a));
+  assert_null(nghttp2_stream_get_previous_sibling(a));
+  assert_null(nghttp2_stream_get_next_sibling(a));
+  assert_null(nghttp2_stream_get_first_child(a));
 
   b = open_stream_with_dep(session, 3, a);
   c = open_stream_with_dep_weight(session, 5, 11, a);
 
-  CU_ASSERT(a == nghttp2_stream_get_parent(c));
-  CU_ASSERT(a == nghttp2_stream_get_parent(b));
+  assert_ptr_equal(a, nghttp2_stream_get_parent(c));
+  assert_ptr_equal(a, nghttp2_stream_get_parent(b));
 
-  CU_ASSERT(c == nghttp2_stream_get_first_child(a));
+  assert_ptr_equal(c, nghttp2_stream_get_first_child(a));
 
-  CU_ASSERT(b == nghttp2_stream_get_next_sibling(c));
-  CU_ASSERT(c == nghttp2_stream_get_previous_sibling(b));
+  assert_ptr_equal(b, nghttp2_stream_get_next_sibling(c));
+  assert_ptr_equal(c, nghttp2_stream_get_previous_sibling(b));
 
-  CU_ASSERT(27 == nghttp2_stream_get_sum_dependency_weight(a));
+  assert_int32(27, ==, nghttp2_stream_get_sum_dependency_weight(a));
 
-  CU_ASSERT(11 == nghttp2_stream_get_weight(c));
-  CU_ASSERT(5 == nghttp2_stream_get_stream_id(c));
-  CU_ASSERT(0 == nghttp2_stream_get_stream_id(&session->root));
+  assert_int32(11, ==, nghttp2_stream_get_weight(c));
+  assert_int32(5, ==, nghttp2_stream_get_stream_id(c));
+  assert_int32(0, ==, nghttp2_stream_get_stream_id(&session->root));
 
   nghttp2_session_del(session);
 }
@@ -9784,17 +10051,17 @@ void test_nghttp2_session_find_stream(void) {
 
   stream = nghttp2_session_find_stream(session, 1);
 
-  CU_ASSERT(NULL != stream);
-  CU_ASSERT(1 == stream->stream_id);
+  assert_not_null(stream);
+  assert_int32(1, ==, stream->stream_id);
 
   stream = nghttp2_session_find_stream(session, 0);
 
-  CU_ASSERT(&session->root == stream);
-  CU_ASSERT(0 == stream->stream_id);
+  assert_ptr_equal(&session->root, stream);
+  assert_int32(0, ==, stream->stream_id);
 
   stream = nghttp2_session_find_stream(session, 2);
 
-  CU_ASSERT(NULL == stream);
+  assert_null(stream);
 
   nghttp2_session_del(session);
 }
@@ -9808,7 +10075,7 @@ void test_nghttp2_session_keep_closed_stream(void) {
   size_t i;
 
   memset(&callbacks, 0, sizeof(callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   nghttp2_session_server_new(&session, &callbacks, NULL);
 
@@ -9818,58 +10085,58 @@ void test_nghttp2_session_keep_closed_stream(void) {
     open_recv_stream(session, (int32_t)i * 2 + 1);
   }
 
-  CU_ASSERT(0 == session->num_closed_streams);
+  assert_size(0, ==, session->num_closed_streams);
 
   nghttp2_session_close_stream(session, 1, NGHTTP2_NO_ERROR);
 
-  CU_ASSERT(1 == session->num_closed_streams);
-  CU_ASSERT(1 == session->closed_stream_tail->stream_id);
-  CU_ASSERT(session->closed_stream_tail == session->closed_stream_head);
+  assert_size(1, ==, session->num_closed_streams);
+  assert_int32(1, ==, session->closed_stream_tail->stream_id);
+  assert_ptr_equal(session->closed_stream_tail, session->closed_stream_head);
 
   nghttp2_session_close_stream(session, 5, NGHTTP2_NO_ERROR);
 
-  CU_ASSERT(2 == session->num_closed_streams);
-  CU_ASSERT(5 == session->closed_stream_tail->stream_id);
-  CU_ASSERT(1 == session->closed_stream_head->stream_id);
-  CU_ASSERT(session->closed_stream_head ==
-            session->closed_stream_tail->closed_prev);
-  CU_ASSERT(NULL == session->closed_stream_tail->closed_next);
-  CU_ASSERT(session->closed_stream_tail ==
-            session->closed_stream_head->closed_next);
-  CU_ASSERT(NULL == session->closed_stream_head->closed_prev);
+  assert_size(2, ==, session->num_closed_streams);
+  assert_int32(5, ==, session->closed_stream_tail->stream_id);
+  assert_int32(1, ==, session->closed_stream_head->stream_id);
+  assert_ptr_equal(session->closed_stream_head,
+                   session->closed_stream_tail->closed_prev);
+  assert_null(session->closed_stream_tail->closed_next);
+  assert_ptr_equal(session->closed_stream_tail,
+                   session->closed_stream_head->closed_next);
+  assert_null(session->closed_stream_head->closed_prev);
 
   open_recv_stream(session, 11);
   nghttp2_session_adjust_closed_stream(session);
 
-  CU_ASSERT(1 == session->num_closed_streams);
-  CU_ASSERT(5 == session->closed_stream_tail->stream_id);
-  CU_ASSERT(session->closed_stream_tail == session->closed_stream_head);
-  CU_ASSERT(NULL == session->closed_stream_head->closed_prev);
-  CU_ASSERT(NULL == session->closed_stream_head->closed_next);
+  assert_size(1, ==, session->num_closed_streams);
+  assert_int32(5, ==, session->closed_stream_tail->stream_id);
+  assert_ptr_equal(session->closed_stream_tail, session->closed_stream_head);
+  assert_null(session->closed_stream_head->closed_prev);
+  assert_null(session->closed_stream_head->closed_next);
 
   open_recv_stream(session, 13);
   nghttp2_session_adjust_closed_stream(session);
 
-  CU_ASSERT(0 == session->num_closed_streams);
-  CU_ASSERT(NULL == session->closed_stream_tail);
-  CU_ASSERT(NULL == session->closed_stream_head);
+  assert_size(0, ==, session->num_closed_streams);
+  assert_null(session->closed_stream_tail);
+  assert_null(session->closed_stream_head);
 
   nghttp2_session_close_stream(session, 3, NGHTTP2_NO_ERROR);
 
-  CU_ASSERT(1 == session->num_closed_streams);
-  CU_ASSERT(3 == session->closed_stream_head->stream_id);
+  assert_size(1, ==, session->num_closed_streams);
+  assert_int32(3, ==, session->closed_stream_head->stream_id);
 
   /* server initiated stream is not counted to max concurrent limit */
   open_sent_stream(session, 2);
   nghttp2_session_adjust_closed_stream(session);
 
-  CU_ASSERT(1 == session->num_closed_streams);
-  CU_ASSERT(3 == session->closed_stream_head->stream_id);
+  assert_size(1, ==, session->num_closed_streams);
+  assert_int32(3, ==, session->closed_stream_head->stream_id);
 
   nghttp2_session_close_stream(session, 2, NGHTTP2_NO_ERROR);
 
-  CU_ASSERT(1 == session->num_closed_streams);
-  CU_ASSERT(3 == session->closed_stream_head->stream_id);
+  assert_size(1, ==, session->num_closed_streams);
+  assert_int32(3, ==, session->closed_stream_head->stream_id);
 
   nghttp2_session_del(session);
 }
@@ -9884,7 +10151,7 @@ void test_nghttp2_session_keep_idle_stream(void) {
   int32_t stream_id;
 
   memset(&callbacks, 0, sizeof(callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   nghttp2_session_server_new(&session, &callbacks, NULL);
 
@@ -9897,20 +10164,20 @@ void test_nghttp2_session_keep_idle_stream(void) {
     nghttp2_session_adjust_idle_stream(session);
   }
 
-  CU_ASSERT(NGHTTP2_MIN_IDLE_STREAMS == session->num_idle_streams);
+  assert_size(NGHTTP2_MIN_IDLE_STREAMS, ==, session->num_idle_streams);
 
   stream_id = (NGHTTP2_MIN_IDLE_STREAMS - 1) * 2 + 1;
-  CU_ASSERT(1 == session->idle_stream_head->stream_id);
-  CU_ASSERT(stream_id == session->idle_stream_tail->stream_id);
+  assert_int32(1, ==, session->idle_stream_head->stream_id);
+  assert_int32(stream_id, ==, session->idle_stream_tail->stream_id);
 
   stream_id += 2;
 
   open_recv_stream2(session, stream_id, NGHTTP2_STREAM_IDLE);
   nghttp2_session_adjust_idle_stream(session);
 
-  CU_ASSERT(NGHTTP2_MIN_IDLE_STREAMS == session->num_idle_streams);
-  CU_ASSERT(3 == session->idle_stream_head->stream_id);
-  CU_ASSERT(stream_id == session->idle_stream_tail->stream_id);
+  assert_size(NGHTTP2_MIN_IDLE_STREAMS, ==, session->num_idle_streams);
+  assert_int32(3, ==, session->idle_stream_head->stream_id);
+  assert_int32(stream_id, ==, session->idle_stream_tail->stream_id);
 
   nghttp2_session_del(session);
 }
@@ -9922,7 +10189,7 @@ void test_nghttp2_session_detach_idle_stream(void) {
   nghttp2_stream *stream;
 
   memset(&callbacks, 0, sizeof(callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   nghttp2_session_server_new(&session, &callbacks, NULL);
 
@@ -9931,38 +10198,38 @@ void test_nghttp2_session_detach_idle_stream(void) {
                                 &pri_spec_default, NGHTTP2_STREAM_IDLE, NULL);
   }
 
-  CU_ASSERT(3 == session->num_idle_streams);
+  assert_size(3, ==, session->num_idle_streams);
 
   /* Detach middle stream */
   stream = nghttp2_session_get_stream_raw(session, 2);
 
-  CU_ASSERT(session->idle_stream_head == stream->closed_prev);
-  CU_ASSERT(session->idle_stream_tail == stream->closed_next);
-  CU_ASSERT(stream == session->idle_stream_head->closed_next);
-  CU_ASSERT(stream == session->idle_stream_tail->closed_prev);
+  assert_ptr_equal(session->idle_stream_head, stream->closed_prev);
+  assert_ptr_equal(session->idle_stream_tail, stream->closed_next);
+  assert_ptr_equal(stream, session->idle_stream_head->closed_next);
+  assert_ptr_equal(stream, session->idle_stream_tail->closed_prev);
 
   nghttp2_session_detach_idle_stream(session, stream);
 
-  CU_ASSERT(2 == session->num_idle_streams);
+  assert_size(2, ==, session->num_idle_streams);
 
-  CU_ASSERT(NULL == stream->closed_prev);
-  CU_ASSERT(NULL == stream->closed_next);
+  assert_null(stream->closed_prev);
+  assert_null(stream->closed_next);
 
-  CU_ASSERT(session->idle_stream_head ==
-            session->idle_stream_tail->closed_prev);
-  CU_ASSERT(session->idle_stream_tail ==
-            session->idle_stream_head->closed_next);
+  assert_ptr_equal(session->idle_stream_head,
+                   session->idle_stream_tail->closed_prev);
+  assert_ptr_equal(session->idle_stream_tail,
+                   session->idle_stream_head->closed_next);
 
   /* Detach head stream */
   stream = session->idle_stream_head;
 
   nghttp2_session_detach_idle_stream(session, stream);
 
-  CU_ASSERT(1 == session->num_idle_streams);
+  assert_size(1, ==, session->num_idle_streams);
 
-  CU_ASSERT(session->idle_stream_head == session->idle_stream_tail);
-  CU_ASSERT(NULL == session->idle_stream_head->closed_prev);
-  CU_ASSERT(NULL == session->idle_stream_head->closed_next);
+  assert_ptr_equal(session->idle_stream_head, session->idle_stream_tail);
+  assert_null(session->idle_stream_head->closed_prev);
+  assert_null(session->idle_stream_head->closed_next);
 
   /* Detach last stream */
 
@@ -9970,17 +10237,17 @@ void test_nghttp2_session_detach_idle_stream(void) {
 
   nghttp2_session_detach_idle_stream(session, stream);
 
-  CU_ASSERT(0 == session->num_idle_streams);
+  assert_size(0, ==, session->num_idle_streams);
 
-  CU_ASSERT(NULL == session->idle_stream_head);
-  CU_ASSERT(NULL == session->idle_stream_tail);
+  assert_null(session->idle_stream_head);
+  assert_null(session->idle_stream_tail);
 
   for (i = 4; i <= 5; ++i) {
     nghttp2_session_open_stream(session, i, NGHTTP2_STREAM_FLAG_NONE,
                                 &pri_spec_default, NGHTTP2_STREAM_IDLE, NULL);
   }
 
-  CU_ASSERT(2 == session->num_idle_streams);
+  assert_size(2, ==, session->num_idle_streams);
 
   /* Detach tail stream */
 
@@ -9988,11 +10255,11 @@ void test_nghttp2_session_detach_idle_stream(void) {
 
   nghttp2_session_detach_idle_stream(session, stream);
 
-  CU_ASSERT(1 == session->num_idle_streams);
+  assert_size(1, ==, session->num_idle_streams);
 
-  CU_ASSERT(session->idle_stream_head == session->idle_stream_tail);
-  CU_ASSERT(NULL == session->idle_stream_head->closed_prev);
-  CU_ASSERT(NULL == session->idle_stream_head->closed_next);
+  assert_ptr_equal(session->idle_stream_head, session->idle_stream_tail);
+  assert_null(session->idle_stream_head->closed_prev);
+  assert_null(session->idle_stream_head->closed_next);
 
   nghttp2_session_del(session);
 }
@@ -10006,7 +10273,7 @@ void test_nghttp2_session_large_dep_tree(void) {
   int32_t stream_id;
 
   memset(&callbacks, 0, sizeof(callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   nghttp2_session_server_new(&session, &callbacks, NULL);
 
@@ -10018,8 +10285,8 @@ void test_nghttp2_session_large_dep_tree(void) {
   stream_id = 1;
   for (i = 0; i < 250; ++i, stream_id += 2) {
     stream = nghttp2_session_get_stream(session, stream_id);
-    CU_ASSERT(nghttp2_stream_dep_find_ancestor(stream, &session->root));
-    CU_ASSERT(nghttp2_stream_in_dep_tree(stream));
+    assert_true(nghttp2_stream_dep_find_ancestor(stream, &session->root));
+    assert_true(nghttp2_stream_in_dep_tree(stream));
   }
 
   nghttp2_session_del(session);
@@ -10031,7 +10298,7 @@ void test_nghttp2_session_graceful_shutdown(void) {
   my_user_data ud;
 
   memset(&callbacks, 0, sizeof(callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
   callbacks.on_frame_send_callback = on_frame_send_callback;
   callbacks.on_stream_close_callback = on_stream_close_callback;
 
@@ -10043,44 +10310,46 @@ void test_nghttp2_session_graceful_shutdown(void) {
   open_recv_stream(session, 311);
   open_recv_stream(session, 319);
 
-  CU_ASSERT(0 == nghttp2_submit_shutdown_notice(session));
+  assert_int(0, ==, nghttp2_submit_shutdown_notice(session));
 
   ud.frame_send_cb_called = 0;
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
 
-  CU_ASSERT(1 == ud.frame_send_cb_called);
-  CU_ASSERT((1u << 31) - 1 == session->local_last_stream_id);
+  assert_int(1, ==, ud.frame_send_cb_called);
+  assert_int32((1u << 31) - 1, ==, session->local_last_stream_id);
 
-  CU_ASSERT(0 == nghttp2_submit_goaway(session, NGHTTP2_FLAG_NONE, 311,
-                                       NGHTTP2_NO_ERROR, NULL, 0));
+  assert_int(0, ==,
+             nghttp2_submit_goaway(session, NGHTTP2_FLAG_NONE, 311,
+                                   NGHTTP2_NO_ERROR, NULL, 0));
 
   ud.frame_send_cb_called = 0;
   ud.stream_close_cb_called = 0;
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
 
-  CU_ASSERT(1 == ud.frame_send_cb_called);
-  CU_ASSERT(311 == session->local_last_stream_id);
-  CU_ASSERT(1 == ud.stream_close_cb_called);
+  assert_int(1, ==, ud.frame_send_cb_called);
+  assert_int32(311, ==, session->local_last_stream_id);
+  assert_int(1, ==, ud.stream_close_cb_called);
 
-  CU_ASSERT(0 ==
-            nghttp2_session_terminate_session2(session, 301, NGHTTP2_NO_ERROR));
+  assert_int(
+      0, ==,
+      nghttp2_session_terminate_session2(session, 301, NGHTTP2_NO_ERROR));
 
   ud.frame_send_cb_called = 0;
   ud.stream_close_cb_called = 0;
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
 
-  CU_ASSERT(1 == ud.frame_send_cb_called);
-  CU_ASSERT(301 == session->local_last_stream_id);
-  CU_ASSERT(2 == ud.stream_close_cb_called);
+  assert_int(1, ==, ud.frame_send_cb_called);
+  assert_int32(301, ==, session->local_last_stream_id);
+  assert_int(2, ==, ud.stream_close_cb_called);
 
-  CU_ASSERT(NULL != nghttp2_session_get_stream(session, 301));
-  CU_ASSERT(NULL != nghttp2_session_get_stream(session, 302));
-  CU_ASSERT(NULL == nghttp2_session_get_stream(session, 309));
-  CU_ASSERT(NULL == nghttp2_session_get_stream(session, 311));
-  CU_ASSERT(NULL == nghttp2_session_get_stream(session, 319));
+  assert_not_null(nghttp2_session_get_stream(session, 301));
+  assert_not_null(nghttp2_session_get_stream(session, 302));
+  assert_null(nghttp2_session_get_stream(session, 309));
+  assert_null(nghttp2_session_get_stream(session, 311));
+  assert_null(nghttp2_session_get_stream(session, 319));
 
   nghttp2_session_del(session);
 }
@@ -10095,7 +10364,7 @@ void test_nghttp2_session_on_header_temporal_failure(void) {
   nghttp2_nv nv[] = {MAKE_NV("alpha", "bravo"), MAKE_NV("charlie", "delta")};
   nghttp2_nv *nva;
   size_t hdpos;
-  ssize_t rv;
+  nghttp2_ssize rv;
   nghttp2_frame frame;
   nghttp2_frame_hd hd;
   nghttp2_outbound_item *item;
@@ -10134,18 +10403,18 @@ void test_nghttp2_session_on_header_temporal_failure(void) {
   nghttp2_frame_pack_frame_hd(&buf->pos[hdpos], &hd);
 
   ud.header_cb_called = 0;
-  rv = nghttp2_session_mem_recv(session, buf->pos, nghttp2_bufs_len(&bufs));
+  rv = nghttp2_session_mem_recv2(session, buf->pos, nghttp2_bufs_len(&bufs));
 
-  CU_ASSERT((ssize_t)nghttp2_bufs_len(&bufs) == rv);
-  CU_ASSERT(1 == ud.header_cb_called);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_bufs_len(&bufs), ==, rv);
+  assert_int(1, ==, ud.header_cb_called);
 
   item = nghttp2_session_get_next_ob_item(session);
 
-  CU_ASSERT(NGHTTP2_RST_STREAM == item->frame.hd.type);
-  CU_ASSERT(1 == item->frame.hd.stream_id);
+  assert_uint8(NGHTTP2_RST_STREAM, ==, item->frame.hd.type);
+  assert_int32(1, ==, item->frame.hd.stream_id);
 
   /* Make sure no header decompression error occurred */
-  CU_ASSERT(NGHTTP2_GOAWAY_NONE == session->goaway_flags);
+  assert_uint8(NGHTTP2_GOAWAY_NONE, ==, session->goaway_flags);
 
   nghttp2_hd_deflate_free(&deflater);
   nghttp2_session_del(session);
@@ -10160,18 +10429,18 @@ void test_nghttp2_session_on_header_temporal_failure(void) {
 
   rv = pack_push_promise(&bufs, &deflater, 1, NGHTTP2_FLAG_END_HEADERS, 2,
                          reqnv, ARRLEN(reqnv), mem);
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   ud.header_cb_called = 0;
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_bufs_len(&bufs));
-  CU_ASSERT((ssize_t)nghttp2_bufs_len(&bufs) == rv);
-  CU_ASSERT(1 == ud.header_cb_called);
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_bufs_len(&bufs));
+  assert_ptrdiff((nghttp2_ssize)nghttp2_bufs_len(&bufs), ==, rv);
+  assert_int(1, ==, ud.header_cb_called);
 
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(NGHTTP2_RST_STREAM == item->frame.hd.type);
-  CU_ASSERT(2 == item->frame.hd.stream_id);
-  CU_ASSERT(NGHTTP2_INTERNAL_ERROR == item->frame.rst_stream.error_code);
+  assert_uint8(NGHTTP2_RST_STREAM, ==, item->frame.hd.type);
+  assert_int32(2, ==, item->frame.hd.stream_id);
+  assert_uint32(NGHTTP2_INTERNAL_ERROR, ==, item->frame.rst_stream.error_code);
 
   nghttp2_session_del(session);
   nghttp2_hd_deflate_free(&deflater);
@@ -10181,7 +10450,7 @@ void test_nghttp2_session_on_header_temporal_failure(void) {
 void test_nghttp2_session_recv_client_magic(void) {
   nghttp2_session *session;
   nghttp2_session_callbacks callbacks;
-  ssize_t rv;
+  nghttp2_ssize rv;
   nghttp2_frame ping_frame;
   uint8_t buf[16];
 
@@ -10193,21 +10462,23 @@ void test_nghttp2_session_recv_client_magic(void) {
   /* Check success case */
   nghttp2_session_server_new(&session, &callbacks, NULL);
 
-  rv = nghttp2_session_mem_recv(session, (const uint8_t *)NGHTTP2_CLIENT_MAGIC,
-                                NGHTTP2_CLIENT_MAGIC_LEN);
+  rv = nghttp2_session_mem_recv2(session, (const uint8_t *)NGHTTP2_CLIENT_MAGIC,
+                                 NGHTTP2_CLIENT_MAGIC_LEN);
 
-  CU_ASSERT(rv == NGHTTP2_CLIENT_MAGIC_LEN);
-  CU_ASSERT(NGHTTP2_IB_READ_FIRST_SETTINGS == session->iframe.state);
+  assert_ptrdiff(NGHTTP2_CLIENT_MAGIC_LEN, ==, rv);
+  assert_enum(nghttp2_inbound_state, NGHTTP2_IB_READ_FIRST_SETTINGS, ==,
+              session->iframe.state);
 
