24 files changed, 9337 insertions, 0 deletions

diff --git a/src/lib/asiolink/tests/Makefile.am b/src/lib/asiolink/tests/Makefile.am
new file mode 100644
index 0000000..cad0d6d
--- /dev/null
+++ b/src/lib/asiolink/tests/Makefile.am
@@ -0,0 +1,75 @@
+AM_CPPFLAGS = -I$(top_srcdir)/src/lib -I$(top_builddir)/src/lib
+AM_CPPFLAGS += $(BOOST_INCLUDES) $(CRYPTO_CFLAGS) $(CRYPTO_INCLUDES)
+AM_CPPFLAGS += -DTEST_SCRIPT_SH=\"$(abs_top_builddir)/src/lib/asiolink/tests/process_spawn_app.sh\"
+AM_CPPFLAGS += -DINVALID_TEST_SCRIPT_SH=\"$(abs_top_srcdir)/README\"
+TEST_CA_DIR = $(abs_srcdir)/../testutils/ca
+AM_CPPFLAGS += -DTEST_CA_DIR=\"$(TEST_CA_DIR)\"
+
+AM_CXXFLAGS = $(KEA_CXXFLAGS)
+
+if USE_STATIC_LINK
+AM_LDFLAGS = -static
+endif
+
+CLEANFILES = *.gcno *.gcda test-socket
+
+DISTCLEANFILES = process_spawn_app.sh
+
+noinst_SCRIPTS = process_spawn_app.sh
+
+TESTS_ENVIRONMENT = $(LIBTOOL) --mode=execute $(VALGRIND_COMMAND)
+
+TESTS =
+if HAVE_GTEST
+TESTS += run_unittests
+run_unittests_SOURCES  = run_unittests.cc
+run_unittests_SOURCES += addr_utilities_unittest.cc
+run_unittests_SOURCES += io_address_unittest.cc
+run_unittests_SOURCES += hash_address_unittest.cc
+run_unittests_SOURCES += io_endpoint_unittest.cc
+run_unittests_SOURCES += io_socket_unittest.cc
+run_unittests_SOURCES += interval_timer_unittest.cc
+run_unittests_SOURCES += tcp_endpoint_unittest.cc
+run_unittests_SOURCES += tcp_socket_unittest.cc
+run_unittests_SOURCES += udp_endpoint_unittest.cc
+run_unittests_SOURCES += udp_socket_unittest.cc
+run_unittests_SOURCES += io_service_unittest.cc
+run_unittests_SOURCES += io_service_signal_unittests.cc
+run_unittests_SOURCES += io_service_thread_pool_unittests.cc
+run_unittests_SOURCES += dummy_io_callback_unittest.cc
+run_unittests_SOURCES += tcp_acceptor_unittest.cc
+run_unittests_SOURCES += unix_domain_socket_unittest.cc
+run_unittests_SOURCES += process_spawn_unittest.cc
+if HAVE_OPENSSL
+run_unittests_SOURCES += tls_unittest.cc
+run_unittests_SOURCES += tls_acceptor_unittest.cc
+run_unittests_SOURCES += tls_socket_unittest.cc
+endif
+if HAVE_BOTAN_BOOST
+run_unittests_SOURCES += tls_unittest.cc
+run_unittests_SOURCES += tls_acceptor_unittest.cc
+run_unittests_SOURCES += tls_socket_unittest.cc
+endif
+
+run_unittests_CPPFLAGS = $(AM_CPPFLAGS) $(GTEST_INCLUDES)
+
+run_unittests_LDADD  = $(top_builddir)/src/lib/asiolink/testutils/libasiolinktest.la
+run_unittests_LDADD += $(top_builddir)/src/lib/asiolink/libkea-asiolink.la
+run_unittests_LDADD += $(top_builddir)/src/lib/log/libkea-log.la
+run_unittests_LDADD += $(top_builddir)/src/lib/util/unittests/libutil_unittests.la
+run_unittests_LDADD += $(top_builddir)/src/lib/util/libkea-util.la
+run_unittests_LDADD += $(top_builddir)/src/lib/exceptions/libkea-exceptions.la
+run_unittests_LDADD += $(LOG4CPLUS_LIBS) $(BOOST_LIBS) $(CRYPTO_LIBS)
+run_unittests_LDADD += $(GTEST_LDADD)
+
+run_unittests_LDFLAGS = $(AM_LDFLAGS) $(CRYPTO_LDFLAGS) $(GTEST_LDFLAGS)
+
+# Note: the ordering matters: -Wno-... must follow -Wextra (defined in
+# KEA_CXXFLAGS)
+run_unittests_CXXFLAGS = $(AM_CXXFLAGS)
+if USE_GXX
+run_unittests_CXXFLAGS += -Wno-unused-parameter -Wno-unused-private-field
+endif
+endif
+
+noinst_PROGRAMS = $(TESTS)
diff --git a/src/lib/asiolink/tests/Makefile.in b/src/lib/asiolink/tests/Makefile.in
new file mode 100644
index 0000000..b76d283
--- /dev/null
+++ b/src/lib/asiolink/tests/Makefile.in
@@ -0,0 +1,1303 @@
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+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(DEPDIR)/run_unittests-addr_utilities_unittest.Po
+	-rm -f ./$(DEPDIR)/run_unittests-dummy_io_callback_unittest.Po
+	-rm -f ./$(DEPDIR)/run_unittests-hash_address_unittest.Po
+	-rm -f ./$(DEPDIR)/run_unittests-interval_timer_unittest.Po
+	-rm -f ./$(DEPDIR)/run_unittests-io_address_unittest.Po
+	-rm -f ./$(DEPDIR)/run_unittests-io_endpoint_unittest.Po
+	-rm -f ./$(DEPDIR)/run_unittests-io_service_signal_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-io_service_thread_pool_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-io_service_unittest.Po
+	-rm -f ./$(DEPDIR)/run_unittests-io_socket_unittest.Po
+	-rm -f ./$(DEPDIR)/run_unittests-process_spawn_unittest.Po
+	-rm -f ./$(DEPDIR)/run_unittests-run_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-tcp_acceptor_unittest.Po
+	-rm -f ./$(DEPDIR)/run_unittests-tcp_endpoint_unittest.Po
+	-rm -f ./$(DEPDIR)/run_unittests-tcp_socket_unittest.Po
+	-rm -f ./$(DEPDIR)/run_unittests-tls_acceptor_unittest.Po
+	-rm -f ./$(DEPDIR)/run_unittests-tls_socket_unittest.Po
+	-rm -f ./$(DEPDIR)/run_unittests-tls_unittest.Po
+	-rm -f ./$(DEPDIR)/run_unittests-udp_endpoint_unittest.Po
+	-rm -f ./$(DEPDIR)/run_unittests-udp_socket_unittest.Po
+	-rm -f ./$(DEPDIR)/run_unittests-unix_domain_socket_unittest.Po
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am:
+
+.MAKE: check-am install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-TESTS \
+	check-am clean clean-generic clean-libtool \
+	clean-noinstPROGRAMS cscopelist-am ctags ctags-am distclean \
+	distclean-compile distclean-generic distclean-libtool \
+	distclean-tags distdir dvi dvi-am html html-am info info-am \
+	install install-am install-data install-data-am install-dvi \
+	install-dvi-am install-exec install-exec-am install-html \
+	install-html-am install-info install-info-am install-man \
+	install-pdf install-pdf-am install-ps install-ps-am \
+	install-strip installcheck installcheck-am installdirs \
+	maintainer-clean maintainer-clean-generic mostlyclean \
+	mostlyclean-compile mostlyclean-generic mostlyclean-libtool \
+	pdf pdf-am ps ps-am tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/lib/asiolink/tests/addr_utilities_unittest.cc b/src/lib/asiolink/tests/addr_utilities_unittest.cc
new file mode 100644
index 0000000..30a9817
--- /dev/null
+++ b/src/lib/asiolink/tests/addr_utilities_unittest.cc
@@ -0,0 +1,388 @@
+// Copyright (C) 2012-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <asiolink/addr_utilities.h>
+#include <exceptions/exceptions.h>
+#include <util/bigints.h>
+
+#include <gtest/gtest.h>
+
+#include <vector>
+
+#include <stdint.h>
+#include <stdlib.h>
+
+using namespace std;
+using namespace isc::asiolink;
+using namespace isc::util;
+
+namespace {
+
+// This test verifies that lastAddrInPrefix is able to handle IPv4 operations.
+TEST(AddrUtilitiesTest, lastAddrInPrefix4) {
+    IOAddress addr1("192.0.2.1");
+
+    // Prefixes rounded to addresses are easy...
+    EXPECT_EQ("192.255.255.255", lastAddrInPrefix(addr1, 8).toText());
+    EXPECT_EQ("192.0.255.255",   lastAddrInPrefix(addr1, 16).toText());
+    EXPECT_EQ("192.0.2.255",     lastAddrInPrefix(addr1, 24).toText());
+
+    // these are trickier
+    EXPECT_EQ("192.0.2.127", lastAddrInPrefix(addr1, 25).toText());
+    EXPECT_EQ("192.0.2.63",  lastAddrInPrefix(addr1, 26).toText());
+    EXPECT_EQ("192.0.2.31",  lastAddrInPrefix(addr1, 27).toText());
+    EXPECT_EQ("192.0.2.15",  lastAddrInPrefix(addr1, 28).toText());
+    EXPECT_EQ("192.0.2.7",   lastAddrInPrefix(addr1, 29).toText());
+    EXPECT_EQ("192.0.2.3",   lastAddrInPrefix(addr1, 30).toText());
+
+    // that doesn't make much sense as /31 subnet consists of network address
+    // and a broadcast address, with 0 usable addresses.
+    EXPECT_EQ("192.0.2.1",   lastAddrInPrefix(addr1, 31).toText());
+    EXPECT_EQ("192.0.2.1",   lastAddrInPrefix(addr1, 32).toText());
+
+    // Let's check extreme cases
+    IOAddress anyAddr("0.0.0.0");
+    EXPECT_EQ("127.255.255.255", lastAddrInPrefix(anyAddr, 1).toText());
+    EXPECT_EQ("255.255.255.255", lastAddrInPrefix(anyAddr, 0).toText());
+    EXPECT_EQ("0.0.0.0", lastAddrInPrefix(anyAddr, 32).toText());
+}
+
+// This test checks if firstAddrInPrefix is able to handle IPv4 operations.
+TEST(AddrUtilitiesTest, firstAddrInPrefix4) {
+    IOAddress addr1("192.223.2.255");
+
+    // Prefixes rounded to addresses are easy...
+    EXPECT_EQ("192.0.0.0",   firstAddrInPrefix(addr1, 8).toText());
+    EXPECT_EQ("192.223.0.0", firstAddrInPrefix(addr1, 16).toText());
+    EXPECT_EQ("192.223.2.0", firstAddrInPrefix(addr1, 24).toText());
+
+    // these are trickier
+    EXPECT_EQ("192.223.2.128", firstAddrInPrefix(addr1, 25).toText());
+    EXPECT_EQ("192.223.2.192", firstAddrInPrefix(addr1, 26).toText());
+    EXPECT_EQ("192.223.2.224", firstAddrInPrefix(addr1, 27).toText());
+    EXPECT_EQ("192.223.2.240", firstAddrInPrefix(addr1, 28).toText());
+    EXPECT_EQ("192.223.2.248", firstAddrInPrefix(addr1, 29).toText());
+    EXPECT_EQ("192.223.2.252", firstAddrInPrefix(addr1, 30).toText());
+
+    // that doesn't make much sense as /31 subnet consists of network address
+    // and a broadcast address, with 0 usable addresses.
+    EXPECT_EQ("192.223.2.254", firstAddrInPrefix(addr1, 31).toText());
+    EXPECT_EQ("192.223.2.255", firstAddrInPrefix(addr1, 32).toText());
+
+    // Let's check extreme cases.
+    IOAddress bcast("255.255.255.255");
+    EXPECT_EQ("128.0.0.0", firstAddrInPrefix(bcast, 1).toText());
+    EXPECT_EQ("0.0.0.0", firstAddrInPrefix(bcast, 0).toText());
+    EXPECT_EQ("255.255.255.255", firstAddrInPrefix(bcast, 32).toText());
+
+}
+
+/// This test checks if lastAddrInPrefix properly supports IPv6 operations
+TEST(AddrUtilitiesTest, lastAddrInPrefix6) {
+    IOAddress addr1("2001:db8:1:1234:5678:abcd:1234:beef");
+
+    // Prefixes rounded to nibbles are easy...
+    EXPECT_EQ("2001:db8:1:1234:5678:abcd:1234:ffff",
+              lastAddrInPrefix(addr1, 112).toText());
+    EXPECT_EQ("2001:db8:1:1234:5678:abcd:123f:ffff",
+              lastAddrInPrefix(addr1, 108).toText());
+    EXPECT_EQ("2001:db8:1:1234:5678:abcd:12ff:ffff",
+              lastAddrInPrefix(addr1, 104).toText());
+    EXPECT_EQ("2001:db8:1:1234:ffff:ffff:ffff:ffff",
+              lastAddrInPrefix(addr1, 64).toText());
+
+    IOAddress addr2("2001::");
+
+    // These are trickier, though, as they are done in 1 bit increments
+
+    // the last address in 2001::/127 pool should be 2001::1
+    EXPECT_EQ("2001::1", lastAddrInPrefix(addr2, 127).toText());
+
+    EXPECT_EQ("2001::3", lastAddrInPrefix(addr2, 126).toText());
+    EXPECT_EQ("2001::7", lastAddrInPrefix(addr2, 125).toText());
+    EXPECT_EQ("2001::f", lastAddrInPrefix(addr2, 124).toText());
+    EXPECT_EQ("2001::1f", lastAddrInPrefix(addr2, 123).toText());
+    EXPECT_EQ("2001::3f", lastAddrInPrefix(addr2, 122).toText());
+    EXPECT_EQ("2001::7f", lastAddrInPrefix(addr2, 121).toText());
+    EXPECT_EQ("2001::ff", lastAddrInPrefix(addr2, 120).toText());
+
+    // Let's check extreme cases
+    IOAddress anyAddr("::");
+    EXPECT_EQ("7fff:ffff:ffff:ffff:ffff:ffff:ffff:ffff",
+              lastAddrInPrefix(anyAddr, 1).toText());
+    EXPECT_EQ("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff",
+              lastAddrInPrefix(anyAddr, 0).toText());
+    EXPECT_EQ("::", lastAddrInPrefix(anyAddr, 128).toText());
+}
+
+/// This test checks if firstAddrInPrefix properly supports IPv6 operations
+TEST(AddrUtilitiesTest, firstAddrInPrefix6) {
+    IOAddress addr1("2001:db8:1:1234:5678:1234:abcd:beef");
+
+    // Prefixes rounded to nibbles are easy...
+    EXPECT_EQ("2001:db8:1:1234:5678:1234::",
+              firstAddrInPrefix(addr1, 96).toText());
+    EXPECT_EQ("2001:db8:1:1234:5678:1230::",
+              firstAddrInPrefix(addr1, 92).toText());
+    EXPECT_EQ("2001:db8:1:1234:5678:1200::",
+              firstAddrInPrefix(addr1, 88).toText());
+    EXPECT_EQ("2001:db8:1:1234::",
+              firstAddrInPrefix(addr1, 64).toText());
+
+    IOAddress addr2("2001::ffff");
+
+    // These are trickier, though, as they are done in 1 bit increments
+
+    // the first address in 2001::/127 pool should be 2001::1
+    EXPECT_EQ("2001::fffe", firstAddrInPrefix(addr2, 127).toText());
+
+    EXPECT_EQ("2001::fffc", firstAddrInPrefix(addr2, 126).toText());
+    EXPECT_EQ("2001::fff8", firstAddrInPrefix(addr2, 125).toText());
+    EXPECT_EQ("2001::fff0", firstAddrInPrefix(addr2, 124).toText());
+    EXPECT_EQ("2001::ffe0", firstAddrInPrefix(addr2, 123).toText());
+    EXPECT_EQ("2001::ffc0", firstAddrInPrefix(addr2, 122).toText());
+    EXPECT_EQ("2001::ff80", firstAddrInPrefix(addr2, 121).toText());
+    EXPECT_EQ("2001::ff00", firstAddrInPrefix(addr2, 120).toText());
+}
+
+// Checks if IPv4 netmask is generated properly
+TEST(AddrUtilitiesTest, getNetmask4) {
+    EXPECT_EQ("0.0.0.0", getNetmask4(0).toText());
+    EXPECT_EQ("128.0.0.0", getNetmask4(1).toText());
+    EXPECT_EQ("192.0.0.0", getNetmask4(2).toText());
+    EXPECT_EQ("224.0.0.0", getNetmask4(3).toText());
+    EXPECT_EQ("240.0.0.0", getNetmask4(4).toText());
+    EXPECT_EQ("248.0.0.0", getNetmask4(5).toText());
+    EXPECT_EQ("252.0.0.0", getNetmask4(6).toText());
+    EXPECT_EQ("254.0.0.0", getNetmask4(7).toText());
+    EXPECT_EQ("255.0.0.0", getNetmask4(8).toText());
+
+    EXPECT_EQ("255.128.0.0", getNetmask4(9).toText());
+    EXPECT_EQ("255.192.0.0", getNetmask4(10).toText());
+    EXPECT_EQ("255.224.0.0", getNetmask4(11).toText());
+    EXPECT_EQ("255.240.0.0", getNetmask4(12).toText());
+    EXPECT_EQ("255.248.0.0", getNetmask4(13).toText());
+    EXPECT_EQ("255.252.0.0", getNetmask4(14).toText());
+    EXPECT_EQ("255.254.0.0", getNetmask4(15).toText());
+    EXPECT_EQ("255.255.0.0", getNetmask4(16).toText());
+
+    EXPECT_EQ("255.255.128.0", getNetmask4(17).toText());
+    EXPECT_EQ("255.255.192.0", getNetmask4(18).toText());
+    EXPECT_EQ("255.255.224.0", getNetmask4(19).toText());
+    EXPECT_EQ("255.255.240.0", getNetmask4(20).toText());
+    EXPECT_EQ("255.255.248.0", getNetmask4(21).toText());
+    EXPECT_EQ("255.255.252.0", getNetmask4(22).toText());
+    EXPECT_EQ("255.255.254.0", getNetmask4(23).toText());
+    EXPECT_EQ("255.255.255.0", getNetmask4(24).toText());
+
+    EXPECT_EQ("255.255.255.128", getNetmask4(25).toText());
+    EXPECT_EQ("255.255.255.192", getNetmask4(26).toText());
+    EXPECT_EQ("255.255.255.224", getNetmask4(27).toText());
+    EXPECT_EQ("255.255.255.240", getNetmask4(28).toText());
+    EXPECT_EQ("255.255.255.248", getNetmask4(29).toText());
+    EXPECT_EQ("255.255.255.252", getNetmask4(30).toText());
+    EXPECT_EQ("255.255.255.254", getNetmask4(31).toText());
+    EXPECT_EQ("255.255.255.255", getNetmask4(32).toText());
+
+    EXPECT_THROW(getNetmask4(33), isc::BadValue);
+}
+
+// Checks if the calculation for IPv4 addresses in range are correct.
+TEST(AddrUtilitiesTest, addrsInRange4) {
+
+    // Let's start with something simple
+    EXPECT_EQ(1, addrsInRange(IOAddress("192.0.2.0"), IOAddress("192.0.2.0")));
+    EXPECT_EQ(10, addrsInRange(IOAddress("192.0.2.10"), IOAddress("192.0.2.19")));
+    EXPECT_EQ(256, addrsInRange(IOAddress("192.0.2.0"), IOAddress("192.0.2.255")));
+    EXPECT_EQ(65536, addrsInRange(IOAddress("192.0.0.0"), IOAddress("192.0.255.255")));
+    EXPECT_EQ(16777216, addrsInRange(IOAddress("10.0.0.0"), IOAddress("10.255.255.255")));
+
+    // Let's check if the network boundaries are crossed correctly.
+    EXPECT_EQ(3, addrsInRange(IOAddress("10.0.0.255"), IOAddress("10.0.1.1")));
+
+    // Let's go a bit overboard with this! How many addresses are there in
+    // IPv4 address space? That's a slightly tricky question, as the answer
+    // cannot be stored in uint32_t.
+    EXPECT_EQ(uint64_t(std::numeric_limits<uint32_t>::max()) + 1,
+              addrsInRange(IOAddress("0.0.0.0"), IOAddress("255.255.255.255")));
+
+    // The upper bound cannot be smaller than the lower bound.
+    EXPECT_THROW(addrsInRange(IOAddress("192.0.2.5"), IOAddress("192.0.2.4")),
+                 isc::BadValue);
+}
+
+// Checks if the calculation for IPv6 addresses in range are correct.
+TEST(AddrUtilitiesTest, addrsInRange6) {
+
+    // Let's start with something simple
+    EXPECT_EQ(1, addrsInRange(IOAddress("::"), IOAddress("::")));
+    EXPECT_EQ(16, addrsInRange(IOAddress("fe80::1"), IOAddress("fe80::10")));
+    EXPECT_EQ(65536, addrsInRange(IOAddress("fe80::"), IOAddress("fe80::ffff")));
+    EXPECT_EQ(uint64_t(std::numeric_limits<uint32_t>::max()) + 1,
+              addrsInRange(IOAddress("fe80::"), IOAddress("fe80::ffff:ffff")));
+
+    // There's 2^80 addresses between those. Due to uint64_t limits, this method is
+    // capped at 2^64 -1.
+    EXPECT_EQ(std::numeric_limits<uint64_t>::max(),
+              addrsInRange(IOAddress("2001:db8:1::"), IOAddress("2001:db8:2::")));
+
+    // Let's check if the network boundaries are crossed correctly.
+    EXPECT_EQ(3, addrsInRange(IOAddress("2001:db8::ffff"), IOAddress("2001:db8::1:1")));
+
+    // Let's go a bit overboard with this! How many addresses are there in
+    // IPv6 address space? That's a really tricky question, as the answer
+    // wouldn't fit even in uint128_t (if we had it). This method is capped
+    // at max value of uint64_t.
+    EXPECT_EQ(std::numeric_limits<uint64_t>::max(), addrsInRange(IOAddress("::"),
+              IOAddress("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff")));
+
+    EXPECT_THROW(addrsInRange(IOAddress("fe80::5"), IOAddress("fe80::4")),
+                 isc::BadValue);
+}
+
+// Checks if IPv4 address ranges can be converted to prefix / prefix_len
+TEST(AddrUtilitiesTest, prefixLengthFromRange4) {
+    // Use a shorter name
+    const auto& plfr = prefixLengthFromRange;
+
+    // Let's start with something simple
+    EXPECT_EQ(32, plfr(IOAddress("192.0.2.0"), IOAddress("192.0.2.0")));
+    EXPECT_EQ(31, plfr(IOAddress("192.0.2.0"), IOAddress("192.0.2.1")));
+    EXPECT_EQ(30, plfr(IOAddress("192.0.2.0"), IOAddress("192.0.2.3")));
+    EXPECT_EQ(29, plfr(IOAddress("192.0.2.0"), IOAddress("192.0.2.7")));
+    EXPECT_EQ(28, plfr(IOAddress("192.0.2.0"), IOAddress("192.0.2.15")));
+    EXPECT_EQ(27, plfr(IOAddress("192.0.2.0"), IOAddress("192.0.2.31")));
+    EXPECT_EQ(26, plfr(IOAddress("192.0.2.0"), IOAddress("192.0.2.63")));
+    EXPECT_EQ(25, plfr(IOAddress("192.0.2.0"), IOAddress("192.0.2.127")));
+    EXPECT_EQ(24, plfr(IOAddress("192.0.2.0"), IOAddress("192.0.2.255")));
+    EXPECT_EQ(23, plfr(IOAddress("192.0.2.0"), IOAddress("192.0.3.255")));
+    EXPECT_EQ(16, plfr(IOAddress("10.0.0.0"), IOAddress("10.0.255.255")));
+    EXPECT_EQ(8, plfr(IOAddress("10.0.0.0"), IOAddress("10.255.255.255")));
+    EXPECT_EQ(0, plfr(IOAddress("0.0.0.0"), IOAddress("255.255.255.255")));
+
+    // Fail if a network boundary is crossed
+    EXPECT_EQ(-1, plfr(IOAddress("10.0.0.255"), IOAddress("10.0.1.1")));
+
+    // Fail if first is not at the begin
+    EXPECT_EQ(-1, plfr(IOAddress("10.0.0.2"), IOAddress("10.0.0.5")));
+
+    // The upper bound cannot be smaller than the lower bound
+    EXPECT_THROW(plfr(IOAddress("192.0.2.5"), IOAddress("192.0.2.4")),
+                 isc::BadValue);
+}
+
+// Checks if IPv6 address ranges can be converted to prefix / prefix_len
+TEST(AddrUtilitiesTest, prefixLengthFromRange6) {
+    // Use a shorter name
+    const auto& plfr = prefixLengthFromRange;
+
+    // Let's start with something simple
+    EXPECT_EQ(128, plfr(IOAddress("::"), IOAddress("::")));
+    EXPECT_EQ(112, plfr(IOAddress("fe80::"),  IOAddress("fe80::ffff")));
+    EXPECT_EQ(96, plfr(IOAddress("fe80::"),  IOAddress("fe80::ffff:ffff")));
+    EXPECT_EQ(80, plfr(IOAddress("fe80::"),
+                       IOAddress("fe80::ffff:ffff:ffff")));
+    EXPECT_EQ(64, plfr(IOAddress("fe80::"),
+                       IOAddress("fe80::ffff:ffff:ffff:ffff")));
+    EXPECT_EQ(63, plfr(IOAddress("fe80::"),
+                       IOAddress("fe80::1:ffff:ffff:ffff:ffff")));
+    EXPECT_EQ(62, plfr(IOAddress("fe80::"),
+                       IOAddress("fe80::3:ffff:ffff:ffff:ffff")));
+    EXPECT_EQ(61, plfr(IOAddress("fe80::"),
+                       IOAddress("fe80::7:ffff:ffff:ffff:ffff")));
+    EXPECT_EQ(60, plfr(IOAddress("fe80::"),
+                       IOAddress("fe80::f:ffff:ffff:ffff:ffff")));
+    EXPECT_EQ(59, plfr(IOAddress("fe80::"),
+                       IOAddress("fe80::1f:ffff:ffff:ffff:ffff")));
+    EXPECT_EQ(58, plfr(IOAddress("fe80::"),
+                       IOAddress("fe80::3f:ffff:ffff:ffff:ffff")));
+    EXPECT_EQ(57, plfr(IOAddress("fe80::"),
+                       IOAddress("fe80::7f:ffff:ffff:ffff:ffff")));
+    EXPECT_EQ(56, plfr(IOAddress("fe80::"),
+                       IOAddress("fe80::ff:ffff:ffff:ffff:ffff")));
+    EXPECT_EQ(55, plfr(IOAddress("fe80::"),
+                       IOAddress("fe80::1ff:ffff:ffff:ffff:ffff")));
+    EXPECT_EQ(54, plfr(IOAddress("fe80::"),
+                       IOAddress("fe80::3ff:ffff:ffff:ffff:ffff")));
+    EXPECT_EQ(53, plfr(IOAddress("fe80::"),
+                       IOAddress("fe80::7ff:ffff:ffff:ffff:ffff")));
+    EXPECT_EQ(52, plfr(IOAddress("fe80::"),
+                       IOAddress("fe80::fff:ffff:ffff:ffff:ffff")));
+    EXPECT_EQ(51, plfr(IOAddress("fe80::"),
+                       IOAddress("fe80::1fff:ffff:ffff:ffff:ffff")));
+    EXPECT_EQ(50, plfr(IOAddress("fe80::"),
+                       IOAddress("fe80::3fff:ffff:ffff:ffff:ffff")));
+    EXPECT_EQ(49, plfr(IOAddress("fe80::"),
+                       IOAddress("fe80::7fff:ffff:ffff:ffff:ffff")));
+    EXPECT_EQ(48, plfr(IOAddress("fe80::"),
+                       IOAddress("fe80::ffff:ffff:ffff:ffff:ffff")));
+    EXPECT_EQ(0, plfr(IOAddress("::"),
+                      IOAddress("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff")));
+
+    // Fail if a network boundary is crossed
+    EXPECT_EQ(-1, plfr(IOAddress("2001:db8::ffff"),
+                       IOAddress("2001:db8::1:1")));
+
+    // Fail if first is not at the begin
+    EXPECT_EQ(-1, plfr(IOAddress("2001:db8::2"), IOAddress("2001:db8::5")));
+    EXPECT_EQ(-1, plfr(IOAddress("2001:db8::2:0"),
+                       IOAddress("2001:db8::5:ffff")));
+    EXPECT_EQ(-1, plfr(IOAddress("2001:db8::2:ff00:0"),
+                       IOAddress("2001:db8::3:00ff:ffff")));
+
+    // The upper bound cannot be smaller than the lower bound
+    EXPECT_THROW(plfr(IOAddress("fe80::5"), IOAddress("fe80::4")),
+                 isc::BadValue);
+
+    // Address family must match
+    EXPECT_THROW(plfr(IOAddress("192.0.2.0"), IOAddress("fe80::1")),
+                 isc::BadValue);
+}
+
+// Checks if prefixInRange returns valid number of prefixes in specified range.