   /* Receiving PING is error because we want SETTINGS. */
   nghttp2_frame_ping_init(&ping_frame.ping, NGHTTP2_FLAG_NONE, NULL);
 
   nghttp2_frame_pack_frame_hd(buf, &ping_frame.ping.hd);
 
-  rv = nghttp2_session_mem_recv(session, buf, NGHTTP2_FRAME_HDLEN);
-  CU_ASSERT(NGHTTP2_FRAME_HDLEN == rv);
-  CU_ASSERT(NGHTTP2_IB_IGN_ALL == session->iframe.state);
-  CU_ASSERT(0 == session->iframe.payloadleft);
+  rv = nghttp2_session_mem_recv2(session, buf, NGHTTP2_FRAME_HDLEN);
+  assert_ptrdiff(NGHTTP2_FRAME_HDLEN, ==, rv);
+  assert_enum(nghttp2_inbound_state, NGHTTP2_IB_IGN_ALL, ==,
+              session->iframe.state);
+  assert_size(0, ==, session->iframe.payloadleft);
 
   nghttp2_frame_ping_free(&ping_frame.ping);
 
@@ -10217,16 +10488,17 @@ void test_nghttp2_session_recv_client_magic(void) {
   nghttp2_session_server_new(&session, &callbacks, NULL);
 
   /* Feed magic with one byte less */
-  rv = nghttp2_session_mem_recv(session, (const uint8_t *)NGHTTP2_CLIENT_MAGIC,
-                                NGHTTP2_CLIENT_MAGIC_LEN - 1);
+  rv = nghttp2_session_mem_recv2(session, (const uint8_t *)NGHTTP2_CLIENT_MAGIC,
+                                 NGHTTP2_CLIENT_MAGIC_LEN - 1);
 
-  CU_ASSERT(rv == NGHTTP2_CLIENT_MAGIC_LEN - 1);
-  CU_ASSERT(NGHTTP2_IB_READ_CLIENT_MAGIC == session->iframe.state);
-  CU_ASSERT(1 == session->iframe.payloadleft);
+  assert_ptrdiff(NGHTTP2_CLIENT_MAGIC_LEN - 1, ==, rv);
+  assert_enum(nghttp2_inbound_state, NGHTTP2_IB_READ_CLIENT_MAGIC, ==,
+              session->iframe.state);
+  assert_size(1, ==, session->iframe.payloadleft);
 
-  rv = nghttp2_session_mem_recv(session, (const uint8_t *)"\0", 1);
+  rv = nghttp2_session_mem_recv2(session, (const uint8_t *)"\0", 1);
 
-  CU_ASSERT(NGHTTP2_ERR_BAD_CLIENT_MAGIC == rv);
+  assert_ptrdiff(NGHTTP2_ERR_BAD_CLIENT_MAGIC, ==, rv);
 
   nghttp2_session_del(session);
 
@@ -10238,7 +10510,7 @@ void test_nghttp2_session_delete_data_item(void) {
   nghttp2_session *session;
   nghttp2_session_callbacks callbacks;
   nghttp2_stream *a;
-  nghttp2_data_provider prd;
+  nghttp2_data_provider2 prd;
 
   memset(&callbacks, 0, sizeof(callbacks));
 
@@ -10251,8 +10523,8 @@ void test_nghttp2_session_delete_data_item(void) {
   prd.source.ptr = NULL;
   prd.read_callback = fail_data_source_read_callback;
 
-  CU_ASSERT(0 == nghttp2_submit_data(session, NGHTTP2_FLAG_NONE, 1, &prd));
-  CU_ASSERT(0 == nghttp2_submit_data(session, NGHTTP2_FLAG_NONE, 3, &prd));
+  assert_int(0, ==, nghttp2_submit_data2(session, NGHTTP2_FLAG_NONE, 1, &prd));
+  assert_int(0, ==, nghttp2_submit_data2(session, NGHTTP2_FLAG_NONE, 3, &prd));
 
   nghttp2_session_del(session);
 }
@@ -10273,24 +10545,24 @@ void test_nghttp2_session_open_idle_stream(void) {
 
   nghttp2_frame_priority_init(&frame.priority, 1, &pri_spec);
 
-  CU_ASSERT(0 == nghttp2_session_on_priority_received(session, &frame));
+  assert_int(0, ==, nghttp2_session_on_priority_received(session, &frame));
 
   stream = nghttp2_session_get_stream_raw(session, 1);
 
-  CU_ASSERT(NGHTTP2_STREAM_IDLE == stream->state);
-  CU_ASSERT(NULL == stream->closed_prev);
-  CU_ASSERT(NULL == stream->closed_next);
-  CU_ASSERT(1 == session->num_idle_streams);
-  CU_ASSERT(session->idle_stream_head == stream);
-  CU_ASSERT(session->idle_stream_tail == stream);
+  assert_enum(nghttp2_stream_state, NGHTTP2_STREAM_IDLE, ==, stream->state);
+  assert_null(stream->closed_prev);
+  assert_null(stream->closed_next);
+  assert_size(1, ==, session->num_idle_streams);
+  assert_ptr_equal(session->idle_stream_head, stream);
+  assert_ptr_equal(session->idle_stream_tail, stream);
 
   opened_stream = open_recv_stream2(session, 1, NGHTTP2_STREAM_OPENING);
 
-  CU_ASSERT(stream == opened_stream);
-  CU_ASSERT(NGHTTP2_STREAM_OPENING == stream->state);
-  CU_ASSERT(0 == session->num_idle_streams);
-  CU_ASSERT(NULL == session->idle_stream_head);
-  CU_ASSERT(NULL == session->idle_stream_tail);
+  assert_ptr_equal(stream, opened_stream);
+  assert_enum(nghttp2_stream_state, NGHTTP2_STREAM_OPENING, ==, stream->state);
+  assert_size(0, ==, session->num_idle_streams);
+  assert_null(session->idle_stream_head);
+  assert_null(session->idle_stream_tail);
 
   nghttp2_frame_priority_free(&frame.priority);
 
@@ -10307,13 +10579,13 @@ void test_nghttp2_session_cancel_reserved_remote(void) {
   nghttp2_hd_deflater deflater;
   nghttp2_mem *mem;
   nghttp2_bufs bufs;
-  ssize_t rv;
+  nghttp2_ssize rv;
 
   mem = nghttp2_mem_default();
   frame_pack_bufs_init(&bufs);
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   nghttp2_session_client_new(&session, &callbacks, NULL);
 
@@ -10323,9 +10595,9 @@ void test_nghttp2_session_cancel_reserved_remote(void) {
 
   nghttp2_submit_rst_stream(session, NGHTTP2_FLAG_NONE, 2, NGHTTP2_CANCEL);
 
-  CU_ASSERT(NGHTTP2_STREAM_CLOSING == stream->state);
+  assert_enum(nghttp2_stream_state, NGHTTP2_STREAM_CLOSING, ==, stream->state);
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
 
   nvlen = ARRLEN(resnv);
   nghttp2_nv_array_copy(&nva, resnv, nvlen, mem);
@@ -10334,19 +10606,19 @@ void test_nghttp2_session_cancel_reserved_remote(void) {
                              NGHTTP2_HCAT_PUSH_RESPONSE, NULL, nva, nvlen);
   rv = nghttp2_frame_pack_headers(&bufs, &frame.headers, &deflater);
 
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_buf_len(&bufs.head->buf));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_buf_len(&bufs.head->buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&bufs.head->buf) == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&bufs.head->buf), ==, rv);
 
   /* stream is not dangling, so assign NULL */
   stream = NULL;
 
   /* No RST_STREAM or GOAWAY is generated since stream should be in
      NGHTTP2_STREAM_CLOSING and push response should be ignored. */
-  CU_ASSERT(0 == nghttp2_outbound_queue_size(&session->ob_reg));
+  assert_size(0, ==, nghttp2_outbound_queue_size(&session->ob_reg));
 
   /* Check that we can receive push response HEADERS while RST_STREAM
      is just queued. */
@@ -10359,14 +10631,14 @@ void test_nghttp2_session_cancel_reserved_remote(void) {
   frame.hd.stream_id = 4;
   rv = nghttp2_frame_pack_headers(&bufs, &frame.headers, &deflater);
 
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_buf_len(&bufs.head->buf));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_buf_len(&bufs.head->buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&bufs.head->buf) == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&bufs.head->buf), ==, rv);
 
-  CU_ASSERT(1 == nghttp2_outbound_queue_size(&session->ob_reg));
+  assert_size(1, ==, nghttp2_outbound_queue_size(&session->ob_reg));
 
   nghttp2_frame_headers_free(&frame.headers, mem);
 
@@ -10385,15 +10657,15 @@ void test_nghttp2_session_reset_pending_headers(void) {
   my_user_data ud;
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
   callbacks.on_frame_send_callback = on_frame_send_callback;
   callbacks.on_frame_not_send_callback = on_frame_not_send_callback;
   callbacks.on_stream_close_callback = on_stream_close_callback;
 
   nghttp2_session_client_new(&session, &callbacks, &ud);
 
-  stream_id = nghttp2_submit_request(session, NULL, NULL, 0, NULL, NULL);
-  CU_ASSERT(stream_id >= 1);
+  stream_id = nghttp2_submit_request2(session, NULL, NULL, 0, NULL, NULL);
+  assert_int32(1, <=, stream_id);
 
   nghttp2_submit_rst_stream(session, NGHTTP2_FLAG_NONE, stream_id,
                             NGHTTP2_CANCEL);
@@ -10402,13 +10674,13 @@ void test_nghttp2_session_reset_pending_headers(void) {
 
   /* RST_STREAM cancels pending HEADERS and is not actually sent. */
   ud.frame_send_cb_called = 0;
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
 
-  CU_ASSERT(0 == ud.frame_send_cb_called);
+  assert_int(0, ==, ud.frame_send_cb_called);
 
   stream = nghttp2_session_get_stream(session, stream_id);
 
-  CU_ASSERT(NULL == stream);
+  assert_null(stream);
 
   /* See HEADERS is not sent.  on_stream_close is called just like
      transmission failure. */
@@ -10416,15 +10688,15 @@ void test_nghttp2_session_reset_pending_headers(void) {
 
   ud.frame_not_send_cb_called = 0;
   ud.stream_close_error_code = 0;
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
 
-  CU_ASSERT(1 == ud.frame_not_send_cb_called);
-  CU_ASSERT(NGHTTP2_HEADERS == ud.not_sent_frame_type);
-  CU_ASSERT(NGHTTP2_CANCEL == ud.stream_close_error_code);
+  assert_int(1, ==, ud.frame_not_send_cb_called);
+  assert_uint8(NGHTTP2_HEADERS, ==, ud.not_sent_frame_type);
+  assert_uint32(NGHTTP2_CANCEL, ==, ud.stream_close_error_code);
 
   stream = nghttp2_session_get_stream(session, stream_id);
 
-  CU_ASSERT(NULL == stream);
+  assert_null(stream);
 
   nghttp2_session_del(session);
 }
@@ -10432,13 +10704,13 @@ void test_nghttp2_session_reset_pending_headers(void) {
 void test_nghttp2_session_send_data_callback(void) {
   nghttp2_session *session;
   nghttp2_session_callbacks callbacks;
-  nghttp2_data_provider data_prd;
+  nghttp2_data_provider2 data_prd;
   my_user_data ud;
   accumulator acc;
   nghttp2_frame_hd hd;
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = accumulator_send_callback;
+  callbacks.send_callback2 = accumulator_send_callback;
   callbacks.send_data_callback = send_data_callback;
 
   data_prd.read_callback = no_copy_data_source_read_callback;
@@ -10452,23 +10724,24 @@ void test_nghttp2_session_send_data_callback(void) {
 
   open_sent_stream(session, 1);
 
-  nghttp2_submit_data(session, NGHTTP2_FLAG_END_STREAM, 1, &data_prd);
+  nghttp2_submit_data2(session, NGHTTP2_FLAG_END_STREAM, 1, &data_prd);
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
 
-  CU_ASSERT((NGHTTP2_FRAME_HDLEN + NGHTTP2_DATA_PAYLOADLEN) * 2 == acc.length);
+  assert_size((NGHTTP2_FRAME_HDLEN + NGHTTP2_DATA_PAYLOADLEN) * 2, ==,
+              acc.length);
 
   nghttp2_frame_unpack_frame_hd(&hd, acc.buf);
 
-  CU_ASSERT(16384 == hd.length);
-  CU_ASSERT(NGHTTP2_DATA == hd.type);
-  CU_ASSERT(NGHTTP2_FLAG_NONE == hd.flags);
+  assert_size(16384, ==, hd.length);
+  assert_uint8(NGHTTP2_DATA, ==, hd.type);
+  assert_uint8(NGHTTP2_FLAG_NONE, ==, hd.flags);
 
   nghttp2_frame_unpack_frame_hd(&hd, acc.buf + NGHTTP2_FRAME_HDLEN + hd.length);
 
-  CU_ASSERT(16384 == hd.length);
-  CU_ASSERT(NGHTTP2_DATA == hd.type);
-  CU_ASSERT(NGHTTP2_FLAG_END_STREAM == hd.flags);
+  assert_size(16384, ==, hd.length);
+  assert_uint8(NGHTTP2_DATA, ==, hd.type);
+  assert_uint8(NGHTTP2_FLAG_END_STREAM, ==, hd.flags);
 
   nghttp2_session_del(session);
 }
@@ -10479,7 +10752,7 @@ void test_nghttp2_session_on_begin_headers_temporal_failure(void) {
   my_user_data ud;
   nghttp2_bufs bufs;
   nghttp2_mem *mem;
-  ssize_t rv;
+  nghttp2_ssize rv;
   nghttp2_hd_deflater deflater;
   nghttp2_outbound_item *item;
 
@@ -10492,25 +10765,25 @@ void test_nghttp2_session_on_begin_headers_temporal_failure(void) {
       temporal_failure_on_begin_headers_callback;
   callbacks.on_header_callback = on_header_callback;
   callbacks.on_frame_recv_callback = on_frame_recv_callback;
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
   nghttp2_session_server_new(&session, &callbacks, &ud);
 
   rv = pack_headers(&bufs, &deflater, 1, NGHTTP2_FLAG_END_HEADERS, reqnv,
                     ARRLEN(reqnv), mem);
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   ud.header_cb_called = 0;
   ud.frame_recv_cb_called = 0;
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_bufs_len(&bufs));
-  CU_ASSERT((ssize_t)nghttp2_bufs_len(&bufs) == rv);
-  CU_ASSERT(0 == ud.header_cb_called);
-  CU_ASSERT(0 == ud.frame_recv_cb_called);
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_bufs_len(&bufs));
+  assert_ptrdiff((nghttp2_ssize)nghttp2_bufs_len(&bufs), ==, rv);
+  assert_int(0, ==, ud.header_cb_called);
+  assert_int(0, ==, ud.frame_recv_cb_called);
 
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(NGHTTP2_RST_STREAM == item->frame.hd.type);
-  CU_ASSERT(1 == item->frame.hd.stream_id);
-  CU_ASSERT(NGHTTP2_INTERNAL_ERROR == item->frame.rst_stream.error_code);
+  assert_uint8(NGHTTP2_RST_STREAM, ==, item->frame.hd.type);
+  assert_int32(1, ==, item->frame.hd.stream_id);
+  assert_uint32(NGHTTP2_INTERNAL_ERROR, ==, item->frame.rst_stream.error_code);
 
   nghttp2_session_del(session);
   nghttp2_hd_deflate_free(&deflater);
@@ -10524,20 +10797,20 @@ void test_nghttp2_session_on_begin_headers_temporal_failure(void) {
 
   rv = pack_push_promise(&bufs, &deflater, 1, NGHTTP2_FLAG_END_HEADERS, 2,
                          reqnv, ARRLEN(reqnv), mem);
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   ud.header_cb_called = 0;
   ud.frame_recv_cb_called = 0;
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_bufs_len(&bufs));
-  CU_ASSERT((ssize_t)nghttp2_bufs_len(&bufs) == rv);
-  CU_ASSERT(0 == ud.header_cb_called);
-  CU_ASSERT(0 == ud.frame_recv_cb_called);
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_bufs_len(&bufs));
+  assert_ptrdiff((nghttp2_ssize)nghttp2_bufs_len(&bufs), ==, rv);
+  assert_int(0, ==, ud.header_cb_called);
+  assert_int(0, ==, ud.frame_recv_cb_called);
 
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(NGHTTP2_RST_STREAM == item->frame.hd.type);
-  CU_ASSERT(2 == item->frame.hd.stream_id);
-  CU_ASSERT(NGHTTP2_INTERNAL_ERROR == item->frame.rst_stream.error_code);
+  assert_uint8(NGHTTP2_RST_STREAM, ==, item->frame.hd.type);
+  assert_int32(2, ==, item->frame.hd.stream_id);
+  assert_uint32(NGHTTP2_INTERNAL_ERROR, ==, item->frame.rst_stream.error_code);
 
   nghttp2_session_del(session);
   nghttp2_hd_deflate_free(&deflater);
@@ -10547,38 +10820,38 @@ void test_nghttp2_session_on_begin_headers_temporal_failure(void) {
 void test_nghttp2_session_defer_then_close(void) {
   nghttp2_session *session;
   nghttp2_session_callbacks callbacks;
-  nghttp2_data_provider prd;
+  nghttp2_data_provider2 prd;
   int rv;
   const uint8_t *datap;
-  ssize_t datalen;
+  nghttp2_ssize datalen;
   nghttp2_frame frame;
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   nghttp2_session_client_new(&session, &callbacks, NULL);
 
   prd.read_callback = defer_data_source_read_callback;
 
-  rv = nghttp2_submit_request(session, NULL, reqnv, ARRLEN(reqnv), &prd, NULL);
-  CU_ASSERT(rv > 0);
+  rv = nghttp2_submit_request2(session, NULL, reqnv, ARRLEN(reqnv), &prd, NULL);
+  assert_ptrdiff(0, <, rv);
 
   /* This sends HEADERS */
-  datalen = nghttp2_session_mem_send(session, &datap);
+  datalen = nghttp2_session_mem_send2(session, &datap);
 
-  CU_ASSERT(datalen > 0);
+  assert_ptrdiff(0, <, datalen);
 
   /* This makes DATA item deferred */
-  datalen = nghttp2_session_mem_send(session, &datap);
+  datalen = nghttp2_session_mem_send2(session, &datap);
 
-  CU_ASSERT(datalen == 0);
+  assert_ptrdiff(0, ==, datalen);
 
   nghttp2_frame_rst_stream_init(&frame.rst_stream, 1, NGHTTP2_CANCEL);
 
   /* Assertion failure; GH-264 */
   rv = nghttp2_session_on_rst_stream_received(session, &frame);
 
-  CU_ASSERT(rv == 0);
+  assert_int(0, ==, rv);
 
   nghttp2_session_del(session);
 }
@@ -10587,7 +10860,7 @@ static int submit_response_on_stream_close(nghttp2_session *session,
                                            int32_t stream_id,
                                            uint32_t error_code,
                                            void *user_data) {
-  nghttp2_data_provider data_prd;
+  nghttp2_data_provider2 data_prd;
   (void)error_code;
   (void)user_data;
 
@@ -10596,12 +10869,14 @@ static int submit_response_on_stream_close(nghttp2_session *session,
   // Attempt to submit response or data to the stream being closed
   switch (stream_id) {
   case 1:
-    CU_ASSERT(0 == nghttp2_submit_response(session, stream_id, resnv,
-                                           ARRLEN(resnv), &data_prd));
+    assert_int(0, ==,
+               nghttp2_submit_response2(session, stream_id, resnv,
+                                        ARRLEN(resnv), &data_prd));
     break;
   case 3:
-    CU_ASSERT(0 == nghttp2_submit_data(session, NGHTTP2_FLAG_NONE, stream_id,
-                                       &data_prd));
+    assert_int(
+        0, ==,
+        nghttp2_submit_data2(session, NGHTTP2_FLAG_NONE, stream_id, &data_prd));
     break;
   }
 
@@ -10614,7 +10889,7 @@ void test_nghttp2_session_detach_item_from_closed_stream(void) {
 
   memset(&callbacks, 0, sizeof(callbacks));
 
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
   callbacks.on_stream_close_callback = submit_response_on_stream_close;
 
   nghttp2_session_server_new(&session, &callbacks, NULL);
@@ -10625,7 +10900,7 @@ void test_nghttp2_session_detach_item_from_closed_stream(void) {
   nghttp2_session_close_stream(session, 1, NGHTTP2_NO_ERROR);
   nghttp2_session_close_stream(session, 3, NGHTTP2_NO_ERROR);
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
 
   nghttp2_session_del(session);
 }
@@ -10655,13 +10930,14 @@ void test_nghttp2_session_flooding(void) {
   buf = &bufs.head->buf;
 
   for (i = 0; i < NGHTTP2_DEFAULT_MAX_OBQ_FLOOD_ITEM; ++i) {
-    CU_ASSERT(
-        (ssize_t)nghttp2_buf_len(buf) ==
-        nghttp2_session_mem_recv(session, buf->pos, nghttp2_buf_len(buf)));
+    assert_ptrdiff(
+        (nghttp2_ssize)nghttp2_buf_len(buf), ==,
+        nghttp2_session_mem_recv2(session, buf->pos, nghttp2_buf_len(buf)));
   }
 
-  CU_ASSERT(NGHTTP2_ERR_FLOODED ==
-            nghttp2_session_mem_recv(session, buf->pos, nghttp2_buf_len(buf)));
+  assert_ptrdiff(
+      NGHTTP2_ERR_FLOODED, ==,
+      nghttp2_session_mem_recv2(session, buf->pos, nghttp2_buf_len(buf)));
 
   nghttp2_session_del(session);
 
@@ -10677,13 +10953,14 @@ void test_nghttp2_session_flooding(void) {
   buf = &bufs.head->buf;
 
   for (i = 0; i < NGHTTP2_DEFAULT_MAX_OBQ_FLOOD_ITEM; ++i) {
-    CU_ASSERT(
-        (ssize_t)nghttp2_buf_len(buf) ==
-        nghttp2_session_mem_recv(session, buf->pos, nghttp2_buf_len(buf)));
+    assert_ptrdiff(
+        (nghttp2_ssize)nghttp2_buf_len(buf), ==,
+        nghttp2_session_mem_recv2(session, buf->pos, nghttp2_buf_len(buf)));
   }
 
-  CU_ASSERT(NGHTTP2_ERR_FLOODED ==
-            nghttp2_session_mem_recv(session, buf->pos, nghttp2_buf_len(buf)));
+  assert_ptrdiff(
+      NGHTTP2_ERR_FLOODED, ==,
+      nghttp2_session_mem_recv2(session, buf->pos, nghttp2_buf_len(buf)));
 
   nghttp2_session_del(session);
   nghttp2_bufs_free(&bufs);
@@ -10708,22 +10985,22 @@ void test_nghttp2_session_change_stream_priority(void) {
 
   rv = nghttp2_session_change_stream_priority(session, 2, &pri_spec);
 
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
-  CU_ASSERT(stream1 == stream2->dep_prev);
-  CU_ASSERT(256 == stream2->weight);
+  assert_ptr_equal(stream1, stream2->dep_prev);
+  assert_int32(256, ==, stream2->weight);
 
   /* Cannot change stream which does not exist */
   rv = nghttp2_session_change_stream_priority(session, 5, &pri_spec);
-  CU_ASSERT(NGHTTP2_ERR_INVALID_ARGUMENT == rv);
+  assert_int(NGHTTP2_ERR_INVALID_ARGUMENT, ==, rv);
 
   /* It is an error to depend on itself */
   rv = nghttp2_session_change_stream_priority(session, 1, &pri_spec);
-  CU_ASSERT(NGHTTP2_ERR_INVALID_ARGUMENT == rv);
+  assert_int(NGHTTP2_ERR_INVALID_ARGUMENT, ==, rv);
 
   /* It is an error to change priority of root stream (0) */
   rv = nghttp2_session_change_stream_priority(session, 0, &pri_spec);
-  CU_ASSERT(NGHTTP2_ERR_INVALID_ARGUMENT == rv);
+  assert_int(NGHTTP2_ERR_INVALID_ARGUMENT, ==, rv);
 
   /* Depends on the non-existing idle stream.  This creates that idle
      stream. */
@@ -10731,14 +11008,14 @@ void test_nghttp2_session_change_stream_priority(void) {
 
   rv = nghttp2_session_change_stream_priority(session, 2, &pri_spec);
 
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   stream5 = nghttp2_session_get_stream_raw(session, 5);
 
-  CU_ASSERT(NULL != stream5);
-  CU_ASSERT(&session->root == stream5->dep_prev);
-  CU_ASSERT(stream5 == stream2->dep_prev);
-  CU_ASSERT(9 == stream2->weight);
+  assert_not_null(stream5);
+  assert_ptr_equal(&session->root, stream5->dep_prev);
+  assert_ptr_equal(stream5, stream2->dep_prev);
+  assert_int32(9, ==, stream2->weight);
 
   nghttp2_session_del(session);
 
@@ -10751,14 +11028,14 @@ void test_nghttp2_session_change_stream_priority(void) {
 
   rv = nghttp2_session_change_stream_priority(session, 1, &pri_spec);
 
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   stream5 = nghttp2_session_get_stream_raw(session, 5);
 
-  CU_ASSERT(NULL != stream5);
-  CU_ASSERT(&session->root == stream5->dep_prev);
-  CU_ASSERT(stream5 == stream1->dep_prev);
-  CU_ASSERT(9 == stream1->weight);
+  assert_not_null(stream5);
+  assert_ptr_equal(&session->root, stream5->dep_prev);
+  assert_ptr_equal(stream5, stream1->dep_prev);
+  assert_int32(9, ==, stream1->weight);
 
   nghttp2_session_del(session);
 }
@@ -10768,7 +11045,7 @@ void test_nghttp2_session_change_extpri_stream_priority(void) {
   nghttp2_session_callbacks callbacks;
   nghttp2_bufs bufs;
   nghttp2_buf *buf;
-  ssize_t rv;
+  nghttp2_ssize rv;
   nghttp2_option *option;
   nghttp2_extension frame;
   nghttp2_ext_priority_update priority_update;
@@ -10796,19 +11073,19 @@ void test_nghttp2_session_change_extpri_stream_priority(void) {
   rv = nghttp2_session_change_extpri_stream_priority(
       session, 1, &extpri, /* ignore_client_signal = */ 0);
 
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   stream = nghttp2_session_get_stream(session, 1);
 
-  CU_ASSERT(NGHTTP2_EXTPRI_URGENCY_LOW ==
-            nghttp2_extpri_uint8_urgency(stream->extpri));
-  CU_ASSERT(1 == nghttp2_extpri_uint8_inc(stream->extpri));
+  assert_uint32(NGHTTP2_EXTPRI_URGENCY_LOW, ==,
+                nghttp2_extpri_uint8_urgency(stream->extpri));
+  assert_true(nghttp2_extpri_uint8_inc(stream->extpri));
 
   rv = nghttp2_session_get_extpri_stream_priority(session, &nextpri, 1);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(NGHTTP2_EXTPRI_URGENCY_LOW == nextpri.urgency);
-  CU_ASSERT(1 == nextpri.inc);
+  assert_ptrdiff(0, ==, rv);
+  assert_uint32(NGHTTP2_EXTPRI_URGENCY_LOW, ==, nextpri.urgency);
+  assert_true(nextpri.inc);
 
   /* Client can still update stream priority. */
   frame.payload = &priority_update;
@@ -10817,30 +11094,30 @@ void test_nghttp2_session_change_extpri_stream_priority(void) {
   nghttp2_frame_pack_priority_update(&bufs, &frame);
 
   buf = &bufs.head->buf;
-  rv = nghttp2_session_mem_recv(session, buf->pos, nghttp2_buf_len(buf));
+  rv = nghttp2_session_mem_recv2(session, buf->pos, nghttp2_buf_len(buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(buf) == rv);
-  CU_ASSERT(2 == stream->extpri);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(buf), ==, rv);
+  assert_uint8(2, ==, stream->extpri);
 
   /* Start to ignore client priority signal for this stream. */
   rv = nghttp2_session_change_extpri_stream_priority(
       session, 1, &extpri, /* ignore_client_signal = */ 1);
 
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   stream = nghttp2_session_get_stream(session, 1);
 
-  CU_ASSERT(NGHTTP2_EXTPRI_URGENCY_LOW ==
-            nghttp2_extpri_uint8_urgency(stream->extpri));
-  CU_ASSERT(1 == nghttp2_extpri_uint8_inc(stream->extpri));
+  assert_uint32(NGHTTP2_EXTPRI_URGENCY_LOW, ==,
+                nghttp2_extpri_uint8_urgency(stream->extpri));
+  assert_true(nghttp2_extpri_uint8_inc(stream->extpri));
 
   buf = &bufs.head->buf;
-  rv = nghttp2_session_mem_recv(session, buf->pos, nghttp2_buf_len(buf));
+  rv = nghttp2_session_mem_recv2(session, buf->pos, nghttp2_buf_len(buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(buf) == rv);
-  CU_ASSERT(NGHTTP2_EXTPRI_URGENCY_LOW ==
-            nghttp2_extpri_uint8_urgency(stream->extpri));
-  CU_ASSERT(1 == nghttp2_extpri_uint8_inc(stream->extpri));
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(buf), ==, rv);
+  assert_uint32(NGHTTP2_EXTPRI_URGENCY_LOW, ==,
+                nghttp2_extpri_uint8_urgency(stream->extpri));
+  assert_true(nghttp2_extpri_uint8_inc(stream->extpri));
 
   nghttp2_session_del(session);
   nghttp2_option_del(option);
@@ -10856,7 +11133,7 @@ void test_nghttp2_session_create_idle_stream(void) {
   int i;
 
   memset(&callbacks, 0, sizeof(callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   nghttp2_session_server_new(&session, &callbacks, NULL);
 
@@ -10866,14 +11143,14 @@ void test_nghttp2_session_create_idle_stream(void) {
 
   rv = nghttp2_session_create_idle_stream(session, 4, &pri_spec);
 
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   stream4 = nghttp2_session_get_stream_raw(session, 4);
 
-  CU_ASSERT(4 == stream4->stream_id);
-  CU_ASSERT(111 == stream4->weight);
-  CU_ASSERT(stream2 == stream4->dep_prev);
-  CU_ASSERT(stream4 == stream2->dep_next);
+  assert_int32(4, ==, stream4->stream_id);
+  assert_int32(111, ==, stream4->weight);
+  assert_ptr_equal(stream2, stream4->dep_prev);
+  assert_ptr_equal(stream4, stream2->dep_next);
 
   /* If pri_spec->stream_id does not exist, and it is idle stream, it
      is created too */
@@ -10881,33 +11158,33 @@ void test_nghttp2_session_create_idle_stream(void) {
 
   rv = nghttp2_session_create_idle_stream(session, 8, &pri_spec);
 
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   stream8 = nghttp2_session_get_stream_raw(session, 8);
   stream10 = nghttp2_session_get_stream_raw(session, 10);
 
-  CU_ASSERT(8 == stream8->stream_id);
-  CU_ASSERT(109 == stream8->weight);
-  CU_ASSERT(10 == stream10->stream_id);
-  CU_ASSERT(16 == stream10->weight);
-  CU_ASSERT(stream10 == stream8->dep_prev);
-  CU_ASSERT(&session->root == stream10->dep_prev);
+  assert_int32(8, ==, stream8->stream_id);
+  assert_int32(109, ==, stream8->weight);
+  assert_int32(10, ==, stream10->stream_id);
+  assert_int32(16, ==, stream10->weight);
+  assert_ptr_equal(stream10, stream8->dep_prev);
+  assert_ptr_equal(&session->root, stream10->dep_prev);
 
   /* It is an error to attempt to create already existing idle
      stream */
   rv = nghttp2_session_create_idle_stream(session, 4, &pri_spec);
 
-  CU_ASSERT(NGHTTP2_ERR_INVALID_ARGUMENT == rv);
+  assert_int(NGHTTP2_ERR_INVALID_ARGUMENT, ==, rv);
 
   /* It is an error to depend on itself */
   pri_spec.stream_id = 6;
 
   rv = nghttp2_session_create_idle_stream(session, 6, &pri_spec);
-  CU_ASSERT(NGHTTP2_ERR_INVALID_ARGUMENT == rv);
+  assert_int(NGHTTP2_ERR_INVALID_ARGUMENT, ==, rv);
 
   /* It is an error to create root stream (0) as idle stream */
   rv = nghttp2_session_create_idle_stream(session, 0, &pri_spec);
-  CU_ASSERT(NGHTTP2_ERR_INVALID_ARGUMENT == rv);
+  assert_int(NGHTTP2_ERR_INVALID_ARGUMENT, ==, rv);
 
   /* It is an error to create non-idle stream */
   session->last_sent_stream_id = 20;
@@ -10915,7 +11192,7 @@ void test_nghttp2_session_create_idle_stream(void) {
 
   rv = nghttp2_session_create_idle_stream(session, 18, &pri_spec);
 
-  CU_ASSERT(NGHTTP2_ERR_INVALID_ARGUMENT == rv);
+  assert_int(NGHTTP2_ERR_INVALID_ARGUMENT, ==, rv);
 
   nghttp2_session_del(session);
 
@@ -10926,17 +11203,17 @@ void test_nghttp2_session_create_idle_stream(void) {
 
   rv = nghttp2_session_create_idle_stream(session, 2, &pri_spec);
 
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   stream4 = nghttp2_session_get_stream_raw(session, 4);
   stream2 = nghttp2_session_get_stream_raw(session, 2);
 
-  CU_ASSERT(NULL != stream4);
-  CU_ASSERT(NULL != stream2);
-  CU_ASSERT(&session->root == stream4->dep_prev);
-  CU_ASSERT(NGHTTP2_DEFAULT_WEIGHT == stream4->weight);
-  CU_ASSERT(stream4 == stream2->dep_prev);
-  CU_ASSERT(99 == stream2->weight);
+  assert_not_null(stream4);
+  assert_not_null(stream2);
+  assert_ptr_equal(&session->root, stream4->dep_prev);
+  assert_int32(NGHTTP2_DEFAULT_WEIGHT, ==, stream4->weight);
+  assert_ptr_equal(stream4, stream2->dep_prev);
+  assert_int32(99, ==, stream2->weight);
 
   nghttp2_session_del(session);
 
@@ -10950,19 +11227,19 @@ void test_nghttp2_session_create_idle_stream(void) {
   for (i = 0; i < 100; ++i) {
     rv = nghttp2_session_create_idle_stream(session, i * 2 + 1, &pri_spec);
 
-    CU_ASSERT(0 == rv);
+    assert_int(0, ==, rv);
 
     nghttp2_priority_spec_init(&pri_spec, i * 2 + 1, 16, 0);
   }
 
-  CU_ASSERT(100 == session->num_idle_streams);
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(30 == session->num_idle_streams);
-  CU_ASSERT(141 == session->idle_stream_head->stream_id);
+  assert_size(100, ==, session->num_idle_streams);
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_size(30, ==, session->num_idle_streams);
+  assert_int32(141, ==, session->idle_stream_head->stream_id);
 
   nghttp2_session_del(session);
 
-  /* Check that idle stream is reduced when nghttp2_session_mem_recv() is
+  /* Check that idle stream is reduced when nghttp2_session_mem_recv2() is
      called. */
   nghttp2_session_client_new(&session, &callbacks, NULL);
 
@@ -10972,15 +11249,15 @@ void test_nghttp2_session_create_idle_stream(void) {
   for (i = 0; i < 100; ++i) {
     rv = nghttp2_session_create_idle_stream(session, i * 2 + 1, &pri_spec);
 
-    CU_ASSERT(0 == rv);
+    assert_int(0, ==, rv);
 
     nghttp2_priority_spec_init(&pri_spec, i * 2 + 1, 16, 0);
   }
 
-  CU_ASSERT(100 == session->num_idle_streams);
-  CU_ASSERT(0 == nghttp2_session_mem_recv(session, NULL, 0));
-  CU_ASSERT(30 == session->num_idle_streams);
-  CU_ASSERT(141 == session->idle_stream_head->stream_id);
+  assert_size(100, ==, session->num_idle_streams);
+  assert_ptrdiff(0, ==, nghttp2_session_mem_recv2(session, NULL, 0));
+  assert_size(30, ==, session->num_idle_streams);
+  assert_int32(141, ==, session->idle_stream_head->stream_id);
 
   nghttp2_session_del(session);
 }
@@ -11003,7 +11280,7 @@ void test_nghttp2_session_repeated_priority_change(void) {
   nghttp2_priority_spec_init(&pri_spec, 0, 16, 0);
   nghttp2_frame_priority_init(&frame.priority, 1, &pri_spec);
 
-  CU_ASSERT(0 == nghttp2_session_on_priority_received(session, &frame));
+  assert_int(0, ==, nghttp2_session_on_priority_received(session, &frame));
 
   nghttp2_frame_priority_free(&frame.priority);
 
@@ -11014,24 +11291,24 @@ void test_nghttp2_session_repeated_priority_change(void) {
     nghttp2_priority_spec_init(&pri_spec, stream_id, 16, 0);
     nghttp2_frame_priority_init(&frame.priority, 1, &pri_spec);
 
-    CU_ASSERT(0 == nghttp2_session_on_priority_received(session, &frame));
+    assert_int(0, ==, nghttp2_session_on_priority_received(session, &frame));
 
     nghttp2_frame_priority_free(&frame.priority);
   }
 
-  CU_ASSERT(20 == session->num_idle_streams);
-  CU_ASSERT(1 == session->idle_stream_head->stream_id);
+  assert_size(20, ==, session->num_idle_streams);
+  assert_int32(1, ==, session->idle_stream_head->stream_id);
 
   /* 1 -> last_stream_id */
   nghttp2_priority_spec_init(&pri_spec, last_stream_id, 16, 0);
   nghttp2_frame_priority_init(&frame.priority, 1, &pri_spec);
 
-  CU_ASSERT(0 == nghttp2_session_on_priority_received(session, &frame));
+  assert_int(0, ==, nghttp2_session_on_priority_received(session, &frame));
 
   nghttp2_frame_priority_free(&frame.priority);
 
-  CU_ASSERT(20 == session->num_idle_streams);
-  CU_ASSERT(3 == session->idle_stream_head->stream_id);
+  assert_size(20, ==, session->num_idle_streams);
+  assert_int32(3, ==, session->idle_stream_head->stream_id);
 
   nghttp2_session_del(session);
 }
@@ -11045,7 +11322,7 @@ void test_nghttp2_session_repeated_priority_submission(void) {
 
   memset(&callbacks, 0, sizeof(callbacks));
 
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   nghttp2_session_client_new(&session, &callbacks, NULL);
 
@@ -11054,8 +11331,8 @@ void test_nghttp2_session_repeated_priority_submission(void) {
   /* 1 -> 0 */
   nghttp2_priority_spec_init(&pri_spec, 0, 16, 0);
 
-  CU_ASSERT(0 ==
-            nghttp2_submit_priority(session, NGHTTP2_FLAG_NONE, 1, &pri_spec));
+  assert_int(0, ==,
+             nghttp2_submit_priority(session, NGHTTP2_FLAG_NONE, 1, &pri_spec));
 
   last_stream_id = (int32_t)(max_streams * 2 + 1);
 
@@ -11063,23 +11340,24 @@ void test_nghttp2_session_repeated_priority_submission(void) {
     /* 1 -> stream_id */
     nghttp2_priority_spec_init(&pri_spec, stream_id, 16, 0);
 
-    CU_ASSERT(
-        0 == nghttp2_submit_priority(session, NGHTTP2_FLAG_NONE, 1, &pri_spec));
+    assert_int(
+        0, ==,
+        nghttp2_submit_priority(session, NGHTTP2_FLAG_NONE, 1, &pri_spec));
   }
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(max_streams == session->num_idle_streams);
-  CU_ASSERT(1 == session->idle_stream_head->stream_id);
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_size(max_streams, ==, session->num_idle_streams);
+  assert_int32(1, ==, session->idle_stream_head->stream_id);
 
   /* 1 -> last_stream_id */
   nghttp2_priority_spec_init(&pri_spec, last_stream_id, 16, 0);
 
-  CU_ASSERT(0 ==
-            nghttp2_submit_priority(session, NGHTTP2_FLAG_NONE, 1, &pri_spec));
+  assert_int(0, ==,
+             nghttp2_submit_priority(session, NGHTTP2_FLAG_NONE, 1, &pri_spec));
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(max_streams == session->num_idle_streams);
-  CU_ASSERT(3 == session->idle_stream_head->stream_id);
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_size(max_streams, ==, session->num_idle_streams);
+  assert_int32(3, ==, session->idle_stream_head->stream_id);
 
   nghttp2_session_del(session);
 }
@@ -11091,117 +11369,129 @@ void test_nghttp2_session_set_local_window_size(void) {
   nghttp2_stream *stream;
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   nghttp2_session_client_new(&session, &callbacks, NULL);
   stream = open_sent_stream(session, 1);
   stream->recv_window_size = 4096;
 
-  CU_ASSERT(0 == nghttp2_session_set_local_window_size(
-                     session, NGHTTP2_FLAG_NONE, 1, 65536));
-  CU_ASSERT(NGHTTP2_INITIAL_CONNECTION_WINDOW_SIZE + 1 ==
-            stream->local_window_size);
-  CU_ASSERT(4096 == stream->recv_window_size);
-  CU_ASSERT(65536 - 4096 ==
-            nghttp2_session_get_stream_local_window_size(session, 1));
+  assert_int(0, ==,
+             nghttp2_session_set_local_window_size(session, NGHTTP2_FLAG_NONE,
+                                                   1, 65536));
+  assert_int32(NGHTTP2_INITIAL_CONNECTION_WINDOW_SIZE + 1, ==,
+               stream->local_window_size);
+  assert_int32(4096, ==, stream->recv_window_size);
+  assert_int32(65536 - 4096, ==,
+               nghttp2_session_get_stream_local_window_size(session, 1));
 
   item = nghttp2_session_get_next_ob_item(session);
 
-  CU_ASSERT(NGHTTP2_WINDOW_UPDATE == item->frame.hd.type);
-  CU_ASSERT(1 == item->frame.window_update.hd.stream_id);
-  CU_ASSERT(1 == item->frame.window_update.window_size_increment);
+  assert_uint8(NGHTTP2_WINDOW_UPDATE, ==, item->frame.hd.type);
+  assert_int32(1, ==, item->frame.window_update.hd.stream_id);
+  assert_int32(1, ==, item->frame.window_update.window_size_increment);
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
 
   /* Go decrement part */
-  CU_ASSERT(0 == nghttp2_session_set_local_window_size(
-                     session, NGHTTP2_FLAG_NONE, 1, 32768));
-  CU_ASSERT(32768 == stream->local_window_size);
-  CU_ASSERT(-28672 == stream->recv_window_size);
-  CU_ASSERT(32768 == stream->recv_reduction);
-  CU_ASSERT(65536 - 4096 ==
-            nghttp2_session_get_stream_local_window_size(session, 1));
+  assert_int(0, ==,
+             nghttp2_session_set_local_window_size(session, NGHTTP2_FLAG_NONE,
+                                                   1, 32768));
+  assert_int32(32768, ==, stream->local_window_size);
+  assert_int32(-28672, ==, stream->recv_window_size);
+  assert_int32(32768, ==, stream->recv_reduction);
+  assert_int32(65536 - 4096, ==,
+               nghttp2_session_get_stream_local_window_size(session, 1));
 
   item = nghttp2_session_get_next_ob_item(session);
 
-  CU_ASSERT(item == NULL);
+  assert_null(item);
 
   /* Increase local window size */
-  CU_ASSERT(0 == nghttp2_session_set_local_window_size(
-                     session, NGHTTP2_FLAG_NONE, 1, 49152));
-  CU_ASSERT(49152 == stream->local_window_size);
-  CU_ASSERT(-12288 == stream->recv_window_size);
-  CU_ASSERT(16384 == stream->recv_reduction);
-  CU_ASSERT(65536 - 4096 ==
-            nghttp2_session_get_stream_local_window_size(session, 1));
-  CU_ASSERT(NULL == nghttp2_session_get_next_ob_item(session));
+  assert_int(0, ==,
+             nghttp2_session_set_local_window_size(session, NGHTTP2_FLAG_NONE,
+                                                   1, 49152));
+  assert_int32(49152, ==, stream->local_window_size);
+  assert_int32(-12288, ==, stream->recv_window_size);
+  assert_int32(16384, ==, stream->recv_reduction);
+  assert_int32(65536 - 4096, ==,
+               nghttp2_session_get_stream_local_window_size(session, 1));
+  assert_null(nghttp2_session_get_next_ob_item(session));
 
   /* Increase local window again */
-  CU_ASSERT(0 == nghttp2_session_set_local_window_size(
-                     session, NGHTTP2_FLAG_NONE, 1, 65537));
-  CU_ASSERT(65537 == stream->local_window_size);
-  CU_ASSERT(4096 == stream->recv_window_size);
-  CU_ASSERT(0 == stream->recv_reduction);
-  CU_ASSERT(65537 - 4096 ==
-            nghttp2_session_get_stream_local_window_size(session, 1));
+  assert_int(0, ==,
+             nghttp2_session_set_local_window_size(session, NGHTTP2_FLAG_NONE,
+                                                   1, 65537));
+  assert_int32(65537, ==, stream->local_window_size);
+  assert_int32(4096, ==, stream->recv_window_size);
+  assert_int32(0, ==, stream->recv_reduction);
+  assert_int32(65537 - 4096, ==,
+               nghttp2_session_get_stream_local_window_size(session, 1));
 
   item = nghttp2_session_get_next_ob_item(session);
 