+TEST(AddrUtilitiesTest, prefixesInRange) {
+
+    // How many /64 prefixes are in /64 pool?
+    EXPECT_EQ(1, prefixesInRange(64, 64));
+
+    // How many /63 prefixes are in /64 pool?
+    EXPECT_EQ(2, prefixesInRange(63, 64));
+
+    // How many /64 prefixes are in /48 pool?
+    EXPECT_EQ(65536, prefixesInRange(48, 64));
+
+    // How many /127 prefixes are in /64 pool?
+    EXPECT_EQ(uint64_t(9223372036854775808ull), prefixesInRange(64, 127));
+
+    // How many /128 prefixes are in /64 pool?
+    EXPECT_EQ(uint128_t(1) << 64, prefixesInRange(64, 128));
+
+    // Let's go overboard again. How many IPv6 addresses are there?
+    EXPECT_EQ(uint128_t(1) << 127, prefixesInRange(1, 128));
+
+    // Let's go overboard again. How many IPv6 addresses are there?
+    EXPECT_EQ(uint128_t(-1), prefixesInRange(0, 128));
+}
+
+// Checks the function which finds an IPv4 address from input address and offset.
+TEST(AddrUtilitiesTest, offsetIPv4Address) {
+    EXPECT_EQ("10.1.2.46", offsetAddress(IOAddress("10.1.1.45"), 257).toText());
+    EXPECT_EQ("10.1.7.9", offsetAddress(IOAddress("10.1.1.45"), 1500).toText());
+    // Using very large offset. The maximum IPv4 address should be returned.
+    EXPECT_EQ("255.255.255.255", offsetAddress(IOAddress("255.255.254.254"), 0xFFFFFFFFFFFFFFFA).toText());
+}
+
+// Checks the function which finds an IPv6 address from input address and offset.
+TEST(AddrUtilitiesTest, offsetIPv6Address) {
+    EXPECT_EQ("2001:db8:1::4", offsetAddress(IOAddress("2001:db8:1::4"), 0).toText());
+    EXPECT_EQ("2001:db8:1::10:3", offsetAddress(IOAddress("2001:db8:1::4"), 0xFFFFF).toText());
+    EXPECT_EQ("2001:db8:2::", offsetAddress(IOAddress("2001:db8:1:FFFF::1"), 0xFFFFFFFFFFFFFFFF).toText());
+    EXPECT_EQ("3000::1c", offsetAddress(IOAddress("3000::15"), 7).toText());
+}
+
+} // end of anonymous namespace
diff --git a/src/lib/asiolink/tests/dummy_io_callback_unittest.cc b/src/lib/asiolink/tests/dummy_io_callback_unittest.cc
new file mode 100644
index 0000000..b836893
--- /dev/null
+++ b/src/lib/asiolink/tests/dummy_io_callback_unittest.cc
@@ -0,0 +1,27 @@
+// Copyright (C) 2014-2016 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <asiolink/asio_wrapper.h>
+#include <asiolink/dummy_io_cb.h>
+
+#include <gtest/gtest.h>
+
+using namespace isc::asiolink;
+using namespace boost::asio;
+
+namespace { // begin unnamed namespace
+
+TEST(DummyIOCallbackTest, throws) {
+    DummyIOCallback cb;
+    boost::system::error_code error_code;
+
+    // All methods should throw isc::Unexpected.
+    EXPECT_THROW(cb(error_code), isc::Unexpected);
+    EXPECT_THROW(cb(error_code, 42), isc::Unexpected);
+}
+
+} // end of unnamed namespace
diff --git a/src/lib/asiolink/tests/hash_address_unittest.cc b/src/lib/asiolink/tests/hash_address_unittest.cc
new file mode 100644
index 0000000..50fa43f
--- /dev/null
+++ b/src/lib/asiolink/tests/hash_address_unittest.cc
@@ -0,0 +1,58 @@
+// Copyright (C) 2020 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <asiolink/io_address.h>
+#include <gtest/gtest.h>
+#include <boost/functional/hash.hpp>
+#include <string>
+#include <unordered_map>
+#include <unordered_set>
+
+// In fact the goal i.e. is to check if the file compiles.
+
+using namespace isc::asiolink;
+
+typedef boost::hash<IOAddress> hash_address;
+
+TEST(HashAddressTest, unorderedSet) {
+    std::unordered_set<IOAddress, hash_address> set;
+    EXPECT_TRUE(set.empty());
+    EXPECT_EQ(0, set.size());
+
+    IOAddress addr("192.168.2.1");
+    EXPECT_EQ(set.end(), set.find(addr));
+    EXPECT_EQ(0, set.count(addr));
+
+    EXPECT_NO_THROW(set.insert(addr));
+    EXPECT_FALSE(set.empty());
+    EXPECT_EQ(1, set.size());
+    EXPECT_NE(set.end(), set.find(addr));
+    EXPECT_EQ(1, set.count(addr));
+
+    EXPECT_NO_THROW(set.clear());
+    EXPECT_TRUE(set.empty());
+}
+
+TEST(HashAddressTest, unorderedMap) {
+    std::unordered_map<IOAddress, std::string, hash_address> map;
+    EXPECT_TRUE(map.empty());
+    EXPECT_EQ(0, map.size());
+
+    IOAddress addr("192.168.2.1");
+    EXPECT_EQ(map.end(), map.find(addr));
+    EXPECT_EQ(0, map.count(addr));
+
+    std::string str("my-address");
+    EXPECT_NO_THROW(map[addr] = str);
+    EXPECT_FALSE(map.empty());
+    EXPECT_EQ(1, map.size());
+    EXPECT_NE(map.end(), map.find(addr));
+    EXPECT_EQ(1, map.count(addr));
+
+    EXPECT_NO_THROW(map.clear());
+    EXPECT_TRUE(map.empty());
+}
diff --git a/src/lib/asiolink/tests/interval_timer_unittest.cc b/src/lib/asiolink/tests/interval_timer_unittest.cc
new file mode 100644
index 0000000..757bba4
--- /dev/null
+++ b/src/lib/asiolink/tests/interval_timer_unittest.cc
@@ -0,0 +1,377 @@
+// Copyright (C) 2011-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <asiolink/asio_wrapper.h>
+#include <asiolink/asiolink.h>
+
+#include <boost/date_time/posix_time/posix_time.hpp>
+#include <gtest/gtest.h>
+
+namespace {
+// TODO: Consider this margin
+const boost::posix_time::time_duration TIMER_MARGIN_MSEC =
+    boost::posix_time::milliseconds(50);
+}
+
+using namespace isc::asiolink;
+
+// This fixture is for testing IntervalTimer. Some callback functors are
+// registered as callback function of the timer to test if they are called
+// or not.
+class IntervalTimerTest : public ::testing::Test {
+protected:
+    IntervalTimerTest() :
+        io_service_(), timer_called_(false), timer_cancel_success_(false)
+    {}
+    ~IntervalTimerTest() {}
+    class TimerCallBack {
+    public:
+        TimerCallBack(IntervalTimerTest* test_obj) : test_obj_(test_obj) {}
+        void operator()() const {
+            test_obj_->timer_called_ = true;
+            test_obj_->io_service_.stop();
+            return;
+        }
+    private:
+        IntervalTimerTest* test_obj_;
+    };
+    class TimerCallBackCounter {
+    public:
+        TimerCallBackCounter(IntervalTimerTest* test_obj) :
+            test_obj_(test_obj)
+        {
+            counter_ = 0;
+        }
+        void operator()() {
+            ++counter_;
+            return;
+        }
+        int counter_;
+    private:
+        IntervalTimerTest* test_obj_;
+    };
+    class TimerCallBackCancelDeleter {
+    public:
+        TimerCallBackCancelDeleter(IntervalTimerTest* test_obj,
+                                   IntervalTimer* timer,
+                                   TimerCallBackCounter& counter)
+            : test_obj_(test_obj), timer_(timer), counter_(counter), count_(0),
+              prev_counter_(-1)
+        {}
+        void operator()() {
+            ++count_;
+            if (count_ == 1) {
+                // First time of call back.
+                // Store the value of counter_.counter_.
+                prev_counter_ = counter_.counter_;
+                delete timer_;
+            } else if (count_ == 2) {
+                // Second time of call back.
+                // Stop io_service to stop all timers.
+                test_obj_->io_service_.stop();
+                // Compare the value of counter_.counter_ with stored one.
+                // If TimerCallBackCounter was not called (expected behavior),
+                // they are same.
+                if (counter_.counter_ == prev_counter_) {
+                    test_obj_->timer_cancel_success_ = true;
+                }
+            }
+            return;
+        }
+    private:
+        IntervalTimerTest* test_obj_;
+        IntervalTimer* timer_;
+        TimerCallBackCounter& counter_;
+        int count_;
+        int prev_counter_;
+    };
+    class TimerCallBackCanceller {
+    public:
+        TimerCallBackCanceller(unsigned int& counter, IntervalTimer& itimer) :
+            counter_(counter), itimer_(itimer)
+        {}
+        void operator()() {
+            ++counter_;
+            itimer_.cancel();
+        }
+    private:
+        unsigned int& counter_;
+        IntervalTimer& itimer_;
+    };
+    class TimerCallBackOverwriter {
+    public:
+        TimerCallBackOverwriter(IntervalTimerTest* test_obj,
+                                IntervalTimer& timer)
+            : test_obj_(test_obj), timer_(timer), count_(0)
+        {}
+        void operator()() {
+            ++count_;
+            if (count_ == 1) {
+                // First time of call back.
+                // Call setup() to update callback function to TimerCallBack.
+                test_obj_->timer_called_ = false;
+                timer_.setup(TimerCallBack(test_obj_), 100);
+            } else if (count_ == 2) {
+                // Second time of call back.
+                // If it reaches here, re-setup() is failed (unexpected).
+                // We should stop here.
+                test_obj_->io_service_.stop();
+            }
+            return;
+        }
+    private:
+        IntervalTimerTest* test_obj_;
+        IntervalTimer& timer_;
+        int count_;
+    };
+    class TimerCallBackAccumulator {
+    public:
+        TimerCallBackAccumulator(IntervalTimerTest* test_obj, int &counter) :
+            test_obj_(test_obj), counter_(counter) {
+        }
+        void operator()() {
+            ++counter_;
+            return;
+        }
+    private:
+        IntervalTimerTest* test_obj_;
+        // Reference to integer accumulator
+        int& counter_;
+    };
+protected:
+    IOService io_service_;
+    bool timer_called_;
+    bool timer_cancel_success_;
+};
+
+TEST_F(IntervalTimerTest, invalidArgumentToIntervalTimer) {
+    // Create asio_link::IntervalTimer and setup.
+    IntervalTimer itimer(io_service_);
+    // expect throw if call back function is empty
+    EXPECT_THROW(itimer.setup(IntervalTimer::Callback(), 1),
+                 isc::InvalidParameter);
+    // expect throw if interval is negative.
+    EXPECT_THROW(itimer.setup(TimerCallBack(this), -1), isc::BadValue);
+}
+
+TEST_F(IntervalTimerTest, startIntervalTimer) {
+    // Create asio_link::IntervalTimer and setup.
+    // Then run IOService and test if the callback function is called.
+    IntervalTimer itimer(io_service_);
+    timer_called_ = false;
+    // store start time
+    boost::posix_time::ptime start;
+    start = boost::posix_time::microsec_clock::universal_time();
+    // setup timer
+    itimer.setup(TimerCallBack(this), 100);
+    EXPECT_EQ(100, itimer.getInterval());
+    io_service_.run();
+    // Control reaches here after io_service_ was stopped by TimerCallBack.
+
+    // delta: difference between elapsed time and 100 milliseconds.
+    boost::posix_time::time_duration test_runtime =
+        boost::posix_time::microsec_clock::universal_time() - start;
+    EXPECT_FALSE(test_runtime.is_negative()) <<
+                 "test duration " << test_runtime <<
+                 " negative - clock skew?";
+    // Expect TimerCallBack is called; timer_called_ is true
+    EXPECT_TRUE(timer_called_);
+    // Expect test_runtime is 100 milliseconds or longer.
+    // Allow 1% of clock skew
+    EXPECT_TRUE(test_runtime >= boost::posix_time::milliseconds(99)) <<
+                "test runtime " << test_runtime.total_milliseconds() <<
+                "msec >= 100";
+}
+
+TEST_F(IntervalTimerTest, destructIntervalTimer) {
+    // This code isn't exception safe, but we'd rather keep the code
+    // simpler and more readable as this is only for tests and if it throws
+    // the program would immediately terminate anyway.
+
+    // The call back function will not be called after the timer is
+    // destroyed.
+    //
+    // There are two timers:
+    //  itimer_counter (A)
+    //   (Calls TimerCallBackCounter)
+    //     - increments internal counter in callback function
+    //  itimer_canceller (B)
+    //   (Calls TimerCallBackCancelDeleter)
+    //     - first time of callback, it stores the counter value of
+    //       callback_canceller and destroys itimer_counter
+    //     - second time of callback, it compares the counter value of
+    //       callback_canceller with stored value
+    //       if they are same the timer was not called; expected result
+    //       if they are different the timer was called after destroyed
+    //
+    //     0  100  200  300  400  500  600 (ms)
+    // (A) i--------+----x
+    //                   ^
+    //                   |destroy itimer_counter
+    // (B) i-------------+--------------s
+    //                                  ^stop io_service
+    //                                   and check if itimer_counter have been
+    //                                   stopped
+
+    // itimer_counter will be deleted in TimerCallBackCancelDeleter
+    IntervalTimer* itimer_counter = new IntervalTimer(io_service_);
+    IntervalTimer itimer_canceller(io_service_);
+    timer_cancel_success_ = false;
+    TimerCallBackCounter callback_canceller(this);
+    itimer_counter->setup(callback_canceller, 200);
+    itimer_canceller.setup(
+        TimerCallBackCancelDeleter(this, itimer_counter, callback_canceller),
+        300);
+    io_service_.run();
+    EXPECT_TRUE(timer_cancel_success_);
+}
+
+TEST_F(IntervalTimerTest, cancel) {
+    // Similar to destructIntervalTimer test, but the first timer explicitly
+    // cancels itself on first callback.
+    IntervalTimer itimer_counter(io_service_);
+    IntervalTimer itimer_watcher(io_service_);
+    unsigned int counter = 0;
+    itimer_counter.setup(TimerCallBackCanceller(counter, itimer_counter), 100);
+    itimer_watcher.setup(TimerCallBack(this), 200);
+    io_service_.run();
+    EXPECT_EQ(1, counter);
+    EXPECT_EQ(0, itimer_counter.getInterval());
+
+    // canceling an already canceled timer shouldn't cause any surprise.
+    EXPECT_NO_THROW(itimer_counter.cancel());
+}
+
+TEST_F(IntervalTimerTest, overwriteIntervalTimer) {
+    // Call setup() multiple times to update call back function and interval.
+    //
+    // There are two timers:
+    //  itimer (A)
+    //   (Calls TimerCallBackCounter / TimerCallBack)
+    //     - increments internal counter in callback function
+    //       (TimerCallBackCounter)
+    //       interval: 300 milliseconds
+    //     - io_service_.stop() (TimerCallBack)
+    //       interval: 100 milliseconds
+    //  itimer_overwriter (B)
+    //   (Calls TimerCallBackOverwriter)
+    //     - first time of callback, it calls setup() to change call back
+    //       function to TimerCallBack and interval of itimer to 100
+    //       milliseconds
+    //       after 300 + 100 milliseconds from the beginning of this test,
+    //       TimerCallBack() will be called and io_service_ stops.
+    //     - second time of callback, it means the test fails.
+    //
+    //     0  100  200  300  400  500  600  700  800 (ms)
+    // (A) i-------------+----C----s
+    //                        ^    ^stop io_service
+    //                        |change call back function and interval
+    // (B) i------------------+-------------------S
+    //                                            ^(stop io_service on fail)
+    //
+
+    IntervalTimer itimer(io_service_);
+    IntervalTimer itimer_overwriter(io_service_);
+    // store start time
+    boost::posix_time::ptime start;
+    start = boost::posix_time::microsec_clock::universal_time();
+    itimer.setup(TimerCallBackCounter(this), 300);
+    itimer_overwriter.setup(TimerCallBackOverwriter(this, itimer), 400);
+    io_service_.run();
+    // Control reaches here after io_service_ was stopped by
+    // TimerCallBackCounter or TimerCallBackOverwriter.
+
+    // Expect callback function is updated: TimerCallBack is called
+    EXPECT_TRUE(timer_called_);
+    // Expect interval is updated: return value of getInterval() is updated
+    EXPECT_EQ(itimer.getInterval(), 100);
+}
+
+// This test verifies that timers operate correctly based on their mode.
+TEST_F(IntervalTimerTest, intervalModeTest) {
+    // Create a timer to control the duration of the test.
+    IntervalTimer test_timer(io_service_);
+    test_timer.setup(TimerCallBack(this), 2000);
+
+    // Create an timer which automatically reschedules itself.  Use the
+    // accumulator callback to increment local counter for it.
+    int repeater_count = 0;
+    IntervalTimer repeater(io_service_);
+    repeater.setup(TimerCallBackAccumulator(this, repeater_count), 10);
+
+    // Create a one-shot timer. Use the accumulator callback to increment
+    // local counter variable for it.
+    int one_shot_count = 0;
+    IntervalTimer one_shot(io_service_);
+    one_shot.setup(TimerCallBackAccumulator(this, one_shot_count), 10,
+                   IntervalTimer::ONE_SHOT);
+
+    // As long as service runs at least one event handler, loop until
+    // we've hit our goals.  It won't return zero unless is out of
+    // work or the service has been stopped by the test timer.
+    int cnt = 0;
+    while (((cnt = io_service_.get_io_service().run_one()) > 0)
+           && (repeater_count < 5)) {
+        // deliberately empty
+    };
+
+    // If cnt is zero, then something went wrong.
+    EXPECT_TRUE(cnt > 0);
+
+    // The loop stopped make sure it was for the right reason.
+    EXPECT_EQ(repeater_count, 5);
+    EXPECT_EQ(one_shot_count, 1);
+}
+
+// This test verifies that the same timer can be reused in either mode.
+TEST_F(IntervalTimerTest, timerReuseTest) {
+    // Create a timer to control the duration of the test.
+    IntervalTimer test_timer(io_service_);
+    test_timer.setup(TimerCallBack(this), 2000);
+
+    // Create a one-shot timer. Use the accumulator callback to increment
+    // local counter variable for it.
+    int one_shot_count = 0;
+    IntervalTimer one_shot(io_service_);
+    TimerCallBackAccumulator callback(this, one_shot_count);
+    one_shot.setup(callback, 10, IntervalTimer::ONE_SHOT);
+
+    // Run until a single event handler executes.  This should be our
+    // one-shot expiring.
+    io_service_.run_one();
+
+    // Verify the timer expired once.
+    ASSERT_EQ(one_shot_count, 1);
+
+    // Setup the one-shot to go again.
+    one_shot.setup(callback, 10, IntervalTimer::ONE_SHOT);
+
+    // Run until a single event handler executes.  This should be our
+    // one-shot expiring.
+    io_service_.run_one();
+
+    // Verify the timer expired once.
+    ASSERT_EQ(one_shot_count, 2);
+
+    // Setup the timer to be repeating.
+    one_shot.setup(callback, 10, IntervalTimer::REPEATING);
+
+    // As long as service runs at least one event handler, loop until
+    // we've hit our goals.  It won't return zero unless is out of
+    // work or the service has been stopped by the test timer.
+    int cnt = 0;
+    while ((cnt = io_service_.get_io_service().run_one())
+            && (one_shot_count < 4)) {
+        // deliberately empty
+    };
+
+    // If cnt is zero, then something went wrong.
+    EXPECT_TRUE(cnt > 0);
+
+    // Verify the timer repeated.
+    EXPECT_GE(one_shot_count, 4);
+}
diff --git a/src/lib/asiolink/tests/io_address_unittest.cc b/src/lib/asiolink/tests/io_address_unittest.cc
new file mode 100644
index 0000000..b113940
--- /dev/null
+++ b/src/lib/asiolink/tests/io_address_unittest.cc
@@ -0,0 +1,370 @@
+// Copyright (C) 2011-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <gtest/gtest.h>
+
+#include <asiolink/io_error.h>
+#include <asiolink/io_address.h>
+#include <exceptions/exceptions.h>
+
+#include <algorithm>
+#include <cstring>
+#include <vector>
+#include <sstream>
+#include <unordered_set>
+
+using namespace isc::asiolink;
+
+TEST(IOAddressHashTest, hashIPv4) {
+    IOAddress::Hash hash;
+    std::unordered_set<size_t> results;
+    for (uint32_t i = 0; i < 10; i++) {
+        IOAddress address(i);
+        auto result = hash(address);
+        results.insert(result);
+    }
+    // Make sure that the hashing function generated a unique hash for
+    // each address.
+    EXPECT_EQ(10, results.size());
+}
+
+TEST(IOAddressHashTest, hashIPv6) {
+    IOAddress::Hash hash;
+    std::unordered_set<size_t> results;
+    for (auto i = 0; i < 10; i++) {
+        std::ostringstream s;
+        s << "2001:db8:" << i << "::ffff";
+        IOAddress address(s.str());
+        auto result = hash(address);
+        results.insert(result);
+    }
+    // Make sure that the hashing function generated a unique hash for
+    // each address.
+    EXPECT_EQ(10, results.size());
+}
+
+TEST(IOAddressTest, fromText) {
+    IOAddress io_address_v4("192.0.2.1");
+    EXPECT_EQ("192.0.2.1", io_address_v4.toText());
+
+    IOAddress io_address_v6("2001:db8::1234");
+    EXPECT_EQ("2001:db8::1234", io_address_v6.toText());
+
+    // bogus IPv4 address-like input
+    EXPECT_THROW(IOAddress("192.0.2.2.1"), IOError);
+
+    // bogus IPv4 address-like input: out-of-range octet
+    EXPECT_THROW(IOAddress("192.0.2.300"), IOError);
+
+    // bogus IPv6 address-like input
+    EXPECT_THROW(IOAddress("2001:db8:::1234"), IOError);
+
+    // bogus IPv6 address-like input
+    EXPECT_THROW(IOAddress("2001:db8::efgh"), IOError);
+}
+
+TEST(IOAddressTest, Equality) {
+    EXPECT_TRUE(IOAddress("192.0.2.1") == IOAddress("192.0.2.1"));
+    EXPECT_FALSE(IOAddress("192.0.2.1") != IOAddress("192.0.2.1"));
+
+    EXPECT_TRUE(IOAddress("192.0.2.1") != IOAddress("192.0.2.2"));
+    EXPECT_FALSE(IOAddress("192.0.2.1") == IOAddress("192.0.2.2"));
+
+    EXPECT_TRUE(IOAddress("2001:db8::12") == IOAddress("2001:0DB8:0:0::0012"));
+    EXPECT_FALSE(IOAddress("2001:db8::12") != IOAddress("2001:0DB8:0:0::0012"));
+
+    EXPECT_TRUE(IOAddress("2001:db8::1234") != IOAddress("2001:db8::1235"));
+    EXPECT_FALSE(IOAddress("2001:db8::1234") == IOAddress("2001:db8::1235"));
+
+    EXPECT_TRUE(IOAddress("2001:db8::1234") != IOAddress("192.0.2.3"));
+    EXPECT_FALSE(IOAddress("2001:db8::1234") == IOAddress("192.0.2.3"));
+}
+
+TEST(IOAddressTest, Family) {
+    EXPECT_EQ(AF_INET, IOAddress("192.0.2.1").getFamily());
+    EXPECT_EQ(AF_INET6, IOAddress("2001:0DB8:0:0::0012").getFamily());
+}
+
+TEST(IOAddressTest, fromBytes) {
+    // 2001:db8:1::dead:beef
+    uint8_t v6[] = {
+        0x20, 0x01, 0x0d, 0xb8, 0x00, 0x01, 0, 0,
+        0, 0, 0, 0, 0xde, 0xad, 0xbe, 0xef };
+
+    uint8_t v4[] = { 192, 0 , 2, 3 };
+
+    IOAddress addr("::");
+    EXPECT_NO_THROW({
+        addr = IOAddress::fromBytes(AF_INET6, v6);
+    });
+    EXPECT_EQ("2001:db8:1::dead:beef", addr.toText());
+
+    EXPECT_NO_THROW({
+        addr = IOAddress::fromBytes(AF_INET, v4);
+    });
+    EXPECT_EQ(addr, IOAddress("192.0.2.3"));
+}
+
+TEST(IOAddressTest, toBytesV4) {
+    // Address and network byte-order representation of the address.
+    const char* V4STRING = "192.0.2.1";
+    uint8_t V4[] = {0xc0, 0x00, 0x02, 0x01};
+
+    std::vector<uint8_t> actual = IOAddress(V4STRING).toBytes();
+    ASSERT_EQ(sizeof(V4), actual.size());
+    EXPECT_TRUE(std::equal(actual.begin(), actual.end(), V4));
+}
+
+TEST(IOAddressTest, toBytesV6) {
+    // Address and network byte-order representation of the address.
+    const char* V6STRING = "2001:db8:1::dead:beef";
+    uint8_t V6[] = {
+        0x20, 0x01, 0x0d, 0xb8, 0x00, 0x01, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0xde, 0xad, 0xbe, 0xef
+    };
+
+    std::vector<uint8_t> actual = IOAddress(V6STRING).toBytes();
+    ASSERT_EQ(sizeof(V6), actual.size());
+    EXPECT_TRUE(std::equal(actual.begin(), actual.end(), V6));
+}
+
+TEST(IOAddressTest, isV4) {
+    const IOAddress address4("192.0.2.1");
+    const IOAddress address6("2001:db8:1::dead:beef");
+
+    EXPECT_TRUE(address4.isV4());
+    EXPECT_FALSE(address6.isV4());
+}
+
+TEST(IOAddressTest, isV4Zero) {
+    // 0.0.0.0
+    const IOAddress address_zero("0.0.0.0");
+    EXPECT_TRUE(address_zero.isV4Zero());
+    // :: (v6 zero address)
+    const IOAddress address_zero_v6("::");
+    EXPECT_FALSE(address_zero_v6.isV4Zero());
+    // 192.0.2.3
+    const IOAddress address_non_zero("192.0.2.3");
+    EXPECT_FALSE(address_non_zero.isV4Zero());
+    // 0.0.0.100
+    const IOAddress address_non_zero1("0.0.0.100");
+    EXPECT_FALSE(address_non_zero1.isV4Zero());
+    // 64.0.0.0
+    const IOAddress address_non_zero2("64.0.0.0");
+    EXPECT_FALSE(address_non_zero2.isV4Zero());
+}
+
+TEST(IOAddressTest, isV4Bcast) {
+    // 255.255.255.255
+    const IOAddress address_bcast("255.255.255.255");
+    EXPECT_TRUE(address_bcast.isV4Bcast());
+    // 10.2.3.4
+    const IOAddress address_non_bcast("10.2.3.4");
+    EXPECT_FALSE(address_non_bcast.isV4Bcast());
+    // 255.255.255.23
+    const IOAddress address_non_bcast1("255.255.255.23");
+    EXPECT_FALSE(address_non_bcast1.isV4Bcast());
+    // 123.255.255.255
+    const IOAddress address_non_bcast2("123.255.255.255");
+    EXPECT_FALSE(address_non_bcast2.isV4Bcast());
+
+}
+
+TEST(IOAddressTest, isV6) {
+    const IOAddress address4("192.0.2.1");
+    const IOAddress address6("2001:db8:1::dead:beef");
+
+    EXPECT_FALSE(address4.isV6());
+    EXPECT_TRUE(address6.isV6());
+}
+
+TEST(IOAddressTest, isV6Zero) {
+    // ::
+    const IOAddress address_zero("::");
+    EXPECT_TRUE(address_zero.isV6Zero());
+    // 0.0.0.0
+    const IOAddress address_non_zero("0.0.0.0");
+    EXPECT_FALSE(address_non_zero.isV6Zero());
+    // ::ff
+    const IOAddress address_non_zero1("::ff");
+    EXPECT_FALSE(address_non_zero1.isV6Zero());
+    // ff::
+    const IOAddress address_non_zero2("ff::");
+    EXPECT_FALSE(address_non_zero2.isV6Zero());
+}
+
+TEST(IOAddressTest, uint32) {
+    IOAddress addr1("192.0.2.5");
+
+    // operator uint_32() is used here
+    uint32_t tmp = addr1.toUint32();
+
+    uint32_t expected = (192U << 24) +  (0U << 16) + (2U << 8) + 5U;
+
+    EXPECT_EQ(expected, tmp);
+
+    // now let's try opposite conversion
+    IOAddress addr3 = IOAddress(expected);
+
+    EXPECT_EQ(addr3.toText(), "192.0.2.5");
+}
+
+TEST(IOAddressTest, lessThanEqual) {
+    IOAddress addr1("192.0.2.5");
+    IOAddress addr2("192.0.2.6");
+    IOAddress addr3("0.0.0.0");
+
+    IOAddress addr4("::");
+    IOAddress addr5("2001:db8::1");
+    IOAddress addr6("2001:db8::1:0");
+    IOAddress addr7("2001:db8::1:0"); // the same as 6
+
+    // v4 comparisons
+    EXPECT_TRUE(addr1 < addr2);
+    EXPECT_FALSE(addr2 < addr1);
+    EXPECT_FALSE(addr2 <= addr1);
+    EXPECT_TRUE(addr3 < addr1);
+    EXPECT_TRUE(addr3 < addr2);
+    EXPECT_TRUE(addr3 <= addr2);
+
+    // v6 comparisons
+    EXPECT_TRUE(addr4 < addr5);
+    EXPECT_TRUE(addr5 < addr6);
+    EXPECT_FALSE(addr6 < addr5);
+    EXPECT_FALSE(addr6 <= addr5);
+
+    // v4 to v6 - v4 should always be smaller
+    EXPECT_TRUE(addr1 < addr4);
+    EXPECT_TRUE(addr3 < addr4);
+    EXPECT_TRUE(addr2 < addr5);
+
+    EXPECT_TRUE(addr6 <= addr7);
+}
+
+// test operator<<.  We simply confirm it appends the result of toText().