-  CU_ASSERT(1 == item->frame.window_update.window_size_increment);
+  assert_int32(1, ==, item->frame.window_update.window_size_increment);
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
 
   /* Check connection-level flow control */
   session->recv_window_size = 4096;
-  CU_ASSERT(0 == nghttp2_session_set_local_window_size(
-                     session, NGHTTP2_FLAG_NONE, 0, 65536));
-  CU_ASSERT(NGHTTP2_INITIAL_CONNECTION_WINDOW_SIZE + 1 ==
-            session->local_window_size);
-  CU_ASSERT(4096 == session->recv_window_size);
-  CU_ASSERT(65536 - 4096 == nghttp2_session_get_local_window_size(session));
+  assert_int(0, ==,
+             nghttp2_session_set_local_window_size(session, NGHTTP2_FLAG_NONE,
+                                                   0, 65536));
+  assert_int32(NGHTTP2_INITIAL_CONNECTION_WINDOW_SIZE + 1, ==,
+               session->local_window_size);
+  assert_int32(4096, ==, session->recv_window_size);
+  assert_int32(65536 - 4096, ==,
+               nghttp2_session_get_local_window_size(session));
 
   item = nghttp2_session_get_next_ob_item(session);
 
-  CU_ASSERT(NGHTTP2_WINDOW_UPDATE == item->frame.hd.type);
-  CU_ASSERT(0 == item->frame.window_update.hd.stream_id);
-  CU_ASSERT(1 == item->frame.window_update.window_size_increment);
+  assert_uint8(NGHTTP2_WINDOW_UPDATE, ==, item->frame.hd.type);
+  assert_int32(0, ==, item->frame.window_update.hd.stream_id);
+  assert_int32(1, ==, item->frame.window_update.window_size_increment);
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
 
   /* Go decrement part */
-  CU_ASSERT(0 == nghttp2_session_set_local_window_size(
-                     session, NGHTTP2_FLAG_NONE, 0, 32768));
-  CU_ASSERT(32768 == session->local_window_size);
-  CU_ASSERT(-28672 == session->recv_window_size);
-  CU_ASSERT(32768 == session->recv_reduction);
-  CU_ASSERT(65536 - 4096 == nghttp2_session_get_local_window_size(session));
+  assert_int(0, ==,
+             nghttp2_session_set_local_window_size(session, NGHTTP2_FLAG_NONE,
+                                                   0, 32768));
+  assert_int32(32768, ==, session->local_window_size);
+  assert_int32(-28672, ==, session->recv_window_size);
+  assert_int32(32768, ==, session->recv_reduction);
+  assert_int32(65536 - 4096, ==,
+               nghttp2_session_get_local_window_size(session));
 
   item = nghttp2_session_get_next_ob_item(session);
 
-  CU_ASSERT(item == NULL);
+  assert_null(item);
 
   /* Increase local window size */
-  CU_ASSERT(0 == nghttp2_session_set_local_window_size(
-                     session, NGHTTP2_FLAG_NONE, 0, 49152));
-  CU_ASSERT(49152 == session->local_window_size);
-  CU_ASSERT(-12288 == session->recv_window_size);
-  CU_ASSERT(16384 == session->recv_reduction);
-  CU_ASSERT(65536 - 4096 == nghttp2_session_get_local_window_size(session));
-  CU_ASSERT(NULL == nghttp2_session_get_next_ob_item(session));
+  assert_int(0, ==,
+             nghttp2_session_set_local_window_size(session, NGHTTP2_FLAG_NONE,
+                                                   0, 49152));
+  assert_int32(49152, ==, session->local_window_size);
+  assert_int32(-12288, ==, session->recv_window_size);
+  assert_int32(16384, ==, session->recv_reduction);
+  assert_int32(65536 - 4096, ==,
+               nghttp2_session_get_local_window_size(session));
+  assert_null(nghttp2_session_get_next_ob_item(session));
 
   /* Increase local window again */
-  CU_ASSERT(0 == nghttp2_session_set_local_window_size(
-                     session, NGHTTP2_FLAG_NONE, 0, 65537));
-  CU_ASSERT(65537 == session->local_window_size);
-  CU_ASSERT(4096 == session->recv_window_size);
-  CU_ASSERT(0 == session->recv_reduction);
-  CU_ASSERT(65537 - 4096 == nghttp2_session_get_local_window_size(session));
+  assert_int(0, ==,
+             nghttp2_session_set_local_window_size(session, NGHTTP2_FLAG_NONE,
+                                                   0, 65537));
+  assert_int32(65537, ==, session->local_window_size);
+  assert_int32(4096, ==, session->recv_window_size);
+  assert_int32(0, ==, session->recv_reduction);
+  assert_int32(65537 - 4096, ==,
+               nghttp2_session_get_local_window_size(session));
 
   item = nghttp2_session_get_next_ob_item(session);
 
-  CU_ASSERT(1 == item->frame.window_update.window_size_increment);
+  assert_int32(1, ==, item->frame.window_update.window_size_increment);
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
 
   nghttp2_session_del(session);
 
@@ -11211,25 +11501,26 @@ void test_nghttp2_session_set_local_window_size(void) {
   stream = open_sent_stream(session, 1);
   stream->recv_window_size = NGHTTP2_INITIAL_WINDOW_SIZE;
 
-  CU_ASSERT(0 == nghttp2_session_set_local_window_size(
-                     session, NGHTTP2_FLAG_NONE, 1, 0));
-  CU_ASSERT(0 == stream->recv_window_size);
-  CU_ASSERT(0 == nghttp2_session_get_stream_local_window_size(session, 1));
+  assert_int(
+      0, ==,
+      nghttp2_session_set_local_window_size(session, NGHTTP2_FLAG_NONE, 1, 0));
+  assert_int32(0, ==, stream->recv_window_size);
+  assert_int32(0, ==, nghttp2_session_get_stream_local_window_size(session, 1));
   /* This should submit WINDOW_UPDATE frame because stream-level
      receiving window is now full. */
-  CU_ASSERT(0 ==
-            nghttp2_session_set_local_window_size(session, NGHTTP2_FLAG_NONE, 1,
-                                                  NGHTTP2_INITIAL_WINDOW_SIZE));
-  CU_ASSERT(0 == stream->recv_window_size);
-  CU_ASSERT(NGHTTP2_INITIAL_WINDOW_SIZE ==
-            nghttp2_session_get_stream_local_window_size(session, 1));
+  assert_int(0, ==,
+             nghttp2_session_set_local_window_size(
+                 session, NGHTTP2_FLAG_NONE, 1, NGHTTP2_INITIAL_WINDOW_SIZE));
+  assert_int32(0, ==, stream->recv_window_size);
+  assert_int32(NGHTTP2_INITIAL_WINDOW_SIZE, ==,
+               nghttp2_session_get_stream_local_window_size(session, 1));
 
   item = nghttp2_session_get_next_ob_item(session);
 
-  CU_ASSERT(NGHTTP2_WINDOW_UPDATE == item->frame.hd.type);
-  CU_ASSERT(1 == item->frame.hd.stream_id);
-  CU_ASSERT(NGHTTP2_INITIAL_WINDOW_SIZE ==
-            item->frame.window_update.window_size_increment);
+  assert_uint8(NGHTTP2_WINDOW_UPDATE, ==, item->frame.hd.type);
+  assert_int32(1, ==, item->frame.hd.stream_id);
+  assert_int32(NGHTTP2_INITIAL_WINDOW_SIZE, ==,
+               item->frame.window_update.window_size_increment);
 
   nghttp2_session_del(session);
 
@@ -11239,25 +11530,26 @@ void test_nghttp2_session_set_local_window_size(void) {
   nghttp2_session_client_new(&session, &callbacks, NULL);
   session->recv_window_size = NGHTTP2_INITIAL_WINDOW_SIZE;
 
-  CU_ASSERT(0 == nghttp2_session_set_local_window_size(
-                     session, NGHTTP2_FLAG_NONE, 0, 0));
-  CU_ASSERT(0 == session->recv_window_size);
-  CU_ASSERT(0 == nghttp2_session_get_local_window_size(session));
+  assert_int(
+      0, ==,
+      nghttp2_session_set_local_window_size(session, NGHTTP2_FLAG_NONE, 0, 0));
+  assert_int32(0, ==, session->recv_window_size);
+  assert_int32(0, ==, nghttp2_session_get_local_window_size(session));
   /* This should submit WINDOW_UPDATE frame because connection-level
      receiving window is now full. */
-  CU_ASSERT(0 ==
-            nghttp2_session_set_local_window_size(session, NGHTTP2_FLAG_NONE, 0,
-                                                  NGHTTP2_INITIAL_WINDOW_SIZE));
-  CU_ASSERT(0 == session->recv_window_size);
-  CU_ASSERT(NGHTTP2_INITIAL_WINDOW_SIZE ==
-            nghttp2_session_get_local_window_size(session));
+  assert_int(0, ==,
+             nghttp2_session_set_local_window_size(
+                 session, NGHTTP2_FLAG_NONE, 0, NGHTTP2_INITIAL_WINDOW_SIZE));
+  assert_int32(0, ==, session->recv_window_size);
+  assert_int32(NGHTTP2_INITIAL_WINDOW_SIZE, ==,
+               nghttp2_session_get_local_window_size(session));
 
   item = nghttp2_session_get_next_ob_item(session);
 
-  CU_ASSERT(NGHTTP2_WINDOW_UPDATE == item->frame.hd.type);
-  CU_ASSERT(0 == item->frame.hd.stream_id);
-  CU_ASSERT(NGHTTP2_INITIAL_WINDOW_SIZE ==
-            item->frame.window_update.window_size_increment);
+  assert_uint8(NGHTTP2_WINDOW_UPDATE, ==, item->frame.hd.type);
+  assert_int32(0, ==, item->frame.hd.stream_id);
+  assert_int32(NGHTTP2_INITIAL_WINDOW_SIZE, ==,
+               item->frame.window_update.window_size_increment);
 
   nghttp2_session_del(session);
 }
@@ -11268,7 +11560,7 @@ void test_nghttp2_session_cancel_from_before_frame_send(void) {
   nghttp2_session_callbacks callbacks;
   my_user_data ud;
   nghttp2_settings_entry iv;
-  nghttp2_data_provider data_prd;
+  nghttp2_data_provider2 data_prd;
   int32_t stream_id;
   nghttp2_stream *stream;
 
@@ -11276,7 +11568,7 @@ void test_nghttp2_session_cancel_from_before_frame_send(void) {
 
   callbacks.before_frame_send_callback = cancel_before_frame_send_callback;
   callbacks.on_frame_not_send_callback = on_frame_not_send_callback;
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   nghttp2_session_client_new(&session, &callbacks, &ud);
 
@@ -11285,7 +11577,7 @@ void test_nghttp2_session_cancel_from_before_frame_send(void) {
 
   rv = nghttp2_submit_settings(session, NGHTTP2_FLAG_NONE, &iv, 1);
 
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   ud.frame_send_cb_called = 0;
   ud.before_frame_send_cb_called = 0;
@@ -11293,18 +11585,18 @@ void test_nghttp2_session_cancel_from_before_frame_send(void) {
 
   rv = nghttp2_session_send(session);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(0 == ud.frame_send_cb_called);
-  CU_ASSERT(1 == ud.before_frame_send_cb_called);
-  CU_ASSERT(1 == ud.frame_not_send_cb_called);
+  assert_int(0, ==, rv);
+  assert_int(0, ==, ud.frame_send_cb_called);
+  assert_int(1, ==, ud.before_frame_send_cb_called);
+  assert_int(1, ==, ud.frame_not_send_cb_called);
 
   data_prd.source.ptr = NULL;
   data_prd.read_callback = temporal_failure_data_source_read_callback;
 
-  stream_id = nghttp2_submit_request(session, NULL, reqnv, ARRLEN(reqnv),
-                                     &data_prd, NULL);
+  stream_id = nghttp2_submit_request2(session, NULL, reqnv, ARRLEN(reqnv),
+                                      &data_prd, NULL);
 
-  CU_ASSERT(stream_id > 0);
+  assert_int32(0, <, stream_id);
 
   ud.frame_send_cb_called = 0;
   ud.before_frame_send_cb_called = 0;
@@ -11312,14 +11604,14 @@ void test_nghttp2_session_cancel_from_before_frame_send(void) {
 
   rv = nghttp2_session_send(session);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(0 == ud.frame_send_cb_called);
-  CU_ASSERT(1 == ud.before_frame_send_cb_called);
-  CU_ASSERT(1 == ud.frame_not_send_cb_called);
+  assert_int(0, ==, rv);
+  assert_int(0, ==, ud.frame_send_cb_called);
+  assert_int(1, ==, ud.before_frame_send_cb_called);
+  assert_int(1, ==, ud.frame_not_send_cb_called);
 
   stream = nghttp2_session_get_stream_raw(session, stream_id);
 
-  CU_ASSERT(NULL == stream);
+  assert_null(stream);
 
   nghttp2_session_del(session);
 
@@ -11330,7 +11622,7 @@ void test_nghttp2_session_cancel_from_before_frame_send(void) {
   stream_id = nghttp2_submit_push_promise(session, NGHTTP2_FLAG_NONE, 1, reqnv,
                                           ARRLEN(reqnv), NULL);
 
-  CU_ASSERT(stream_id > 0);
+  assert_int32(0, <, stream_id);
 
   ud.frame_send_cb_called = 0;
   ud.before_frame_send_cb_called = 0;
@@ -11338,14 +11630,14 @@ void test_nghttp2_session_cancel_from_before_frame_send(void) {
 
   rv = nghttp2_session_send(session);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(0 == ud.frame_send_cb_called);
-  CU_ASSERT(1 == ud.before_frame_send_cb_called);
-  CU_ASSERT(1 == ud.frame_not_send_cb_called);
+  assert_int(0, ==, rv);
+  assert_int(0, ==, ud.frame_send_cb_called);
+  assert_int(1, ==, ud.before_frame_send_cb_called);
+  assert_int(1, ==, ud.frame_not_send_cb_called);
 
   stream = nghttp2_session_get_stream_raw(session, stream_id);
 
-  CU_ASSERT(NULL == stream);
+  assert_null(stream);
 
   nghttp2_session_del(session);
 }
@@ -11357,7 +11649,7 @@ void test_nghttp2_session_too_many_settings(void) {
   nghttp2_frame frame;
   nghttp2_bufs bufs;
   nghttp2_buf *buf;
-  ssize_t rv;
+  nghttp2_ssize rv;
   my_user_data ud;
   nghttp2_settings_entry iv[3];
   nghttp2_mem *mem;
@@ -11368,14 +11660,14 @@ void test_nghttp2_session_too_many_settings(void) {
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
   callbacks.on_frame_recv_callback = on_frame_recv_callback;
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   nghttp2_option_new(&option);
   nghttp2_option_set_max_settings(option, 1);
 
   nghttp2_session_client_new2(&session, &callbacks, &ud, option);
 
-  CU_ASSERT(1 == session->max_settings);
+  assert_size(1, ==, session->max_settings);
 
   nghttp2_option_del(option);
 
@@ -11390,8 +11682,8 @@ void test_nghttp2_session_too_many_settings(void) {
 
   rv = nghttp2_frame_pack_settings(&bufs, &frame.settings);
 
-  CU_ASSERT(0 == rv);
-  CU_ASSERT(nghttp2_bufs_len(&bufs) > 0);
+  assert_ptrdiff(0, ==, rv);
+  assert_size(0, <, nghttp2_bufs_len(&bufs));
 
   nghttp2_frame_settings_free(&frame.settings, mem);
 
@@ -11400,11 +11692,11 @@ void test_nghttp2_session_too_many_settings(void) {
 
   ud.frame_recv_cb_called = 0;
 
-  rv = nghttp2_session_mem_recv(session, buf->pos, nghttp2_buf_len(buf));
-  CU_ASSERT((ssize_t)nghttp2_buf_len(buf) == rv);
+  rv = nghttp2_session_mem_recv2(session, buf->pos, nghttp2_buf_len(buf));
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(buf), ==, rv);
 
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(NGHTTP2_GOAWAY == item->frame.hd.type);
+  assert_uint8(NGHTTP2_GOAWAY, ==, item->frame.hd.type);
 
   nghttp2_bufs_reset(&bufs);
   nghttp2_bufs_free(&bufs);
@@ -11418,7 +11710,7 @@ prepare_session_removed_closed_stream(nghttp2_session *session,
   nghttp2_settings_entry iv;
   nghttp2_bufs bufs;
   nghttp2_mem *mem;
-  ssize_t nread;
+  nghttp2_ssize nread;
   int i;
   nghttp2_stream *stream;
   nghttp2_frame_hd hd;
@@ -11432,23 +11724,23 @@ prepare_session_removed_closed_stream(nghttp2_session *session,
 
   rv = nghttp2_submit_settings(session, NGHTTP2_FLAG_NONE, &iv, 1);
 
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   rv = nghttp2_session_send(session);
 
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   for (i = 1; i <= 3; i += 2) {
     rv = pack_headers(&bufs, deflater, i,
                       NGHTTP2_FLAG_END_HEADERS | NGHTTP2_FLAG_END_STREAM, reqnv,
                       ARRLEN(reqnv), mem);
 
-    CU_ASSERT(0 == rv);
+    assert_int(0, ==, rv);
 
-    nread = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                     nghttp2_bufs_len(&bufs));
+    nread = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                      nghttp2_bufs_len(&bufs));
 
-    CU_ASSERT((ssize_t)nghttp2_bufs_len(&bufs) == nread);
+    assert_ptrdiff((nghttp2_ssize)nghttp2_bufs_len(&bufs), ==, nread);
 
     nghttp2_bufs_reset(&bufs);
   }
@@ -11459,17 +11751,17 @@ prepare_session_removed_closed_stream(nghttp2_session *session,
                     NGHTTP2_FLAG_END_HEADERS | NGHTTP2_FLAG_END_STREAM, reqnv,
                     ARRLEN(reqnv), mem);
 
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
   /* Receiving stream 5 will erase stream 3 from closed stream list */
-  nread = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                   nghttp2_bufs_len(&bufs));
+  nread = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                    nghttp2_bufs_len(&bufs));
 
-  CU_ASSERT((ssize_t)nghttp2_bufs_len(&bufs) == nread);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_bufs_len(&bufs), ==, nread);
 
   stream = nghttp2_session_get_stream_raw(session, 3);
 
-  CU_ASSERT(NULL == stream);
+  assert_null(stream);
 
   /* Since the current max concurrent streams is
      NGHTTP2_DEFAULT_MAX_CONCURRENT_STREAMS, receiving frame on stream
@@ -11479,24 +11771,24 @@ prepare_session_removed_closed_stream(nghttp2_session *session,
                     NGHTTP2_FLAG_END_HEADERS | NGHTTP2_FLAG_END_STREAM,
                     trailernv, ARRLEN(trailernv), mem);
 
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
-  nread = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                   nghttp2_bufs_len(&bufs));
+  nread = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                    nghttp2_bufs_len(&bufs));
 
-  CU_ASSERT((ssize_t)nghttp2_bufs_len(&bufs) == nread);
-  CU_ASSERT(NULL == nghttp2_session_get_next_ob_item(session));
+  assert_ptrdiff((nghttp2_ssize)nghttp2_bufs_len(&bufs), ==, nread);
+  assert_null(nghttp2_session_get_next_ob_item(session));
 
   nghttp2_frame_hd_init(&hd, 0, NGHTTP2_DATA, NGHTTP2_FLAG_NONE, 3);
   nghttp2_bufs_reset(&bufs);
   nghttp2_frame_pack_frame_hd(bufs.head->buf.last, &hd);
   bufs.head->buf.last += NGHTTP2_FRAME_HDLEN;
 
-  nread = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                   nghttp2_bufs_len(&bufs));
+  nread = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                    nghttp2_bufs_len(&bufs));
 
-  CU_ASSERT((ssize_t)nghttp2_bufs_len(&bufs) == nread);
-  CU_ASSERT(NULL == nghttp2_session_get_next_ob_item(session));
+  assert_ptrdiff((nghttp2_ssize)nghttp2_bufs_len(&bufs), ==, nread);
+  assert_null(nghttp2_session_get_next_ob_item(session));
 
   /* Now server receives SETTINGS ACK */
   nghttp2_frame_hd_init(&hd, 0, NGHTTP2_SETTINGS, NGHTTP2_FLAG_ACK, 0);
@@ -11504,10 +11796,10 @@ prepare_session_removed_closed_stream(nghttp2_session *session,
   nghttp2_frame_pack_frame_hd(bufs.head->buf.last, &hd);
   bufs.head->buf.last += NGHTTP2_FRAME_HDLEN;
 
-  nread = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                   nghttp2_bufs_len(&bufs));
+  nread = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                    nghttp2_bufs_len(&bufs));
 
-  CU_ASSERT((ssize_t)nghttp2_bufs_len(&bufs) == nread);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_bufs_len(&bufs), ==, nread);
 
   nghttp2_bufs_free(&bufs);
 }
@@ -11519,7 +11811,7 @@ void test_nghttp2_session_removed_closed_stream(void) {
   nghttp2_hd_deflater deflater;
   nghttp2_bufs bufs;
   nghttp2_mem *mem;
-  ssize_t nread;
+  nghttp2_ssize nread;
   nghttp2_frame_hd hd;
   nghttp2_outbound_item *item;
 
@@ -11529,7 +11821,7 @@ void test_nghttp2_session_removed_closed_stream(void) {
 
   memset(&callbacks, 0, sizeof(callbacks));
 
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   nghttp2_session_server_new(&session, &callbacks, NULL);
 
@@ -11548,16 +11840,16 @@ void test_nghttp2_session_removed_closed_stream(void) {
                     NGHTTP2_FLAG_END_HEADERS | NGHTTP2_FLAG_END_STREAM,
                     trailernv, ARRLEN(trailernv), mem);
 
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
-  nread = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                   nghttp2_bufs_len(&bufs));
+  nread = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                    nghttp2_bufs_len(&bufs));
 
-  CU_ASSERT((ssize_t)nghttp2_bufs_len(&bufs) == nread);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_bufs_len(&bufs), ==, nread);
 
   item = nghttp2_session_get_next_ob_item(session);
 
-  CU_ASSERT(NULL == item);
+  assert_null(item);
 
   nghttp2_hd_deflate_free(&deflater);
   nghttp2_session_del(session);
@@ -11573,14 +11865,14 @@ void test_nghttp2_session_removed_closed_stream(void) {
   nghttp2_frame_pack_frame_hd(bufs.head->buf.last, &hd);
   bufs.head->buf.last += NGHTTP2_FRAME_HDLEN;
 
-  nread = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                   nghttp2_bufs_len(&bufs));
+  nread = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                    nghttp2_bufs_len(&bufs));
 
-  CU_ASSERT((ssize_t)nghttp2_bufs_len(&bufs) == nread);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_bufs_len(&bufs), ==, nread);
 
   item = nghttp2_session_get_next_ob_item(session);
 
-  CU_ASSERT(NULL == item);
+  assert_null(item);
 
   nghttp2_hd_deflate_free(&deflater);
   nghttp2_session_del(session);
@@ -11588,7 +11880,7 @@ void test_nghttp2_session_removed_closed_stream(void) {
   nghttp2_bufs_free(&bufs);
 }
 
-static ssize_t pause_once_data_source_read_callback(
+static nghttp2_ssize pause_once_data_source_read_callback(
     nghttp2_session *session, int32_t stream_id, uint8_t *buf, size_t len,
     uint32_t *data_flags, nghttp2_data_source *source, void *user_data) {
   my_user_data *ud = user_data;
@@ -11604,11 +11896,11 @@ static ssize_t pause_once_data_source_read_callback(
 void test_nghttp2_session_pause_data(void) {
   nghttp2_session *session;
   nghttp2_session_callbacks callbacks;
-  nghttp2_data_provider data_prd;
+  nghttp2_data_provider2 data_prd;
   my_user_data ud;
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
   callbacks.on_frame_send_callback = on_frame_send_callback;
 
   data_prd.read_callback = pause_once_data_source_read_callback;
@@ -11618,19 +11910,20 @@ void test_nghttp2_session_pause_data(void) {
 
   open_recv_stream(session, 1);
 
-  CU_ASSERT(
-      0 == nghttp2_submit_data(session, NGHTTP2_FLAG_END_STREAM, 1, &data_prd));
+  assert_int(
+      0, ==,
+      nghttp2_submit_data2(session, NGHTTP2_FLAG_END_STREAM, 1, &data_prd));
 
   ud.frame_send_cb_called = 0;
   ud.data_source_read_cb_paused = 0;
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(0 == ud.frame_send_cb_called);
-  CU_ASSERT(NULL == session->aob.item);
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(1 == ud.frame_send_cb_called);
-  CU_ASSERT(NGHTTP2_DATA == ud.sent_frame_type);
-  CU_ASSERT(NULL == nghttp2_session_get_next_ob_item(session));
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_int(0, ==, ud.frame_send_cb_called);
+  assert_null(session->aob.item);
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_int(1, ==, ud.frame_send_cb_called);
+  assert_uint8(NGHTTP2_DATA, ==, ud.sent_frame_type);
+  assert_null(nghttp2_session_get_next_ob_item(session));
 
   nghttp2_session_del(session);
 }
@@ -11651,7 +11944,7 @@ void test_nghttp2_session_no_closed_streams(void) {
 
   nghttp2_session_close_stream(session, 1, NGHTTP2_NO_ERROR);
 
-  CU_ASSERT(0 == session->num_closed_streams);
+  assert_size(0, ==, session->num_closed_streams);
 
   nghttp2_session_del(session);
   nghttp2_option_del(option);
@@ -11664,28 +11957,28 @@ void test_nghttp2_session_set_stream_user_data(void) {
   int user_data1, user_data2;
   int rv;
   const uint8_t *datap;
-  ssize_t datalen;
+  nghttp2_ssize datalen;
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
 
   nghttp2_session_client_new(&session, &callbacks, NULL);
 
-  stream_id = nghttp2_submit_request(session, NULL, reqnv, ARRLEN(reqnv), NULL,
-                                     &user_data1);
+  stream_id = nghttp2_submit_request2(session, NULL, reqnv, ARRLEN(reqnv), NULL,
+                                      &user_data1);
 
   rv = nghttp2_session_set_stream_user_data(session, stream_id, &user_data2);
 
-  CU_ASSERT(0 == rv);
+  assert_int(0, ==, rv);
 
-  datalen = nghttp2_session_mem_send(session, &datap);
+  datalen = nghttp2_session_mem_send2(session, &datap);
 
-  CU_ASSERT(datalen > 0);
+  assert_ptrdiff(0, <, datalen);
 
-  CU_ASSERT(&user_data2 ==
-            nghttp2_session_get_stream_user_data(session, stream_id));
+  assert_ptr_equal(&user_data2,
+                   nghttp2_session_get_stream_user_data(session, stream_id));
 
-  CU_ASSERT(NGHTTP2_ERR_INVALID_ARGUMENT ==
-            nghttp2_session_set_stream_user_data(session, 2, NULL));
+  assert_int(NGHTTP2_ERR_INVALID_ARGUMENT, ==,
+             nghttp2_session_set_stream_user_data(session, 2, NULL));
 
   nghttp2_session_del(session);
 }
@@ -11693,7 +11986,7 @@ void test_nghttp2_session_set_stream_user_data(void) {
 void test_nghttp2_session_no_rfc7540_priorities(void) {
   nghttp2_session *session;
   nghttp2_session_callbacks callbacks;
-  nghttp2_data_provider data_prd;
+  nghttp2_data_provider2 data_prd;
   my_user_data ud;
   nghttp2_outbound_item *item;
   nghttp2_mem *mem;
@@ -11703,70 +11996,76 @@ void test_nghttp2_session_no_rfc7540_priorities(void) {
   mem = nghttp2_mem_default();
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   /* Do not use a dependency tree if SETTINGS_NO_RFC7540_PRIORITIES =
      1. */
   data_prd.read_callback = fixed_length_data_source_read_callback;
 
   ud.data_source_length = 128 * 1024;
-  CU_ASSERT(0 == nghttp2_session_server_new(&session, &callbacks, &ud));
+  assert_int(0, ==, nghttp2_session_server_new(&session, &callbacks, &ud));
 
   iv.settings_id = NGHTTP2_SETTINGS_NO_RFC7540_PRIORITIES;
   iv.value = 1;
 
-  CU_ASSERT(0 == nghttp2_submit_settings(session, NGHTTP2_FLAG_NONE, &iv, 1));
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==,
+             nghttp2_submit_settings(session, NGHTTP2_FLAG_NONE, &iv, 1));
+  assert_int(0, ==, nghttp2_session_send(session));
 
   open_recv_stream2(session, 1, NGHTTP2_STREAM_OPENING);
-  CU_ASSERT(0 == nghttp2_submit_response(session, 1, resnv, ARRLEN(resnv),
-                                         &data_prd));
+  assert_int(
+      0, ==,
+      nghttp2_submit_response2(session, 1, resnv, ARRLEN(resnv), &data_prd));
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(ARRLEN(resnv) == item->frame.headers.nvlen);
+  assert_size(ARRLEN(resnv), ==, item->frame.headers.nvlen);
   assert_nv_equal(resnv, item->frame.headers.nva, item->frame.headers.nvlen,
                   mem);
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
-  CU_ASSERT(1 == nghttp2_pq_size(
-                     &session->sched[NGHTTP2_EXTPRI_DEFAULT_URGENCY].ob_data));
-  CU_ASSERT(nghttp2_pq_empty(&session->root.obq));
+  assert_int(0, ==, nghttp2_session_send(session));
+  assert_size(
+      1, ==,
+      nghttp2_pq_size(&session->sched[NGHTTP2_EXTPRI_DEFAULT_URGENCY].ob_data));
+  assert_true(nghttp2_pq_empty(&session->root.obq));
 
   nghttp2_session_del(session);
 
   /* Priorities are sent as is before client receives
      SETTINGS_NO_RFC7540_PRIORITIES = 1 from server. */
-  CU_ASSERT(0 == nghttp2_session_client_new(&session, &callbacks, NULL));
+  assert_int(0, ==, nghttp2_session_client_new(&session, &callbacks, NULL));
 
   iv.settings_id = NGHTTP2_SETTINGS_NO_RFC7540_PRIORITIES;
   iv.value = 1;
 
-  CU_ASSERT(0 == nghttp2_submit_settings(session, NGHTTP2_FLAG_NONE, &iv, 1));
+  assert_int(0, ==,
+             nghttp2_submit_settings(session, NGHTTP2_FLAG_NONE, &iv, 1));
 
   pri_spec.stream_id = 5;
   pri_spec.weight = 111;
   pri_spec.exclusive = 1;
 
-  CU_ASSERT(1 == nghttp2_submit_request(session, &pri_spec, reqnv,
-                                        ARRLEN(reqnv), NULL, NULL));
+  assert_int32(1, ==,
+               nghttp2_submit_request2(session, &pri_spec, reqnv, ARRLEN(reqnv),
+                                       NULL, NULL));
 
   item = nghttp2_outbound_queue_top(&session->ob_syn);
 
-  CU_ASSERT(NULL != item);
-  CU_ASSERT(NGHTTP2_HEADERS == item->frame.hd.type);
-  CU_ASSERT(pri_spec.stream_id == item->frame.headers.pri_spec.stream_id);
-  CU_ASSERT(pri_spec.weight == item->frame.headers.pri_spec.weight);
-  CU_ASSERT(pri_spec.exclusive == item->frame.headers.pri_spec.exclusive);
+  assert_not_null(item);
+  assert_uint8(NGHTTP2_HEADERS, ==, item->frame.hd.type);
+  assert_int32(pri_spec.stream_id, ==, item->frame.headers.pri_spec.stream_id);
+  assert_int32(pri_spec.weight, ==, item->frame.headers.pri_spec.weight);
+  assert_uint8(pri_spec.exclusive, ==, item->frame.headers.pri_spec.exclusive);
 
   nghttp2_session_del(session);
 
   /* Priorities are defaulted if client received
      SETTINGS_NO_RFC7540_PRIORITIES = 1 from server. */
-  CU_ASSERT(0 == nghttp2_session_client_new(&session, &callbacks, NULL));
+  assert_int(0, ==, nghttp2_session_client_new(&session, &callbacks, NULL));
 
   iv.settings_id = NGHTTP2_SETTINGS_NO_RFC7540_PRIORITIES;
   iv.value = 1;
 
-  CU_ASSERT(0 == nghttp2_submit_settings(session, NGHTTP2_FLAG_NONE, &iv, 1));
+  assert_int(0, ==,
+             nghttp2_submit_settings(session, NGHTTP2_FLAG_NONE, &iv, 1));
 
   session->remote_settings.no_rfc7540_priorities = 1;
 
@@ -11774,14 +12073,16 @@ void test_nghttp2_session_no_rfc7540_priorities(void) {
   pri_spec.weight = 111;
   pri_spec.exclusive = 1;
 
-  CU_ASSERT(1 == nghttp2_submit_request(session, &pri_spec, reqnv,
-                                        ARRLEN(reqnv), NULL, NULL));
+  assert_int32(1, ==,
+               nghttp2_submit_request2(session, &pri_spec, reqnv, ARRLEN(reqnv),
+                                       NULL, NULL));
 
   item = nghttp2_outbound_queue_top(&session->ob_syn);
 
-  CU_ASSERT(NULL != item);
-  CU_ASSERT(NGHTTP2_HEADERS == item->frame.hd.type);
-  CU_ASSERT(nghttp2_priority_spec_check_default(&item->frame.headers.pri_spec));
+  assert_not_null(item);
+  assert_uint8(NGHTTP2_HEADERS, ==, item->frame.hd.type);
+  assert_true(
+      nghttp2_priority_spec_check_default(&item->frame.headers.pri_spec));
 
   nghttp2_session_del(session);
 }
@@ -11793,7 +12094,7 @@ void test_nghttp2_session_server_fallback_rfc7540_priorities(void) {
   nghttp2_frame frame;
   nghttp2_bufs bufs;
   nghttp2_buf *buf;
-  ssize_t rv;
+  nghttp2_ssize rv;
   nghttp2_settings_entry iv;
   nghttp2_mem *mem;
   nghttp2_hd_deflater deflater;
@@ -11809,7 +12110,7 @@ void test_nghttp2_session_server_fallback_rfc7540_priorities(void) {
   frame_pack_bufs_init(&bufs);
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
   callbacks.on_frame_recv_callback = on_frame_recv_callback;
 
   nghttp2_option_new(&option);
@@ -11823,24 +12124,24 @@ void test_nghttp2_session_server_fallback_rfc7540_priorities(void) {
 
   rv = nghttp2_submit_settings(session, NGHTTP2_FLAG_NONE, &iv, 1);
 
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   rv = nghttp2_session_send(session);
 
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   nghttp2_frame_settings_init(&frame.settings, NGHTTP2_FLAG_NONE, NULL, 0);
   rv = nghttp2_frame_pack_settings(&bufs, &frame.settings);
 
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   nghttp2_frame_settings_free(&frame.settings, mem);
 
   buf = &bufs.head->buf;
-  rv = nghttp2_session_mem_recv(session, buf->pos, nghttp2_buf_len(buf));
+  rv = nghttp2_session_mem_recv2(session, buf->pos, nghttp2_buf_len(buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(buf) == rv);
-  CU_ASSERT(1 == session->fallback_rfc7540_priorities);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(buf), ==, rv);
+  assert_true(session->fallback_rfc7540_priorities);
 
   nghttp2_hd_deflate_init(&deflater, mem);
 
@@ -11853,27 +12154,28 @@ void test_nghttp2_session_server_fallback_rfc7540_priorities(void) {
   nghttp2_bufs_reset(&bufs);
   rv = nghttp2_frame_pack_headers(&bufs, &frame.headers, &deflater);
 
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   nghttp2_frame_headers_free(&frame.headers, mem);
 
   buf = &bufs.head->buf;
-  rv = nghttp2_session_mem_recv(session, buf->pos, nghttp2_buf_len(buf));
+  rv = nghttp2_session_mem_recv2(session, buf->pos, nghttp2_buf_len(buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(buf) == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(buf), ==, rv);
 
   anchor_stream = nghttp2_session_get_stream_raw(session, 3);
 
-  CU_ASSERT(NGHTTP2_STREAM_IDLE == anchor_stream->state);
-  CU_ASSERT(
-      !(anchor_stream->flags & NGHTTP2_STREAM_FLAG_NO_RFC7540_PRIORITIES));
-  CU_ASSERT(&session->root == anchor_stream->dep_prev);
+  assert_enum(nghttp2_stream_state, NGHTTP2_STREAM_IDLE, ==,
+              anchor_stream->state);
+  assert_false(anchor_stream->flags &
+               NGHTTP2_STREAM_FLAG_NO_RFC7540_PRIORITIES);
+  assert_ptr_equal(&session->root, anchor_stream->dep_prev);
 
   stream = nghttp2_session_get_stream(session, 1);
 
-  CU_ASSERT(NGHTTP2_STREAM_OPENING == stream->state);
-  CU_ASSERT(!(stream->flags & NGHTTP2_STREAM_FLAG_NO_RFC7540_PRIORITIES));
-  CU_ASSERT(anchor_stream == stream->dep_prev);
+  assert_enum(nghttp2_stream_state, NGHTTP2_STREAM_OPENING, ==, stream->state);
+  assert_false(stream->flags & NGHTTP2_STREAM_FLAG_NO_RFC7540_PRIORITIES);
+  assert_ptr_equal(anchor_stream, stream->dep_prev);
 
   /* Make sure that PRIORITY frame updates stream priority. */
   nghttp2_priority_spec_init(&pri_spec, 5, 1, 0);
@@ -11884,15 +12186,16 @@ void test_nghttp2_session_server_fallback_rfc7540_priorities(void) {
   nghttp2_frame_priority_free(&frame.priority);
 
   buf = &bufs.head->buf;
-  rv = nghttp2_session_mem_recv(session, buf->pos, nghttp2_buf_len(buf));
+  rv = nghttp2_session_mem_recv2(session, buf->pos, nghttp2_buf_len(buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(buf) == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(buf), ==, rv);
 
   anchor_stream = nghttp2_session_get_stream_raw(session, 5);
 
-  CU_ASSERT(NGHTTP2_STREAM_IDLE == anchor_stream->state);
-  CU_ASSERT(&session->root == anchor_stream->dep_prev);
-  CU_ASSERT(anchor_stream == stream->dep_prev);
+  assert_enum(nghttp2_stream_state, NGHTTP2_STREAM_IDLE, ==,
+              anchor_stream->state);
+  assert_ptr_equal(&session->root, anchor_stream->dep_prev);
+  assert_ptr_equal(anchor_stream, stream->dep_prev);
 
   /* Make sure that PRIORITY_UPDATE frame is ignored. */
   frame.ext.payload = &priority_update;
@@ -11903,11 +12206,11 @@ void test_nghttp2_session_server_fallback_rfc7540_priorities(void) {
 
   ud.frame_recv_cb_called = 0;
   buf = &bufs.head->buf;
-  rv = nghttp2_session_mem_recv(session, buf->pos, nghttp2_buf_len(buf));
+  rv = nghttp2_session_mem_recv2(session, buf->pos, nghttp2_buf_len(buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(buf) == rv);
-  CU_ASSERT(0 == ud.frame_recv_cb_called);
-  CU_ASSERT(NGHTTP2_EXTPRI_DEFAULT_URGENCY == stream->extpri);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(buf), ==, rv);
+  assert_int(0, ==, ud.frame_recv_cb_called);
+  assert_uint32(NGHTTP2_EXTPRI_DEFAULT_URGENCY, ==, stream->extpri);
 
   nghttp2_hd_deflate_free(&deflater);
   nghttp2_session_del(session);
@@ -11917,11 +12220,11 @@ void test_nghttp2_session_server_fallback_rfc7540_priorities(void) {
 
   rv = nghttp2_submit_settings(session, NGHTTP2_FLAG_NONE, &iv, 1);
 
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   rv = nghttp2_session_send(session);
 
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   iv.settings_id = NGHTTP2_SETTINGS_NO_RFC7540_PRIORITIES;
   iv.value = 0;
@@ -11931,15 +12234,15 @@ void test_nghttp2_session_server_fallback_rfc7540_priorities(void) {
   nghttp2_bufs_reset(&bufs);
   rv = nghttp2_frame_pack_settings(&bufs, &frame.settings);
 
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   nghttp2_frame_settings_free(&frame.settings, mem);
 
   buf = &bufs.head->buf;
-  rv = nghttp2_session_mem_recv(session, buf->pos, nghttp2_buf_len(buf));
+  rv = nghttp2_session_mem_recv2(session, buf->pos, nghttp2_buf_len(buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(buf) == rv);
-  CU_ASSERT(0 == session->fallback_rfc7540_priorities);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(buf), ==, rv);
+  assert_false(session->fallback_rfc7540_priorities);
 
   nghttp2_hd_deflate_init(&deflater, mem);
 
@@ -11952,20 +12255,20 @@ void test_nghttp2_session_server_fallback_rfc7540_priorities(void) {
   nghttp2_bufs_reset(&bufs);
   rv = nghttp2_frame_pack_headers(&bufs, &frame.headers, &deflater);
 
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   nghttp2_frame_headers_free(&frame.headers, mem);
 
   buf = &bufs.head->buf;
-  rv = nghttp2_session_mem_recv(session, buf->pos, nghttp2_buf_len(buf));
+  rv = nghttp2_session_mem_recv2(session, buf->pos, nghttp2_buf_len(buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(buf) == rv);
-  CU_ASSERT(NULL == nghttp2_session_get_stream_raw(session, 3));
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(buf), ==, rv);
+  assert_null(nghttp2_session_get_stream_raw(session, 3));
 
   stream = nghttp2_session_get_stream(session, 1);
 
-  CU_ASSERT(NGHTTP2_STREAM_OPENING == stream->state);
-  CU_ASSERT(stream->flags & NGHTTP2_STREAM_FLAG_NO_RFC7540_PRIORITIES);
+  assert_enum(nghttp2_stream_state, NGHTTP2_STREAM_OPENING, ==, stream->state);
+  assert_true(stream->flags & NGHTTP2_STREAM_FLAG_NO_RFC7540_PRIORITIES);
 
   nghttp2_hd_deflate_free(&deflater);
   nghttp2_session_del(session);
@@ -11978,7 +12281,7 @@ void test_nghttp2_session_stream_reset_ratelim(void) {
   nghttp2_session *session;
   nghttp2_session_callbacks callbacks;
   nghttp2_frame frame;
-  ssize_t rv;
+  nghttp2_ssize rv;
   nghttp2_bufs bufs;
   nghttp2_buf *buf;
   nghttp2_mem *mem;
@@ -11994,7 +12297,7 @@ void test_nghttp2_session_stream_reset_ratelim(void) {
   frame_pack_bufs_init(&bufs);
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   nghttp2_option_new(&option);
   nghttp2_option_set_stream_reset_rate_limit(
@@ -12005,19 +12308,19 @@ void test_nghttp2_session_stream_reset_ratelim(void) {
   nghttp2_frame_settings_init(&frame.settings, NGHTTP2_FLAG_NONE, NULL, 0);
   rv = nghttp2_frame_pack_settings(&bufs, &frame.settings);
 
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   nghttp2_frame_settings_free(&frame.settings, mem);
 
   buf = &bufs.head->buf;
-  rv = nghttp2_session_mem_recv(session, buf->pos, nghttp2_buf_len(buf));
+  rv = nghttp2_session_mem_recv2(session, buf->pos, nghttp2_buf_len(buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(buf) == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(buf), ==, rv);
 
   /* Send SETTINGS ACK */
   rv = nghttp2_session_send(session);
 
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   nghttp2_hd_deflate_init(&deflater, mem);
 
@@ -12034,14 +12337,14 @@ void test_nghttp2_session_stream_reset_ratelim(void) {
                                nvlen);
     rv = nghttp2_frame_pack_headers(&bufs, &frame.headers, &deflater);
 
-    CU_ASSERT(0 == rv);
+    assert_ptrdiff(0, ==, rv);
 
     nghttp2_frame_headers_free(&frame.headers, mem);
 
     buf = &bufs.head->buf;
-    rv = nghttp2_session_mem_recv(session, buf->pos, nghttp2_buf_len(buf));
+    rv = nghttp2_session_mem_recv2(session, buf->pos, nghttp2_buf_len(buf));
 
-    CU_ASSERT((ssize_t)nghttp2_buf_len(buf) == rv);
+    assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(buf), ==, rv);
 
     nghttp2_bufs_reset(&bufs);
 