+TEST(IOAddressTest, LeftShiftOperator) {
+    const IOAddress addr("192.0.2.5");
+
+    std::ostringstream oss;
+    oss << addr;
+    EXPECT_EQ(addr.toText(), oss.str());
+}
+
+// Tests address classification methods (which were previously used by accessing
+// underlying asio objects directly)
+TEST(IOAddressTest, accessClassificationMethods) {
+    IOAddress addr1("192.0.2.5"); // IPv4
+    IOAddress addr2("::");  // IPv6
+    IOAddress addr3("2001:db8::1"); // global IPv6
+    IOAddress addr4("fe80::1234");  // link-local
+    IOAddress addr5("ff02::1:2");   // multicast
+
+    EXPECT_TRUE (addr1.isV4());
+    EXPECT_FALSE(addr1.isV6());
+    EXPECT_FALSE(addr1.isV6LinkLocal());
+    EXPECT_FALSE(addr1.isV6Multicast());
+
+    EXPECT_FALSE(addr2.isV4());
+    EXPECT_TRUE (addr2.isV6());
+    EXPECT_FALSE(addr2.isV6LinkLocal());
+    EXPECT_FALSE(addr2.isV6Multicast());
+
+    EXPECT_FALSE(addr3.isV4());
+    EXPECT_TRUE (addr3.isV6());
+    EXPECT_FALSE(addr3.isV6LinkLocal());
+    EXPECT_FALSE(addr3.isV6Multicast());
+
+    EXPECT_FALSE(addr4.isV4());
+    EXPECT_TRUE (addr4.isV6());
+    EXPECT_TRUE (addr4.isV6LinkLocal());
+    EXPECT_FALSE(addr4.isV6Multicast());
+
+    EXPECT_FALSE(addr5.isV4());
+    EXPECT_TRUE (addr5.isV6());
+    EXPECT_FALSE(addr5.isV6LinkLocal());
+    EXPECT_TRUE (addr5.isV6Multicast());
+}
+
+TEST(IOAddressTest, staticAddresses) {
+    EXPECT_EQ(IOAddress("0.0.0.0"), IOAddress::IPV4_ZERO_ADDRESS());
+    EXPECT_EQ(IOAddress("255.255.255.255"), IOAddress::IPV4_BCAST_ADDRESS());
+    EXPECT_EQ(IOAddress("::"), IOAddress::IPV6_ZERO_ADDRESS());
+}
+
+// Tests whether address subtraction works correctly.
+TEST(IOAddressTest, subtract) {
+    IOAddress addr1("192.0.2.12");
+    IOAddress addr2("192.0.2.5");
+    IOAddress addr3("192.0.2.0");
+    IOAddress addr4("0.0.2.1");
+    IOAddress any4("0.0.0.0");
+    IOAddress bcast("255.255.255.255");
+
+    EXPECT_EQ("0.0.0.7", IOAddress::subtract(addr1, addr2).toText());
+    EXPECT_EQ("0.0.0.12", IOAddress::subtract(addr1, addr3).toText());
+
+    // Subtracting 0.0.0.0 is like subtracting 0.
+    EXPECT_EQ("192.0.2.12", IOAddress::subtract(addr1, any4).toText());
+    EXPECT_EQ("192.0.2.13", IOAddress::subtract(addr1, bcast).toText());
+    EXPECT_EQ("191.255.255.255", IOAddress::subtract(addr3, addr4).toText());
+
+    // Let's check if we can subtract greater address from smaller.
+    // This will check if we can "loop"
+    EXPECT_EQ("255.255.255.251", IOAddress::subtract(addr3, addr2).toText());
+
+    IOAddress addr6("fe80::abcd");
+    IOAddress addr7("fe80::");
+    IOAddress addr8("fe80::1234");
+    IOAddress addr9("2001:db8::face");
+    IOAddress addr10("2001:db8::ffff:ffff:ffff:ffff");
+    IOAddress addr11("::1");
+    IOAddress any6("::");
+
+    EXPECT_EQ(IOAddress("::abcd"), IOAddress::subtract(addr6, addr7));
+    EXPECT_EQ(IOAddress("::9999"), IOAddress::subtract(addr6, addr8));
+    EXPECT_EQ("::ffff:ffff:ffff:531", IOAddress::subtract(addr10, addr9).toText());
+
+    // Subtract with borrow, extreme edition. Need to borrow one bit
+    // 112 times.
+    EXPECT_EQ("fe7f:ffff:ffff:ffff:ffff:ffff:ffff:ffff",
+              IOAddress::subtract(addr7, addr11).toText());
+
+    // Now check if we can loop beyond :: (:: - ::1 is a lot of F's)
+    EXPECT_EQ("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff",
+              IOAddress::subtract(any6, addr11).toText());
+
+    // Subtracting :: is like subtracting 0.
+    EXPECT_EQ("2001:db8::face", IOAddress::subtract(addr9, any6).toText());
+
+    // Let's check if we can subtract greater address from smaller.
+    // This will check if we can "loop"
+    EXPECT_EQ("ffff:ffff:ffff:ffff:ffff:ffff:ffff:edcc",
+              IOAddress::subtract(addr7, addr8).toText());
+
+    // Inter-family relations are not allowed.
+    EXPECT_THROW(IOAddress::subtract(addr1, addr6), isc::BadValue);
+    EXPECT_THROW(IOAddress::subtract(addr6, addr1), isc::BadValue);
+}
+
+// Test checks whether an address can be increased.
+TEST(IOAddressTest, increaseAddr) {
+    IOAddress addr1("192.0.2.12");
+    IOAddress any4("0.0.0.0");
+    IOAddress bcast("255.255.255.255");
+    IOAddress addr6("2001:db8::ffff:ffff:ffff:ffff");
+    IOAddress addr11("::1");
+    IOAddress any6("::");
+    IOAddress the_last_one("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff");
+
+    EXPECT_EQ("192.0.2.13", IOAddress::increase(addr1).toText());
+    EXPECT_EQ("0.0.0.1", IOAddress::increase(any4).toText());
+    EXPECT_EQ("0.0.0.0", IOAddress::increase(bcast).toText());
+    EXPECT_EQ("2001:db8:0:1::", IOAddress::increase(addr6).toText());
+    EXPECT_EQ(IOAddress("::2"), IOAddress::increase(addr11));
+    EXPECT_EQ(IOAddress("::1"), IOAddress::increase(any6));
+    EXPECT_EQ(IOAddress("::"), IOAddress::increase(the_last_one));
+}
diff --git a/src/lib/asiolink/tests/io_endpoint_unittest.cc b/src/lib/asiolink/tests/io_endpoint_unittest.cc
new file mode 100644
index 0000000..314a6a0
--- /dev/null
+++ b/src/lib/asiolink/tests/io_endpoint_unittest.cc
@@ -0,0 +1,286 @@
+// Copyright (C) 2011-2015 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <asiolink/io_endpoint.h>
+#include <asiolink/io_error.h>
+
+#include <gtest/gtest.h>
+
+#include <boost/shared_ptr.hpp>
+
+#include <sstream>
+#include <string>
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netdb.h>
+#include <string.h>
+
+using namespace isc::asiolink;
+
+namespace {
+typedef boost::shared_ptr<const IOEndpoint> ConstIOEndpointPtr;
+
+TEST(IOEndpointTest, createUDPv4) {
+    ConstIOEndpointPtr ep(IOEndpoint::create(IPPROTO_UDP,
+                                             IOAddress("192.0.2.1"), 53210));
+    EXPECT_EQ("192.0.2.1", ep->getAddress().toText());
+    EXPECT_EQ(53210, ep->getPort());
+    EXPECT_EQ(AF_INET, ep->getFamily());
+    EXPECT_EQ(AF_INET, ep->getAddress().getFamily());
+    EXPECT_EQ(static_cast<short>(IPPROTO_UDP), ep->getProtocol());
+}
+
+TEST(IOEndpointTest, createTCPv4) {
+    ConstIOEndpointPtr ep(IOEndpoint::create(IPPROTO_TCP,
+                                             IOAddress("192.0.2.1"), 5301));
+    EXPECT_EQ("192.0.2.1", ep->getAddress().toText());
+    EXPECT_EQ(5301, ep->getPort());
+    EXPECT_EQ(AF_INET, ep->getFamily());
+    EXPECT_EQ(AF_INET, ep->getAddress().getFamily());
+    EXPECT_EQ(static_cast<short>(IPPROTO_TCP), ep->getProtocol());
+}
+
+TEST(IOEndpointTest, createUDPv6) {
+    ConstIOEndpointPtr ep(IOEndpoint::create(IPPROTO_UDP,
+                                             IOAddress("2001:db8::1234"),
+                                             5302));
+    EXPECT_EQ("2001:db8::1234", ep->getAddress().toText());
+    EXPECT_EQ(5302, ep->getPort());
+    EXPECT_EQ(AF_INET6, ep->getFamily());
+    EXPECT_EQ(AF_INET6, ep->getAddress().getFamily());
+    EXPECT_EQ(static_cast<short>(IPPROTO_UDP), ep->getProtocol());
+}
+
+TEST(IOEndpointTest, createTCPv6) {
+    ConstIOEndpointPtr ep(IOEndpoint::create(IPPROTO_TCP,
+                                             IOAddress("2001:db8::1234"),
+                                             5303));
+    EXPECT_EQ("2001:db8::1234", ep->getAddress().toText());
+    EXPECT_EQ(5303, ep->getPort());
+    EXPECT_EQ(AF_INET6, ep->getFamily());
+    EXPECT_EQ(AF_INET6, ep->getAddress().getFamily());
+    EXPECT_EQ(static_cast<short>(IPPROTO_TCP), ep->getProtocol());
+}
+
+TEST(IOEndpointTest, equality) {
+    std::vector<ConstIOEndpointPtr> epv;
+    epv.push_back(ConstIOEndpointPtr(
+                      IOEndpoint::create(IPPROTO_TCP,
+                                         IOAddress("2001:db8::1234"), 5303)));
+    epv.push_back(ConstIOEndpointPtr(
+                      IOEndpoint::create(IPPROTO_UDP,
+                                         IOAddress("2001:db8::1234"), 5303)));
+    epv.push_back(ConstIOEndpointPtr(
+                      IOEndpoint::create(IPPROTO_TCP,
+                                         IOAddress("2001:db8::1234"), 5304)));
+    epv.push_back(ConstIOEndpointPtr(
+                      IOEndpoint::create(IPPROTO_UDP,
+                                         IOAddress("2001:db8::1234"), 5304)));
+    epv.push_back(ConstIOEndpointPtr(
+                      IOEndpoint::create(IPPROTO_TCP,
+                                         IOAddress("2001:db8::1235"), 5303)));
+    epv.push_back(ConstIOEndpointPtr(
+                      IOEndpoint::create(IPPROTO_UDP,
+                                         IOAddress("2001:db8::1235"), 5303)));
+    epv.push_back(ConstIOEndpointPtr(
+                      IOEndpoint::create(IPPROTO_TCP,
+                                         IOAddress("2001:db8::1235"), 5304)));
+    epv.push_back(ConstIOEndpointPtr(
+                      IOEndpoint::create(IPPROTO_UDP,
+                                         IOAddress("2001:db8::1235"), 5304)));
+    epv.push_back(ConstIOEndpointPtr(
+                      IOEndpoint::create(IPPROTO_TCP,
+                                         IOAddress("192.0.2.1"), 5303)));
+    epv.push_back(ConstIOEndpointPtr(
+                      IOEndpoint::create(IPPROTO_UDP,
+                                         IOAddress("192.0.2.1"), 5303)));
+    epv.push_back(ConstIOEndpointPtr(
+                      IOEndpoint::create(IPPROTO_TCP,
+                                         IOAddress("192.0.2.1"), 5304)));
+    epv.push_back(ConstIOEndpointPtr(
+                      IOEndpoint::create(IPPROTO_UDP,
+                                         IOAddress("192.0.2.1"), 5304)));
+    epv.push_back(ConstIOEndpointPtr(
+                      IOEndpoint::create(IPPROTO_TCP,
+                                         IOAddress("192.0.2.2"), 5303)));
+    epv.push_back(ConstIOEndpointPtr(
+                      IOEndpoint::create(IPPROTO_UDP,
+                                         IOAddress("192.0.2.2"), 5303)));
+    epv.push_back(ConstIOEndpointPtr(
+                      IOEndpoint::create(IPPROTO_TCP,
+                                         IOAddress("192.0.2.2"), 5304)));
+    epv.push_back(ConstIOEndpointPtr(
+                      IOEndpoint::create(IPPROTO_UDP,
+                                         IOAddress("192.0.2.2"), 5304)));
+
+    for (size_t i = 0; i < epv.size(); ++i) {
+        for (size_t j = 0; j < epv.size(); ++j) {
+            if (i != j) {
+                // We use EXPECT_TRUE/FALSE instead of _EQ here, since
+                // _EQ requires there is an operator<< as well
+                EXPECT_FALSE(*epv[i] == *epv[j]);
+                EXPECT_TRUE(*epv[i] != *epv[j]);
+            }
+        }
+    }
+
+    // Create a second array with exactly the same values. We use create()
+    // again to make sure we get different endpoints
+    std::vector<ConstIOEndpointPtr> epv2;
+    epv2.push_back(ConstIOEndpointPtr(
+                       IOEndpoint::create(IPPROTO_TCP,
+                                          IOAddress("2001:db8::1234"), 5303)));
+    epv2.push_back(ConstIOEndpointPtr(
+                       IOEndpoint::create(IPPROTO_UDP,
+                                          IOAddress("2001:db8::1234"), 5303)));
+    epv2.push_back(ConstIOEndpointPtr(
+                       IOEndpoint::create(IPPROTO_TCP,
+                                          IOAddress("2001:db8::1234"), 5304)));
+    epv2.push_back(ConstIOEndpointPtr(
+                       IOEndpoint::create(IPPROTO_UDP,
+                                          IOAddress("2001:db8::1234"), 5304)));
+    epv2.push_back(ConstIOEndpointPtr(
+                       IOEndpoint::create(IPPROTO_TCP,
+                                          IOAddress("2001:db8::1235"), 5303)));
+    epv2.push_back(ConstIOEndpointPtr(
+                       IOEndpoint::create(IPPROTO_UDP,
+                                          IOAddress("2001:db8::1235"), 5303)));
+    epv2.push_back(ConstIOEndpointPtr(
+                       IOEndpoint::create(IPPROTO_TCP,
+                                          IOAddress("2001:db8::1235"), 5304)));
+    epv2.push_back(ConstIOEndpointPtr(
+                       IOEndpoint::create(IPPROTO_UDP,
+                                          IOAddress("2001:db8::1235"), 5304)));
+    epv2.push_back(ConstIOEndpointPtr(
+                       IOEndpoint::create(IPPROTO_TCP,
+                                          IOAddress("192.0.2.1"), 5303)));
+    epv2.push_back(ConstIOEndpointPtr(
+                       IOEndpoint::create(IPPROTO_UDP,
+                                          IOAddress("192.0.2.1"), 5303)));
+    epv2.push_back(ConstIOEndpointPtr(
+                       IOEndpoint::create(IPPROTO_TCP, IOAddress("192.0.2.1"),
+                                          5304)));
+    epv2.push_back(ConstIOEndpointPtr(
+                       IOEndpoint::create(IPPROTO_UDP, IOAddress("192.0.2.1"),
+                                          5304)));
+    epv2.push_back(ConstIOEndpointPtr(
+                       IOEndpoint::create(IPPROTO_TCP, IOAddress("192.0.2.2"),
+                                          5303)));
+    epv2.push_back(ConstIOEndpointPtr(
+                       IOEndpoint::create(IPPROTO_UDP, IOAddress("192.0.2.2"),
+                                          5303)));
+    epv2.push_back(ConstIOEndpointPtr(
+                       IOEndpoint::create(IPPROTO_TCP, IOAddress("192.0.2.2"),
+                                          5304)));
+    epv2.push_back(ConstIOEndpointPtr(
+                       IOEndpoint::create(IPPROTO_UDP, IOAddress("192.0.2.2"),
+                                          5304)));
+
+    for (size_t i = 0; i < epv.size(); ++i) {
+        EXPECT_TRUE(*epv[i] == *epv2[i]);
+        EXPECT_FALSE(*epv[i] != *epv2[i]);
+    }
+}
+
+TEST(IOEndpointTest, createIPProto) {
+    EXPECT_THROW(IOEndpoint::create(IPPROTO_IP, IOAddress("192.0.2.1"),
+                                    53210)->getAddress().toText(),
+                 IOError);
+}
+
+void
+sockAddrMatch(const struct sockaddr& actual_sa,
+              const char* const expected_addr_text,
+              const char* const expected_port_text)
+{
+    struct addrinfo hints;
+    memset(&hints, 0, sizeof(hints));
+    hints.ai_family = AF_UNSPEC;
+    hints.ai_socktype = SOCK_DGRAM; // this shouldn't matter
+    hints.ai_flags = AI_NUMERICHOST | AI_NUMERICSERV;
+
+    struct addrinfo* res;
+    ASSERT_EQ(0, getaddrinfo(expected_addr_text, expected_port_text, &hints,
+                             &res));
+    EXPECT_EQ(res->ai_family, actual_sa.sa_family);
+#ifdef HAVE_SA_LEN
+    // ASIO doesn't seem to set sa_len, so we set it to the expected value
+    res->ai_addr->sa_len = actual_sa.sa_len;
+#endif
+    EXPECT_EQ(0, memcmp(res->ai_addr, &actual_sa, res->ai_addrlen));
+    freeaddrinfo(res);
+}
+
+TEST(IOEndpointTest, getSockAddr) {
+    // UDP/IPv4
+    ConstIOEndpointPtr ep(IOEndpoint::create(IPPROTO_UDP,
+                                             IOAddress("192.0.2.1"), 53210));
+    sockAddrMatch(ep->getSockAddr(), "192.0.2.1", "53210");
+
+    // UDP/IPv6
+    ep.reset(IOEndpoint::create(IPPROTO_UDP, IOAddress("2001:db8::53"), 53));
+    sockAddrMatch(ep->getSockAddr(), "2001:db8::53", "53");
+
+    // TCP/IPv4
+    ep.reset(IOEndpoint::create(IPPROTO_TCP, IOAddress("192.0.2.2"), 53211));
+    sockAddrMatch(ep->getSockAddr(), "192.0.2.2", "53211");
+
+    // TCP/IPv6
+    ep.reset(IOEndpoint::create(IPPROTO_UDP, IOAddress("2001:db8::5300"), 35));
+    sockAddrMatch(ep->getSockAddr(), "2001:db8::5300", "35");
+}
+
+// A faked IOEndpoint for an uncommon address family.  It wouldn't be possible
+// to create via the normal factory, so we define a special derived class
+// for it.
+class TestIOEndpoint : public IOEndpoint {
+    virtual IOAddress getAddress() const {
+        return IOAddress("2001:db8::bad:add");
+    }
+    virtual uint16_t getPort() const { return (42); }
+    virtual short getProtocol() const { return (IPPROTO_UDP); }
+    virtual short getFamily() const { return (AF_UNSPEC); }
+    virtual const struct sockaddr& getSockAddr() const {
+        static struct sockaddr sa_placeholder;
+        return (sa_placeholder);
+    }
+};
+
+void
+checkEndpointText(const std::string& expected, const IOEndpoint& ep) {
+    std::ostringstream oss;
+    oss << ep;
+    EXPECT_EQ(expected, oss.str());
+}
+
+// test operator<<.  We simply confirm it appends the result of toText().
+TEST(IOEndpointTest, LeftShiftOperator) {
+    // UDP/IPv4
+    ConstIOEndpointPtr ep(IOEndpoint::create(IPPROTO_UDP,
+                                             IOAddress("192.0.2.1"), 53210));
+    checkEndpointText("192.0.2.1:53210", *ep);
+
+    // UDP/IPv6
+    ep.reset(IOEndpoint::create(IPPROTO_UDP, IOAddress("2001:db8::53"), 53));
+    checkEndpointText("[2001:db8::53]:53", *ep);
+
+    // Same for TCP: shouldn't be different
+    ep.reset(IOEndpoint::create(IPPROTO_TCP, IOAddress("192.0.2.1"), 53210));
+    checkEndpointText("192.0.2.1:53210", *ep);
+    ep.reset(IOEndpoint::create(IPPROTO_TCP, IOAddress("2001:db8::53"), 53));
+    checkEndpointText("[2001:db8::53]:53", *ep);
+
+    // Uncommon address family.  The actual behavior doesn't matter much
+    // in practice, but we check such input doesn't make it crash.
+    // We explicitly instantiate the test EP because otherwise some compilers
+    // would be confused and complain.
+    TestIOEndpoint test_ep;
+    checkEndpointText("2001:db8::bad:add:42", test_ep);
+}
+}
diff --git a/src/lib/asiolink/tests/io_service_signal_unittests.cc b/src/lib/asiolink/tests/io_service_signal_unittests.cc
new file mode 100644
index 0000000..1dd41a6
--- /dev/null
+++ b/src/lib/asiolink/tests/io_service_signal_unittests.cc
@@ -0,0 +1,282 @@
+// Copyright (C) 2014-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <exceptions/exceptions.h>
+#include <asiolink/interval_timer.h>
+#include <asiolink/io_service_signal.h>
+#include <asiolink/testutils/timed_signal.h>
+
+#include <gtest/gtest.h>
+
+#include <functional>
+#include <queue>
+
+using namespace isc::asiolink::test;
+namespace ph = std::placeholders;
+
+namespace isc {
+namespace asiolink {
+
+/// @brief Test fixture for testing the use of IO service signals.
+///
+/// This fixture is exercises IO service signaling.
+class IOSignalTest : public ::testing::Test {
+public:
+    /// @brief IOService instance to process IO.
+    asiolink::IOServicePtr io_service_;
+
+    /// @brief Failsafe timer to ensure test(s) do not hang.
+    isc::asiolink::IntervalTimer test_timer_;
+
+    /// @brief Maximum time should be allowed to run.
+    int test_time_ms_;
+
+    /// @brief IOSignalSet object.
+    IOSignalSetPtr io_signal_set_;
+
+    /// @brief Vector to record the signal values received.
+    std::vector<int> processed_signals_;
+
+    /// @brief The number of signals that must be received to stop the test.
+    int stop_at_count_;
+
+    /// @brief Boolean which causes IOSignalHandler to throw if true.
+    bool handler_throw_error_;
+
+    /// @brief Constructor.
+    IOSignalTest() :
+        io_service_(new asiolink::IOService()), test_timer_(*io_service_),
+        test_time_ms_(0), io_signal_set_(),
+        processed_signals_(), stop_at_count_(0), handler_throw_error_(false) {
+
+        io_signal_set_.reset(new IOSignalSet(io_service_,
+                                             std::bind(&IOSignalTest::processSignal,
+                                                       this, ph::_1)));
+    }
+
+    /// @brief Destructor.
+    ~IOSignalTest() {
+        io_signal_set_.reset();
+        // Make sure the cancel handler for the IOSignalSet is called.
+        io_service_->poll();
+    }
+
+    /// @brief Method used as the IOSignalSet handler.
+    ///
+    /// Records the value of the given signal and checks if the desired
+    /// number of signals have been received.  If so, the IOService is
+    /// stopped which will cause IOService::run() to exit, returning control
+    /// to the test.
+    ///
+    /// @param signum signal number.
+    void processSignal(int signum) {
+        // Remember the signal we got.
+        processed_signals_.push_back(signum);
+
+        // If the flag is on, force a throw to test error handling.
+        if (handler_throw_error_) {
+            handler_throw_error_ = false;
+            isc_throw(BadValue, "processSignal throwing simulated error");
+        }
+
+        // If we've hit the number we want stop the IOService. This will cause
+        // run to exit.
+        if (processed_signals_.size() >= stop_at_count_) {
+            io_service_->stop();
+        }
+    }
+
+    /// @brief Sets the failsafe timer for the test to the given time.
+    ///
+    /// @param  test_time_ms maximum time in milliseconds the test should
+    /// be allowed to run.
+    void setTestTime(int test_time_ms) {
+        // Fail safe shutdown
+        test_time_ms_ = test_time_ms;
+        test_timer_.setup(std::bind(&IOSignalTest::testTimerHandler, this),
+                          test_time_ms_, asiolink::IntervalTimer::ONE_SHOT);
+    }
+
+    /// @brief Failsafe timer expiration handler.
+    void testTimerHandler() {
+        io_service_->stop();
+        FAIL() << "Test Time: " << test_time_ms_ << " expired";
+    }
+};
+
+// Test the basic mechanics of IOSignal by handling one signal occurrence.
+TEST_F(IOSignalTest, singleSignalTest) {
+    // Set test fail safe.
+    setTestTime(1000);
+
+    // Register to receive SIGINT.
+    ASSERT_NO_THROW(io_signal_set_->add(SIGINT));
+
+    // Use TimedSignal to generate SIGINT 100 ms after we start IOService::run.
+    TimedSignal sig_int(*io_service_, SIGINT, 100);
+
+    // The first handler executed is the IOSignal's internal timer expire
+    // callback.
+    io_service_->run_one();
+
+    // The next handler executed is IOSignal's handler.
+    io_service_->run_one();
+
+    // Polling once to be sure.
+    io_service_->poll();
+
+    // Verify that we processed the signal.
+    ASSERT_EQ(1, processed_signals_.size());
+
+    // Now check that signal value is correct.
+    EXPECT_EQ(SIGINT, processed_signals_[0]);
+
+    // Set test fail safe.
+    setTestTime(1000);
+
+    // Unregister the receive of SIGINT.
+    ASSERT_NO_THROW(io_signal_set_->remove(SIGINT));
+
+    // Use TimedSignal to generate SIGINT 100 ms after we start IOService::run.
+    TimedSignal sig_int_too_late(*io_service_, SIGINT, 100);
+
+    // The first handler executed is the IOSignal's internal timer expire
+    // callback.
+    io_service_->run_one();
+
+    // The next handler executed is IOSignal's handler.
+    io_service_->run_one();
+
+    // Polling once to be sure.
+    io_service_->poll();
+
+    // Verify that we did not process the signal.
+    ASSERT_EQ(1, processed_signals_.size());
+}
+
+// Test verifies that signals can be delivered rapid-fire without falling over.
+TEST_F(IOSignalTest, hammer) {
+    // Set test fail safe.  We want to allow at least 100 ms per signal,
+    // plus a bit more so 6 seconds ought to be enough.
+    setTestTime(6000);
+
+    // Register to receive SIGINT.
+    ASSERT_NO_THROW(io_signal_set_->add(SIGINT));
+
+    // Stop the test after 50 signals. This allows 100ms+ per signal
+    // so even sluggish VMs should handle it.
+    stop_at_count_ = 50;
+
+    // User a repeating TimedSignal so we should generate a signal every 1 ms
+    // until we hit our stop count.
+    TimedSignal sig_int(*io_service_, SIGINT, 1,
+                        asiolink::IntervalTimer::REPEATING);
+
+    // Start processing IO.  This should continue until we stop either by
+    // hitting the stop count or if things go wrong, max test time.
+    io_service_->run();
+
+    // Verify we received the expected number of signals.
+    EXPECT_EQ(stop_at_count_, processed_signals_.size());
+
+    // Now check that each signal value is correct. This is sort of a silly
+    // check but it does ensure things didn't go off the rails somewhere.
+    for (int i = 0; i < processed_signals_.size(); ++i) {
+        EXPECT_EQ(SIGINT, processed_signals_[i]);
+    }
+}
+
+// Verifies that handler exceptions are caught.
+TEST_F(IOSignalTest, handlerThrow) {
+    // Set test fail safe.
+    setTestTime(1000);
+
+    // Register to receive SIGINT.
+    ASSERT_NO_THROW(io_signal_set_->add(SIGINT));
+
+    // Set the stop after we've done at least 1 all the way through.
+    stop_at_count_ = 1;
+
+    // Use TimedSignal to generate SIGINT after we start IOService::run.
+    TimedSignal sig_int(*io_service_, SIGINT, 100,
+                        asiolink::IntervalTimer::REPEATING);
+
+    // Set the test flag to cause the handler to throw an exception.
+    handler_throw_error_ = true;
+
+    // Start processing IO.  This should fail with the handler exception.
+    ASSERT_NO_THROW(io_service_->run());
+
+    // Verify that the we hit the throw block.  The flag will be false
+    // we will have skipped the stop count check so number signals processed
+    // is stop_at_count_ + 1.
+    EXPECT_FALSE(handler_throw_error_);
+    EXPECT_EQ(stop_at_count_ + 1, processed_signals_.size());
+}
+
+// Verifies that we can handle a mixed set of signals.
+TEST_F(IOSignalTest, mixedSignals) {
+    // Set test fail safe.
+    setTestTime(1000);
+
+    // Register to receive SIGINT, SIGUSR1, and SIGUSR2.
+    ASSERT_NO_THROW(io_signal_set_->add(SIGINT));
+    ASSERT_NO_THROW(io_signal_set_->add(SIGUSR1));
+    ASSERT_NO_THROW(io_signal_set_->add(SIGUSR2));
+
+    stop_at_count_ = 8;
+
+    // User a repeating TimedSignal so we should generate a signal every 3, 5
+    // and 7 ms until we hit our stop count.
+    TimedSignal sig_1(*io_service_, SIGINT, 3,
+                      asiolink::IntervalTimer::REPEATING);
+    TimedSignal sig_2(*io_service_, SIGUSR1, 5,
+                      asiolink::IntervalTimer::REPEATING);
+    TimedSignal sig_3(*io_service_, SIGUSR2, 7,
+                      asiolink::IntervalTimer::REPEATING);
+
+    // Start processing IO.  This should continue until we stop either by
+    // hitting the stop count or if things go wrong, max test time.
+    io_service_->run();
+
+    // Verify we received the expected number of signals.
+    ASSERT_EQ(stop_at_count_, processed_signals_.size());
+
+    // There is no guarantee that the signals will always be delivered in the
+    // order they are raised, but all of them should get delivered.  Loop
+    // through and tally them up.
+    int sigint_cnt = 0;
+    int sigusr1_cnt = 0;
+    int sigusr2_cnt = 0;
+    for (int i = 0; i < stop_at_count_; ++i) {
+        switch (processed_signals_[i]) {
+        case SIGINT:
+            ++sigint_cnt;
+            break;
+        case SIGUSR1:
+            ++sigusr1_cnt;
+            break;
+        case SIGUSR2:
+            ++sigusr2_cnt;
+            break;
+        default:
+            FAIL() << "Invalid signal value: "
+                   << processed_signals_[i]
+                   << " at i:" << i;
+            break;
+        }
+    }
+
+    // See if our counts are correct.
+    EXPECT_EQ(sigint_cnt, 4);
+    EXPECT_EQ(sigusr1_cnt, 2);
+    EXPECT_EQ(sigusr2_cnt, 2);
+}
+
+} // namespace asiolink
+} // namespace isc
diff --git a/src/lib/asiolink/tests/io_service_thread_pool_unittests.cc b/src/lib/asiolink/tests/io_service_thread_pool_unittests.cc
new file mode 100644
index 0000000..d867011
--- /dev/null
+++ b/src/lib/asiolink/tests/io_service_thread_pool_unittests.cc
@@ -0,0 +1,264 @@
+// Copyright (C) 2021-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <asiolink/asio_wrapper.h>
+#include <asiolink/interval_timer.h>
+#include <asiolink/io_service.h>
+#include <asiolink/io_service_thread_pool.h>
+#include <exceptions/exceptions.h>
+#include <testutils/gtest_utils.h>
+
+#include <gtest/gtest.h>
+#include <string>
+
+using namespace isc;
+using namespace isc::asiolink;
+
+namespace {
+
+/// @brief Test timeout (ms).
+const long TEST_TIMEOUT = 10000;
+
+/// @brief Simple test fixture for testing IoServiceThreadPool.
+class IoServiceThreadPoolTest : public ::testing::Test {
+public:
+    /// @brief Constructor.
+    IoServiceThreadPoolTest()
+        : io_service_(new IOService()) {
+    }
+
+    /// @brief Destructor.
+    virtual ~IoServiceThreadPoolTest() {
+        io_service_->stop();
+    }
+
+    /// @brief IOService instance used by thread pools.
+    IOServicePtr io_service_;
+};
+
+// URL contains scheme and hostname.
+TEST_F(IoServiceThreadPoolTest, invalidConstruction) {
+    IoServiceThreadPoolPtr pool;
+
+    // Constructing with pool size of 0 should fail.
+    ASSERT_THROW_MSG(pool.reset(new IoServiceThreadPool(io_service_, 0)),
+                     BadValue, "pool_size must be non 0");
+}
+
+// Verifies that a pool can be created without starting it.
+TEST_F(IoServiceThreadPoolTest, deferredStartConstruction) {
+    IoServiceThreadPoolPtr pool;
+
+    ASSERT_NO_THROW_LOG(pool.reset(new IoServiceThreadPool(io_service_, 3, true)));
+
+    // State should be stopped.
+    // Pool size should be 3.
+    // IOService should be there.
+    // IOService is new, so it should not be stopped.
+    // No threads in the pool.
+    ASSERT_TRUE(pool->isStopped());
+    EXPECT_EQ(pool->getPoolSize(), 3);
+    ASSERT_TRUE(pool->getIOService());
+    EXPECT_FALSE(pool->getIOService()->stopped());
+    EXPECT_EQ(pool->getThreadCount(), 0);
+
+    // Destructor should not throw.
+    ASSERT_NO_THROW_LOG(pool.reset());
+}
+
+// Verifies that a pool can be started within the constructor.
+TEST_F(IoServiceThreadPoolTest, startDuringConstruction) {
+    IoServiceThreadPoolPtr pool;
+
+    ASSERT_NO_THROW_LOG(pool.reset(new IoServiceThreadPool(io_service_, 3)));
+
+    // State should be running.
+    // Pool size should be 3.
+    // IOService should be there.
+    // IOService is new, so it should not be stopped.
+    // Should have 3 threads in the pool.
+    ASSERT_TRUE(pool->isRunning());
+    EXPECT_EQ(pool->getPoolSize(), 3);
+    ASSERT_TRUE(pool->getIOService());
+    EXPECT_FALSE(pool->getIOService()->stopped());
+    EXPECT_EQ(pool->getThreadCount(), 3);
+
+    // Destructor should not throw.
+    ASSERT_NO_THROW_LOG(pool.reset());
+}
+
+// Verifies that pool can move from STOPPED to RUNNING.
+TEST_F(IoServiceThreadPoolTest, stoppedToRunning) {
+    IoServiceThreadPoolPtr pool;
+
+    // Create a stopped pool.
+    ASSERT_NO_THROW_LOG(pool.reset(new IoServiceThreadPool(io_service_, 3, true)));
+    ASSERT_TRUE(pool->isStopped());
+
+    // Call run from STOPPED.
+    ASSERT_NO_THROW_LOG(pool->run());
+
+    // State should be RUNNING, IOService should not be stopped, we should
+    // have 3 threads in the pool.
+    ASSERT_TRUE(pool->isRunning());
+    EXPECT_FALSE(pool->getIOService()->stopped());
+    EXPECT_EQ(pool->getThreadCount(), 3);
+
+    // Calling run again should be harmless.
+    ASSERT_NO_THROW_LOG(pool->run());
+
+    // State should be RUNNING, IOService should not be stopped, we should
+    // have 3 threads in the pool.
+    ASSERT_TRUE(pool->isRunning());
+    EXPECT_FALSE(pool->getIOService()->stopped());
+    EXPECT_EQ(pool->getThreadCount(), 3);
+
+    // Destroying the pool should be fine.
+    ASSERT_NO_THROW_LOG(pool.reset());
+}
+
+// Verifies that pool can move from RUNNING to STOPPED.
+TEST_F(IoServiceThreadPoolTest, runningToStopped) {
+    IoServiceThreadPoolPtr pool;
+
+    // Create a running pool.
+    ASSERT_NO_THROW_LOG(pool.reset(new IoServiceThreadPool(io_service_, 3, false)));
+    ASSERT_TRUE(pool->isRunning());
+
+    // Call stop.
+    ASSERT_NO_THROW_LOG(pool->stop());
+
+    // State should be STOPPED, IOService should be stopped, we should
+    // have 0 threads in the pool.
+    ASSERT_TRUE(pool->isStopped());
+    EXPECT_TRUE(pool->getIOService()->stopped());
+    EXPECT_EQ(pool->getThreadCount(), 0);
+
+    // Calling stop again should be harmless.
+    ASSERT_NO_THROW_LOG(pool->stop());
+
+    // State should be STOPPED, IOService should be stopped, we should
+    // have 0 threads in the pool.
+    ASSERT_TRUE(pool->isStopped());
+    EXPECT_TRUE(pool->getIOService()->stopped());
+    EXPECT_EQ(pool->getThreadCount(), 0);
+
+    // Destroying the pool should be fine.
+    ASSERT_NO_THROW_LOG(pool.reset());
+}
+
+// Verifies that pool can move from RUNNING to PAUSED.
+TEST_F(IoServiceThreadPoolTest, runningToPaused) {
+    IoServiceThreadPoolPtr pool;
+
+    // Create a running pool.
+    ASSERT_NO_THROW_LOG(pool.reset(new IoServiceThreadPool(io_service_, 3, false)));
+    ASSERT_TRUE(pool->isRunning());
+
+    // Call pause from RUNNING.
+    ASSERT_NO_THROW_LOG(pool->pause());
+
+    // State should be PAUSED, IOService should be stopped, we should
+    // have 3 threads in the pool.
+    ASSERT_TRUE(pool->isPaused());
+    EXPECT_TRUE(pool->getIOService()->stopped());
+    EXPECT_EQ(pool->getThreadCount(), 3);
+
+    // Calling pause again should be harmless.
+    ASSERT_NO_THROW_LOG(pool->pause());
+
+    // State should be PAUSED, IOService should be stopped, we should
+    // have 3 threads in the pool.
+    ASSERT_TRUE(pool->isPaused());
+    EXPECT_TRUE(pool->getIOService()->stopped());
+    EXPECT_EQ(pool->getThreadCount(), 3);
+
+    // Destroying the pool should be fine.
+    ASSERT_NO_THROW_LOG(pool.reset());
+}
+
+// Verifies that pool can move from PAUSED to RUNNING.
+TEST_F(IoServiceThreadPoolTest, pausedToRunning) {
+    IoServiceThreadPoolPtr pool;
+
+    // Create a running pool.
+    ASSERT_NO_THROW_LOG(pool.reset(new IoServiceThreadPool(io_service_, 3, false)));
+    ASSERT_TRUE(pool->isRunning());
+
+    // Call pause from RUNNING.
+    ASSERT_NO_THROW_LOG(pool->pause());
+    ASSERT_TRUE(pool->isPaused());
+
+    // Call run.
+    ASSERT_NO_THROW_LOG(pool->run());
+
+    // State should be RUNNING, IOService should not be stopped, we should
+    // have 3 threads in the pool.
+    ASSERT_TRUE(pool->isRunning());
+    EXPECT_FALSE(pool->getIOService()->stopped());
+    EXPECT_EQ(pool->getThreadCount(), 3);
+
+    // Destroying the pool should be fine.
+    ASSERT_NO_THROW_LOG(pool.reset());
+}
+
+// Verifies that pool can move from PAUSED to STOPPED.
+TEST_F(IoServiceThreadPoolTest, pausedToStopped) {
+    IoServiceThreadPoolPtr pool;
+
+    // Create a running pool.
+    ASSERT_NO_THROW_LOG(pool.reset(new IoServiceThreadPool(io_service_, 3, false)));
+    ASSERT_TRUE(pool->isRunning());
+
+    // Call pause from RUNNING.
+    ASSERT_NO_THROW_LOG(pool->pause());
+    ASSERT_TRUE(pool->isPaused());
+
+    // Call stop.
+    ASSERT_NO_THROW_LOG(pool->stop());
+
+    // State should be STOPPED, IOService should be stopped, we should
+    // have 0 threads in the pool.
+    ASSERT_TRUE(pool->isStopped());
+    EXPECT_TRUE(pool->getIOService()->stopped());
+    EXPECT_EQ(pool->getThreadCount(), 0);
+
+    // Destroying the pool should be fine.
+    ASSERT_NO_THROW_LOG(pool.reset());
+}
+
+// Verifies that attempting to pause a STOPPED pool has no effect.
+TEST_F(IoServiceThreadPoolTest, stoppedToPaused) {
+    IoServiceThreadPoolPtr pool;
+
+    // Create a stopped pool.
+    ASSERT_NO_THROW_LOG(pool.reset(new IoServiceThreadPool(io_service_, 3, true)));
+    ASSERT_TRUE(pool->isStopped());
+
+    // State should be STOPPED, IOService won't be stopped because it was
+    // never started. We should have 0 threads in the pool.
+    ASSERT_TRUE(pool->isStopped());
+    EXPECT_FALSE(pool->getIOService()->stopped());
+    EXPECT_EQ(pool->getThreadCount(), 0);
+
+    // Call pause from STOPPED.
+    ASSERT_NO_THROW_LOG(pool->pause());
+
+    // Should have no effect.
+    ASSERT_TRUE(pool->isStopped());
+
+    // State should be STOPPED, IOService won't be stopped because it was
+    // never started. We should have 0 threads in the pool.
+    ASSERT_TRUE(pool->isStopped());
+    EXPECT_FALSE(pool->getIOService()->stopped());
+    EXPECT_EQ(pool->getThreadCount(), 0);
+
+    // Destroying the pool should be fine.
+    ASSERT_NO_THROW_LOG(pool.reset());
+}
+
+}
diff --git a/src/lib/asiolink/tests/io_service_unittest.cc b/src/lib/asiolink/tests/io_service_unittest.cc
new file mode 100644
index 0000000..05fc5ac
--- /dev/null
+++ b/src/lib/asiolink/tests/io_service_unittest.cc
@@ -0,0 +1,48 @@
+// Copyright (C) 2013-2020 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <asiolink/io_service.h>
+
+#include <gtest/gtest.h>
+#include <functional>
+#include <vector>
+
+using namespace isc::asiolink;
+
+namespace {
+
+void
+postedEvent(std::vector<int>* destination, int value) {
+    destination->push_back(value);
+}
+
+// Check the posted events are called, in the same order they are posted.
+TEST(IOService, post) {
+    std::vector<int> called;
+    IOService service;
+    // Post two events
+    service.post(std::bind(&postedEvent, &called, 1));
+    service.post(std::bind(&postedEvent, &called, 2));
+    service.post(std::bind(&postedEvent, &called, 3));
+    // They have not yet been called
+    EXPECT_TRUE(called.empty());
+    // Process two events
+    service.run_one();
+    service.run_one();
+    // Both events were called in the right order
+    ASSERT_EQ(2, called.size());
+    EXPECT_EQ(1, called[0]);
+    EXPECT_EQ(2, called[1]);
+
+    // Test that poll() executes the last handler.
+    service.poll();
+    ASSERT_EQ(3, called.size());
+    EXPECT_EQ(3, called[2]);
+}
+
+}
diff --git a/src/lib/asiolink/tests/io_socket_unittest.cc b/src/lib/asiolink/tests/io_socket_unittest.cc
new file mode 100644
index 0000000..659a6a6
--- /dev/null
+++ b/src/lib/asiolink/tests/io_socket_unittest.cc
@@ -0,0 +1,25 @@
+// Copyright (C) 2011-2016 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <asiolink/asio_wrapper.h>
+#include <asiolink/io_socket.h>
+
+#include <gtest/gtest.h>
+#include <netinet/in.h>
+
+using namespace isc::asiolink;
+
+TEST(IOSocketTest, dummySockets) {
+    EXPECT_EQ(static_cast<short>(IPPROTO_UDP),
+              IOSocket::getDummyUDPSocket().getProtocol());
+    EXPECT_EQ(static_cast<short>(IPPROTO_TCP),
+              IOSocket::getDummyTCPSocket().getProtocol());
+    EXPECT_EQ(-1, IOSocket::getDummyUDPSocket().getNative());
+    EXPECT_EQ(-1, IOSocket::getDummyTCPSocket().getNative());
+}
+
+
diff --git a/src/lib/asiolink/tests/process_spawn_app.sh.in b/src/lib/asiolink/tests/process_spawn_app.sh.in
new file mode 100644
index 0000000..eab7310
--- /dev/null
+++ b/src/lib/asiolink/tests/process_spawn_app.sh.in
@@ -0,0 +1,75 @@
+#!/bin/sh
+
+# Copyright (C) 2015-2021 Internet Systems Consortium, Inc. ("ISC")
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+# This script is used for testing the ProcessSpawn utility class. This
+# class is used to fork and execute a new process. It also allows for
+# checking the exit code returned when the process terminates.
+# The unit tests execute this script via ProcessSpawn class with
+# different command line parameters to test the class functionality.
+#
+# In particular, they check if the class correctly records the exit code
+# returned. The exit code returned is controlled by the caller. It is
+# possible to explicitly specify the exit code to be returned using
+# the command line options. It is also possible to specify that the
+# exit code is "unique" for the process, so as the test can check
+# that two distinct processes spawned by the same ProcessSpawn
+# object may return different status code. The command line of this
+# script also allows for forcing the process to sleep so as the
+# test has much enough time to verify that the convenience methods
+# checking the state of the process, i.e. process running or not.
+
+# Exit with error if commands exit with non-zero and if undefined variables are
+# used.
+set -eu
+
+exit_code=
+
+while test "${#}" -gt 0
+do
+    option=${1}
+    case ${option} in
+        -p)
+            exit_code=${$}
+            ;;
+        -e)
+            shift
+            exit_code=${1-}
+            ;;
+        -s)
+            shift
+            sleep "${1}"
+            ;;
+        -v)
+            shift
+            VAR_NAME=${1}
+            shift
+            VAR_VALUE=${1}
+            EXPECTED=$(env | grep -E "^${VAR_NAME}=")
+            if ! test "${VAR_NAME}=${VAR_VALUE}" = "${EXPECTED}"; then
+                exit 123
+            fi
+            ;;
+        *)
+            exit 123
+            ;;
+    esac
+    # We've shifted in the loop so we may have run out of parameters in the
+    # meantime. Check again.
+    if test "${#}" -gt 0; then
+      shift
+    fi
+done
+
+# The exit code of 32 is returned when no args specified or
+# when only the -s arg has been specified.
+if [ -z "${exit_code}" ]; then
+    exit 32
+fi
+
+exit "${exit_code}"
diff --git a/src/lib/asiolink/tests/process_spawn_unittest.cc b/src/lib/asiolink/tests/process_spawn_unittest.cc
new file mode 100644
index 0000000..0fda5a1
--- /dev/null
+++ b/src/lib/asiolink/tests/process_spawn_unittest.cc
@@ -0,0 +1,350 @@
+// Copyright (C) 2015-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <asiolink/io_service_signal.h>
+#include <asiolink/interval_timer.h>
+#include <asiolink/process_spawn.h>
+#include <gtest/gtest.h>
+#include <signal.h>
+#include <stdint.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <testutils/gtest_utils.h>
+
+namespace {
+
+using namespace isc;
+using namespace isc::asiolink;
+using namespace std;
+namespace ph = std::placeholders;
+
+/// @brief Test fixture for testing the use of ProcessSpawn with IO service
+/// signals.
+///
+/// This fixture is exercises ProcessSpawn using IO service signaling.
+class ProcessSpawnTest : public ::testing::Test {
+public:
+    /// @brief IOService instance to process IO.
+    asiolink::IOServicePtr io_service_;
+
+    /// @brief Single instance of IOService.
+    static asiolink::IOServicePtr getIOService() {
+        static asiolink::IOServicePtr io_service(new asiolink::IOService());
+        return (io_service);
+    }
+
+    /// @brief Failsafe timer to ensure test(s) do not hang.
+    isc::asiolink::IntervalTimer test_timer_;
+
+    /// @brief Maximum time should be allowed to run.
+    int test_time_ms_;
+
+    /// @brief IOSignalSet object.
+    IOSignalSetPtr io_signal_set_;
+
+    /// @brief Vector to record the signal values received.
+    std::vector<int> processed_signals_;
+
+    /// @brief Constructor.
+    ProcessSpawnTest() :
+        io_service_(getIOService()), test_timer_(*io_service_),
+        test_time_ms_(0), io_signal_set_(), processed_signals_() {
+
+        io_signal_set_.reset(new IOSignalSet(io_service_,
+                                             std::bind(&ProcessSpawnTest::processSignal,
+                                                       this, ph::_1)));
+        io_signal_set_->add(SIGCHLD);
+    }
+
+    /// @brief Destructor.
+    ~ProcessSpawnTest() {
+        io_signal_set_->remove(SIGCHLD);
+        io_signal_set_.reset();
+        // Make sure the cancel handler for the IOSignalSet is called.
+        io_service_->poll();
+    }
+
+    /// @brief Method used as the IOSignalSet handler.
+    ///
+    /// Records the value of the given signal and checks if the desired
+    /// number of signals have been received.  If so, the IOService is
+    /// stopped which will cause IOService::run() to exit, returning control
+    /// to the test.
+    ///
+    /// @param signum signal number.
+    void processSignal(int signum) {
+        // Remember the signal we got.
+        processed_signals_.push_back(signum);
+    }
+
+    /// @brief Sets the failsafe timer for the test to the given time.
+    ///
+    /// @param  test_time_ms maximum time in milliseconds the test should
+    /// be allowed to run.
+    void setTestTime(int test_time_ms) {
+        // Fail safe shutdown
+        test_time_ms_ = test_time_ms;
+        test_timer_.setup(std::bind(&ProcessSpawnTest::testTimerHandler, this),
+                          test_time_ms_, asiolink::IntervalTimer::ONE_SHOT);
+    }
+
+    /// @brief Failsafe timer expiration handler.
+    void testTimerHandler() {
+        io_service_->stop();
+    }
+};
+
+// This test verifies that the external application can be ran with
+// arguments and that the exit code is gathered.
+TEST_F(ProcessSpawnTest, spawnWithArgs) {
+    vector<string> args;
+    args.push_back("-e");
+    args.push_back("64");
+
+    ProcessSpawn process(io_service_, TEST_SCRIPT_SH, args);
+    pid_t pid = 0;
+    ASSERT_NO_THROW(pid = process.spawn());
+
+    // Set test fail safe.
+    setTestTime(1000);
+
+    // The next handler executed is IOSignal's handler.
+    io_service_->run_one();
+
+    // The first handler executed is the IOSignal's internal timer expire
+    // callback.
+    io_service_->run_one();
+
+    // Polling once to be sure.
+    io_service_->poll();
+
+    ASSERT_EQ(1, processed_signals_.size());
+    ASSERT_EQ(SIGCHLD, processed_signals_[0]);
+
+    EXPECT_EQ(64, process.getExitStatus(pid));
+}
+
+// This test verifies that the external application can be ran with
+// arguments and environment variables that the exit code is gathered.
+TEST_F(ProcessSpawnTest, spawnWithArgsAndEnvVars) {
+    vector<string> args;
+    vector<string> vars;
+    args.push_back("-v");
+    args.push_back("TEST_VARIABLE_NAME");
+    args.push_back("TEST_VARIABLE_VALUE");
+    vars.push_back("TEST_VARIABLE_NAME=TEST_VARIABLE_VALUE");
+
+    ProcessSpawn process(io_service_, TEST_SCRIPT_SH, args, vars);
+    pid_t pid = 0;
+    ASSERT_NO_THROW(pid = process.spawn());
+
+    // Set test fail safe.
+    setTestTime(1000);
+
+    // The next handler executed is IOSignal's handler.
+    io_service_->run_one();
+
+    // The first handler executed is the IOSignal's internal timer expire
+    // callback.
+    io_service_->run_one();
+
+    // Polling once to be sure.
+    io_service_->poll();
+
+    ASSERT_EQ(1, processed_signals_.size());
+    ASSERT_EQ(SIGCHLD, processed_signals_[0]);
+
+    EXPECT_EQ(32, process.getExitStatus(pid));
+}
+
+// This test verifies that the single ProcessSpawn object can be used
+// to start two processes and that their status codes can be gathered.
+// It also checks that it is possible to clear the status of the
+// process.
+TEST_F(ProcessSpawnTest, spawnTwoProcesses) {
+    vector<string> args;
+    args.push_back("-p");
+
+    ProcessSpawn process(io_service_, TEST_SCRIPT_SH, args);
+    pid_t pid1 = 0;
+    ASSERT_NO_THROW(pid1 = process.spawn());
+
+    // Set test fail safe.
+    setTestTime(1000);
+
+    // The next handler executed is IOSignal's handler.
+    io_service_->run_one();
+
+    // The first handler executed is the IOSignal's internal timer expire
+    // callback.
+    io_service_->run_one();
+
+    // Polling once to be sure.
+    io_service_->poll();
+
+    pid_t pid2 = 0;
+    ASSERT_NO_THROW(pid2 = process.spawn());
+
+    // Set test fail safe.
+    setTestTime(1000);
+
+    // The next handler executed is IOSignal's handler.
+    io_service_->run_one();
+
+    // The first handler executed is the IOSignal's internal timer expire
+    // callback.
+    io_service_->run_one();
+
+    // Polling once to be sure.
+    io_service_->poll();
+
+    ASSERT_EQ(2, processed_signals_.size());
+    ASSERT_EQ(SIGCHLD, processed_signals_[0]);
+    ASSERT_EQ(SIGCHLD, processed_signals_[1]);
+
+    EXPECT_NE(process.getExitStatus(pid1), process.getExitStatus(pid2));
+
+    // Clear the status of the first process. An attempt to get the status
+    // for the cleared process should result in exception. But, there should
+    // be no exception for the second process.
+    process.clearState(pid1);
+    EXPECT_THROW(process.getExitStatus(pid1), InvalidOperation);
+    EXPECT_NO_THROW(process.getExitStatus(pid2));
+
+    process.clearState(pid2);
+    EXPECT_THROW(process.getExitStatus(pid2), InvalidOperation);
+}
+
+// This test verifies that the external application can be ran without
+// arguments and that the exit code is gathered.
+TEST_F(ProcessSpawnTest, spawnNoArgs) {
+    ProcessSpawn process(io_service_, TEST_SCRIPT_SH);
+    pid_t pid = 0;
+    ASSERT_NO_THROW(pid = process.spawn());
+
+    // Set test fail safe.
+    setTestTime(1000);
+
+    // The next handler executed is IOSignal's handler.
+    io_service_->run_one();
+
+    // The first handler executed is the IOSignal's internal timer expire
+    // callback.
+    io_service_->run_one();
+
+    // Polling once to be sure.
+    io_service_->poll();
+
+    ASSERT_EQ(1, processed_signals_.size());
+    ASSERT_EQ(SIGCHLD, processed_signals_[0]);
+
+    EXPECT_EQ(32, process.getExitStatus(pid));
+
+    ASSERT_NO_THROW(pid = process.spawn(true));
+
+    // Set test fail safe.
+    setTestTime(1000);
+
+    // The next handler executed is IOSignal's handler.
+    io_service_->run_one();
+
+    // The first handler executed is the IOSignal's internal timer expire
+    // callback.
+    io_service_->run_one();
+
+    // Polling once to be sure.
+    io_service_->poll();
+
+    ASSERT_EQ(2, processed_signals_.size());
+    ASSERT_EQ(SIGCHLD, processed_signals_[0]);
+    ASSERT_EQ(SIGCHLD, processed_signals_[1]);
+
+    EXPECT_THROW(process.getExitStatus(pid), InvalidOperation);
+}
+
+// This test verifies that the EXIT_FAILURE code is returned when
+// application can't be executed.
+TEST_F(ProcessSpawnTest, invalidExecutable) {
+    std::string expected = "File not found: foo";
+    ASSERT_THROW_MSG(ProcessSpawn process(io_service_, "foo"),
+                     ProcessSpawnError, expected);
+
+    std::string name = INVALID_TEST_SCRIPT_SH;
+
+    expected = "File not executable: ";
+    expected += name;
+    ASSERT_THROW_MSG(ProcessSpawn process(io_service_, name),
+                     ProcessSpawnError, expected);
+}
+
+// This test verifies that the full command line for the process is
+// returned.