@@ -12052,23 +12355,23 @@ void test_nghttp2_session_stream_reset_ratelim(void) {
     nghttp2_frame_rst_stream_free(&frame.rst_stream);
 
     buf = &bufs.head->buf;
-    rv = nghttp2_session_mem_recv(session, buf->pos, nghttp2_buf_len(buf));
+    rv = nghttp2_session_mem_recv2(session, buf->pos, nghttp2_buf_len(buf));
 
-    CU_ASSERT((ssize_t)nghttp2_buf_len(buf) == rv);
+    assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(buf), ==, rv);
 
     if (i < NGHTTP2_DEFAULT_STREAM_RESET_BURST) {
-      CU_ASSERT(0 == nghttp2_outbound_queue_size(&session->ob_reg));
+      assert_size(0, ==, nghttp2_outbound_queue_size(&session->ob_reg));
 
       continue;
     }
 
-    CU_ASSERT(1 == nghttp2_outbound_queue_size(&session->ob_reg));
+    assert_size(1, ==, nghttp2_outbound_queue_size(&session->ob_reg));
 
     item = nghttp2_session_get_next_ob_item(session);
 
-    CU_ASSERT(NGHTTP2_GOAWAY == item->frame.hd.type);
-    CU_ASSERT(NGHTTP2_DEFAULT_STREAM_RESET_BURST * 2 + 1 ==
-              item->frame.goaway.last_stream_id);
+    assert_uint8(NGHTTP2_GOAWAY, ==, item->frame.hd.type);
+    assert_int32(NGHTTP2_DEFAULT_STREAM_RESET_BURST * 2 + 1, ==,
+                 item->frame.goaway.last_stream_id);
   }
 
   nghttp2_hd_deflate_free(&deflater);
@@ -12081,7 +12384,7 @@ static void check_nghttp2_http_recv_headers_fail(
     nghttp2_session *session, nghttp2_hd_deflater *deflater, int32_t stream_id,
     int stream_state, const nghttp2_nv *nva, size_t nvlen) {
   nghttp2_mem *mem;
-  ssize_t rv;
+  nghttp2_ssize rv;
   nghttp2_outbound_item *item;
   nghttp2_bufs bufs;
   my_user_data *ud;
@@ -12101,21 +12404,21 @@ static void check_nghttp2_http_recv_headers_fail(
 
   rv = pack_headers(&bufs, deflater, stream_id, NGHTTP2_FLAG_END_HEADERS, nva,
                     nvlen, mem);
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   ud->invalid_frame_recv_cb_called = 0;
 
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_buf_len(&bufs.head->buf));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_buf_len(&bufs.head->buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&bufs.head->buf) == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&bufs.head->buf), ==, rv);
 
   item = nghttp2_session_get_next_ob_item(session);
 
-  CU_ASSERT(NGHTTP2_RST_STREAM == item->frame.hd.type);
-  CU_ASSERT(1 == ud->invalid_frame_recv_cb_called);
+  assert_uint8(NGHTTP2_RST_STREAM, ==, item->frame.hd.type);
+  assert_ptrdiff(1, ==, ud->invalid_frame_recv_cb_called);
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
 
   nghttp2_bufs_free(&bufs);
 }
@@ -12124,7 +12427,7 @@ static void check_nghttp2_http_recv_headers_ok(
     nghttp2_session *session, nghttp2_hd_deflater *deflater, int32_t stream_id,
     int stream_state, const nghttp2_nv *nva, size_t nvlen) {
   nghttp2_mem *mem;
-  ssize_t rv;
+  nghttp2_ssize rv;
   nghttp2_bufs bufs;
   my_user_data *ud;
 
@@ -12143,16 +12446,16 @@ static void check_nghttp2_http_recv_headers_ok(
 
   rv = pack_headers(&bufs, deflater, stream_id, NGHTTP2_FLAG_END_HEADERS, nva,
                     nvlen, mem);
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   ud->frame_recv_cb_called = 0;
 
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_buf_len(&bufs.head->buf));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_buf_len(&bufs.head->buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&bufs.head->buf) == rv);
-  CU_ASSERT(NULL == nghttp2_session_get_next_ob_item(session));
-  CU_ASSERT(1 == ud->frame_recv_cb_called);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&bufs.head->buf), ==, rv);
+  assert_null(nghttp2_session_get_next_ob_item(session));
+  assert_int(1, ==, ud->frame_recv_cb_called);
 
   nghttp2_bufs_free(&bufs);
 }
@@ -12255,7 +12558,7 @@ void test_nghttp2_http_mandatory_headers(void) {
   mem = nghttp2_mem_default();
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
   callbacks.on_frame_recv_callback = on_frame_recv_callback;
   callbacks.on_invalid_frame_recv_callback = on_invalid_frame_recv_callback;
 
@@ -12459,7 +12762,7 @@ void test_nghttp2_http_content_length(void) {
   nghttp2_hd_deflater deflater;
   nghttp2_mem *mem;
   nghttp2_bufs bufs;
-  ssize_t rv;
+  nghttp2_ssize rv;
   nghttp2_stream *stream;
   const nghttp2_nv cl_resnv[] = {MAKE_NV(":status", "200"),
                                  MAKE_NV("te", "trailers"),
@@ -12473,7 +12776,7 @@ void test_nghttp2_http_content_length(void) {
   frame_pack_bufs_init(&bufs);
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   nghttp2_session_client_new(&session, &callbacks, NULL);
 
@@ -12483,15 +12786,15 @@ void test_nghttp2_http_content_length(void) {
 
   rv = pack_headers(&bufs, &deflater, 1, NGHTTP2_FLAG_END_HEADERS, cl_resnv,
                     ARRLEN(cl_resnv), mem);
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_buf_len(&bufs.head->buf));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_buf_len(&bufs.head->buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&bufs.head->buf) == rv);
-  CU_ASSERT(NULL == nghttp2_session_get_next_ob_item(session));
-  CU_ASSERT(9000000000LL == stream->content_length);
-  CU_ASSERT(200 == stream->status_code);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&bufs.head->buf), ==, rv);
+  assert_null(nghttp2_session_get_next_ob_item(session));
+  assert_int64(9000000000LL, ==, stream->content_length);
+  assert_int16(200, ==, stream->status_code);
 
   nghttp2_hd_deflate_free(&deflater);
 
@@ -12506,17 +12809,17 @@ void test_nghttp2_http_content_length(void) {
 
   rv = pack_headers(&bufs, &deflater, 1, NGHTTP2_FLAG_END_HEADERS, cl_reqnv,
                     ARRLEN(cl_reqnv), mem);
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_buf_len(&bufs.head->buf));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_buf_len(&bufs.head->buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&bufs.head->buf) == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&bufs.head->buf), ==, rv);
 
   stream = nghttp2_session_get_stream(session, 1);
 
-  CU_ASSERT(NULL == nghttp2_session_get_next_ob_item(session));
-  CU_ASSERT(9000000000LL == stream->content_length);
+  assert_null(nghttp2_session_get_next_ob_item(session));
+  assert_int64(9000000000LL, ==, stream->content_length);
 
   nghttp2_hd_deflate_free(&deflater);
 
@@ -12531,7 +12834,7 @@ void test_nghttp2_http_content_length_mismatch(void) {
   nghttp2_hd_deflater deflater;
   nghttp2_mem *mem;
   nghttp2_bufs bufs;
-  ssize_t rv;
+  nghttp2_ssize rv;
   const nghttp2_nv cl_reqnv[] = {
       MAKE_NV(":path", "/"), MAKE_NV(":method", "PUT"),
       MAKE_NV(":authority", "localhost"), MAKE_NV(":scheme", "https"),
@@ -12545,7 +12848,7 @@ void test_nghttp2_http_content_length_mismatch(void) {
   frame_pack_bufs_init(&bufs);
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   nghttp2_session_server_new(&session, &callbacks, NULL);
 
@@ -12555,59 +12858,59 @@ void test_nghttp2_http_content_length_mismatch(void) {
   rv = pack_headers(&bufs, &deflater, 1,
                     NGHTTP2_FLAG_END_HEADERS | NGHTTP2_FLAG_END_STREAM,
                     cl_reqnv, ARRLEN(cl_reqnv), mem);
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_buf_len(&bufs.head->buf));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_buf_len(&bufs.head->buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&bufs.head->buf) == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&bufs.head->buf), ==, rv);
 
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(NGHTTP2_RST_STREAM == item->frame.hd.type);
+  assert_uint8(NGHTTP2_RST_STREAM, ==, item->frame.hd.type);
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
 
   nghttp2_bufs_reset(&bufs);
 
   /* header says content-length: 20, but DATA has 0 byte */
   rv = pack_headers(&bufs, &deflater, 3, NGHTTP2_FLAG_END_HEADERS, cl_reqnv,
                     ARRLEN(cl_reqnv), mem);
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   nghttp2_frame_hd_init(&hd, 0, NGHTTP2_DATA, NGHTTP2_FLAG_END_STREAM, 3);
   nghttp2_frame_pack_frame_hd(bufs.head->buf.last, &hd);
   bufs.head->buf.last += NGHTTP2_FRAME_HDLEN;
 
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_buf_len(&bufs.head->buf));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_buf_len(&bufs.head->buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&bufs.head->buf) == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&bufs.head->buf), ==, rv);
 
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(NGHTTP2_RST_STREAM == item->frame.hd.type);
+  assert_uint8(NGHTTP2_RST_STREAM, ==, item->frame.hd.type);
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
 
   nghttp2_bufs_reset(&bufs);
 
   /* header says content-length: 20, but DATA has 21 bytes */
   rv = pack_headers(&bufs, &deflater, 5, NGHTTP2_FLAG_END_HEADERS, cl_reqnv,
                     ARRLEN(cl_reqnv), mem);
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   nghttp2_frame_hd_init(&hd, 21, NGHTTP2_DATA, NGHTTP2_FLAG_END_STREAM, 5);
   nghttp2_frame_pack_frame_hd(bufs.head->buf.last, &hd);
   bufs.head->buf.last += NGHTTP2_FRAME_HDLEN + 21;
 
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_buf_len(&bufs.head->buf));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_buf_len(&bufs.head->buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&bufs.head->buf) == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&bufs.head->buf), ==, rv);
 
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(NGHTTP2_RST_STREAM == item->frame.hd.type);
+  assert_uint8(NGHTTP2_RST_STREAM, ==, item->frame.hd.type);
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
 
   nghttp2_bufs_reset(&bufs);
 
@@ -12621,83 +12924,83 @@ void test_nghttp2_http_content_length_mismatch(void) {
   nghttp2_hd_deflate_init(&deflater, mem);
 
   /* header says content-length: 20, but HEADERS has END_STREAM flag set */
-  nghttp2_submit_request(session, NULL, reqnv, ARRLEN(reqnv), NULL, NULL);
+  nghttp2_submit_request2(session, NULL, reqnv, ARRLEN(reqnv), NULL, NULL);
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
 
   rv = pack_headers(&bufs, &deflater, 1,
                     NGHTTP2_FLAG_END_HEADERS | NGHTTP2_FLAG_END_STREAM,
                     cl_resnv, ARRLEN(cl_resnv), mem);
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_buf_len(&bufs.head->buf));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_buf_len(&bufs.head->buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&bufs.head->buf) == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&bufs.head->buf), ==, rv);
 
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(NGHTTP2_RST_STREAM == item->frame.hd.type);
+  assert_uint8(NGHTTP2_RST_STREAM, ==, item->frame.hd.type);
 
-  CU_ASSERT(NULL != nghttp2_session_get_stream(session, 1));
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_not_null(nghttp2_session_get_stream(session, 1));
+  assert_int(0, ==, nghttp2_session_send(session));
   /* After sending RST_STREAM, stream must be closed */
-  CU_ASSERT(NULL == nghttp2_session_get_stream(session, 1));
+  assert_null(nghttp2_session_get_stream(session, 1));
 
   nghttp2_bufs_reset(&bufs);
 
   /* header says content-length: 20, but DATA has 0 byte */
-  nghttp2_submit_request(session, NULL, reqnv, ARRLEN(reqnv), NULL, NULL);
+  nghttp2_submit_request2(session, NULL, reqnv, ARRLEN(reqnv), NULL, NULL);
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
 
   rv = pack_headers(&bufs, &deflater, 3, NGHTTP2_FLAG_END_HEADERS, cl_resnv,
                     ARRLEN(cl_resnv), mem);
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   nghttp2_frame_hd_init(&hd, 0, NGHTTP2_DATA, NGHTTP2_FLAG_END_STREAM, 3);
   nghttp2_frame_pack_frame_hd(bufs.head->buf.last, &hd);
   bufs.head->buf.last += NGHTTP2_FRAME_HDLEN;
 
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_buf_len(&bufs.head->buf));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_buf_len(&bufs.head->buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&bufs.head->buf) == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&bufs.head->buf), ==, rv);
 
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(NGHTTP2_RST_STREAM == item->frame.hd.type);
+  assert_uint8(NGHTTP2_RST_STREAM, ==, item->frame.hd.type);
 
-  CU_ASSERT(NULL != nghttp2_session_get_stream(session, 3));
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_not_null(nghttp2_session_get_stream(session, 3));
+  assert_int(0, ==, nghttp2_session_send(session));
   /* After sending RST_STREAM, stream must be closed */
-  CU_ASSERT(NULL == nghttp2_session_get_stream(session, 3));
+  assert_null(nghttp2_session_get_stream(session, 3));
 
   nghttp2_bufs_reset(&bufs);
 
   /* header says content-length: 20, but DATA has 21 bytes */
-  nghttp2_submit_request(session, NULL, reqnv, ARRLEN(reqnv), NULL, NULL);
+  nghttp2_submit_request2(session, NULL, reqnv, ARRLEN(reqnv), NULL, NULL);
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
 
   rv = pack_headers(&bufs, &deflater, 5, NGHTTP2_FLAG_END_HEADERS, cl_resnv,
                     ARRLEN(cl_resnv), mem);
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   nghttp2_frame_hd_init(&hd, 21, NGHTTP2_DATA, NGHTTP2_FLAG_END_STREAM, 5);
   nghttp2_frame_pack_frame_hd(bufs.head->buf.last, &hd);
   bufs.head->buf.last += NGHTTP2_FRAME_HDLEN + 21;
 
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_buf_len(&bufs.head->buf));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_buf_len(&bufs.head->buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&bufs.head->buf) == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&bufs.head->buf), ==, rv);
 
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(NGHTTP2_RST_STREAM == item->frame.hd.type);
+  assert_uint8(NGHTTP2_RST_STREAM, ==, item->frame.hd.type);
 
-  CU_ASSERT(NULL != nghttp2_session_get_stream(session, 5));
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_not_null(nghttp2_session_get_stream(session, 5));
+  assert_int(0, ==, nghttp2_session_send(session));
   /* After sending RST_STREAM, stream must be closed */
-  CU_ASSERT(NULL == nghttp2_session_get_stream(session, 5));
+  assert_null(nghttp2_session_get_stream(session, 5));
 
   nghttp2_bufs_reset(&bufs);
 
@@ -12714,7 +13017,7 @@ void test_nghttp2_http_non_final_response(void) {
   nghttp2_hd_deflater deflater;
   nghttp2_mem *mem;
   nghttp2_bufs bufs;
-  ssize_t rv;
+  nghttp2_ssize rv;
   const nghttp2_nv nonfinal_resnv[] = {
       MAKE_NV(":status", "100"),
   };
@@ -12725,7 +13028,7 @@ void test_nghttp2_http_non_final_response(void) {
   frame_pack_bufs_init(&bufs);
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   nghttp2_session_client_new(&session, &callbacks, NULL);
 
@@ -12737,17 +13040,17 @@ void test_nghttp2_http_non_final_response(void) {
   rv = pack_headers(&bufs, &deflater, 1,
                     NGHTTP2_FLAG_END_HEADERS | NGHTTP2_FLAG_END_STREAM,
                     nonfinal_resnv, ARRLEN(nonfinal_resnv), mem);
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_buf_len(&bufs.head->buf));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_buf_len(&bufs.head->buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&bufs.head->buf) == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&bufs.head->buf), ==, rv);
 
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(NGHTTP2_RST_STREAM == item->frame.hd.type);
+  assert_uint8(NGHTTP2_RST_STREAM, ==, item->frame.hd.type);
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
 
   nghttp2_bufs_reset(&bufs);
 
@@ -12756,21 +13059,21 @@ void test_nghttp2_http_non_final_response(void) {
 
   rv = pack_headers(&bufs, &deflater, 3, NGHTTP2_FLAG_END_HEADERS,
                     nonfinal_resnv, ARRLEN(nonfinal_resnv), mem);
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   nghttp2_frame_hd_init(&hd, 10, NGHTTP2_DATA, NGHTTP2_FLAG_END_STREAM, 3);
   nghttp2_frame_pack_frame_hd(bufs.head->buf.last, &hd);
   bufs.head->buf.last += NGHTTP2_FRAME_HDLEN + 10;
 
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_buf_len(&bufs.head->buf));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_buf_len(&bufs.head->buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&bufs.head->buf) == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&bufs.head->buf), ==, rv);
 
   item = nghttp2_session_get_next_ob_item(session);
-  CU_ASSERT(NGHTTP2_RST_STREAM == item->frame.hd.type);
+  assert_uint8(NGHTTP2_RST_STREAM, ==, item->frame.hd.type);
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
 
   nghttp2_bufs_reset(&bufs);
 
@@ -12780,18 +13083,18 @@ void test_nghttp2_http_non_final_response(void) {
 
   rv = pack_headers(&bufs, &deflater, 5, NGHTTP2_FLAG_END_HEADERS,
                     nonfinal_resnv, ARRLEN(nonfinal_resnv), mem);
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   nghttp2_frame_hd_init(&hd, 0, NGHTTP2_DATA, NGHTTP2_FLAG_NONE, 5);
   nghttp2_frame_pack_frame_hd(bufs.head->buf.last, &hd);
   bufs.head->buf.last += NGHTTP2_FRAME_HDLEN;
 
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_buf_len(&bufs.head->buf));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_buf_len(&bufs.head->buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&bufs.head->buf) == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&bufs.head->buf), ==, rv);
 
-  CU_ASSERT(NULL == nghttp2_session_get_next_ob_item(session));
+  assert_null(nghttp2_session_get_next_ob_item(session));
 
   nghttp2_bufs_reset(&bufs);
 
@@ -12801,22 +13104,22 @@ void test_nghttp2_http_non_final_response(void) {
 
   rv = pack_headers(&bufs, &deflater, 7, NGHTTP2_FLAG_END_HEADERS,
                     nonfinal_resnv, ARRLEN(nonfinal_resnv), mem);
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   nghttp2_frame_hd_init(&hd, 0, NGHTTP2_DATA, NGHTTP2_FLAG_END_STREAM, 7);
   nghttp2_frame_pack_frame_hd(bufs.head->buf.last, &hd);
   bufs.head->buf.last += NGHTTP2_FRAME_HDLEN;
 
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_buf_len(&bufs.head->buf));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_buf_len(&bufs.head->buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&bufs.head->buf) == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&bufs.head->buf), ==, rv);
 
   item = nghttp2_session_get_next_ob_item(session);
 
-  CU_ASSERT(NGHTTP2_RST_STREAM == item->frame.hd.type);
+  assert_uint8(NGHTTP2_RST_STREAM, ==, item->frame.hd.type);
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
 
   nghttp2_bufs_reset(&bufs);
 
@@ -12825,25 +13128,25 @@ void test_nghttp2_http_non_final_response(void) {
 
   rv = pack_headers(&bufs, &deflater, 9, NGHTTP2_FLAG_END_HEADERS,
                     nonfinal_resnv, ARRLEN(nonfinal_resnv), mem);
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_buf_len(&bufs.head->buf));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_buf_len(&bufs.head->buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&bufs.head->buf) == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&bufs.head->buf), ==, rv);
 
   nghttp2_bufs_reset(&bufs);
 
   rv = pack_headers(&bufs, &deflater, 9, NGHTTP2_FLAG_END_HEADERS, resnv,
                     ARRLEN(resnv), mem);
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_buf_len(&bufs.head->buf));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_buf_len(&bufs.head->buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&bufs.head->buf) == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&bufs.head->buf), ==, rv);
 
-  CU_ASSERT(NULL == nghttp2_session_get_next_ob_item(session));
+  assert_null(nghttp2_session_get_next_ob_item(session));
 
   nghttp2_bufs_reset(&bufs);
 
@@ -12860,7 +13163,7 @@ void test_nghttp2_http_trailer_headers(void) {
   nghttp2_hd_deflater deflater;
   nghttp2_mem *mem;
   nghttp2_bufs bufs;
-  ssize_t rv;
+  nghttp2_ssize rv;
   const nghttp2_nv trailer_reqnv[] = {
       MAKE_NV("foo", "bar"),
   };
@@ -12870,7 +13173,7 @@ void test_nghttp2_http_trailer_headers(void) {
   frame_pack_bufs_init(&bufs);
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   nghttp2_session_server_new(&session, &callbacks, NULL);
 
@@ -12879,84 +13182,84 @@ void test_nghttp2_http_trailer_headers(void) {
   /* good trailer header */
   rv = pack_headers(&bufs, &deflater, 1, NGHTTP2_FLAG_END_HEADERS, reqnv,
                     ARRLEN(reqnv), mem);
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_buf_len(&bufs.head->buf));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_buf_len(&bufs.head->buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&bufs.head->buf) == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&bufs.head->buf), ==, rv);
 
   nghttp2_bufs_reset(&bufs);
 
   rv = pack_headers(&bufs, &deflater, 1,
                     NGHTTP2_FLAG_END_HEADERS | NGHTTP2_FLAG_END_STREAM,
                     trailer_reqnv, ARRLEN(trailer_reqnv), mem);
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_buf_len(&bufs.head->buf));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_buf_len(&bufs.head->buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&bufs.head->buf) == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&bufs.head->buf), ==, rv);
 
-  CU_ASSERT(NULL == nghttp2_session_get_next_ob_item(session));
+  assert_null(nghttp2_session_get_next_ob_item(session));
 
   nghttp2_bufs_reset(&bufs);
 
   /* trailer header without END_STREAM is illegal */
   rv = pack_headers(&bufs, &deflater, 3, NGHTTP2_FLAG_END_HEADERS, reqnv,
                     ARRLEN(reqnv), mem);
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_buf_len(&bufs.head->buf));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_buf_len(&bufs.head->buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&bufs.head->buf) == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&bufs.head->buf), ==, rv);
 
   nghttp2_bufs_reset(&bufs);
 
   rv = pack_headers(&bufs, &deflater, 3, NGHTTP2_FLAG_END_HEADERS,
                     trailer_reqnv, ARRLEN(trailer_reqnv), mem);
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_buf_len(&bufs.head->buf));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_buf_len(&bufs.head->buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&bufs.head->buf) == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&bufs.head->buf), ==, rv);
 
   item = nghttp2_session_get_next_ob_item(session);
 