+TEST_F(ProcessSpawnTest, getCommandLine) {
+    // Note that cases below are enclosed in separate scopes to make
+    // sure that the ProcessSpawn object is destroyed before a new
+    // object is created. Current implementation doesn't allow for
+    // having two ProcessSpawn objects simultaneously as they will
+    // both try to allocate a signal handler for SIGCHLD.
+    {
+        // Case 1: arguments present.
+        ProcessArgs args;
+        args.push_back("-x");
+        args.push_back("-y");
+        args.push_back("foo");
+        args.push_back("bar");
+        ProcessSpawn process(io_service_, TEST_SCRIPT_SH, args);
+        std::string expected = TEST_SCRIPT_SH;
+        expected += " -x -y foo bar";
+        EXPECT_EQ(expected, process.getCommandLine());
+    }
+
+    {
+        // Case 2: no arguments.
+        ProcessSpawn process(io_service_, TEST_SCRIPT_SH);
+        EXPECT_EQ(TEST_SCRIPT_SH, process.getCommandLine());
+    }
+}
+
+// This test verifies that it is possible to check if the process is
+// running.
+TEST_F(ProcessSpawnTest, isRunning) {
+    // Run the process which sleeps for 10 seconds, so as we have
+    // enough time to check if it is running.
+    vector<string> args;
+    args.push_back("-s");
+    args.push_back("10");
+
+    ProcessSpawn process(io_service_, TEST_SCRIPT_SH, args);
+    pid_t pid = 0;
+    ASSERT_NO_THROW(pid = process.spawn());
+
+    EXPECT_TRUE(process.isRunning(pid));
+
+    // Kill the process.
+    ASSERT_EQ(0, kill(pid, SIGKILL));
+
+    // Set test fail safe.
+    setTestTime(1000);
+
+    // The next handler executed is IOSignal's handler.
+    io_service_->run_one();
+
+    // The first handler executed is the IOSignal's internal timer expire
+    // callback.
+    io_service_->run_one();
+
+    // Polling once to be sure.
+    io_service_->poll();
+
+    ASSERT_EQ(1, processed_signals_.size());
+    ASSERT_EQ(SIGCHLD, processed_signals_[0]);
+}
+
+} // end of anonymous namespace
diff --git a/src/lib/asiolink/tests/run_unittests.cc b/src/lib/asiolink/tests/run_unittests.cc
new file mode 100644
index 0000000..566c7c9
--- /dev/null
+++ b/src/lib/asiolink/tests/run_unittests.cc
@@ -0,0 +1,19 @@
+// Copyright (C) 2009-2018 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <gtest/gtest.h>
+#include <util/unittests/run_all.h>
+#include <log/logger_manager.h>
+
+int
+main(int argc, char* argv[])
+{
+    ::testing::InitGoogleTest(&argc, argv);         // Initialize Google test
+    isc::log::LoggerManager::init("unittest");      // Set a root logger name
+    return (isc::util::unittests::run_all());
+}
diff --git a/src/lib/asiolink/tests/tcp_acceptor_unittest.cc b/src/lib/asiolink/tests/tcp_acceptor_unittest.cc
new file mode 100644
index 0000000..5a925cc
--- /dev/null
+++ b/src/lib/asiolink/tests/tcp_acceptor_unittest.cc
@@ -0,0 +1,444 @@
+// Copyright (C) 2016-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <asiolink/asio_wrapper.h>
+#include <asiolink/interval_timer.h>
+#include <asiolink/io_address.h>
+#include <asiolink/io_service.h>
+#include <asiolink/tcp_acceptor.h>
+#include <asiolink/tcp_endpoint.h>
+#include <boost/noncopyable.hpp>
+#include <boost/shared_ptr.hpp>
+#include <gtest/gtest.h>
+#include <functional>
+#include <list>
+#include <netinet/in.h>
+#include <string>
+
+using namespace isc::asiolink;
+namespace ph = std::placeholders;
+
+namespace {
+
+/// @brief Local server address used for testing.
+const char SERVER_ADDRESS[] = "127.0.0.1";
+
+/// @brief Local server port used for testing.
+const unsigned short SERVER_PORT = 18123;
+
+/// @brief Test timeout in ms.
+const long TEST_TIMEOUT = 10000;
+
+/// @brief Simple class representing TCP socket callback.
+class SocketCallback {
+public:
+
+    /// @brief Implements callback for the asynchronous operation on the socket.
+    ///
+    /// This callback merely checks if error has occurred and reports this
+    /// error. It does nothing in case of success.
+    ///
+    /// @param ec Error code.
+    /// @param length Length of received data.
+    void operator()(boost::system::error_code ec, size_t length = 0) {
+        if (ec) {
+            ADD_FAILURE() << "error occurred for a socket with data of length "
+                          << length << ": " << ec.message();
+        }
+    }
+
+};
+
+/// @brief Entity which can connect to the TCP server endpoint and close the
+/// connection.
+class TCPClient : public boost::noncopyable {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// This constructor creates new socket instance. It doesn't connect. Call
+    /// connect() to connect to the server.
+    ///
+    /// @param io_service IO service to be stopped on error.
+    explicit TCPClient(IOService& io_service)
+        : io_service_(io_service.get_io_service()), socket_(io_service_) {
+    }
+
+    /// @brief Destructor.
+    ///
+    /// Closes the underlying socket if it is open.
+    ~TCPClient() {
+        close();
+    }
+
+    /// @brief Connect to the test server address and port.
+    ///
+    /// This method asynchronously connects to the server endpoint and uses the
+    /// connectHandler as a callback function.
+    void connect() {
+        boost::asio::ip::tcp::endpoint
+            endpoint(boost::asio::ip::address::from_string(SERVER_ADDRESS),
+                     SERVER_PORT);
+        socket_.async_connect(endpoint,
+                              std::bind(&TCPClient::connectHandler, this,
+                                        ph::_1));
+    }
+
+    /// @brief Callback function for connect().
+    ///
+    /// This function stops the IO service upon error.
+    ///
+    /// @param ec Error code.
+    void connectHandler(const boost::system::error_code& ec) {
+        if (ec) {
+            // One would expect that async_connect wouldn't return EINPROGRESS
+            // error code, but simply wait for the connection to get
+            // established before the handler is invoked. It turns out, however,
+            // that on some OSes the connect handler may receive this error code
+            // which doesn't necessarily indicate a problem. Making an attempt
+            // to write and read from this socket will typically succeed. So,
+            // we ignore this error.
+            if (ec.value() != boost::asio::error::in_progress) {
+                ADD_FAILURE() << "error occurred while connecting: "
+                              << ec.message();
+                io_service_.stop();
+            }
+        }
+    }
+
+    /// @brief Close connection.
+    void close() {
+        socket_.close();
+    }
+
+private:
+
+    /// @brief Holds reference to the IO service.
+    boost::asio::io_service& io_service_;
+
+    /// @brief A socket used for the connection.
+    boost::asio::ip::tcp::socket socket_;
+
+};
+
+/// @brief Pointer to the TCPClient.
+typedef boost::shared_ptr<TCPClient> TCPClientPtr;
+
+/// @brief A signature of the function implementing callback for the
+/// TCPAcceptor.
+typedef std::function<void(const boost::system::error_code&)> TCPAcceptorCallback;
+
+/// @brief TCPAcceptor using TCPAcceptorCallback.
+typedef TCPAcceptor<TCPAcceptorCallback> TestTCPAcceptor;
+
+/// @brief Implements asynchronous TCP acceptor service.
+///
+/// It creates a new socket into which connection is accepted. The socket
+/// is retained until class instance exists.
+class Acceptor {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param io_service IO service.
+    /// @param acceptor Reference to the TCP acceptor on which asyncAccept
+    /// will be called.
+    /// @param callback Callback function for the asyncAccept.
+    explicit Acceptor(IOService& io_service, TestTCPAcceptor& acceptor,
+                      const TCPAcceptorCallback& callback)
+        : socket_(io_service), acceptor_(acceptor), callback_(callback) {
+    }
+
+    /// @brief Destructor.
+    ///
+    /// Closes socket.
+    ~Acceptor() {
+        socket_.close();
+    }
+
+    /// @brief Asynchronous accept new connection.
+    void accept() {
+        acceptor_.asyncAccept(socket_, callback_);
+    }
+
+    /// @brief Close connection.
+    void close() {
+        socket_.close();
+    }
+
+private:
+
+    /// @brief Socket into which connection is accepted.
+    TCPSocket<SocketCallback> socket_;
+
+    /// @brief Reference to the TCPAcceptor on which asyncAccept is called.
+    TestTCPAcceptor& acceptor_;
+
+    /// @brief Instance of the callback used for asyncAccept.
+    TCPAcceptorCallback callback_;
+
+};
+
+/// @brief Pointer to the Acceptor object.
+typedef boost::shared_ptr<Acceptor> AcceptorPtr;
+
+/// @brief Test fixture class for TCPAcceptor.
+///
+/// This class provides means for creating new TCP connections, i.e. simulates
+/// clients connecting to the servers via TCPAcceptor. It is possible to create
+/// multiple simultaneous connections, which are retained by the test fixture
+/// class and closed cleanly when the test fixture is destroyed.
+class TCPAcceptorTest : public ::testing::Test {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// Besides initializing class members it also sets the test timer to guard
+    /// against endlessly running IO service when TCP connections are
+    /// unsuccessful.
+    TCPAcceptorTest()
+        : io_service_(), acceptor_(io_service_),
+          asio_endpoint_(boost::asio::ip::address::from_string(SERVER_ADDRESS),
+                         SERVER_PORT),
+          endpoint_(asio_endpoint_), test_timer_(io_service_), connections_(),
+          clients_(), connections_num_(0), aborted_connections_num_(0),
+          max_connections_(1) {
+        test_timer_.setup(std::bind(&TCPAcceptorTest::timeoutHandler, this),
+                                    TEST_TIMEOUT, IntervalTimer::ONE_SHOT);
+    }
+
+    /// @brief Destructor.
+    virtual ~TCPAcceptorTest() {
+    }
+
+    /// @brief Specifies how many new connections are expected before the IO
+    /// service is stopped.
+    ///
+    /// @param max_connections Connections limit.
+    void setMaxConnections(const unsigned int max_connections) {
+        max_connections_ = max_connections;
+    }
+
+    /// @brief Create ASIO endpoint from the provided endpoint by retaining the
+    /// IP address and modifying the port.
+    ///
+    /// This convenience method is useful to create new endpoint from the
+    /// existing endpoint to test reusing IP address for multiple acceptors.
+    /// The returned endpoint has the same IP address but different port.
+    ///
+    /// @param endpoint Source endpoint.
+    ///
+    /// @return New endpoint with the port number increased by 1.
+    boost::asio::ip::tcp::endpoint
+    createSiblingEndpoint(const boost::asio::ip::tcp::endpoint& endpoint) const {
+        boost::asio::ip::tcp::endpoint endpoint_copy(endpoint);
+        endpoint_copy.port(endpoint.port() + 1);
+        return (endpoint_copy);
+    }
+
+    /// @brief Opens TCP acceptor and sets 'reuse address' option.
+    void acceptorOpen() {
+        acceptor_.open(endpoint_);
+        acceptor_.setOption(TestTCPAcceptor::ReuseAddress(true));
+    }
+
+    /// @brief Starts accepting TCP connections.
+    ///
+    /// This method creates new Acceptor instance and calls accept() to start
+    /// accepting new connections. The instance of the Acceptor object is
+    /// retained in the connections_ list.
+    void accept() {
+        TCPAcceptorCallback cb = std::bind(&TCPAcceptorTest::acceptHandler,
+                                           this, ph::_1);
+        AcceptorPtr conn(new Acceptor(io_service_, acceptor_, cb));
+        connections_.push_back(conn);
+        connections_.back()->accept();
+    }
+
+    /// @brief Connect to the endpoint.
+    ///
+    /// This method creates TCPClient instance and retains it in the clients_
+    /// list.
+    void connect() {
+        TCPClientPtr client(new TCPClient(io_service_));
+        clients_.push_back(client);
+        clients_.back()->connect();
+    }
+
+    /// @brief Callback function for asynchronous accept calls.
+    ///
+    /// It stops the IO service upon error or when the number of accepted
+    /// connections reaches the max_connections_ value. Otherwise it calls
+    /// accept() to start accepting next connections.
+    ///
+    /// @param ec Error code.
+    void acceptHandler(const boost::system::error_code& ec) {
+        if (ec) {
+            if (ec.value() != boost::asio::error::operation_aborted) {
+                ADD_FAILURE() << "error occurred while accepting connection: "
+                              << ec.message();
+            } else {
+                ++aborted_connections_num_;
+            }
+            io_service_.stop();
+        }
+
+        // We have reached the maximum number of connections - end the test.
+        if (++connections_num_ >= max_connections_) {
+            io_service_.stop();
+            return;
+        }
+
+        accept();
+    }
+
+    /// @brief Callback function invoke upon test timeout.
+    ///
+    /// It stops the IO service and reports test timeout.
+    void timeoutHandler() {
+        ADD_FAILURE() << "Timeout occurred while running the test!";
+        io_service_.stop();
+    }
+
+    /// @brief IO service.
+    IOService io_service_;
+
+    /// @brief TCPAcceptor under test.
+    TestTCPAcceptor acceptor_;
+
+    /// @brief Server endpoint.
+    boost::asio::ip::tcp::endpoint asio_endpoint_;
+
+    /// @brief asiolink server endpoint (uses asio_endpoint_).
+    TCPEndpoint endpoint_;
+
+    /// @brief Asynchronous timer service to detect timeouts.
+    IntervalTimer test_timer_;
+
+    /// @brief List of connections on the server side.
+    std::list<AcceptorPtr> connections_;
+
+    /// @brief List of client connections.
+    std::list<TCPClientPtr> clients_;
+
+    /// @brief Current number of established connections.
+    unsigned int connections_num_;
+
+    /// @brief Current number of aborted connections.
+    unsigned int aborted_connections_num_;
+
+    /// @brief Connections limit.
+    unsigned int max_connections_;
+};
+
+// Test TCPAcceptor::asyncAccept.
+TEST_F(TCPAcceptorTest, asyncAccept) {
+    // Establish up to 10 connections.
+    setMaxConnections(10);
+
+    // Initialize acceptor.
+    acceptorOpen();
+    acceptor_.bind(endpoint_);
+    acceptor_.listen();
+
+    // Start accepting new connections.
+    accept();
+
+    // Create 10 new TCP connections (client side).
+    for (unsigned int i = 0; i < 10; ++i) {
+        connect();
+    }
+
+    // Run the IO service until we have accepted 10 connections, an error
+    // or test timeout occurred.
+    io_service_.run();
+
+    // Make sure that all accepted connections have been recorded.
+    EXPECT_EQ(10, connections_num_);
+    EXPECT_EQ(10, connections_.size());
+}
+
+// Check that it is possible to set SO_REUSEADDR flag for the TCPAcceptor.
+TEST_F(TCPAcceptorTest, reuseAddress) {
+    // We need at least two acceptors using common address. Let's create the
+    // second endpoint which has the same address but different port.
+    boost::asio::ip::tcp::endpoint asio_endpoint2(createSiblingEndpoint(asio_endpoint_));
+    TCPEndpoint endpoint2(asio_endpoint2);
+
+    // Create and open two acceptors.
+    TestTCPAcceptor acceptor1(io_service_);
+    TestTCPAcceptor acceptor2(io_service_);
+    ASSERT_NO_THROW(acceptor1.open(endpoint_));
+    ASSERT_NO_THROW(acceptor2.open(endpoint2));
+
+    // Set SO_REUSEADDR socket option so as acceptors can bind to the
+    /// same address.
+    ASSERT_NO_THROW(
+        acceptor1.setOption(TestTCPAcceptor::ReuseAddress(true))
+    );
+    ASSERT_NO_THROW(
+        acceptor2.setOption(TestTCPAcceptor::ReuseAddress(true))
+    );
+    ASSERT_NO_THROW(acceptor1.bind(endpoint_));
+    ASSERT_NO_THROW(acceptor2.bind(endpoint2));
+
+    // Create third acceptor, but don't set the SO_REUSEADDR. It should
+    // refuse to bind.
+    TCPEndpoint endpoint3(createSiblingEndpoint(asio_endpoint2));
+    TestTCPAcceptor acceptor3(io_service_);
+    ASSERT_NO_THROW(acceptor3.open(endpoint3));
+    EXPECT_THROW(acceptor3.bind(endpoint_), boost::system::system_error);
+}
+
+// Test that TCPAcceptor::getProtocol returns IPPROTO_TCP.
+TEST_F(TCPAcceptorTest, getProtocol) {
+    EXPECT_EQ(IPPROTO_TCP, acceptor_.getProtocol());
+}
+
+// Test that TCPAcceptor::getNative returns valid socket descriptor.
+TEST_F(TCPAcceptorTest, getNative) {
+    // Initially the descriptor should be invalid (negative).
+    ASSERT_LT(acceptor_.getNative(), 0);
+    // Now open the socket and make sure the returned descriptor is now valid.
+    ASSERT_NO_THROW(acceptorOpen());
+    EXPECT_GE(acceptor_.getNative(), 0);
+}
+
+// macOS 10.12.3 has a bug which causes the connections to not enter
+// the TIME-WAIT state and they never get closed.
+#if !defined (OS_OSX)
+
+// Test that TCPAcceptor::close works properly.
+TEST_F(TCPAcceptorTest, close) {
+    // Initialize acceptor.
+    acceptorOpen();
+    acceptor_.bind(endpoint_);
+    acceptor_.listen();
+
+    // Start accepting new connections.
+    accept();
+
+    // Create 10 new TCP connections (client side).
+    for (unsigned int i = 0; i < 10; ++i) {
+        connect();
+    }
+
+    // Close the acceptor before connections are accepted.
+    acceptor_.close();
+
+    // Run the IO service.
+    io_service_.run();
+
+    // The connections should have been aborted.
+    EXPECT_EQ(1, connections_num_);
+    EXPECT_EQ(1, aborted_connections_num_);
+    EXPECT_EQ(1, connections_.size());
+}
+
+#endif
+
+}
diff --git a/src/lib/asiolink/tests/tcp_endpoint_unittest.cc b/src/lib/asiolink/tests/tcp_endpoint_unittest.cc
new file mode 100644
index 0000000..0d838d4
--- /dev/null
+++ b/src/lib/asiolink/tests/tcp_endpoint_unittest.cc
@@ -0,0 +1,46 @@
+// Copyright (C) 2011-2016 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <asiolink/asio_wrapper.h>
+#include <asiolink/io_address.h>
+#include <asiolink/tcp_endpoint.h>
+
+#include <gtest/gtest.h>
+
+#include <string>
+
+using namespace isc::asiolink;
+using namespace std;
+
+// This test checks that the endpoint can manage its own internal
+// boost::asio::ip::tcp::endpoint object.
+
+TEST(TCPEndpointTest, v4Address) {
+    const string test_address("192.0.2.1");
+    const unsigned short test_port = 5301;
+
+    IOAddress address(test_address);
+    TCPEndpoint endpoint(address, test_port);
+
+    EXPECT_TRUE(address == endpoint.getAddress());
+    EXPECT_EQ(test_port, endpoint.getPort());
+    EXPECT_EQ(static_cast<short>(IPPROTO_TCP), endpoint.getProtocol());
+    EXPECT_EQ(AF_INET, endpoint.getFamily());
+}
+
+TEST(TCPEndpointTest, v6Address) {
+    const string test_address("2001:db8::1235");
+    const unsigned short test_port = 5302;
+
+    IOAddress address(test_address);
+    TCPEndpoint endpoint(address, test_port);
+
+    EXPECT_TRUE(address == endpoint.getAddress());
+    EXPECT_EQ(test_port, endpoint.getPort());
+    EXPECT_EQ(static_cast<short>(IPPROTO_TCP), endpoint.getProtocol());
+    EXPECT_EQ(AF_INET6, endpoint.getFamily());
+}
diff --git a/src/lib/asiolink/tests/tcp_socket_unittest.cc b/src/lib/asiolink/tests/tcp_socket_unittest.cc
new file mode 100644
index 0000000..7531af6
--- /dev/null
+++ b/src/lib/asiolink/tests/tcp_socket_unittest.cc
@@ -0,0 +1,515 @@
+// Copyright (C) 2011-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+/// @brief Test of TCPSocket
+///
+/// Tests the functionality of a TCPSocket by working through an open-send-
+/// receive-close sequence and checking that the asynchronous notifications
+/// work.
+
+#include <config.h>
+#include <asiolink/asio_wrapper.h>
+#include <asiolink/io_service.h>
+#include <asiolink/tcp_endpoint.h>
+#include <asiolink/tcp_socket.h>
+#include <util/buffer.h>
+#include <util/io_utilities.h>
+
+#include <boost/shared_ptr.hpp>
+#include <gtest/gtest.h>
+
+#include <algorithm>
+#include <arpa/inet.h>
+#include <cstddef>
+#include <cstdlib>
+#include <errno.h>
+#include <netinet/in.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <string>
+#include <vector>
+
+using namespace boost::asio;
+using namespace boost::asio::ip;
+using namespace isc::util;
+using namespace isc::asiolink;
+using namespace std;
+
+namespace {
+
+const char SERVER_ADDRESS[] = "127.0.0.1";
+const unsigned short SERVER_PORT = 5303;
+
+/// @todo Shouldn't we send something that is real message?
+const char OUTBOUND_DATA[] = "Data sent from client to server";
+const char INBOUND_DATA[] = "Returned data from server to client";
+}
+
+/// An instance of this object is passed to the asynchronous I/O functions
+/// and the operator() method is called when when an asynchronous I/O completes.
+/// The arguments to the completion callback are stored for later retrieval.
+class TCPCallback {
+public:
+    /// @brief Operations the server is doing
+    enum Operation {
+        ACCEPT = 0,     ///< accept() was issued
+        OPEN = 1,       /// Client connected to server
+        READ = 2,       ///< Asynchronous read completed
+        WRITE = 3,      ///< Asynchronous write completed
+        NONE = 4        ///< "Not set" state
+    };
+
+    /// @brief Minimum size of buffers
+    enum {
+        MIN_SIZE = (64 * 1024 + 2)          ///< 64kB + two bytes for a count
+    };
+
+    struct PrivateData {
+        PrivateData() :
+            error_code_(), length_(0), cumulative_(0), expected_(0), offset_(0),
+            name_(""), queued_(NONE), called_(NONE), data_(MIN_SIZE, 0)
+        {}
+
+        boost::system::error_code  error_code_;    ///< Completion error code
+        size_t                     length_;        ///< Bytes transferred in this I/O
+        size_t                     cumulative_;    ///< Cumulative bytes transferred
+        size_t                     expected_;      ///< Expected amount of data
+        size_t                     offset_;        ///< Where to put data in buffer
+        std::string                name_;          ///< Which of the objects this is
+        Operation                  queued_;        ///< Queued operation
+        Operation                  called_;        ///< Which callback called
+        std::vector<uint8_t>       data_;          ///< Receive buffer
+    };
+
+    /// @brief Constructor
+    ///
+    /// Constructs the object.  It also creates the data member pointed to by
+    /// a shared pointer.  When used as a callback object, this is copied as it
+    /// is passed into the asynchronous function.  This means that there are two
+    /// objects and inspecting the one we passed in does not tell us anything.
+    ///
+    /// Therefore we use a boost::shared_ptr.  When the object is copied, the
+    /// shared pointer is copied, which leaves both objects pointing to the same
+    /// data.
+    ///
+    /// @param which Which of the two callback objects this is
+    TCPCallback(std::string which) : ptr_(new PrivateData())
+    {
+        ptr_->name_ = which;
+    }
+
+    /// @brief Destructor
+    ///
+    /// No code needed, destroying the shared pointer destroys the private data.
+    virtual ~TCPCallback()
+    {}
+
+    /// @brief Client Callback Function
+    ///
+    /// Called when an asynchronous operation is completed by the client, this
+    /// stores the origin of the operation in the client_called_ data member.
+    ///
+    /// @param ec I/O completion error code passed to callback function.
+    /// @param length Number of bytes transferred
+    void operator()(boost::system::error_code ec = boost::system::error_code(),
+                            size_t length = 0)
+    {
+        setCode(ec.value());
+        ptr_->called_ = ptr_->queued_;
+        ptr_->length_ = length;
+    }
+
+    /// @brief Get I/O completion error code
+    int getCode() {
+        return (ptr_->error_code_.value());
+    }
+
+    /// @brief Set I/O completion code
+    ///
+    /// @param code New value of completion code
+    void setCode(int code) {
+        ptr_->error_code_ = boost::system::error_code(code, boost::system::error_code().category());
+    }
+
+    /// @brief Get number of bytes transferred in I/O
+    size_t& length() {
+        return (ptr_->length_);
+    }
+
+    /// @brief Get cumulative number of bytes transferred in I/O
+    size_t& cumulative() {
+        return (ptr_->cumulative_);
+    }
+
+    /// @brief Get expected amount of data
+    size_t& expected() {
+        return (ptr_->expected_);
+    }
+
+    /// @brief Get offset into data
+    size_t& offset() {
+        return (ptr_->offset_);
+    }
+
+    /// @brief Get data member
+    uint8_t* data() {
+        return (&ptr_->data_[0]);
+    }
+
+    /// @brief Get flag to say what was queued
+    Operation& queued() {
+        return (ptr_->queued_);
+    }
+
+    /// @brief Get flag to say when callback was called
+    Operation& called() {
+        return (ptr_->called_);
+    }
+
+    /// @brief Return instance of callback name
+    std::string& name() {
+        return (ptr_->name_);
+    }
+
+private:
+    boost::shared_ptr<PrivateData>  ptr_;   ///< Pointer to private data
+};
+
+
+// Read Server Data
+//
+// Called in the part of the test that has the client send a message to the
+// server, this loops until all the data has been read (synchronously) by the
+// server.
+//
+// "All the data read" means that the server has received a message that is
+// preceded by a two-byte count field and that the total amount of data received
+// from the remote end is equal to the value in the count field plus two bytes
+// for the count field itself.
+//
+// @param socket Socket on which the server is reading data
+// @param server_cb Structure in which server data is held.
+void
+serverRead(tcp::socket& socket, TCPCallback& server_cb) {
+
+    // As we may need to read multiple times, keep a count of the cumulative
+    // amount of data read and do successive reads into the appropriate part
+    // of the buffer.
+    //
+    // Note that there are no checks for buffer overflow - this is a test
+    // program and we have sized the buffer to be large enough for the test.
+    server_cb.cumulative() = 0;
+
+    bool complete = false;
+    while (!complete) {
+
+        // Read block of data and update cumulative amount of data received.
+        server_cb.length() = socket.receive(
+            boost::asio::buffer(server_cb.data() + server_cb.cumulative(),
+                TCPCallback::MIN_SIZE - server_cb.cumulative()));
+        server_cb.cumulative() += server_cb.length();
+
+        // If we have read at least two bytes, we can work out how much we
+        // should be reading.
+        if (server_cb.cumulative() >= 2) {
+            server_cb.expected() = readUint16(server_cb.data(), server_cb.length());
+            if ((server_cb.expected() + 2) == server_cb.cumulative()) {
+
+                // Amount of data read from socket equals the size of the
+                // message (as indicated in the first two bytes of the message)
+                // plus the size of the count field.  Therefore we have received
+                // all the data.
+                complete = true;
+            }
+        }
+    }
+}
+
+// Receive complete method should return true only if the count in the first
+// two bytes is equal to the size of the rest if the buffer.
+
+TEST(TCPSocket, processReceivedData) {
+    const uint16_t PACKET_SIZE = 16382;     // Amount of "real" data in the buffer
+
+    IOService               service;        // Used to instantiate socket
+    TCPSocket<TCPCallback>  test(service);  // Socket under test
+    uint8_t                 inbuff[PACKET_SIZE + 2];   // Buffer to check
+    OutputBufferPtr         outbuff(new OutputBuffer(16));
+                                            // Where data is put
+    size_t                  expected;       // Expected amount of data
+    size_t                  offset;         // Where to put next data
+    size_t                  cumulative;     // Cumulative data received
+
+    // Set some dummy values in the buffer to check
+    for (size_t i = 0; i < sizeof(inbuff); ++i) {
+        inbuff[i] = i % 256;
+    }
+
+    // Check that the method will handle various receive sizes.
+    writeUint16(PACKET_SIZE, inbuff, sizeof(inbuff));
+
+    cumulative = 0;
+    offset = 0;
+    expected = 0;
+    outbuff->clear();
+    bool complete = test.processReceivedData(inbuff, 1, cumulative, offset,
+                                             expected, outbuff);
+    EXPECT_FALSE(complete);
+    EXPECT_EQ(1, cumulative);
+    EXPECT_EQ(1, offset);
+    EXPECT_EQ(0, expected);
+    EXPECT_EQ(0, outbuff->getLength());
+
+    // Now pretend that we've received one more byte.
+    complete = test.processReceivedData(inbuff, 1, cumulative, offset, expected,
+                                        outbuff);
+    EXPECT_FALSE(complete);
+    EXPECT_EQ(2, cumulative);
+    EXPECT_EQ(0, offset);
+    EXPECT_EQ(PACKET_SIZE, expected);
+    EXPECT_EQ(0, outbuff->getLength());
+
+    // Add another two bytes.  However, this time note that we have to offset
+    // in the input buffer because it is expected that the next chunk of data
+    // from the connection will be read into the start of the buffer.
+    complete = test.processReceivedData(inbuff + cumulative, 2, cumulative,
+                                        offset, expected, outbuff);
+    EXPECT_FALSE(complete);
+    EXPECT_EQ(4, cumulative);
+    EXPECT_EQ(0, offset);
+    EXPECT_EQ(PACKET_SIZE, expected);
+    EXPECT_EQ(2, outbuff->getLength());
+
+    const uint8_t* dataptr = static_cast<const uint8_t*>(outbuff->getData());
+    EXPECT_TRUE(equal(inbuff + 2, inbuff + cumulative, dataptr));
+
+    // And add the remaining data.  Remember that "inbuff" is "PACKET_SIZE + 2"
+    // long.
+    complete = test.processReceivedData(inbuff + cumulative,
+                                        PACKET_SIZE + 2 - cumulative,
+                                        cumulative, offset, expected, outbuff);
+    EXPECT_TRUE(complete);
+    EXPECT_EQ(PACKET_SIZE + 2, cumulative);
+    EXPECT_EQ(0, offset);
+    EXPECT_EQ(PACKET_SIZE, expected);
+    EXPECT_EQ(PACKET_SIZE, outbuff->getLength());
+    dataptr = static_cast<const uint8_t*>(outbuff->getData());
+    EXPECT_TRUE(equal(inbuff + 2, inbuff + cumulative, dataptr));
+}
+
+/// @todo Need to add a test to check the cancel() method
+
+// Tests the operation of a TCPSocket by opening it, sending an asynchronous
+// message to a server, receiving an asynchronous message from the server and
+// closing.
+TEST(TCPSocket, sequenceTest) {
+
+    // Common objects.
+    IOService   service;                    // Service object for async control
+
+    // The client - the TCPSocket being tested
+    TCPSocket<TCPCallback>  client(service);// Socket under test
+    TCPCallback client_cb("Client");        // Async I/O callback function
+    TCPEndpoint client_remote_endpoint;     // Where client receives message from
+    OutputBufferPtr client_buffer(new OutputBuffer(128));
+                                            // Received data is put here
+
+    // The server - with which the client communicates.
+    IOAddress   server_address(SERVER_ADDRESS);
+                                            // Address of target server
+    TCPCallback server_cb("Server");        // Server callback
+    TCPEndpoint server_endpoint(server_address, SERVER_PORT);
+                                            // Endpoint describing server
+    TCPEndpoint server_remote_endpoint;     // Address where server received message from
+    tcp::socket server_socket(service.get_io_service());
+                                            // Socket used for server
+
+    // Step 1.  Create the connection between the client and the server.  Set
+    // up the server to accept incoming connections and have the client open
+    // a channel to it.
+
+    // Set up server - open socket and queue an accept.
+    server_cb.queued() = TCPCallback::ACCEPT;
+    server_cb.called() = TCPCallback::NONE;
+    server_cb.setCode(42);  // Some error
+    tcp::acceptor acceptor(service.get_io_service(),
+                            tcp::endpoint(tcp::v4(), SERVER_PORT));
+    acceptor.set_option(tcp::acceptor::reuse_address(true));
+    acceptor.async_accept(server_socket, server_cb);
+
+    // Set up client - connect to the server.
+    client_cb.queued() = TCPCallback::OPEN;
+    client_cb.called() = TCPCallback::NONE;
+    client_cb.setCode(43);  // Some error
+    EXPECT_FALSE(client.isOpenSynchronous());
+    client.open(&server_endpoint, client_cb);
+
+    // Run the open and the accept callback and check that they ran.
+    service.run_one();
+    service.run_one();
+
+    EXPECT_EQ(TCPCallback::ACCEPT, server_cb.called());
+    EXPECT_EQ(0, server_cb.getCode());
+
+    EXPECT_EQ(TCPCallback::OPEN, client_cb.called());
+
+    // On some operating system the async_connect may return EINPROGRESS.
+    // This doesn't necessarily indicate an error. In most cases trying
+    // to asynchronously write and read from the socket would work just
+    // fine.
+    if ((client_cb.getCode()) != 0 && (client_cb.getCode() != EINPROGRESS)) {
+        ADD_FAILURE() << "expected error code of 0 or " << EINPROGRESS
+            << " as a result of async_connect, got " << client_cb.getCode();
+    }
+
+    // Step 2.  Get the client to write to the server asynchronously.  The
+    // server will loop reading the data synchronously.
+
+    // Write asynchronously to the server.
+    client_cb.called() = TCPCallback::NONE;
+    client_cb.queued() = TCPCallback::WRITE;
+    client_cb.setCode(143);  // Arbitrary number
+    client_cb.length() = 0;
+    client.asyncSend(OUTBOUND_DATA, sizeof(OUTBOUND_DATA), &server_endpoint, client_cb);
+
+    // Wait for the client callback to complete. (Must do this first on
+    // Solaris: if we do the synchronous read first, the test hangs.)
+    service.run_one();
+
+    // Synchronously read the data from the server.;
+    serverRead(server_socket, server_cb);
+
+    // Check the client state
+    EXPECT_EQ(TCPCallback::WRITE, client_cb.called());
+    EXPECT_EQ(0, client_cb.getCode());
+    EXPECT_EQ(sizeof(OUTBOUND_DATA) + 2, client_cb.length());
+
+    // ... and check what the server received.
+    EXPECT_EQ(sizeof(OUTBOUND_DATA) + 2, server_cb.cumulative());
+    EXPECT_TRUE(equal(OUTBOUND_DATA,
+                (OUTBOUND_DATA + (sizeof(OUTBOUND_DATA) - 1)),
+                (server_cb.data() + 2)));
+
+    // Step 3.  Get the server to write all the data asynchronously and have the
+    // client loop (asynchronously) reading the data.  Note that we copy the
+    // data into the server's internal buffer in order to precede it with a two-
+    // byte count field.
+
+    // Have the server write asynchronously to the client.
+    server_cb.called() = TCPCallback::NONE;
+    server_cb.queued() = TCPCallback::WRITE;
+    server_cb.length() = 0;
+    server_cb.cumulative() = 0;
+
+    writeUint16(sizeof(INBOUND_DATA), server_cb.data(), TCPCallback::MIN_SIZE);
+    copy(INBOUND_DATA, (INBOUND_DATA + sizeof(INBOUND_DATA) - 1),
+        (server_cb.data() + 2));
+    server_socket.async_send(boost::asio::buffer(server_cb.data(),
+                                          (sizeof(INBOUND_DATA) + 2)),
+                             server_cb);
+
+    // Have the client read asynchronously.
+    client_cb.called() = TCPCallback::NONE;
+    client_cb.queued() = TCPCallback::READ;
+    client_cb.length() = 0;
+    client_cb.cumulative() = 0;
+    client_cb.expected() = 0;
+    client_cb.offset() = 0;
+
+    client.asyncReceive(client_cb.data(), TCPCallback::MIN_SIZE,
+                        client_cb.offset(), &client_remote_endpoint,
+                        client_cb);
+
+    // Run the callbacks. Several options are possible depending on how ASIO
+    // is implemented and whether the message gets fragmented:
+    //
+    // 1) The send handler may complete immediately, regardless of whether the
+    // data has been read by the client.  (This is the most likely.)
+    // 2) The send handler may only run after all the data has been read by
+    // the client. (This could happen if the client's TCP buffers were too
+    // small so the data was not transferred to the "remote" system until the
+    // remote buffer has been emptied one or more times.)
+    // 3) The client handler may be run a number of times to handle the message
+    // fragments and the server handler may run between calls of the client
+    // handler.
+    //
+    // So loop, running one handler at a time until we are certain that all the
+    // handlers have run.
+
+    bool server_complete = false;
+    bool client_complete = false;
+    while (!server_complete || !client_complete) {
+        service.run_one();
+
+        // Has the server run?
+        if (!server_complete) {
+            if (server_cb.called() == server_cb.queued()) {
+
+                // Yes.  Check that the send completed successfully and that
+                // all the data that was expected to have been sent was in fact
+                // sent.
+                EXPECT_EQ(0, server_cb.getCode());
+                EXPECT_EQ((sizeof(INBOUND_DATA) + 2), server_cb.length());
+                server_complete = true;
+            }
+        }
+
+        // Has the client run?
+        if (!client_complete) {
+
+            if (client_cb.called() != client_cb.queued()) {
+                // No. Run the service another time.
+                continue;
+            }
+
+            // Client callback must have run.  Check that it ran OK.
+            EXPECT_EQ(TCPCallback::READ, client_cb.called());
+            EXPECT_EQ(0, client_cb.getCode());
+
+            // Check if we need to queue another read, copying the data into
+            // the output buffer as we do so.
+            client_complete = client.processReceivedData(client_cb.data(),
+                                                         client_cb.length(),
+                                                         client_cb.cumulative(),
+                                                         client_cb.offset(),
+                                                         client_cb.expected(),
+                                                         client_buffer);
+
+            // If the data is not complete, queue another read.
+            if (! client_complete) {
+                client_cb.called() = TCPCallback::NONE;
+                client_cb.queued() = TCPCallback::READ;
+                client_cb.length() = 0;
+                client.asyncReceive(client_cb.data(), TCPCallback::MIN_SIZE ,
+                                    client_cb.offset(), &client_remote_endpoint,
+                                    client_cb);
+            }
+        }
+    }
+
+    // Both the send and the receive have completed.  Check that the received
+    // is what was sent.
+
+    // Check the client state
+    EXPECT_EQ(TCPCallback::READ, client_cb.called());
+    EXPECT_EQ(0, client_cb.getCode());
+    EXPECT_EQ(sizeof(INBOUND_DATA) + 2, client_cb.cumulative());
+    EXPECT_EQ(sizeof(INBOUND_DATA), client_buffer->getLength());
+
+    // ... and check what the server sent.
+    EXPECT_EQ(TCPCallback::WRITE, server_cb.called());
+    EXPECT_EQ(0, server_cb.getCode());
+    EXPECT_EQ(sizeof(INBOUND_DATA) + 2, server_cb.length());
+
+    // ... and that what was sent is what was received.
+    const uint8_t* received = static_cast<const uint8_t*>(client_buffer->getData());
+    EXPECT_TRUE(equal(INBOUND_DATA, (INBOUND_DATA + (sizeof(INBOUND_DATA) - 1)),
+                      received));
+
+    // Close client and server.
+    EXPECT_NO_THROW(client.close());
+    EXPECT_NO_THROW(server_socket.close());
+}
diff --git a/src/lib/asiolink/tests/tls_acceptor_unittest.cc b/src/lib/asiolink/tests/tls_acceptor_unittest.cc
new file mode 100644
index 0000000..d9d9ccd
--- /dev/null
+++ b/src/lib/asiolink/tests/tls_acceptor_unittest.cc
@@ -0,0 +1,450 @@
+// Copyright (C) 2016-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <asiolink/asio_wrapper.h>
+#include <asiolink/interval_timer.h>
+#include <asiolink/io_address.h>
+#include <asiolink/io_service.h>
+#include <asiolink/tcp_endpoint.h>
+#include <asiolink/tls_acceptor.h>
+#include <boost/noncopyable.hpp>
+#include <boost/shared_ptr.hpp>
+#include <gtest/gtest.h>
+#include <functional>
+#include <list>
+#include <netinet/in.h>
+#include <string>
+
+using namespace isc::asiolink;
+using namespace boost::asio;
+namespace ph = std::placeholders;
+
+namespace {
+
+/// @brief Local server address used for testing.
+const char SERVER_ADDRESS[] = "127.0.0.1";
+
+/// @brief Local server port used for testing.
+const unsigned short SERVER_PORT = 18123;
+
+/// @brief Test timeout in ms.
+const long TEST_TIMEOUT = 10000;
+
+/// @brief Simple class representing TCP socket callback.
+class SocketCallback {
+public:
+
+    /// @brief Implements callback for the asynchronous operation on the socket.
+    ///
+    /// This callback merely checks if error has occurred and reports this
+    /// error. It does nothing in case of success.
+    ///
+    /// @param ec Error code.
+    /// @param length Length of received data.
+    void operator()(boost::system::error_code ec, size_t length = 0) {
+        if (ec) {
+            ADD_FAILURE() << "error occurred for a socket with data of length "
+                          << length << ": " << ec.message();
+        }
+    }
+
+};
+
+/// @brief Entity which can connect to the TLS server endpoint and close the
+/// connection.
+class TLSClient : public boost::noncopyable {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// This constructor creates new socket instance. It doesn't connect. Call
+    /// connect() to connect to the server.
+    ///
+    /// @param io_service IO service to be stopped on error.
+    explicit TLSClient(IOService& io_service)
+        : io_service_(io_service.get_io_service()), socket_(io_service_) {
+    }
+
+    /// @brief Destructor.
+    ///
+    /// Closes the underlying socket if it is open.
+    ~TLSClient() {
+        close();
+    }
+
+    /// @brief Connect to the test server address and port.
+    ///
+    /// This method asynchronously connects to the server endpoint and uses the
+    /// connectHandler as a callback function.
+    void connect() {
+        ip::tcp::endpoint
+            endpoint(ip::address::from_string(SERVER_ADDRESS),
+                     SERVER_PORT);
+        socket_.async_connect(endpoint,
+                              std::bind(&TLSClient::connectHandler, this,
+                                        ph::_1));
+    }
+
+    /// @brief Callback function for connect().
+    ///
+    /// This function stops the IO service upon error.
+    ///
+    /// @param ec Error code.
+    void connectHandler(const boost::system::error_code& ec) {
+        if (ec) {
+            // One would expect that async_connect wouldn't return EINPROGRESS
+            // error code, but simply wait for the connection to get
+            // established before the handler is invoked. It turns out, however,
+            // that on some OSes the connect handler may receive this error code
+            // which doesn't necessarily indicate a problem. Making an attempt
+            // to write and read from this socket will typically succeed. So,
+            // we ignore this error.
+            if (ec.value() != error::in_progress) {
+                ADD_FAILURE() << "error occurred while connecting: "
+                              << ec.message();
+                io_service_.stop();
+            }
+        }
+    }
+
+    /// @brief Close connection.
+    void close() {
+        socket_.close();
+    }
+
+private:
+
+    /// @brief Holds reference to the IO service.
+    io_service& io_service_;
+
+    /// @brief A socket used for the connection.
+    ip::tcp::socket socket_;
+
+};
+
+/// @brief Pointer to the TLSClient.
+typedef boost::shared_ptr<TLSClient> TLSClientPtr;
+
+/// @brief A signature of the function implementing callback for the
+/// TLSAcceptor.
+typedef std::function<void(const boost::system::error_code&)> TLSAcceptorCallback;
+
+/// @brief TLSAcceptor using TLSAcceptorCallback.
+typedef TLSAcceptor<TLSAcceptorCallback> TestTLSAcceptor;
+
+/// @brief Implements asynchronous TLS acceptor service.
+///
+/// It creates a new socket into which connection is accepted. The socket
+/// is retained until class instance exists.
+class Acceptor {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param io_service IO service.
+    /// @param context Pointer to TLS context.
+    /// @param acceptor Reference to the TLS acceptor on which asyncAccept
+    /// will be called.
+    /// @param callback Callback function for the asyncAccept.
+    explicit Acceptor(IOService& io_service,
+                      TlsContextPtr context,
+                      TestTLSAcceptor& acceptor,
+                      const TLSAcceptorCallback& callback)
+        : socket_(io_service, context), acceptor_(acceptor),
+          callback_(callback) {
+    }
+
+    /// @brief Destructor.
+    ///
+    /// Closes socket.
+    ~Acceptor() {
+        socket_.close();
+    }
+
+    /// @brief Asynchronous accept new connection.
+    void accept() {
+        acceptor_.asyncAccept(socket_, callback_);
+    }
+
+    /// @brief Close connection.
+    void close() {
+        socket_.close();
+    }
+
+private:
+
+    /// @brief Socket into which connection is accepted.
+    TLSSocket<SocketCallback> socket_;
+
+    /// @brief Reference to the TLSAcceptor on which asyncAccept is called.
+    TestTLSAcceptor& acceptor_;
+
+    /// @brief Instance of the callback used for asyncAccept.
+    TLSAcceptorCallback callback_;
+
+};
+
+/// @brief Pointer to the Acceptor object.
+typedef boost::shared_ptr<Acceptor> AcceptorPtr;
+
+/// @brief Test fixture class for TLSAcceptor.
+///
+/// This class provides means for creating new TLS connections, i.e. simulates
+/// clients connecting to the servers via TLSAcceptor. It is possible to create
+/// multiple simultaneous connections, which are retained by the test fixture
+/// class and closed cleanly when the test fixture is destroyed.
+class TLSAcceptorTest : public ::testing::Test {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// Besides initializing class members it also sets the test timer to guard
+    /// against endlessly running IO service when TLS connections are
+    /// unsuccessful.
+    TLSAcceptorTest()
+        : io_service_(), acceptor_(io_service_),
+          asio_endpoint_(ip::address::from_string(SERVER_ADDRESS),
+                         SERVER_PORT),
+          endpoint_(asio_endpoint_), test_timer_(io_service_), connections_(),
+          clients_(), connections_num_(0), aborted_connections_num_(0),
+          max_connections_(1) {
+        test_timer_.setup(std::bind(&TLSAcceptorTest::timeoutHandler, this),
+                                    TEST_TIMEOUT, IntervalTimer::ONE_SHOT);
+    }
+
+    /// @brief Destructor.
+    virtual ~TLSAcceptorTest() {
+    }
+
+    /// @brief Specifies how many new connections are expected before the IO
+    /// service is stopped.
+    ///
+    /// @param max_connections Connections limit.
+    void setMaxConnections(const unsigned int max_connections) {
+        max_connections_ = max_connections;
+    }
+
+    /// @brief Create ASIO endpoint from the provided endpoint by retaining the
+    /// IP address and modifying the port.
+    ///
+    /// This convenience method is useful to create new endpoint from the
+    /// existing endpoint to test reusing IP address for multiple acceptors.
+    /// The returned endpoint has the same IP address but different port.
+    ///
+    /// @param endpoint Source endpoint.
+    ///
+    /// @return New endpoint with the port number increased by 1.
+    ip::tcp::endpoint
+    createSiblingEndpoint(const ip::tcp::endpoint& endpoint) const {
+        ip::tcp::endpoint endpoint_copy(endpoint);
+        endpoint_copy.port(endpoint.port() + 1);
+        return (endpoint_copy);
+    }
+
+    /// @brief Opens TLS acceptor and sets 'reuse address' option.
+    void acceptorOpen() {
+        acceptor_.open(endpoint_);
+        acceptor_.setOption(TestTLSAcceptor::ReuseAddress(true));
+    }
+
+    /// @brief Starts accepting TLS connections.
+    ///
+    /// This method creates new Acceptor instance and calls accept() to start
+    /// accepting new connections. The instance of the Acceptor object is
+    /// retained in the connections_ list.
+    void accept() {
+        TLSAcceptorCallback cb = std::bind(&TLSAcceptorTest::acceptHandler,
+                                           this, ph::_1);
+        TlsContextPtr ctx(new TlsContext(SERVER));
+        AcceptorPtr conn(new Acceptor(io_service_, ctx, acceptor_, cb));
+        connections_.push_back(conn);
+        connections_.back()->accept();
+    }
+
+    /// @brief Connect to the endpoint.
+    ///
+    /// This method creates TLSClient instance and retains it in the clients_
+    /// list.
+    void connect() {
+        TLSClientPtr client(new TLSClient(io_service_));
+        clients_.push_back(client);
+        clients_.back()->connect();
+    }
+
+    /// @brief Callback function for asynchronous accept calls.
+    ///
+    /// It stops the IO service upon error or when the number of accepted
+    /// connections reaches the max_connections_ value. Otherwise it calls
+    /// accept() to start accepting next connections.
+    ///
+    /// @param ec Error code.
+    void acceptHandler(const boost::system::error_code& ec) {
+        if (ec) {
+            if (ec.value() != error::operation_aborted) {
+                ADD_FAILURE() << "error occurred while accepting connection: "
+                              << ec.message();
+            } else {
+                ++aborted_connections_num_;
+            }
+            io_service_.stop();
+        }
+
+        // We have reached the maximum number of connections - end the test.
+        if (++connections_num_ >= max_connections_) {
+            io_service_.stop();
+            return;
+        }
+
+        accept();
+    }
+
+    /// @brief Callback function invoke upon test timeout.
+    ///
+    /// It stops the IO service and reports test timeout.
+    void timeoutHandler() {
+        ADD_FAILURE() << "Timeout occurred while running the test!";
+        io_service_.stop();
+    }
+
+    /// @brief IO service.
+    IOService io_service_;
+
+    /// @brief TLSAcceptor under test.
+    TestTLSAcceptor acceptor_;
+
+    /// @brief Server endpoint.
+    ip::tcp::endpoint asio_endpoint_;
+
+    /// @brief asiolink server endpoint (uses asio_endpoint_).
+    TCPEndpoint endpoint_;
+
+    /// @brief Asynchronous timer service to detect timeouts.
+    IntervalTimer test_timer_;
+
+    /// @brief List of connections on the server side.
+    std::list<AcceptorPtr> connections_;
+
+    /// @brief List of client connections.
+    std::list<TLSClientPtr> clients_;
+
+    /// @brief Current number of established connections.
+    unsigned int connections_num_;
+
+    /// @brief Current number of aborted connections.
+    unsigned int aborted_connections_num_;
+
+    /// @brief Connections limit.
+    unsigned int max_connections_;
+};
+
+// Test TLSAcceptor::asyncAccept.
+TEST_F(TLSAcceptorTest, asyncAccept) {
+    // Establish up to 10 connections.
+    setMaxConnections(10);
+
+    // Initialize acceptor.
+    acceptorOpen();
+    acceptor_.bind(endpoint_);
+    acceptor_.listen();
+
+    // Start accepting new connections.
+    accept();
+
+    // Create 10 new TLS connections (client side).
+    for (unsigned int i = 0; i < 10; ++i) {
+        connect();
+    }
+
+    // Run the IO service until we have accepted 10 connections, an error
+    // or test timeout occurred.
+    io_service_.run();
+
+    // Make sure that all accepted connections have been recorded.
+    EXPECT_EQ(10, connections_num_);
+    EXPECT_EQ(10, connections_.size());
+}
+
+// Check that it is possible to set SO_REUSEADDR flag for the TLSAcceptor.
+TEST_F(TLSAcceptorTest, reuseAddress) {
+    // We need at least two acceptors using common address. Let's create the
+    // second endpoint which has the same address but different port.
+    ip::tcp::endpoint asio_endpoint2(createSiblingEndpoint(asio_endpoint_));
+    TCPEndpoint endpoint2(asio_endpoint2);
+
+    // Create and open two acceptors.
+    TestTLSAcceptor acceptor1(io_service_);
+    TestTLSAcceptor acceptor2(io_service_);
+    ASSERT_NO_THROW(acceptor1.open(endpoint_));
+    ASSERT_NO_THROW(acceptor2.open(endpoint2));
+
+    // Set SO_REUSEADDR socket option so as acceptors can bind to the
+    /// same address.
+    ASSERT_NO_THROW(
+        acceptor1.setOption(TestTLSAcceptor::ReuseAddress(true))
+    );
+    ASSERT_NO_THROW(
+        acceptor2.setOption(TestTLSAcceptor::ReuseAddress(true))
+    );
+    ASSERT_NO_THROW(acceptor1.bind(endpoint_));
+    ASSERT_NO_THROW(acceptor2.bind(endpoint2));
+
+    // Create third acceptor, but don't set the SO_REUSEADDR. It should
+    // refuse to bind.
+    TCPEndpoint endpoint3(createSiblingEndpoint(asio_endpoint2));
+    TestTLSAcceptor acceptor3(io_service_);
+    ASSERT_NO_THROW(acceptor3.open(endpoint3));
+    EXPECT_THROW(acceptor3.bind(endpoint_), boost::system::system_error);
+}
+
+// Test that TLSAcceptor::getProtocol returns IPPROTO_TCP.
+TEST_F(TLSAcceptorTest, getProtocol) {
+    EXPECT_EQ(IPPROTO_TCP, acceptor_.getProtocol());
+}
+
+// Test that TLSAcceptor::getNative returns valid socket descriptor.
+TEST_F(TLSAcceptorTest, getNative) {
+    // Initially the descriptor should be invalid (negative).
+    ASSERT_LT(acceptor_.getNative(), 0);
+    // Now open the socket and make sure the returned descriptor is now valid.
+    ASSERT_NO_THROW(acceptorOpen());
+    EXPECT_GE(acceptor_.getNative(), 0);
+}
+
+// macOS 10.12.3 has a bug which causes the connections to not enter
+// the TIME-WAIT state and they never get closed.
+#if !defined (OS_OSX)
+
+// Test that TLSAcceptor::close works properly.
+TEST_F(TLSAcceptorTest, close) {
+    // Initialize acceptor.
+    acceptorOpen();
+    acceptor_.bind(endpoint_);
+    acceptor_.listen();
+
+    // Start accepting new connections.
+    accept();
+
+    // Create 10 new TLS connections (client side).
+    for (unsigned int i = 0; i < 10; ++i) {
+        connect();
+    }
+
+    // Close the acceptor before connections are accepted.
+    acceptor_.close();
+
+    // Run the IO service.
+    io_service_.run();
+
+    // The connections should have been aborted.
+    EXPECT_EQ(1, connections_num_);
+    EXPECT_EQ(1, aborted_connections_num_);
+    EXPECT_EQ(1, connections_.size());
+}
+
+#endif
+
+}
diff --git a/src/lib/asiolink/tests/tls_socket_unittest.cc b/src/lib/asiolink/tests/tls_socket_unittest.cc
new file mode 100644
index 0000000..c2572c0
--- /dev/null
+++ b/src/lib/asiolink/tests/tls_socket_unittest.cc
@@ -0,0 +1,560 @@
+// Copyright (C) 2011-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+/// @brief Test of TLSSocket
+///
+/// Tests the functionality of a TLSSocket by working through an open-send-
+/// receive-close sequence and checking that the asynchronous notifications
+/// work.
+
+#include <config.h>
+#include <asiolink/asio_wrapper.h>
+#include <asiolink/io_service.h>
+#include <asiolink/tcp_endpoint.h>
+#include <asiolink/tls_socket.h>
+#include <asiolink/testutils/test_tls.h>
+#include <util/buffer.h>
+#include <util/io_utilities.h>
+
+#include <boost/shared_ptr.hpp>
+#include <gtest/gtest.h>
+
+#include <algorithm>
+#include <arpa/inet.h>
+#include <cstddef>
+#include <cstdlib>
+#include <errno.h>
+#include <netinet/in.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <string>
+#include <vector>
+
+using namespace boost::asio;
+using namespace boost::asio::ip;
+using namespace isc::util;
+using namespace isc::asiolink;
+using namespace std;
+
+namespace {
+
+const char SERVER_ADDRESS[] = "127.0.0.1";
+const unsigned short SERVER_PORT = 5303;
+
+/// @todo Shouldn't we send something that is real message?
+const char OUTBOUND_DATA[] = "Data sent from client to server";
+const char INBOUND_DATA[] = "Returned data from server to client";
+}
+
+/// An instance of this object is passed to the asynchronous I/O functions
+/// and the operator() method is called when when an asynchronous I/O completes.
+/// The arguments to the completion callback are stored for later retrieval.
+class TLSCallback {
+public:
+    /// @brief Operations the server is doing
+    enum Operation {
+        ACCEPT = 0,     ///< accept() was issued
+        OPEN = 1,       ///< Client connected to server
+        HANDSHAKE = 2,  ///< TLS handshake completed
+        READ = 3,       ///< Asynchronous read completed
+        WRITE = 4,      ///< Asynchronous write completed
+        NONE = 5        ///< "Not set" state
+    };
+
+    /// @brief Minimum size of buffers
+    enum {
+        MIN_SIZE = (64 * 1024 + 2)          ///< 64kB + two bytes for a count
+    };
+
+    struct PrivateData {
+        PrivateData() :
+            error_code_(), length_(0), cumulative_(0), expected_(0), offset_(0),
+            name_(""), queued_(NONE), called_(NONE), data_(MIN_SIZE, 0)
+        {}
+
+        boost::system::error_code  error_code_;    ///< Completion error code
+        size_t                     length_;        ///< Bytes transferred in this I/O
+        size_t                     cumulative_;    ///< Cumulative bytes transferred
+        size_t                     expected_;      ///< Expected amount of data
+        size_t                     offset_;        ///< Where to put data in buffer
+        std::string                name_;          ///< Which of the objects this is
+        Operation                  queued_;        ///< Queued operation
+        Operation                  called_;        ///< Which callback called
+        std::vector<uint8_t>       data_;          ///< Receive buffer
+    };
+
+    /// @brief Constructor
+    ///
+    /// Constructs the object.  It also creates the data member pointed to by
+    /// a shared pointer.  When used as a callback object, this is copied as it
+    /// is passed into the asynchronous function.  This means that there are two
+    /// objects and inspecting the one we passed in does not tell us anything.