-  CU_ASSERT(NGHTTP2_RST_STREAM == item->frame.hd.type);
+  assert_uint8(NGHTTP2_RST_STREAM, ==, item->frame.hd.type);
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
 
   nghttp2_bufs_reset(&bufs);
 
   /* trailer header including pseudo header field is illegal */
   rv = pack_headers(&bufs, &deflater, 5, NGHTTP2_FLAG_END_HEADERS, reqnv,
                     ARRLEN(reqnv), mem);
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_buf_len(&bufs.head->buf));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_buf_len(&bufs.head->buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&bufs.head->buf) == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&bufs.head->buf), ==, rv);
 
   nghttp2_bufs_reset(&bufs);
 
   rv = pack_headers(&bufs, &deflater, 5, NGHTTP2_FLAG_END_HEADERS, reqnv,
                     ARRLEN(reqnv), mem);
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_buf_len(&bufs.head->buf));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_buf_len(&bufs.head->buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&bufs.head->buf) == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&bufs.head->buf), ==, rv);
 
   item = nghttp2_session_get_next_ob_item(session);
 
-  CU_ASSERT(NGHTTP2_RST_STREAM == item->frame.hd.type);
+  assert_uint8(NGHTTP2_RST_STREAM, ==, item->frame.hd.type);
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
 
   nghttp2_bufs_reset(&bufs);
 
@@ -12973,7 +13276,7 @@ void test_nghttp2_http_ignore_regular_header(void) {
   nghttp2_hd_deflater deflater;
   nghttp2_mem *mem;
   nghttp2_bufs bufs;
-  ssize_t rv;
+  nghttp2_ssize rv;
   my_user_data ud;
   const nghttp2_nv bad_reqnv[] = {
       MAKE_NV(":authority", "localhost"),
@@ -12994,7 +13297,7 @@ void test_nghttp2_http_ignore_regular_header(void) {
   frame_pack_bufs_init(&bufs);
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
   callbacks.on_header_callback = pause_on_header_callback;
 
   nghttp2_session_server_new(&session, &callbacks, &ud);
@@ -13004,32 +13307,32 @@ void test_nghttp2_http_ignore_regular_header(void) {
                     NGHTTP2_FLAG_END_HEADERS | NGHTTP2_FLAG_END_STREAM,
                     bad_reqnv, ARRLEN(bad_reqnv), mem);
 
-  CU_ASSERT_FATAL(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
   nghttp2_hd_deflate_free(&deflater);
 
   proclen = 0;
 
   for (i = 0; i < 4; ++i) {
-    rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos + proclen,
-                                  nghttp2_buf_len(&bufs.head->buf) - proclen);
-    CU_ASSERT_FATAL(rv > 0);
+    rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos + proclen,
+                                   nghttp2_buf_len(&bufs.head->buf) - proclen);
+    assert_ptrdiff(0, <, rv);
     proclen += (size_t)rv;
-    CU_ASSERT(nghttp2_nv_equal(&bad_ansnv[i], &ud.nv));
+    assert_true(nghttp2_nv_equal(&bad_ansnv[i], &ud.nv));
   }
 
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos + proclen,
-                                nghttp2_buf_len(&bufs.head->buf) - proclen);
-  CU_ASSERT_FATAL(rv > 0);
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos + proclen,
+                                 nghttp2_buf_len(&bufs.head->buf) - proclen);
+  assert_ptrdiff(0, <, rv);
   /* Without on_invalid_frame_recv_callback, bad header causes stream
      reset */
   item = nghttp2_session_get_next_ob_item(session);
 
-  CU_ASSERT(NGHTTP2_RST_STREAM == item->frame.hd.type);
+  assert_uint8(NGHTTP2_RST_STREAM, ==, item->frame.hd.type);
 
   proclen += (size_t)rv;
 
-  CU_ASSERT(nghttp2_buf_len(&bufs.head->buf) == proclen);
+  assert_size(nghttp2_buf_len(&bufs.head->buf), ==, proclen);
 
   nghttp2_session_del(session);
 
@@ -13043,29 +13346,29 @@ void test_nghttp2_http_ignore_regular_header(void) {
   ud.invalid_header_cb_called = 0;
 
   for (i = 0; i < 4; ++i) {
-    rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos + proclen,
-                                  nghttp2_buf_len(&bufs.head->buf) - proclen);
-    CU_ASSERT_FATAL(rv > 0);
+    rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos + proclen,
+                                   nghttp2_buf_len(&bufs.head->buf) - proclen);
+    assert_ptrdiff(0, <, rv);
     proclen += (size_t)rv;
-    CU_ASSERT(nghttp2_nv_equal(&bad_ansnv[i], &ud.nv));
+    assert_true(nghttp2_nv_equal(&bad_ansnv[i], &ud.nv));
   }
 
-  CU_ASSERT(0 == ud.invalid_header_cb_called);
+  assert_int(0, ==, ud.invalid_header_cb_called);
 
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos + proclen,
-                                nghttp2_buf_len(&bufs.head->buf) - proclen);
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos + proclen,
+                                 nghttp2_buf_len(&bufs.head->buf) - proclen);
 
-  CU_ASSERT_FATAL(rv > 0);
-  CU_ASSERT(1 == ud.invalid_header_cb_called);
-  CU_ASSERT(nghttp2_nv_equal(&bad_reqnv[4], &ud.nv));
+  assert_ptrdiff(0, <, rv);
+  assert_int(1, ==, ud.invalid_header_cb_called);
+  assert_true(nghttp2_nv_equal(&bad_reqnv[4], &ud.nv));
 
   proclen += (size_t)rv;
 
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos + proclen,
-                                nghttp2_buf_len(&bufs.head->buf) - proclen);
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos + proclen,
+                                 nghttp2_buf_len(&bufs.head->buf) - proclen);
 
-  CU_ASSERT(rv > 0);
-  CU_ASSERT(nghttp2_nv_equal(&bad_ansnv[4], &ud.nv));
+  assert_ptrdiff(0, <, rv);
+  assert_true(nghttp2_nv_equal(&bad_ansnv[4], &ud.nv));
 
   nghttp2_session_del(session);
 
@@ -13076,15 +13379,15 @@ void test_nghttp2_http_ignore_regular_header(void) {
 
   nghttp2_session_server_new(&session, &callbacks, &ud);
 
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_buf_len(&bufs.head->buf));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_buf_len(&bufs.head->buf));
 
-  CU_ASSERT(rv == (ssize_t)nghttp2_buf_len(&bufs.head->buf));
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&bufs.head->buf), ==, rv);
 
   item = nghttp2_session_get_next_ob_item(session);
 
-  CU_ASSERT(NGHTTP2_RST_STREAM == item->frame.hd.type);
-  CU_ASSERT(1 == item->frame.hd.stream_id);
+  assert_uint8(NGHTTP2_RST_STREAM, ==, item->frame.hd.type);
+  assert_int32(1, ==, item->frame.hd.stream_id);
 
   nghttp2_session_del(session);
   nghttp2_bufs_free(&bufs);
@@ -13096,7 +13399,7 @@ void test_nghttp2_http_ignore_content_length(void) {
   nghttp2_hd_deflater deflater;
   nghttp2_mem *mem;
   nghttp2_bufs bufs;
-  ssize_t rv;
+  nghttp2_ssize rv;
   const nghttp2_nv cl_resnv[] = {MAKE_NV(":status", "304"),
                                  MAKE_NV("content-length", "20")};
   const nghttp2_nv conn_reqnv[] = {MAKE_NV(":authority", "localhost"),
@@ -13110,7 +13413,7 @@ void test_nghttp2_http_ignore_content_length(void) {
   frame_pack_bufs_init(&bufs);
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   nghttp2_session_client_new(&session, &callbacks, NULL);
 
@@ -13122,14 +13425,14 @@ void test_nghttp2_http_ignore_content_length(void) {
   rv = pack_headers(&bufs, &deflater, 1,
                     NGHTTP2_FLAG_END_HEADERS | NGHTTP2_FLAG_END_STREAM,
                     cl_resnv, ARRLEN(cl_resnv), mem);
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_buf_len(&bufs.head->buf));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_buf_len(&bufs.head->buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&bufs.head->buf) == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&bufs.head->buf), ==, rv);
 
-  CU_ASSERT(NULL == nghttp2_session_get_next_ob_item(session));
+  assert_null(nghttp2_session_get_next_ob_item(session));
 
   nghttp2_bufs_reset(&bufs);
 
@@ -13139,15 +13442,15 @@ void test_nghttp2_http_ignore_content_length(void) {
 
   rv = pack_headers(&bufs, &deflater, 3, NGHTTP2_FLAG_END_HEADERS,
                     conn_cl_resnv, ARRLEN(conn_cl_resnv), mem);
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_buf_len(&bufs.head->buf));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_buf_len(&bufs.head->buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&bufs.head->buf) == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&bufs.head->buf), ==, rv);
 
-  CU_ASSERT(NULL == nghttp2_session_get_next_ob_item(session));
-  CU_ASSERT(-1 == stream->content_length);
+  assert_null(nghttp2_session_get_next_ob_item(session));
+  assert_int64(-1, ==, stream->content_length);
 
   nghttp2_bufs_reset(&bufs);
 
@@ -13162,19 +13465,19 @@ void test_nghttp2_http_ignore_content_length(void) {
   rv = pack_headers(&bufs, &deflater, 1, NGHTTP2_FLAG_END_HEADERS, conn_reqnv,
                     ARRLEN(conn_reqnv), mem);
 
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_buf_len(&bufs.head->buf));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_buf_len(&bufs.head->buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&bufs.head->buf) == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&bufs.head->buf), ==, rv);
 
-  CU_ASSERT(NULL == nghttp2_session_get_next_ob_item(session));
+  assert_null(nghttp2_session_get_next_ob_item(session));
 
   stream = nghttp2_session_get_stream(session, 1);
 
-  CU_ASSERT(-1 == stream->content_length);
-  CU_ASSERT((stream->http_flags & NGHTTP2_HTTP_FLAG_METH_CONNECT) > 0);
+  assert_int64(-1, ==, stream->content_length);
+  assert_true(stream->http_flags & NGHTTP2_HTTP_FLAG_METH_CONNECT);
 
   nghttp2_hd_deflate_free(&deflater);
   nghttp2_session_del(session);
@@ -13189,7 +13492,7 @@ void test_nghttp2_http_record_request_method(void) {
   const nghttp2_nv conn_resnv[] = {MAKE_NV(":status", "200"),
                                    MAKE_NV("content-length", "9999")};
   nghttp2_stream *stream;
-  ssize_t rv;
+  nghttp2_ssize rv;
   nghttp2_bufs bufs;
   nghttp2_hd_deflater deflater;
   nghttp2_mem *mem;
@@ -13199,37 +13502,38 @@ void test_nghttp2_http_record_request_method(void) {
   frame_pack_bufs_init(&bufs);
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   nghttp2_session_client_new(&session, &callbacks, NULL);
 
   nghttp2_hd_deflate_init(&deflater, mem);
 
-  CU_ASSERT(1 == nghttp2_submit_request(session, NULL, conn_reqnv,
-                                        ARRLEN(conn_reqnv), NULL, NULL));
+  assert_int32(1, ==,
+               nghttp2_submit_request2(session, NULL, conn_reqnv,
+                                       ARRLEN(conn_reqnv), NULL, NULL));
 
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_int(0, ==, nghttp2_session_send(session));
 
   stream = nghttp2_session_get_stream(session, 1);
 
-  CU_ASSERT(NGHTTP2_HTTP_FLAG_METH_CONNECT == stream->http_flags);
+  assert_uint32(NGHTTP2_HTTP_FLAG_METH_CONNECT, ==, stream->http_flags);
 
   rv = pack_headers(&bufs, &deflater, 1, NGHTTP2_FLAG_END_HEADERS, conn_resnv,
                     ARRLEN(conn_resnv), mem);
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_buf_len(&bufs.head->buf));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_buf_len(&bufs.head->buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&bufs.head->buf) == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&bufs.head->buf), ==, rv);
 
-  CU_ASSERT((NGHTTP2_HTTP_FLAG_METH_CONNECT & stream->http_flags) > 0);
-  CU_ASSERT(-1 == stream->content_length);
+  assert_true(NGHTTP2_HTTP_FLAG_METH_CONNECT & stream->http_flags);
+  assert_int64(-1, ==, stream->content_length);
 
   /* content-length is ignored in 200 response to a CONNECT request */
   item = nghttp2_session_get_next_ob_item(session);
 
-  CU_ASSERT(NULL == item);
+  assert_null(item);
 
   nghttp2_hd_deflate_free(&deflater);
   nghttp2_session_del(session);
@@ -13242,7 +13546,7 @@ void test_nghttp2_http_push_promise(void) {
   nghttp2_hd_deflater deflater;
   nghttp2_mem *mem;
   nghttp2_bufs bufs;
-  ssize_t rv;
+  nghttp2_ssize rv;
   nghttp2_stream *stream;
   const nghttp2_nv bad_reqnv[] = {MAKE_NV(":method", "GET")};
   nghttp2_outbound_item *item;
@@ -13251,7 +13555,7 @@ void test_nghttp2_http_push_promise(void) {
   frame_pack_bufs_init(&bufs);
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   /* good PUSH_PROMISE case */
   nghttp2_session_client_new(&session, &callbacks, NULL);
@@ -13262,33 +13566,33 @@ void test_nghttp2_http_push_promise(void) {
 
   rv = pack_push_promise(&bufs, &deflater, 1, NGHTTP2_FLAG_END_HEADERS, 2,
                          reqnv, ARRLEN(reqnv), mem);
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_buf_len(&bufs.head->buf));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_buf_len(&bufs.head->buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&bufs.head->buf) == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&bufs.head->buf), ==, rv);
 
-  CU_ASSERT(NULL == nghttp2_session_get_next_ob_item(session));
+  assert_null(nghttp2_session_get_next_ob_item(session));
 
   stream = nghttp2_session_get_stream(session, 2);
-  CU_ASSERT(NULL != stream);
+  assert_not_null(stream);
 
   nghttp2_bufs_reset(&bufs);
 
   rv = pack_headers(&bufs, &deflater, 2, NGHTTP2_FLAG_END_HEADERS, resnv,
                     ARRLEN(resnv), mem);
 
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_buf_len(&bufs.head->buf));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_buf_len(&bufs.head->buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&bufs.head->buf) == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&bufs.head->buf), ==, rv);
 
-  CU_ASSERT(NULL == nghttp2_session_get_next_ob_item(session));
+  assert_null(nghttp2_session_get_next_ob_item(session));
 
-  CU_ASSERT(200 == stream->status_code);
+  assert_int16(200, ==, stream->status_code);
 
   nghttp2_bufs_reset(&bufs);
 
@@ -13296,17 +13600,17 @@ void test_nghttp2_http_push_promise(void) {
   rv = pack_push_promise(&bufs, &deflater, 1, NGHTTP2_FLAG_END_HEADERS, 4,
                          bad_reqnv, ARRLEN(bad_reqnv), mem);
 
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_buf_len(&bufs.head->buf));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_buf_len(&bufs.head->buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&bufs.head->buf) == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&bufs.head->buf), ==, rv);
 
   item = nghttp2_session_get_next_ob_item(session);
 
-  CU_ASSERT(NGHTTP2_RST_STREAM == item->frame.hd.type);
-  CU_ASSERT(4 == item->frame.hd.stream_id);
+  assert_uint8(NGHTTP2_RST_STREAM, ==, item->frame.hd.type);
+  assert_int32(4, ==, item->frame.hd.stream_id);
 
   nghttp2_bufs_reset(&bufs);
 
@@ -13323,14 +13627,14 @@ void test_nghttp2_http_head_method_upgrade_workaround(void) {
   nghttp2_bufs bufs;
   nghttp2_hd_deflater deflater;
   nghttp2_mem *mem;
-  ssize_t rv;
+  nghttp2_ssize rv;
   nghttp2_stream *stream;
 
   mem = nghttp2_mem_default();
   frame_pack_bufs_init(&bufs);
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   nghttp2_session_client_new(&session, &callbacks, NULL);
 
@@ -13341,16 +13645,16 @@ void test_nghttp2_http_head_method_upgrade_workaround(void) {
   rv = pack_headers(&bufs, &deflater, 1, NGHTTP2_FLAG_END_HEADERS, cl_resnv,
                     ARRLEN(cl_resnv), mem);
 
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_buf_len(&bufs.head->buf));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_buf_len(&bufs.head->buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&bufs.head->buf) == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&bufs.head->buf), ==, rv);
 
   stream = nghttp2_session_get_stream(session, 1);
 
-  CU_ASSERT(-1 == stream->content_length);
+  assert_int64(-1, ==, stream->content_length);
 
   nghttp2_hd_deflate_free(&deflater);
   nghttp2_session_del(session);
@@ -13363,7 +13667,7 @@ void test_nghttp2_http_no_rfc9113_leading_and_trailing_ws_validation(void) {
   nghttp2_hd_deflater deflater;
   nghttp2_mem *mem;
   nghttp2_bufs bufs;
-  ssize_t rv;
+  nghttp2_ssize rv;
   const nghttp2_nv ws_reqnv[] = {
       MAKE_NV(":path", "/"),
       MAKE_NV(":method", "GET"),
@@ -13378,7 +13682,7 @@ void test_nghttp2_http_no_rfc9113_leading_and_trailing_ws_validation(void) {
   frame_pack_bufs_init(&bufs);
 
   memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
-  callbacks.send_callback = null_send_callback;
+  callbacks.send_callback2 = null_send_callback;
 
   /* By default, the leading and trailing white spaces validation is
      enabled as per RFC 9113. */
@@ -13390,17 +13694,17 @@ void test_nghttp2_http_no_rfc9113_leading_and_trailing_ws_validation(void) {
                     NGHTTP2_FLAG_END_HEADERS | NGHTTP2_FLAG_END_STREAM,
                     ws_reqnv, ARRLEN(ws_reqnv), mem);
 
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_buf_len(&bufs.head->buf));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_buf_len(&bufs.head->buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&bufs.head->buf) == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&bufs.head->buf), ==, rv);
 
   item = nghttp2_session_get_next_ob_item(session);
 
-  CU_ASSERT(NGHTTP2_RST_STREAM == item->frame.hd.type);
-  CU_ASSERT(0 == nghttp2_session_send(session));
+  assert_uint8(NGHTTP2_RST_STREAM, ==, item->frame.hd.type);
+  assert_int(0, ==, nghttp2_session_send(session));
 
   nghttp2_bufs_reset(&bufs);
   nghttp2_hd_deflate_free(&deflater);
@@ -13418,16 +13722,16 @@ void test_nghttp2_http_no_rfc9113_leading_and_trailing_ws_validation(void) {
                     NGHTTP2_FLAG_END_HEADERS | NGHTTP2_FLAG_END_STREAM,
                     ws_reqnv, ARRLEN(ws_reqnv), mem);
 
-  CU_ASSERT(0 == rv);
+  assert_ptrdiff(0, ==, rv);
 
-  rv = nghttp2_session_mem_recv(session, bufs.head->buf.pos,
-                                nghttp2_buf_len(&bufs.head->buf));
+  rv = nghttp2_session_mem_recv2(session, bufs.head->buf.pos,
+                                 nghttp2_buf_len(&bufs.head->buf));
 
-  CU_ASSERT((ssize_t)nghttp2_buf_len(&bufs.head->buf) == rv);
+  assert_ptrdiff((nghttp2_ssize)nghttp2_buf_len(&bufs.head->buf), ==, rv);
 
   item = nghttp2_session_get_next_ob_item(session);
 
-  CU_ASSERT(NULL == item);
+  assert_null(item);
 
   nghttp2_bufs_reset(&bufs);
   nghttp2_hd_deflate_free(&deflater);
diff --git a/tests/nghttp2_session_test.h b/tests/nghttp2_session_test.h
index be4fdf8..43befbe 100644
--- a/tests/nghttp2_session_test.h
+++ b/tests/nghttp2_session_test.h
@@ -29,156 +29,165 @@
 #  include <config.h>
 #endif /* HAVE_CONFIG_H */
 