+    ///
+    /// Therefore we use a boost::shared_ptr.  When the object is copied, the
+    /// shared pointer is copied, which leaves both objects pointing to the same
+    /// data.
+    ///
+    /// @param which Which of the two callback objects this is
+    TLSCallback(std::string which) : ptr_(new PrivateData())
+    {
+        ptr_->name_ = which;
+    }
+
+    /// @brief Destructor
+    ///
+    /// No code needed, destroying the shared pointer destroys the private data.
+    virtual ~TLSCallback()
+    {}
+
+    /// @brief Client Callback Function
+    ///
+    /// Called when an asynchronous operation is completed by the client, this
+    /// stores the origin of the operation in the client_called_ data member.
+    ///
+    /// @param ec I/O completion error code passed to callback function.
+    /// @param length Number of bytes transferred
+    void operator()(boost::system::error_code ec = boost::system::error_code(),
+                            size_t length = 0)
+    {
+        setCode(ec.value());
+        ptr_->called_ = ptr_->queued_;
+        ptr_->length_ = length;
+    }
+
+    /// @brief Get I/O completion error code
+    int getCode() {
+        return (ptr_->error_code_.value());
+    }
+
+    /// @brief Set I/O completion code
+    ///
+    /// @param code New value of completion code
+    void setCode(int code) {
+        ptr_->error_code_ = boost::system::error_code(code, boost::system::error_code().category());
+    }
+
+    /// @brief Get number of bytes transferred in I/O
+    size_t& length() {
+        return (ptr_->length_);
+    }
+
+    /// @brief Get cumulative number of bytes transferred in I/O
+    size_t& cumulative() {
+        return (ptr_->cumulative_);
+    }
+
+    /// @brief Get expected amount of data
+    size_t& expected() {
+        return (ptr_->expected_);
+    }
+
+    /// @brief Get offset into data
+    size_t& offset() {
+        return (ptr_->offset_);
+    }
+
+    /// @brief Get data member
+    uint8_t* data() {
+        return (&ptr_->data_[0]);
+    }
+
+    /// @brief Get flag to say what was queued
+    Operation& queued() {
+        return (ptr_->queued_);
+    }
+
+    /// @brief Get flag to say when callback was called
+    Operation& called() {
+        return (ptr_->called_);
+    }
+
+    /// @brief Return instance of callback name
+    std::string& name() {
+        return (ptr_->name_);
+    }
+
+private:
+    boost::shared_ptr<PrivateData>  ptr_;   ///< Pointer to private data
+};
+
+
+// Read Server Data
+//
+// Called in the part of the test that has the client send a message to the
+// server, this loops until all the data has been read (synchronously) by the
+// server.
+//
+// "All the data read" means that the server has received a message that is
+// preceded by a two-byte count field and that the total amount of data received
+// from the remote end is equal to the value in the count field plus two bytes
+// for the count field itself.
+//
+// @param stream Stream on which the server is reading data
+// @param server_cb Structure in which server data is held.
+void
+serverRead(TlsStreamImpl& stream, TLSCallback& server_cb) {
+
+    // As we may need to read multiple times, keep a count of the cumulative
+    // amount of data read and do successive reads into the appropriate part
+    // of the buffer.
+    //
+    // Note that there are no checks for buffer overflow - this is a test
+    // program and we have sized the buffer to be large enough for the test.
+    server_cb.cumulative() = 0;
+
+    bool complete = false;
+    while (!complete) {
+
+        // Read block of data and update cumulative amount of data received.
+        server_cb.length() = stream.read_some(
+            boost::asio::buffer(server_cb.data() + server_cb.cumulative(),
+                                TLSCallback::MIN_SIZE - server_cb.cumulative()));
+        server_cb.cumulative() += server_cb.length();
+
+        // If we have read at least two bytes, we can work out how much we
+        // should be reading.
+        if (server_cb.cumulative() >= 2) {
+            server_cb.expected() = readUint16(server_cb.data(), server_cb.length());
+            if ((server_cb.expected() + 2) == server_cb.cumulative()) {
+
+                // Amount of data read from stream equals the size of the
+                // message (as indicated in the first two bytes of the message)
+                // plus the size of the count field.  Therefore we have received
+                // all the data.
+                complete = true;
+            }
+        }
+    }
+}
+
+// Receive complete method should return true only if the count in the first
+// two bytes is equal to the size of the rest if the buffer.
+
+TEST(TLSSocket, processReceivedData) {
+    // Amount of "real" data in the buffer
+    const uint16_t PACKET_SIZE = 16382;
+
+    // Used to instantiate socket
+    IOService service;
+    TlsContextPtr context(new TlsContext(CLIENT));
+    // Socket under test
+    TLSSocket<TLSCallback> test(service, context);
+    // Buffer to check
+    uint8_t inbuff[PACKET_SIZE + 2];
+    // Where data is put
+    OutputBufferPtr outbuff(new OutputBuffer(16));
+    // Expected amount of data
+    size_t expected;
+    // Where to put next data
+    size_t offset;
+    // Cumulative data received
+    size_t cumulative;
+
+    // Set some dummy values in the buffer to check
+    for (size_t i = 0; i < sizeof(inbuff); ++i) {
+        inbuff[i] = i % 256;
+    }
+
+    // Check that the method will handle various receive sizes.
+    writeUint16(PACKET_SIZE, inbuff, sizeof(inbuff));
+
+    cumulative = 0;
+    offset = 0;
+    expected = 0;
+    outbuff->clear();
+    bool complete = test.processReceivedData(inbuff, 1, cumulative, offset,
+                                             expected, outbuff);
+    EXPECT_FALSE(complete);
+    EXPECT_EQ(1, cumulative);
+    EXPECT_EQ(1, offset);
+    EXPECT_EQ(0, expected);
+    EXPECT_EQ(0, outbuff->getLength());
+
+    // Now pretend that we've received one more byte.
+    complete = test.processReceivedData(inbuff, 1, cumulative, offset, expected,
+                                        outbuff);
+    EXPECT_FALSE(complete);
+    EXPECT_EQ(2, cumulative);
+    EXPECT_EQ(0, offset);
+    EXPECT_EQ(PACKET_SIZE, expected);
+    EXPECT_EQ(0, outbuff->getLength());
+
+    // Add another two bytes.  However, this time note that we have to offset
+    // in the input buffer because it is expected that the next chunk of data
+    // from the connection will be read into the start of the buffer.
+    complete = test.processReceivedData(inbuff + cumulative, 2, cumulative,
+                                        offset, expected, outbuff);
+    EXPECT_FALSE(complete);
+    EXPECT_EQ(4, cumulative);
+    EXPECT_EQ(0, offset);
+    EXPECT_EQ(PACKET_SIZE, expected);
+    EXPECT_EQ(2, outbuff->getLength());
+
+    const uint8_t* dataptr = static_cast<const uint8_t*>(outbuff->getData());
+    EXPECT_TRUE(equal(inbuff + 2, inbuff + cumulative, dataptr));
+
+    // And add the remaining data.  Remember that "inbuff" is "PACKET_SIZE + 2"
+    // long.
+    complete = test.processReceivedData(inbuff + cumulative,
+                                        PACKET_SIZE + 2 - cumulative,
+                                        cumulative, offset, expected, outbuff);
+    EXPECT_TRUE(complete);
+    EXPECT_EQ(PACKET_SIZE + 2, cumulative);
+    EXPECT_EQ(0, offset);
+    EXPECT_EQ(PACKET_SIZE, expected);
+    EXPECT_EQ(PACKET_SIZE, outbuff->getLength());
+    dataptr = static_cast<const uint8_t*>(outbuff->getData());
+    EXPECT_TRUE(equal(inbuff + 2, inbuff + cumulative, dataptr));
+}
+
+/// @todo Need to add a test to check the cancel() method
+
+// Tests the operation of a TLSSocket by opening it, sending an asynchronous
+// message to a server, receiving an asynchronous message from the server and
+// closing.
+TEST(TLSSocket, sequenceTest) {
+
+    // Common objects.
+    // Service object for async control
+    IOService service;
+
+    // The client - the TLSSocket being tested
+    TlsContextPtr client_ctx;
+    test::configClient(client_ctx);
+    // Socket under test
+    TLSSocket<TLSCallback> client(service, client_ctx);
+    // Async I/O callback function
+    TLSCallback client_cb("Client");
+    // Where client receives message from
+    TCPEndpoint client_remote_endpoint;
+    // Received data is put here
+    OutputBufferPtr client_buffer(new OutputBuffer(128));
+    // The server - with which the client communicates.
+    // Address of target server
+    IOAddress server_address(SERVER_ADDRESS);
+    // Server callback
+    TLSCallback server_cb("Server");
+    // Endpoint describing server
+    TCPEndpoint server_endpoint(server_address, SERVER_PORT);
+    // Address where server received message from
+    TCPEndpoint server_remote_endpoint;
+    TlsContextPtr server_ctx;
+    test::configServer(server_ctx);
+    // Stream used for server.
+    TlsStreamImpl server(service.get_io_service(), server_ctx->getContext());
+
+    // Step 1.  Create the connection between the client and the server.  Set
+    // up the server to accept incoming connections and have the client open
+    // a channel to it.
+
+    // Set up server - open socket and queue an accept.
+    server_cb.queued() = TLSCallback::ACCEPT;
+    server_cb.called() = TLSCallback::NONE;
+    server_cb.setCode(42);  // Some error
+    tcp::acceptor acceptor(service.get_io_service(),
+                           tcp::endpoint(tcp::v4(), SERVER_PORT));
+    acceptor.set_option(tcp::acceptor::reuse_address(true));
+    acceptor.async_accept(server.lowest_layer(), server_cb);
+
+    // Set up client - connect to the server.
+    client_cb.queued() = TLSCallback::OPEN;
+    client_cb.called() = TLSCallback::NONE;
+    client_cb.setCode(43);  // Some error
+    EXPECT_FALSE(client.isOpenSynchronous());
+    client.open(&server_endpoint, client_cb);
+
+    // Run the open and the accept callback and check that they ran.
+    while ((server_cb.called() == TLSCallback::NONE) ||
+           (client_cb.called() == TLSCallback::NONE)) {
+        service.run_one();
+    }
+    EXPECT_EQ(TLSCallback::ACCEPT, server_cb.called());
+    EXPECT_EQ(0, server_cb.getCode());
+
+    EXPECT_EQ(TLSCallback::OPEN, client_cb.called());
+
+    // On some operating system the async_connect may return EINPROGRESS.
+    // This doesn't necessarily indicate an error. In most cases trying
+    // to asynchronously write and read from the socket would work just
+    // fine.
+    if ((client_cb.getCode()) != 0 && (client_cb.getCode() != EINPROGRESS)) {
+        ADD_FAILURE() << "expected error code of 0 or " << EINPROGRESS
+            << " as a result of async_connect, got " << client_cb.getCode();
+    }
+
+    // Perform handshake.
+    client_cb.queued() = TLSCallback::HANDSHAKE;
+    client_cb.called() = TLSCallback::NONE;
+    client_cb.setCode(43);  // Some error
+    client.handshake(client_cb);
+
+    server_cb.queued() = TLSCallback::HANDSHAKE;
+    server_cb.called() = TLSCallback::NONE;
+    server_cb.setCode(42);  // Some error
+    server.async_handshake(roleToImpl(TlsRole::SERVER), server_cb);
+
+    while ((server_cb.called() == TLSCallback::NONE) ||
+           (client_cb.called() == TLSCallback::NONE)) {
+        service.run_one();
+    }
+    EXPECT_EQ(TLSCallback::HANDSHAKE, client_cb.called());
+    EXPECT_EQ(0, client_cb.getCode());
+
+    EXPECT_EQ(TLSCallback::HANDSHAKE, server_cb.called());
+    EXPECT_EQ(0, server_cb.getCode());
+
+    // Step 2.  Get the client to write to the server asynchronously.  The
+    // server will loop reading the data synchronously.
+
+    // Write asynchronously to the server.
+    client_cb.called() = TLSCallback::NONE;
+    client_cb.queued() = TLSCallback::WRITE;
+    client_cb.setCode(143);  // Arbitrary number
+    client_cb.length() = 0;
+    client.asyncSend(OUTBOUND_DATA, sizeof(OUTBOUND_DATA), &server_endpoint, client_cb);
+
+    // Wait for the client callback to complete. (Must do this first on
+    // Solaris: if we do the synchronous read first, the test hangs.)
+    while (client_cb.called() == TLSCallback::NONE) {
+        service.run_one();
+    }
+
+    // Synchronously read the data from the server.;
+    serverRead(server, server_cb);
+
+    // Check the client state
+    EXPECT_EQ(TLSCallback::WRITE, client_cb.called());
+    EXPECT_EQ(0, client_cb.getCode());
+    EXPECT_EQ(sizeof(OUTBOUND_DATA) + 2, client_cb.length());
+
+    // ... and check what the server received.
+    EXPECT_EQ(sizeof(OUTBOUND_DATA) + 2, server_cb.cumulative());
+    EXPECT_TRUE(equal(OUTBOUND_DATA,
+                (OUTBOUND_DATA + (sizeof(OUTBOUND_DATA) - 1)),
+                (server_cb.data() + 2)));
+
+    // Step 3.  Get the server to write all the data asynchronously and have the
+    // client loop (asynchronously) reading the data.  Note that we copy the
+    // data into the server's internal buffer in order to precede it with a two-
+    // byte count field.
+
+    // Have the server write asynchronously to the client.
+    server_cb.called() = TLSCallback::NONE;
+    server_cb.queued() = TLSCallback::WRITE;
+    server_cb.length() = 0;
+    server_cb.cumulative() = 0;
+
+    writeUint16(sizeof(INBOUND_DATA), server_cb.data(), TLSCallback::MIN_SIZE);
+    copy(INBOUND_DATA, (INBOUND_DATA + sizeof(INBOUND_DATA) - 1),
+        (server_cb.data() + 2));
+    boost::asio::async_write(server,
+                             boost::asio::buffer(server_cb.data(),
+                                                 (sizeof(INBOUND_DATA) + 2)),
+                             server_cb);
+
+    // Have the client read asynchronously.
+    client_cb.called() = TLSCallback::NONE;
+    client_cb.queued() = TLSCallback::READ;
+    client_cb.length() = 0;
+    client_cb.cumulative() = 0;
+    client_cb.expected() = 0;
+    client_cb.offset() = 0;
+
+    client.asyncReceive(client_cb.data(), TLSCallback::MIN_SIZE,
+                        client_cb.offset(), &client_remote_endpoint,
+                        client_cb);
+
+    // Run the callbacks. Several options are possible depending on how ASIO
+    // is implemented and whether the message gets fragmented:
+    //
+    // 1) The send handler may complete immediately, regardless of whether the
+    // data has been read by the client.  (This is the most likely.)
+    // 2) The send handler may only run after all the data has been read by
+    // the client. (This could happen if the client's TCP buffers were too
+    // small so the data was not transferred to the "remote" system until the
+    // remote buffer has been emptied one or more times.)
+    // 3) The client handler may be run a number of times to handle the message
+    // fragments and the server handler may run between calls of the client
+    // handler.
+    //
+    // So loop, running one handler at a time until we are certain that all the
+    // handlers have run.
+
+    bool server_complete = false;
+    bool client_complete = false;
+    while (!server_complete || !client_complete) {
+        service.run_one();
+
+        // Has the server run?
+        if (!server_complete) {
+            if (server_cb.called() != TLSCallback::NONE) {
+
+                // Yes.  Check that the send completed successfully and that
+                // all the data that was expected to have been sent was in fact
+                // sent.
+                EXPECT_EQ(TLSCallback::WRITE, server_cb.called());
+                EXPECT_EQ(0, server_cb.getCode());
+                EXPECT_EQ((sizeof(INBOUND_DATA) + 2), server_cb.length());
+                server_complete = true;
+            }
+        }
+
+        // Has the client run?
+        if (!client_complete) {
+
+            if (client_cb.called() == TLSCallback::NONE) {
+                // No. Run the service another time.
+                continue;
+            }
+
+            // Client callback must have run.  Check that it ran OK.
+            EXPECT_EQ(TLSCallback::READ, client_cb.called());
+            EXPECT_EQ(0, client_cb.getCode());
+
+            // Check if we need to queue another read, copying the data into
+            // the output buffer as we do so.
+            client_complete = client.processReceivedData(client_cb.data(),
+                                                         client_cb.length(),
+                                                         client_cb.cumulative(),
+                                                         client_cb.offset(),
+                                                         client_cb.expected(),
+                                                         client_buffer);
+
+            // If the data is not complete, queue another read.
+            if (!client_complete) {
+                client_cb.called() = TLSCallback::NONE;
+                client_cb.queued() = TLSCallback::READ;
+                client_cb.length() = 0;
+                client.asyncReceive(client_cb.data(), TLSCallback::MIN_SIZE ,
+                                    client_cb.offset(), &client_remote_endpoint,
+                                    client_cb);
+            }
+        }
+    }
+
+    // Both the send and the receive have completed.  Check that the received
+    // is what was sent.
+
+    // Check the client state
+    EXPECT_EQ(TLSCallback::READ, client_cb.called());
+    EXPECT_EQ(0, client_cb.getCode());
+    EXPECT_EQ(sizeof(INBOUND_DATA) + 2, client_cb.cumulative());
+    EXPECT_EQ(sizeof(INBOUND_DATA), client_buffer->getLength());
+
+    // ... and check what the server sent.
+    EXPECT_EQ(TLSCallback::WRITE, server_cb.called());
+    EXPECT_EQ(0, server_cb.getCode());
+    EXPECT_EQ(sizeof(INBOUND_DATA) + 2, server_cb.length());
+
+    // ... and that what was sent is what was received.
+    const uint8_t* received = static_cast<const uint8_t*>(client_buffer->getData());
+    EXPECT_TRUE(equal(INBOUND_DATA, (INBOUND_DATA + (sizeof(INBOUND_DATA) - 1)),
+                      received));
+
+    // Close client and server.
+    EXPECT_NO_THROW(client.close());
+    EXPECT_NO_THROW(server.lowest_layer().close());
+}
diff --git a/src/lib/asiolink/tests/tls_unittest.cc b/src/lib/asiolink/tests/tls_unittest.cc
new file mode 100644
index 0000000..35fc8c4
--- /dev/null
+++ b/src/lib/asiolink/tests/tls_unittest.cc
@@ -0,0 +1,2695 @@
+// Copyright (C) 2021-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <asiolink/asio_wrapper.h>
+#include <asiolink/io_service.h>
+#include <asiolink/interval_timer.h>
+#include <asiolink/crypto_tls.h>
+#include <asiolink/tcp_endpoint.h>
+#include <asiolink/testutils/test_tls.h>
+
+#include <boost/scoped_ptr.hpp>
+#include <gtest/gtest.h>
+
+#include <cstdlib>
+#include <list>
+#include <string>
+#include <vector>
+
+#ifdef WITH_OPENSSL
+#include <openssl/opensslv.h>
+#endif
+
+using namespace boost::asio;
+using namespace boost::asio::ip;
+using namespace isc::asiolink;
+using namespace isc::cryptolink;
+using namespace std;
+
+namespace { // anonymous namespace.
+
+/// @brief Local server address used for testing.
+const char SERVER_ADDRESS[] = "127.0.0.1";
+
+/// @brief Local server port used for testing.
+const unsigned short SERVER_PORT = 18123;
+
+/// @brief Name of the environment variable controlling the display
+/// (default off) of TLS error messages.
+const char KEA_TLS_CHECK_VERBOSE[] = "KEA_TLS_CHECK_VERBOSE";
+
+/// @brief Test TLS context class exposing protected methods.
+class TestTlsContext : public TlsContext {
+public:
+    /// @brief Constructor.
+    ///
+    /// @param role The TLS role client or server.
+    explicit TestTlsContext(TlsRole role) : TlsContext(role) { }
+
+    /// @brief Destructor.
+    virtual ~TestTlsContext() { }
+
+    /// @brief Make protected methods visible in tests.
+    using TlsContext::setCertRequired;
+    using TlsContext::loadCaFile;
+    using TlsContext::loadCaPath;
+    using TlsContext::loadCertFile;
+    using TlsContext::loadKeyFile;
+};
+
+/// @brief Class of test callbacks.
+class TestCallback {
+public:
+    /// @brief State part.
+    class State {
+    public:
+        /// @brief Constructor.
+        State() : called_(false), error_code_() {
+        }
+
+        /// @brief Destructor.
+        virtual ~State() {
+        }
+
+        /// @brief Called flag.
+        ///
+        /// Initialized to false, set to true when the callback is called.
+        bool called_;
+
+        /// @brief Last error code.
+        boost::system::error_code error_code_;
+    };
+
+    /// @brief Constructor.
+    ///
+    /// Used to shared pointer to state to allow the callback object to
+    /// be copied keeping the state member values.
+    TestCallback()
+        : state_(new State()), tcpp_(0) {
+    }
+
+    /// @brief Close on error constructor.
+    ///
+    /// An overload which takes the stream to close on error.
+    ///
+    /// @param tcpp Pointer to the stream to close on error.
+    TestCallback(TlsStream<TestCallback>::lowest_layer_type* tcpp)
+        : state_(new State()), tcpp_(tcpp) {
+    }
+
+    /// @brief Destructor.
+    virtual ~TestCallback() {
+    }
+
+    /// @brief Callback function (one argument).
+    ///
+    /// @parame ec Boost completion code.
+    void operator()(const boost::system::error_code& ec) {
+        state_->called_ = true;
+        state_->error_code_ = ec;
+        if (ec && tcpp_) {
+            tcpp_->close();
+        }
+    }
+
+    /// @brief Callback function (two arguments).
+    ///
+    /// @parame ec Boost completion code.
+    void operator()(const boost::system::error_code& ec, size_t) {
+        state_->called_ = true;
+        state_->error_code_ = ec;
+        if (ec && tcpp_) {
+            tcpp_->close();
+        }
+    }
+
+    /// @brief Get called value.
+    inline bool getCalled() const {
+        return (state_->called_);
+    }
+
+    /// @brief Get error code.
+    inline const boost::system::error_code& getCode() const {
+        return (state_->error_code_);
+    }
+
+protected:
+    /// @brief Pointer to state.
+    boost::shared_ptr<State> state_;
+
+    /// @brief Pointer to the stream to close on error.
+    TlsStream<TestCallback>::lowest_layer_type* tcpp_;
+};
+
+/// @brief The type of a test to be run.
+typedef function<void()> Test;
+
+/// @brief Class of an expected behavior.
+///
+/// Some TLS tests can not use the standard GTEST macros because they
+/// show different behaviors depending on the crypto backend and the
+/// boost library versions. Worse in some cases the behavior can not
+/// be deduced from them so #ifdef's do not work...
+///
+/// Until this is adopted / widespread the policy is to use these flexible
+/// expected behavior tests ONLY when needed.
+class Expected {
+private:
+    /// Constructor.
+    ///
+    /// @param throwing True when an exception should be thrown.
+    /// @param timeout True when a timeout should occur.
+    /// @param no_error True when no error should be returned.
+    /// @param message Expected message.
+    Expected(bool throwing, bool timeout, bool no_error,
+             const string& message)
+        : throwing_(throwing), timeout_(timeout), no_error_(no_error),
+          message_(message) {
+    }
+
+    /// @brief The throwing flag.
+    bool throwing_;
+
+    /// @brief The timeout flag.
+    bool timeout_;
+
+    /// @brief The no error flag.
+    bool no_error_;
+
+    /// @brief The expected error message.
+    string message_;
+
+public:
+    /// @brief Create an expected throwing exception behavior.
+    ///
+    /// @param message Expected message.
+    static Expected createThrow(const string& message) {
+        return (Expected(true, false, false, message));
+    }
+
+    /// @brief Create an expected timeout behavior.
+    static Expected createTimeout() {
+        return (Expected(false, true, false, ""));
+    }
+
+    /// @brief Create an expected no error behavior.
+    static Expected createNoError() {
+        return (Expected(false, false, true, ""));
+    }
+
+    /// @brief Create an expected error message behavior.
+    ///
+    /// @param message Expected message.
+    static Expected createError(const string& message) {
+        return (Expected(false, false, false, message));
+    }
+
+    /// @brief Get the throwing flag.
+    ///
+    /// @return The throwing flag.
+    bool getThrow() const {
+        return (throwing_);
+    }
+
+    /// @brief Get the timeout flag.
+    ///
+    /// @return The timeout flag.
+    bool getTimeout() const {
+        return (timeout_);
+    }
+
+    /// @brief Get the no error flag.
+    ///
+    /// @return The no error flag.
+    bool getNoError() const {
+        return (no_error_);
+    }
+
+    /// @brief Get the expected error message.
+    ///
+    /// @return The expected error message.
+    const string& getMessage() const {
+        return (message_);
+    }
+};
+
+/// @brief Class of expected behaviors.
+class Expecteds {
+private:
+    /// @brief List of expected behaviors.
+    list<Expected> list_;
+
+    /// @brief The error message for the verbose mode.
+    string errmsg_;
+
+public:
+    /// Constructor.
+    ///
+    /// @return An empty expected behavior list.
+    Expecteds() : list_(), errmsg_("") {
+    }
+
+    /// @brief Clear the list.
+    void clear() {
+        list_.clear();
+        errmsg_.clear();
+    }
+
+    /// @brief Add an expected throwing exception behavior.
+    ///
+    /// @param message Expected message.
+    void addThrow(const string& message) {
+        list_.push_back(Expected::createThrow(message));
+    }
+
+    /// @brief Add an expected timeout behavior.
+    void addTimeout() {
+        list_.push_back(Expected::createTimeout());
+    }
+
+    /// @brief Add an expected no error behavior.
+    void addNoError() {
+        list_.push_back(Expected::createNoError());
+    }
+
+    /// @brief Add an expected error message behavior.
+    ///
+    /// @param message Expected message.
+    void addError(const string& message) {
+        list_.push_back(Expected::createError(message));
+    }
+
+    /// @brief Display error messages.
+    ///
+    /// @return True if error messages are displayed.
+    static bool displayErrMsg() {
+        return (getenv(KEA_TLS_CHECK_VERBOSE));
+    }
+
+    /// @brief Has an error message.
+    ///
+    /// @return True when there is a cached error message.
+    bool hasErrMsg() const {
+        return (!errmsg_.empty());
+    }
+
+    /// @brief Get error message.
+    ///
+    /// @return The cached error message.
+    const string& getErrMsg() const {
+        return (errmsg_);
+    }
+
+    /// @brief Run a test which can throw.
+    ///
+    /// @param test The test to run.
+    void runCanThrow(const Test& test) {
+        // Check consistency.
+        for (auto const& exp : list_) {
+            if (!exp.getThrow() && !exp.getNoError()) {
+                ADD_FAILURE() << "inconsistent runCanThrow settings";
+            }
+        }
+
+        // Collect the test behavior.
+        bool thrown = false;
+        try {
+            test();
+        } catch (const LibraryError& ex) {
+            thrown = true;
+            errmsg_ = ex.what();
+        } catch (const isc::BadValue& ex) {
+            thrown = true;
+            errmsg_ = ex.what();
+        } catch (const exception& ex) {
+            thrown = true;
+            errmsg_ = ex.what();
+            ADD_FAILURE() << "expect only LibraryError or BadValue exception";
+        }
+
+        // Check the no error case.
+        if (!thrown) {
+            for (auto const& exp : list_) {
+                if (exp.getNoError()) {
+                    // No error was expected: good.
+                    return;
+                }
+            }
+            // No error was not expected: bad.
+            ADD_FAILURE() << "no exception?";
+            return;
+        }
+
+        // Check the thrown message.
+        for (auto const& exp : list_) {
+            if (!exp.getThrow()) {
+                continue;
+            }
+            if (errmsg_ == exp.getMessage()) {
+                // Got an expected message: good.
+                return;
+            }
+        }
+        // The message was not expected: bad.
+        ADD_FAILURE() << "exception with unknown '" << errmsg_ << "'";
+    }
+
+    /// @brief Check the result of an asynchronous operation.
+    ///
+    /// @param party The name of the party.
+    /// @param callback The test callback of the an asynchronous.