-void test_nghttp2_session_recv(void);
-void test_nghttp2_session_recv_invalid_stream_id(void);
-void test_nghttp2_session_recv_invalid_frame(void);
-void test_nghttp2_session_recv_eof(void);
-void test_nghttp2_session_recv_data(void);
-void test_nghttp2_session_recv_data_no_auto_flow_control(void);
-void test_nghttp2_session_recv_continuation(void);
-void test_nghttp2_session_recv_headers_with_priority(void);
-void test_nghttp2_session_recv_headers_with_padding(void);
-void test_nghttp2_session_recv_headers_early_response(void);
-void test_nghttp2_session_recv_headers_for_closed_stream(void);
-void test_nghttp2_session_recv_headers_with_extpri(void);
-void test_nghttp2_session_server_recv_push_response(void);
-void test_nghttp2_session_recv_premature_headers(void);
-void test_nghttp2_session_recv_unknown_frame(void);
-void test_nghttp2_session_recv_unexpected_continuation(void);
-void test_nghttp2_session_recv_settings_header_table_size(void);
-void test_nghttp2_session_recv_too_large_frame_length(void);
-void test_nghttp2_session_recv_extension(void);
-void test_nghttp2_session_recv_altsvc(void);
-void test_nghttp2_session_recv_origin(void);
-void test_nghttp2_session_recv_priority_update(void);
-void test_nghttp2_session_continue(void);
-void test_nghttp2_session_add_frame(void);
-void test_nghttp2_session_on_request_headers_received(void);
-void test_nghttp2_session_on_response_headers_received(void);
-void test_nghttp2_session_on_headers_received(void);
-void test_nghttp2_session_on_push_response_headers_received(void);
-void test_nghttp2_session_on_priority_received(void);
-void test_nghttp2_session_on_rst_stream_received(void);
-void test_nghttp2_session_on_settings_received(void);
-void test_nghttp2_session_on_push_promise_received(void);
-void test_nghttp2_session_on_ping_received(void);
-void test_nghttp2_session_on_goaway_received(void);
-void test_nghttp2_session_on_window_update_received(void);
-void test_nghttp2_session_on_data_received(void);
-void test_nghttp2_session_on_data_received_fail_fast(void);
-void test_nghttp2_session_on_altsvc_received(void);
-void test_nghttp2_session_send_headers_start_stream(void);
-void test_nghttp2_session_send_headers_reply(void);
-void test_nghttp2_session_send_headers_frame_size_error(void);
-void test_nghttp2_session_send_headers_push_reply(void);
-void test_nghttp2_session_send_rst_stream(void);
-void test_nghttp2_session_send_push_promise(void);
-void test_nghttp2_session_is_my_stream_id(void);
-void test_nghttp2_session_upgrade2(void);
-void test_nghttp2_session_reprioritize_stream(void);
-void test_nghttp2_session_reprioritize_stream_with_idle_stream_dep(void);
-void test_nghttp2_submit_data(void);
-void test_nghttp2_submit_data_read_length_too_large(void);
-void test_nghttp2_submit_data_read_length_smallest(void);
-void test_nghttp2_submit_data_twice(void);
-void test_nghttp2_submit_request_with_data(void);
-void test_nghttp2_submit_request_without_data(void);
-void test_nghttp2_submit_response_with_data(void);
-void test_nghttp2_submit_response_without_data(void);
-void test_nghttp2_submit_response_push_response(void);
-void test_nghttp2_submit_trailer(void);
-void test_nghttp2_submit_headers_start_stream(void);
-void test_nghttp2_submit_headers_reply(void);
-void test_nghttp2_submit_headers_push_reply(void);
-void test_nghttp2_submit_headers(void);
-void test_nghttp2_submit_headers_continuation(void);
-void test_nghttp2_submit_headers_continuation_extra_large(void);
-void test_nghttp2_submit_priority(void);
-void test_nghttp2_submit_settings(void);
-void test_nghttp2_submit_settings_update_local_window_size(void);
-void test_nghttp2_submit_settings_multiple_times(void);
-void test_nghttp2_submit_push_promise(void);
-void test_nghttp2_submit_window_update(void);
-void test_nghttp2_submit_window_update_local_window_size(void);
-void test_nghttp2_submit_shutdown_notice(void);
-void test_nghttp2_submit_invalid_nv(void);
-void test_nghttp2_submit_extension(void);
-void test_nghttp2_submit_altsvc(void);
-void test_nghttp2_submit_origin(void);
-void test_nghttp2_submit_priority_update(void);
-void test_nghttp2_submit_rst_stream(void);
-void test_nghttp2_session_open_stream(void);
-void test_nghttp2_session_open_stream_with_idle_stream_dep(void);
-void test_nghttp2_session_get_next_ob_item(void);
-void test_nghttp2_session_pop_next_ob_item(void);
-void test_nghttp2_session_reply_fail(void);
-void test_nghttp2_session_max_concurrent_streams(void);
-void test_nghttp2_session_stop_data_with_rst_stream(void);
-void test_nghttp2_session_defer_data(void);
-void test_nghttp2_session_flow_control(void);
-void test_nghttp2_session_flow_control_data_recv(void);
-void test_nghttp2_session_flow_control_data_with_padding_recv(void);
-void test_nghttp2_session_data_read_temporal_failure(void);
-void test_nghttp2_session_on_stream_close(void);
-void test_nghttp2_session_on_ctrl_not_send(void);
-void test_nghttp2_session_get_outbound_queue_size(void);
-void test_nghttp2_session_get_effective_local_window_size(void);
-void test_nghttp2_session_set_option(void);
-void test_nghttp2_session_data_backoff_by_high_pri_frame(void);
-void test_nghttp2_session_pack_data_with_padding(void);
-void test_nghttp2_session_pack_headers_with_padding(void);
-void test_nghttp2_pack_settings_payload(void);
-void test_nghttp2_session_stream_dep_add(void);
-void test_nghttp2_session_stream_dep_remove(void);
-void test_nghttp2_session_stream_dep_add_subtree(void);
-void test_nghttp2_session_stream_dep_remove_subtree(void);
-void test_nghttp2_session_stream_dep_all_your_stream_are_belong_to_us(void);
-void test_nghttp2_session_stream_attach_item(void);
-void test_nghttp2_session_stream_attach_item_subtree(void);
-void test_nghttp2_session_stream_get_state(void);
-void test_nghttp2_session_stream_get_something(void);
-void test_nghttp2_session_find_stream(void);
-void test_nghttp2_session_keep_closed_stream(void);
-void test_nghttp2_session_keep_idle_stream(void);
-void test_nghttp2_session_detach_idle_stream(void);
-void test_nghttp2_session_large_dep_tree(void);
-void test_nghttp2_session_graceful_shutdown(void);
-void test_nghttp2_session_on_header_temporal_failure(void);
-void test_nghttp2_session_recv_client_magic(void);
-void test_nghttp2_session_delete_data_item(void);
-void test_nghttp2_session_open_idle_stream(void);
-void test_nghttp2_session_cancel_reserved_remote(void);
-void test_nghttp2_session_reset_pending_headers(void);
-void test_nghttp2_session_send_data_callback(void);
-void test_nghttp2_session_on_begin_headers_temporal_failure(void);
-void test_nghttp2_session_defer_then_close(void);
-void test_nghttp2_session_detach_item_from_closed_stream(void);
-void test_nghttp2_session_flooding(void);
-void test_nghttp2_session_change_stream_priority(void);
-void test_nghttp2_session_change_extpri_stream_priority(void);
-void test_nghttp2_session_create_idle_stream(void);
-void test_nghttp2_session_repeated_priority_change(void);
-void test_nghttp2_session_repeated_priority_submission(void);
-void test_nghttp2_session_set_local_window_size(void);
-void test_nghttp2_session_cancel_from_before_frame_send(void);
-void test_nghttp2_session_too_many_settings(void);
-void test_nghttp2_session_removed_closed_stream(void);
-void test_nghttp2_session_pause_data(void);
-void test_nghttp2_session_no_closed_streams(void);
-void test_nghttp2_session_set_stream_user_data(void);
-void test_nghttp2_session_no_rfc7540_priorities(void);
-void test_nghttp2_session_server_fallback_rfc7540_priorities(void);
-void test_nghttp2_session_stream_reset_ratelim(void);
-void test_nghttp2_http_mandatory_headers(void);
-void test_nghttp2_http_content_length(void);
-void test_nghttp2_http_content_length_mismatch(void);
-void test_nghttp2_http_non_final_response(void);
-void test_nghttp2_http_trailer_headers(void);
-void test_nghttp2_http_ignore_regular_header(void);
-void test_nghttp2_http_ignore_content_length(void);
-void test_nghttp2_http_record_request_method(void);
-void test_nghttp2_http_push_promise(void);
-void test_nghttp2_http_head_method_upgrade_workaround(void);
-void test_nghttp2_http_no_rfc9113_leading_and_trailing_ws_validation(void);
+#define MUNIT_ENABLE_ASSERT_ALIASES
+
+#include "munit.h"
+
+extern const MunitSuite session_suite;
+
+munit_void_test_decl(test_nghttp2_session_recv);
+munit_void_test_decl(test_nghttp2_session_recv_invalid_stream_id);
+munit_void_test_decl(test_nghttp2_session_recv_invalid_frame);
+munit_void_test_decl(test_nghttp2_session_recv_eof);
+munit_void_test_decl(test_nghttp2_session_recv_data);
+munit_void_test_decl(test_nghttp2_session_recv_data_no_auto_flow_control);
+munit_void_test_decl(test_nghttp2_session_recv_continuation);
+munit_void_test_decl(test_nghttp2_session_recv_headers_with_priority);
+munit_void_test_decl(test_nghttp2_session_recv_headers_with_padding);
+munit_void_test_decl(test_nghttp2_session_recv_headers_early_response);
+munit_void_test_decl(test_nghttp2_session_recv_headers_for_closed_stream);
+munit_void_test_decl(test_nghttp2_session_recv_headers_with_extpri);
+munit_void_test_decl(test_nghttp2_session_server_recv_push_response);
+munit_void_test_decl(test_nghttp2_session_recv_premature_headers);
+munit_void_test_decl(test_nghttp2_session_recv_unknown_frame);
+munit_void_test_decl(test_nghttp2_session_recv_unexpected_continuation);
+munit_void_test_decl(test_nghttp2_session_recv_settings_header_table_size);
+munit_void_test_decl(test_nghttp2_session_recv_too_large_frame_length);
+munit_void_test_decl(test_nghttp2_session_recv_extension);
+munit_void_test_decl(test_nghttp2_session_recv_altsvc);
+munit_void_test_decl(test_nghttp2_session_recv_origin);
+munit_void_test_decl(test_nghttp2_session_recv_priority_update);
+munit_void_test_decl(test_nghttp2_session_continue);
+munit_void_test_decl(test_nghttp2_session_add_frame);
+munit_void_test_decl(test_nghttp2_session_on_request_headers_received);
+munit_void_test_decl(test_nghttp2_session_on_response_headers_received);
+munit_void_test_decl(test_nghttp2_session_on_headers_received);
+munit_void_test_decl(test_nghttp2_session_on_push_response_headers_received);
+munit_void_test_decl(test_nghttp2_session_on_priority_received);
+munit_void_test_decl(test_nghttp2_session_on_rst_stream_received);
+munit_void_test_decl(test_nghttp2_session_on_settings_received);
+munit_void_test_decl(test_nghttp2_session_on_push_promise_received);
+munit_void_test_decl(test_nghttp2_session_on_ping_received);
+munit_void_test_decl(test_nghttp2_session_on_goaway_received);
+munit_void_test_decl(test_nghttp2_session_on_window_update_received);
+munit_void_test_decl(test_nghttp2_session_on_data_received);
+munit_void_test_decl(test_nghttp2_session_on_data_received_fail_fast);
+munit_void_test_decl(test_nghttp2_session_on_altsvc_received);
+munit_void_test_decl(test_nghttp2_session_send_headers_start_stream);
+munit_void_test_decl(test_nghttp2_session_send_headers_reply);
+munit_void_test_decl(test_nghttp2_session_send_headers_frame_size_error);
+munit_void_test_decl(test_nghttp2_session_send_headers_push_reply);
+munit_void_test_decl(test_nghttp2_session_send_rst_stream);
+munit_void_test_decl(test_nghttp2_session_send_push_promise);
+munit_void_test_decl(test_nghttp2_session_is_my_stream_id);
+munit_void_test_decl(test_nghttp2_session_upgrade2);
+munit_void_test_decl(test_nghttp2_session_reprioritize_stream);
+munit_void_test_decl(
+    test_nghttp2_session_reprioritize_stream_with_idle_stream_dep);
+munit_void_test_decl(test_nghttp2_submit_data);
+munit_void_test_decl(test_nghttp2_submit_data_read_length_too_large);
+munit_void_test_decl(test_nghttp2_submit_data_read_length_smallest);
+munit_void_test_decl(test_nghttp2_submit_data_twice);
+munit_void_test_decl(test_nghttp2_submit_request_with_data);
+munit_void_test_decl(test_nghttp2_submit_request_without_data);
+munit_void_test_decl(test_nghttp2_submit_response_with_data);
+munit_void_test_decl(test_nghttp2_submit_response_without_data);
+munit_void_test_decl(test_nghttp2_submit_response_push_response);
+munit_void_test_decl(test_nghttp2_submit_trailer);
+munit_void_test_decl(test_nghttp2_submit_headers_start_stream);
+munit_void_test_decl(test_nghttp2_submit_headers_reply);
+munit_void_test_decl(test_nghttp2_submit_headers_push_reply);
+munit_void_test_decl(test_nghttp2_submit_headers);
+munit_void_test_decl(test_nghttp2_submit_headers_continuation);
+munit_void_test_decl(test_nghttp2_submit_headers_continuation_extra_large);
+munit_void_test_decl(test_nghttp2_submit_priority);
+munit_void_test_decl(test_nghttp2_submit_settings);
+munit_void_test_decl(test_nghttp2_submit_settings_update_local_window_size);
+munit_void_test_decl(test_nghttp2_submit_settings_multiple_times);
+munit_void_test_decl(test_nghttp2_submit_push_promise);
+munit_void_test_decl(test_nghttp2_submit_window_update);
+munit_void_test_decl(test_nghttp2_submit_window_update_local_window_size);
+munit_void_test_decl(test_nghttp2_submit_shutdown_notice);
+munit_void_test_decl(test_nghttp2_submit_invalid_nv);
+munit_void_test_decl(test_nghttp2_submit_extension);
+munit_void_test_decl(test_nghttp2_submit_altsvc);
+munit_void_test_decl(test_nghttp2_submit_origin);
+munit_void_test_decl(test_nghttp2_submit_priority_update);
+munit_void_test_decl(test_nghttp2_submit_rst_stream);
+munit_void_test_decl(test_nghttp2_session_open_stream);
+munit_void_test_decl(test_nghttp2_session_open_stream_with_idle_stream_dep);
+munit_void_test_decl(test_nghttp2_session_get_next_ob_item);
+munit_void_test_decl(test_nghttp2_session_pop_next_ob_item);
+munit_void_test_decl(test_nghttp2_session_reply_fail);
+munit_void_test_decl(test_nghttp2_session_max_concurrent_streams);
+munit_void_test_decl(test_nghttp2_session_stop_data_with_rst_stream);
+munit_void_test_decl(test_nghttp2_session_defer_data);
+munit_void_test_decl(test_nghttp2_session_flow_control);
+munit_void_test_decl(test_nghttp2_session_flow_control_data_recv);
+munit_void_test_decl(test_nghttp2_session_flow_control_data_with_padding_recv);
+munit_void_test_decl(test_nghttp2_session_data_read_temporal_failure);
+munit_void_test_decl(test_nghttp2_session_on_stream_close);
+munit_void_test_decl(test_nghttp2_session_on_ctrl_not_send);
+munit_void_test_decl(test_nghttp2_session_get_outbound_queue_size);
+munit_void_test_decl(test_nghttp2_session_get_effective_local_window_size);
+munit_void_test_decl(test_nghttp2_session_set_option);
+munit_void_test_decl(test_nghttp2_session_data_backoff_by_high_pri_frame);
+munit_void_test_decl(test_nghttp2_session_pack_data_with_padding);
+munit_void_test_decl(test_nghttp2_session_pack_headers_with_padding);
+munit_void_test_decl(test_nghttp2_pack_settings_payload);
+munit_void_test_decl(test_nghttp2_session_stream_dep_add);
+munit_void_test_decl(test_nghttp2_session_stream_dep_remove);
+munit_void_test_decl(test_nghttp2_session_stream_dep_add_subtree);
+munit_void_test_decl(test_nghttp2_session_stream_dep_remove_subtree);
+munit_void_test_decl(
+    test_nghttp2_session_stream_dep_all_your_stream_are_belong_to_us);
+munit_void_test_decl(test_nghttp2_session_stream_attach_item);
+munit_void_test_decl(test_nghttp2_session_stream_attach_item_subtree);
+munit_void_test_decl(test_nghttp2_session_stream_get_state);
+munit_void_test_decl(test_nghttp2_session_stream_get_something);
+munit_void_test_decl(test_nghttp2_session_find_stream);
+munit_void_test_decl(test_nghttp2_session_keep_closed_stream);
+munit_void_test_decl(test_nghttp2_session_keep_idle_stream);
+munit_void_test_decl(test_nghttp2_session_detach_idle_stream);
+munit_void_test_decl(test_nghttp2_session_large_dep_tree);
+munit_void_test_decl(test_nghttp2_session_graceful_shutdown);
+munit_void_test_decl(test_nghttp2_session_on_header_temporal_failure);
+munit_void_test_decl(test_nghttp2_session_recv_client_magic);
+munit_void_test_decl(test_nghttp2_session_delete_data_item);
+munit_void_test_decl(test_nghttp2_session_open_idle_stream);
+munit_void_test_decl(test_nghttp2_session_cancel_reserved_remote);
+munit_void_test_decl(test_nghttp2_session_reset_pending_headers);
+munit_void_test_decl(test_nghttp2_session_send_data_callback);
+munit_void_test_decl(test_nghttp2_session_on_begin_headers_temporal_failure);
+munit_void_test_decl(test_nghttp2_session_defer_then_close);
+munit_void_test_decl(test_nghttp2_session_detach_item_from_closed_stream);
+munit_void_test_decl(test_nghttp2_session_flooding);
+munit_void_test_decl(test_nghttp2_session_change_stream_priority);
+munit_void_test_decl(test_nghttp2_session_change_extpri_stream_priority);
+munit_void_test_decl(test_nghttp2_session_create_idle_stream);
+munit_void_test_decl(test_nghttp2_session_repeated_priority_change);
+munit_void_test_decl(test_nghttp2_session_repeated_priority_submission);
+munit_void_test_decl(test_nghttp2_session_set_local_window_size);
+munit_void_test_decl(test_nghttp2_session_cancel_from_before_frame_send);
+munit_void_test_decl(test_nghttp2_session_too_many_settings);
+munit_void_test_decl(test_nghttp2_session_removed_closed_stream);
+munit_void_test_decl(test_nghttp2_session_pause_data);
+munit_void_test_decl(test_nghttp2_session_no_closed_streams);
+munit_void_test_decl(test_nghttp2_session_set_stream_user_data);
+munit_void_test_decl(test_nghttp2_session_no_rfc7540_priorities);
+munit_void_test_decl(test_nghttp2_session_server_fallback_rfc7540_priorities);
+munit_void_test_decl(test_nghttp2_session_stream_reset_ratelim);
+munit_void_test_decl(test_nghttp2_http_mandatory_headers);
+munit_void_test_decl(test_nghttp2_http_content_length);
+munit_void_test_decl(test_nghttp2_http_content_length_mismatch);
+munit_void_test_decl(test_nghttp2_http_non_final_response);
+munit_void_test_decl(test_nghttp2_http_trailer_headers);
+munit_void_test_decl(test_nghttp2_http_ignore_regular_header);
+munit_void_test_decl(test_nghttp2_http_ignore_content_length);
+munit_void_test_decl(test_nghttp2_http_record_request_method);
+munit_void_test_decl(test_nghttp2_http_push_promise);
+munit_void_test_decl(test_nghttp2_http_head_method_upgrade_workaround);
+munit_void_test_decl(
+    test_nghttp2_http_no_rfc9113_leading_and_trailing_ws_validation);
 
 #endif /* NGHTTP2_SESSION_TEST_H */
diff --git a/tests/nghttp2_stream_test.c b/tests/nghttp2_stream_test.c
index 75b4d68..91be376 100644
--- a/tests/nghttp2_stream_test.c
+++ b/tests/nghttp2_stream_test.c
@@ -26,6 +26,4 @@
 
 #include <stdio.h>
 
-#include <CUnit/CUnit.h>
-
 #include "nghttp2_stream.h"
diff --git a/tests/nghttp2_test_helper.c b/tests/nghttp2_test_helper.c
index 1bd4a63..c1b912b 100644
--- a/tests/nghttp2_test_helper.c
+++ b/tests/nghttp2_test_helper.c
@@ -27,8 +27,6 @@
 #include <stdio.h>
 #include <assert.h>
 
-#include <CUnit/CUnit.h>
-
 #include "nghttp2_helper.h"
 #include "nghttp2_priority_spec.h"
 
@@ -155,9 +153,9 @@ void add_out(nva_out *out, nghttp2_nv *nv, nghttp2_mem *mem) {
   ++out->nvlen;
 }
 
-ssize_t inflate_hd(nghttp2_hd_inflater *inflater, nva_out *out,
-                   nghttp2_bufs *bufs, size_t offset, nghttp2_mem *mem) {
-  ssize_t rv;
+nghttp2_ssize inflate_hd(nghttp2_hd_inflater *inflater, nva_out *out,
+                         nghttp2_bufs *bufs, size_t offset, nghttp2_mem *mem) {
+  nghttp2_ssize rv;
   nghttp2_nv nv;
   int inflate_flags;
   nghttp2_buf_chain *ci;
@@ -183,7 +181,7 @@ ssize_t inflate_hd(nghttp2_hd_inflater *inflater, nva_out *out,
 
     for (;;) {
       inflate_flags = 0;
-      rv = nghttp2_hd_inflate_hd2(inflater, &nv, &inflate_flags, bp.pos,
+      rv = nghttp2_hd_inflate_hd3(inflater, &nv, &inflate_flags, bp.pos,
                                   nghttp2_buf_len(&bp), fin);
 
       if (rv < 0) {
@@ -210,7 +208,7 @@ ssize_t inflate_hd(nghttp2_hd_inflater *inflater, nva_out *out,
 
   nghttp2_hd_inflate_end_headers(inflater);
 
-  return (ssize_t)processed;
+  return (nghttp2_ssize)processed;
 }
 
 int pack_headers(nghttp2_bufs *bufs, nghttp2_hd_deflater *deflater,
diff --git a/tests/nghttp2_test_helper.h b/tests/nghttp2_test_helper.h
index c66298a..c0ed0b3 100644
--- a/tests/nghttp2_test_helper.h
+++ b/tests/nghttp2_test_helper.h
@@ -40,24 +40,6 @@
   }
 #define ARRLEN(ARR) (sizeof(ARR) / sizeof(ARR[0]))
 
-#define assert_nv_equal(A, B, len, mem)                                        \
-  do {                                                                         \
-    size_t alloclen = sizeof(nghttp2_nv) * len;                                \
-    const nghttp2_nv *sa = A, *sb = B;                                         \
-    nghttp2_nv *a = mem->malloc(alloclen, NULL);                               \
-    nghttp2_nv *b = mem->malloc(alloclen, NULL);                               \
-    ssize_t i_;                                                                \
-    memcpy(a, sa, alloclen);                                                   \
-    memcpy(b, sb, alloclen);                                                   \
-    nghttp2_nv_array_sort(a, len);                                             \
-    nghttp2_nv_array_sort(b, len);                                             \
-    for (i_ = 0; i_ < (ssize_t)len; ++i_) {                                    \
-      CU_ASSERT(nghttp2_nv_equal(&a[i_], &b[i_]));                             \
-    }                                                                          \
-    mem->free(b, NULL);                                                        \
-    mem->free(a, NULL);                                                        \
-  } while (0);
-
 int unpack_framebuf(nghttp2_frame *frame, nghttp2_bufs *bufs);
 
 int unpack_frame(nghttp2_frame *frame, const uint8_t *in, size_t len);
@@ -78,8 +60,8 @@ void nva_out_reset(nva_out *out, nghttp2_mem *mem);
 
 void add_out(nva_out *out, nghttp2_nv *nv, nghttp2_mem *mem);
 
-ssize_t inflate_hd(nghttp2_hd_inflater *inflater, nva_out *out,
-                   nghttp2_bufs *bufs, size_t offset, nghttp2_mem *mem);
+nghttp2_ssize inflate_hd(nghttp2_hd_inflater *inflater, nva_out *out,
+                         nghttp2_bufs *bufs, size_t offset, nghttp2_mem *mem);
 
 int pack_headers(nghttp2_bufs *bufs, nghttp2_hd_deflater *deflater,
                  int32_t stream_id, uint8_t flags, const nghttp2_nv *nva,