+    void checkAsync(const string& party, const TestCallback& callback) {
+        // Check timeout i.e. the callback was not called.
+        if (!callback.getCalled()) {
+            bool expected = false;
+            for (auto const& exp : list_) {
+                if (exp.getTimeout()) {
+                    expected = true;
+                    break;
+                }
+            }
+            if (!expected) {
+                ADD_FAILURE() << "unexpected timeout";
+            }
+        }
+
+        // Check the no error case.
+        const boost::system::error_code& ec = callback.getCode();
+        if (!ec) {
+            for (auto const& exp : list_) {
+                if (exp.getTimeout() || exp.getNoError()) {
+                    // Expected timeout or no error: good.
+                    return;
+                }
+            }
+            // Should have failed but did not: bad.
+            ADD_FAILURE() << party << " did not failed as expected";
+            return;
+        }
+
+        // Got an error but was this one expected?
+        errmsg_ = ec.message();
+        for (auto const& exp : list_) {
+            if (exp.getTimeout() || exp.getNoError()) {
+                continue;
+            }
+            if (errmsg_ == exp.getMessage()) {
+                // This error message was expected: good.
+                return;
+            }
+        }
+        ADD_FAILURE() << party << " got unexpected error '" << errmsg_ << "'";
+    }
+
+};
+
+////////////////////////////////////////////////////////////////////////
+//                              TlsContext tests                      //
+////////////////////////////////////////////////////////////////////////
+
+// Test if we can get a client context.
+TEST(TLSTest, clientContext) {
+    TlsContextPtr ctx;
+    EXPECT_NO_THROW(ctx.reset(new TlsContext(TlsRole::CLIENT)));
+}
+
+// Test if we can get a server context.
+TEST(TLSTest, serverContext) {
+    TlsContextPtr ctx;
+    EXPECT_NO_THROW(ctx.reset(new TlsContext(TlsRole::SERVER)));
+}
+
+// Test if the cert required flag is handled as expected.
+TEST(TLSTest, certRequired) {
+    auto check = [] (TlsContext& ctx) -> bool {
+#ifdef WITH_BOTAN
+        return (ctx.getCertRequired());
+#else // WITH_OPENSSL
+        ::SSL_CTX* ssl_ctx = ctx.getNativeContext();
+        if (!ssl_ctx) {
+            ADD_FAILURE() << "null SSL_CTX";
+            return (false);
+        }
+        int mode = SSL_CTX_get_verify_mode(ssl_ctx);
+        switch (mode) {
+        case SSL_VERIFY_NONE:
+            return (false);
+        case (SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT):
+            return (true);
+        default:
+            ADD_FAILURE() << "unknown ssl_verify_mode: " << mode;
+            return (false);
+        }
+#endif
+    };
+
+    TestTlsContext ctx(TlsRole::SERVER);
+    EXPECT_TRUE(ctx.getCertRequired());
+    EXPECT_TRUE(check(ctx));
+    ASSERT_NO_THROW(ctx.setCertRequired(false));
+    EXPECT_FALSE(ctx.getCertRequired());
+    EXPECT_FALSE(check(ctx));
+    ASSERT_NO_THROW(ctx.setCertRequired(true));
+    EXPECT_TRUE(ctx.getCertRequired());
+    EXPECT_TRUE(check(ctx));
+
+    // Client role is different so test it too.
+    TestTlsContext cctx(TlsRole::CLIENT);
+    EXPECT_TRUE(cctx.getCertRequired());
+    EXPECT_TRUE(check(cctx));
+    ASSERT_NO_THROW(cctx.setCertRequired(true));
+    EXPECT_TRUE(cctx.getCertRequired());
+    EXPECT_TRUE(check(cctx));
+    EXPECT_THROW(cctx.setCertRequired(false), isc::BadValue);
+}
+
+// Test if the certificate authority can be loaded.
+TEST(TLSTest, loadCAFile) {
+    string ca(string(TEST_CA_DIR) + "/kea-ca.crt");
+    TestTlsContext ctx(TlsRole::CLIENT);
+    EXPECT_NO_THROW(ctx.loadCaFile(ca));
+}
+
+// Test that no certificate authority gives an error.
+TEST(TLSTest, loadNoCAFile) {
+    Expecteds exps;
+    // Botan error.
+    exps.addThrow("I/O error: DataSource: Failure opening file /no-such-file");
+    // OpenSSL errors.
+    exps.addThrow("No such file or directory");
+    exps.addThrow("No such file or directory (system library)");
+    exps.addThrow("No such file or directory (system library, fopen)");
+    exps.runCanThrow([] {
+        string ca("/no-such-file");
+        TestTlsContext ctx(TlsRole::CLIENT);
+        ctx.loadCaFile(ca);
+    });
+    if (Expecteds::displayErrMsg()) {
+        std::cout << exps.getErrMsg() << "\n";
+    }
+}
+
+#ifdef WITH_BOTAN
+// Test that Botan requires a real CA certificate so fails with
+// trusted self-signed client.
+/// @note: convert to GTEST when gtest_utils.h will be moved.
+TEST(TLSTest, loadTrustedSelfCAFile) {
+    Expecteds exps;
+    // Botan error.
+    string botan_error = "Flatfile_Certificate_Store received non CA cert ";
+    botan_error += "C=\"US\",X520.State=\"Some-State\",O=\"ISC Inc.\",";
+    botan_error += "CN=\"kea-self\"";
+    exps.addThrow(botan_error);
+    exps.runCanThrow([] {
+        string ca(string(TEST_CA_DIR) + "/kea-self.crt");
+        TestTlsContext ctx(TlsRole::CLIENT);
+        ctx.loadCaFile(ca);
+    });
+    if (Expecteds::displayErrMsg()) {
+        std::cout << exps.getErrMsg() << "\n";
+    }
+}
+#endif // WITH_BOTAN
+
+// Test that a directory can be loaded.
+TEST(TLSTest, loadCAPath) {
+    string ca(TEST_CA_DIR);
+    TestTlsContext ctx(TlsRole::CLIENT);
+    EXPECT_NO_THROW(ctx.loadCaPath(ca));
+}
+
+// Test that a certificate is wanted.
+TEST(TLSTest, loadKeyCA) {
+    Expecteds exps;
+    // Botan error.
+    exps.addThrow("Flatfile_Certificate_Store::Flatfile_Certificate_Store cert file is empty");
+    // LibreSSL or old OpenSSL does not check.
+    exps.addNoError();
+    // Recent OpenSSL errors.
+    exps.addThrow("no certificate or crl found");
+    exps.addThrow("no certificate or crl found (x509 certificate routines)");
+    exps.addThrow("no certificate or crl found (x509 certificate routines, CRYPTO_internal)");
+    exps.addThrow("no certificate or crl found (x509 certificate routines, X509_load_cert_crl_file)");
+    exps.runCanThrow([] {
+        string ca(string(TEST_CA_DIR) + "/kea-ca.key");
+        TestTlsContext ctx(TlsRole::CLIENT);
+        ctx.loadCaFile(ca);
+    });
+    if (Expecteds::displayErrMsg()) {
+        std::cout << exps.getErrMsg() << "\n";
+    }
+}
+
+// Test if the end entity certificate can be loaded.
+TEST(TLSTest, loadCertFile) {
+    string cert(string(TEST_CA_DIR) + "/kea-client.crt");
+    TestTlsContext ctx(TlsRole::CLIENT);
+    EXPECT_NO_THROW(ctx.loadCertFile(cert));
+}
+
+// Test that no end entity certificate gives an error.
+TEST(TLSTest, loadNoCertFile) {
+    Expecteds exps;
+    // Botan error.
+    exps.addThrow("I/O error: DataSource: Failure opening file /no-such-file");
+    // OpenSSL errors.
+    exps.addThrow("No such file or directory");
+    exps.addThrow("No such file or directory (system library)");
+    exps.addThrow("No such file or directory (system library, fopen)");
+    exps.runCanThrow([] {
+        string cert("/no-such-file");
+        TestTlsContext ctx(TlsRole::CLIENT);
+        ctx.loadCertFile(cert);
+    });
+    if (Expecteds::displayErrMsg()) {
+        std::cout << exps.getErrMsg() << "\n";
+    }
+}
+
+// Test that a certificate is wanted.
+TEST(TLSTest, loadCsrCertFile) {
+    Expecteds exps;
+    // Botan error.
+    exps.addThrow("Expected a certificate, got 'CERTIFICATE REQUEST'");
+    // OpenSSL errors.
+    exps.addThrow("no start line");
+    exps.addThrow("no start line (PEM routines)");
+    exps.addThrow("no start line (PEM routines, get_name)");
+    exps.addThrow("no start line (PEM routines, CRYPTO_internal)");
+    exps.runCanThrow([] {
+        string cert(string(TEST_CA_DIR) + "/kea-client.csr");
+        TestTlsContext ctx(TlsRole::CLIENT);
+        ctx.loadCertFile(cert);
+    });
+    if (Expecteds::displayErrMsg()) {
+        std::cout << exps.getErrMsg() << "\n";
+    }
+}
+
+// Test if the private key can be loaded.
+TEST(TLSTest, loadKeyFile) {
+    string key(string(TEST_CA_DIR) + "/kea-client.key");
+    TestTlsContext ctx(TlsRole::CLIENT);
+    EXPECT_NO_THROW(ctx.loadKeyFile(key));
+}
+
+// Test that no private key gives an error.
+TEST(TLSTest, loadNoKeyFile) {
+    Expecteds exps;
+    // Botan error.
+    exps.addThrow("I/O error: DataSource: Failure opening file /no-such-file");
+    // OpenSSL errors.
+    exps.addThrow("No such file or directory");
+    exps.addThrow("No such file or directory (system library)");
+    exps.addThrow("No such file or directory (system library, fopen)");
+    // Another possible error.
+    exps.addThrow("PEM lib");
+    exps.runCanThrow([] {
+        string key("/no-such-file");
+        TestTlsContext ctx(TlsRole::CLIENT);
+        ctx.loadKeyFile(key);
+    });
+    if (Expecteds::displayErrMsg()) {
+        std::cout << exps.getErrMsg() << "\n";
+    }
+}
+
+// Test that a private key is wanted.
+TEST(TLSTest, loadCertKeyFile) {
+    Expecteds exps;
+    // Botan error.
+    string botan_error = "PKCS #8 private key decoding failed with PKCS #8: ";
+    botan_error += "Unknown PEM label CERTIFICATE";
+    exps.addThrow(botan_error);
+    // OpenSSL errors.
+    exps.addThrow("no start line");
+    exps.addThrow("no start line (PEM routines)");
+    exps.addThrow("no start line (PEM routines, get_name)");
+    exps.addThrow("no start line (PEM routines, CRYPTO_internal)");
+    exps.addThrow("PEM lib");
+    exps.addThrow("PEM lib (SSL routines)");
+    exps.addThrow("unsupported");
+    exps.addThrow("unsupported (DECODER routines)");
+    // Another possible error.
+    exps.addThrow("No such file or directory");
+    exps.runCanThrow([] {
+        string key(string(TEST_CA_DIR) + "/kea-client.crt");
+        TestTlsContext ctx(TlsRole::CLIENT);
+        ctx.loadKeyFile(key);
+    });
+    if (Expecteds::displayErrMsg()) {
+        std::cout << exps.getErrMsg() << "\n";
+    }
+}
+
+// Test that the certificate and private key must match.
+TEST(TLSTest, loadMismatch) {
+    Expecteds exps;
+    exps.addNoError();
+    exps.runCanThrow([] {
+        string cert(string(TEST_CA_DIR) + "/kea-server.crt");
+        TestTlsContext ctx(TlsRole::SERVER);
+        ctx.loadCertFile(cert);
+    });
+    // Keep no error for at least Botan.
+    // OpenSSL error.
+    exps.addThrow("key values mismatch");
+    exps.runCanThrow([] {
+        string key(string(TEST_CA_DIR) + "/kea-client.key");
+        TestTlsContext ctx(TlsRole::SERVER);
+        // In fact OpenSSL checks only RSA key values...
+        // The explicit check function is SSL_CTX_check_private_key.
+        ctx.loadKeyFile(key);
+    });
+    if (Expecteds::displayErrMsg()) {
+        std::cout << exps.getErrMsg() << "\n";
+    }
+}
+
+// Test the configure class method.
+TEST(TLSTest, configure) {
+    TlsContextPtr ctx;
+    string ca(string(TEST_CA_DIR) + "/kea-ca.crt");
+    string cert(string(TEST_CA_DIR) + "/kea-client.crt");
+    string key(string(TEST_CA_DIR) + "/kea-client.key");
+    EXPECT_NO_THROW(TlsContext::configure(ctx, TlsRole::CLIENT,
+                                          ca, cert, key, true));
+    ASSERT_TRUE(ctx);
+    EXPECT_EQ(TlsRole::CLIENT, ctx->getRole());
+    EXPECT_TRUE(ctx->getCertRequired());
+
+    // Retry using the directory and the server.
+    ctx.reset();
+    ca = TEST_CA_DIR;
+    cert = string(TEST_CA_DIR) + "/kea-server.crt";
+    key = string(TEST_CA_DIR) + "/kea-server.key";
+    EXPECT_NO_THROW(TlsContext::configure(ctx, TlsRole::SERVER,
+                                          ca, cert, key, false));
+    ASSERT_TRUE(ctx);
+    EXPECT_EQ(TlsRole::SERVER, ctx->getRole());
+    EXPECT_FALSE(ctx->getCertRequired());
+}
+
+// Test the configure class method error case.
+TEST(TLSTest, configureError) {
+    // The error case.
+    Expecteds exps;
+    // Common part of the error message.
+    string common_error = "load of cert file '/no-such-file' failed: ";
+    // Botan error.
+    string botan_error = "I/O error: DataSource: Failure opening file /no-such-file";
+    exps.addThrow(common_error + botan_error);
+    // OpenSSL errors.
+    string openssl_error = "No such file or directory";
+    exps.addThrow(common_error + openssl_error);
+    exps.addThrow(common_error + "No such file or directory (system library)");
+    exps.addThrow(common_error + "No such file or directory (system library, fopen)");
+    exps.runCanThrow([] {
+        TlsContextPtr ctx1;
+        string ca(string(TEST_CA_DIR) + "/kea-ca.crt");
+        string cert = "/no-such-file";
+        string key = string(TEST_CA_DIR) + "/kea-client.key";
+        TlsContext::configure(ctx1, TlsRole::CLIENT,
+                              ca, cert, key, true);
+        // The context is reset on errors.
+        EXPECT_FALSE(ctx1);
+    });
+    if (Expecteds::displayErrMsg()) {
+        std::cout << exps.getErrMsg() << "\n";
+    }
+}
+
+////////////////////////////////////////////////////////////////////////
+//                      Basic handshake failures                      //
+////////////////////////////////////////////////////////////////////////
+
+// Test if we can get a stream.
+TEST(TLSTest, stream) {
+    IOService service;
+    TlsContextPtr ctx(new TlsContext(TlsRole::CLIENT));
+    boost::scoped_ptr<TlsStream<TestCallback> > st;
+    EXPECT_NO_THROW(st.reset(new TlsStream<TestCallback>(service, ctx)));
+}
+
+// Test what happens when handshake is forgotten.
+TEST(TLSTest, noHandshake) {
+    IOService service;
+
+    // Server part.
+    TlsContextPtr server_ctx;
+    test::configServer(server_ctx);
+    TlsStream<TestCallback> server(service, server_ctx);
+
+    // Accept a client.
+    tcp::endpoint server_ep(tcp::endpoint(address::from_string(SERVER_ADDRESS),
+                                          SERVER_PORT));
+    tcp::acceptor acceptor(service.get_io_service(), server_ep);
+    acceptor.set_option(tcp::acceptor::reuse_address(true));
+    TestCallback accept_cb;
+    acceptor.async_accept(server.lowest_layer(), accept_cb);
+
+    // Client part.
+    TlsContextPtr client_ctx;
+    test::configClient(client_ctx);
+    TlsStream<TestCallback> client(service, client_ctx);
+
+    // Connect to.
+    client.lowest_layer().open(tcp::v4());
+    TestCallback connect_cb;
+    client.lowest_layer().async_connect(server_ep, connect_cb);
+
+    // Run accept and connect.
+    while (!accept_cb.getCalled() || !connect_cb.getCalled()) {
+        service.run_one();
+    }
+
+    // Verify the error codes.
+    if (accept_cb.getCode()) {
+        FAIL() << "accept error " << accept_cb.getCode().value()
+               << " '" << accept_cb.getCode().message() << "'";
+    }
+    // Possible EINPROGRESS for the client.
+    if (connect_cb.getCode() &&
+        (connect_cb.getCode().value() != EINPROGRESS)) {
+        FAIL() << "connect error " << connect_cb.getCode().value()
+               << " '" << connect_cb.getCode().message() << "'";
+    }
+
+    // Setup a timeout.
+    IntervalTimer timer1(service);
+    bool timeout = false;
+    timer1.setup([&timeout] { timeout = true; }, 100, IntervalTimer::ONE_SHOT);
+
+    // Send on the client.
+    char send_buf[] = "some text...";
+    TestCallback send_cb;
+    async_write(client, boost::asio::buffer(send_buf), send_cb);
+    while (!timeout && !send_cb.getCalled()) {
+        service.run_one();
+    }
+    timer1.cancel();
+
+    Expecteds exps;
+    // Botan error.
+    exps.addError("InvalidObjectState");
+    // OpenSSL errors.
+    exps.addError("uninitialized");
+    exps.addError("uninitialized (SSL routines)");
+    exps.addError("uninitialized (SSL routines, ST_BEFORE_ACCEPT)");
+    exps.addError("uninitialized (SSL routines, ssl_write_internal)");
+    exps.checkAsync("send", send_cb);
+    if (Expecteds::displayErrMsg()) {
+        std::cout << "send: " << exps.getErrMsg() << "\n";
+    }
+
+    // Setup a second timeout.
+    IntervalTimer timer2(service);
+    timeout = false;
+    timer2.setup([&timeout] { timeout = true; }, 100, IntervalTimer::ONE_SHOT);
+
+    // Receive on the server.
+    vector<char> receive_buf(64);
+    TestCallback receive_cb;
+    server.async_read_some(boost::asio::buffer(receive_buf), receive_cb);
+    while (!timeout && !receive_cb.getCalled()) {
+        service.run_one();
+    }
+    timer2.cancel();
+
+    exps.clear();
+    // On Botan and some OpenSSL the receive party hangs.
+    exps.addTimeout();
+    // OpenSSL errors.
+    exps.addError("uninitialized");
+    exps.addError("uninitialized (SSL routines)");
+    exps.addError("uninitialized (SSL routines, ST_BEFORE_ACCEPT)");
+    exps.addError("uninitialized (SSL routines, ssl_read_internal)");
+    exps.checkAsync("receive", receive_cb);
+    if (Expecteds::displayErrMsg()) {
+        if (timeout) {
+            std::cout << "receive timeout\n";
+        } else {
+            std::cout << "receive: " << exps.getErrMsg() << "\n";
+        }
+    }
+
+    // Close client and server.
+    EXPECT_NO_THROW(client.lowest_layer().close());
+    EXPECT_NO_THROW(server.lowest_layer().close());
+}
+
+// Test what happens when the server was not configured.
+TEST(TLSTest, serverNotConfigured) {
+    IOService service;
+
+    // Server part.
+    TlsContextPtr server_ctx(new TlsContext(TlsRole::SERVER));
+    // Skip config.
+    TlsStream<TestCallback> server(service, server_ctx);
+
+    // Accept a client.
+    tcp::endpoint server_ep(tcp::endpoint(address::from_string(SERVER_ADDRESS),
+                                          SERVER_PORT));
+    tcp::acceptor acceptor(service.get_io_service(), server_ep);
+    acceptor.set_option(tcp::acceptor::reuse_address(true));
+    TestCallback accept_cb;
+    acceptor.async_accept(server.lowest_layer(), accept_cb);
+
+    // Client part.
+    TlsContextPtr client_ctx;
+    test::configClient(client_ctx);
+    TlsStream<TestCallback> client(service, client_ctx);
+
+    // Connect to.
+    client.lowest_layer().open(tcp::v4());
+    TestCallback connect_cb;
+    client.lowest_layer().async_connect(server_ep, connect_cb);
+
+    // Run accept and connect.
+    while (!accept_cb.getCalled() || !connect_cb.getCalled()) {
+        service.run_one();
+    }
+
+    // Verify the error codes.
+    if (accept_cb.getCode()) {
+        FAIL() << "accept error " << accept_cb.getCode().value()
+               << " '" << accept_cb.getCode().message() << "'";
+    }
+    // Possible EINPROGRESS for the client.
+    if (connect_cb.getCode() &&
+        (connect_cb.getCode().value() != EINPROGRESS)) {
+        FAIL() << "connect error " << connect_cb.getCode().value()
+               << " '" << connect_cb.getCode().message() << "'";
+    }
+
+    // Setup a timeout.
+    IntervalTimer timer(service);
+    bool timeout = false;
+    timer.setup([&timeout] { timeout = true; }, 100, IntervalTimer::ONE_SHOT);
+
+    // Perform TLS handshakes.
+    TestCallback server_cb;
+    server.handshake(server_cb);
+    TestCallback client_cb;
+    client.handshake(client_cb);
+    while (!timeout && (!server_cb.getCalled() || !client_cb.getCalled())) {
+        service.run_one();
+    }
+    timer.cancel();
+
+    Expecteds exps;
+    // Botan error.
+    exps.addError("handshake_failure");
+    // Old LibreSSL error.
+    exps.addError("no shared cipher");
+    // OpenSSL errors.
+    exps.addError("sslv3 alert handshake failure");
+    exps.addError("no shared cipher (SSL routines)");
+    exps.addError("no shared cipher (SSL routines, ACCEPT_SR_CLNT_HELLO_C)");
+    exps.addError("no shared cipher (SSL routines, tls_post_process_client_hello)");
+    // Recent LibreSSL error.
+    exps.addError("missing rsa certificate (SSL routines, (UNKNOWN)SSL_internal)");
+    exps.checkAsync("server", server_cb);
+    if (Expecteds::displayErrMsg()) {
+        std::cout << "server: " << exps.getErrMsg() << "\n";
+    }
+
+    exps.clear();
+    // On Botan and some OpenSSL the client hangs.
+    exps.addTimeout();
+    // OpenSSL errors.
+    exps.addError("sslv3 alert handshake failure");
+    exps.addError("sslv3 alert handshake failure (SSL routines)");
+    exps.addError("sslv3 alert handshake failure (SSL routines, CONNECT_CR_SRVR_HELLO)");
+    exps.addError("sslv3 alert handshake failure (SSL routines, CONNECT_CR_CERT)");
+    exps.addError("sslv3 alert handshake failure (SSL routines, ssl3_read_bytes)");
+    exps.checkAsync("client", client_cb);
+    if (Expecteds::displayErrMsg()) {
+        if (timeout) {
+            std::cout << "client timeout\n";
+        } else {
+            std::cout << "client: " << exps.getErrMsg() << "\n";
+        }
+    }
+
+    // Close client and server.
+    EXPECT_NO_THROW(client.lowest_layer().close());
+    EXPECT_NO_THROW(server.lowest_layer().close());
+}
+
+// Test what happens when the client was not configured.
+TEST(TLSTest, clientNotConfigured) {
+    IOService service;
+
+    // Server part.
+    TlsContextPtr server_ctx;
+    test::configServer(server_ctx);
+    TlsStream<TestCallback> server(service, server_ctx);
+
+    // Accept a client.
+    tcp::endpoint server_ep(tcp::endpoint(address::from_string(SERVER_ADDRESS),
+                                          SERVER_PORT));
+    tcp::acceptor acceptor(service.get_io_service(), server_ep);
+    acceptor.set_option(tcp::acceptor::reuse_address(true));
+    TestCallback accept_cb;
+    acceptor.async_accept(server.lowest_layer(), accept_cb);
+
+    // Client part.
+    TlsContextPtr client_ctx(new TlsContext(TlsRole::CLIENT));
+    // Skip config.
+    TlsStream<TestCallback> client(service, client_ctx);
+
+    // Connect to.
+    client.lowest_layer().open(tcp::v4());
+    TestCallback connect_cb;
+    client.lowest_layer().async_connect(server_ep, connect_cb);
+
+    // Run accept and connect.
+    while (!accept_cb.getCalled() || !connect_cb.getCalled()) {
+        service.run_one();
+    }
+
+    // Verify the error codes.
+    if (accept_cb.getCode()) {
+        FAIL() << "accept error " << accept_cb.getCode().value()
+               << " '" << accept_cb.getCode().message() << "'";
+    }
+    // Possible EINPROGRESS for the client.
+    if (connect_cb.getCode() &&
+        (connect_cb.getCode().value() != EINPROGRESS)) {
+        FAIL() << "connect error " << connect_cb.getCode().value()
+               << " '" << connect_cb.getCode().message() << "'";
+    }
+
+    // Setup a timeout.
+    IntervalTimer timer(service);
+    bool timeout = false;
+    timer.setup([&timeout] { timeout = true; }, 100, IntervalTimer::ONE_SHOT);
+
+    // Perform TLS handshakes.
+    TestCallback server_cb;
+    server.async_handshake(roleToImpl(TlsRole::SERVER), server_cb);
+    TestCallback client_cb;
+    client.async_handshake(roleToImpl(TlsRole::CLIENT), client_cb);
+    while (!timeout && (!server_cb.getCalled() || !client_cb.getCalled())) {
+        service.run_one();
+    }
+    timer.cancel();
+
+    Expecteds exps;
+    // On Botan and some OpenSSL the server hangs.
+    exps.addTimeout();
+    // OpenSSL errors.
+    exps.addError("tlsv1 alert unknown ca");
+    exps.addError("tlsv1 alert unknown ca (SSL routines)");
+    exps.addError("tlsv1 alert unknown ca (SSL routines, ACCEPT_SR_CERT)");
+    exps.addError("tlsv1 alert unknown ca (SSL routines, ACCEPT_SR_CERT_VRFY)");
+    exps.addError("tlsv1 alert unknown ca (SSL routines, ssl3_read_bytes)");
+    exps.checkAsync("server", server_cb);
+    if (Expecteds::displayErrMsg()) {
+        if (timeout) {
+            std::cout << "server timeout\n";
+        } else {
+            std::cout << "server: " << exps.getErrMsg() << "\n";
+        }
+    }
+
+    exps.clear();
+    // Botan error (unfortunately a bit generic).
+    exps.addError("bad_certificate");
+    // Old LibreSSL error.
+    exps.addError("tlsv1 alert unknown ca");
+    // OpenSSL errors.
+    exps.addError("certificate verify failed");
+    exps.addError("certificate verify failed (SSL routines)");
+    exps.addError("certificate verify failed (SSL routines, CONNECT_CR_CERT)");
+    exps.addError("certificate verify failed (SSL routines, (UNKNOWN)SSL_internal)");
+    exps.addError("certificate verify failed (SSL routines, tls_process_server_certificate)");
+    // The client should not hang.
+    exps.checkAsync("client", client_cb);
+    if (Expecteds::displayErrMsg()) {
+        std::cout << "client: " << exps.getErrMsg() << "\n";
+    }
+
+    // Close client and server.
+    EXPECT_NO_THROW(client.lowest_layer().close());
+    EXPECT_NO_THROW(server.lowest_layer().close());
+}
+
+// Test what happens when the client is HTTP (vs HTTPS).
+TEST(TLSTest, clientHTTPnoS) {
+    IOService service;
+
+    // Server part.
+    TlsContextPtr server_ctx;
+    test::configServer(server_ctx);
+    TlsStream<TestCallback> server(service, server_ctx);
+
+    // Accept a client.
+    tcp::endpoint server_ep(tcp::endpoint(address::from_string(SERVER_ADDRESS),
+                                          SERVER_PORT));
+    tcp::acceptor acceptor(service.get_io_service(), server_ep);
+    acceptor.set_option(tcp::acceptor::reuse_address(true));
+    TestCallback accept_cb;
+    acceptor.async_accept(server.lowest_layer(), accept_cb);
+
+    // Client part.
+    tcp::socket client(service.get_io_service());
+
+    // Connect to.
+    client.open(tcp::v4());
+    TestCallback connect_cb;
+    client.async_connect(server_ep, connect_cb);
+
+    // Run accept and connect.
+    while (!accept_cb.getCalled() || !connect_cb.getCalled()) {
+        service.run_one();
+    }
+
+    // Verify the error codes.
+    if (accept_cb.getCode()) {
+        FAIL() << "accept error " << accept_cb.getCode().value()
+               << " '" << accept_cb.getCode().message() << "'";
+    }
+    // Possible EINPROGRESS for the client.
+    if (connect_cb.getCode() &&
+        (connect_cb.getCode().value() != EINPROGRESS)) {
+        FAIL() << "connect error " << connect_cb.getCode().value()
+               << " '" << connect_cb.getCode().message() << "'";
+    }
+
+    // Setup a timeout.
+    IntervalTimer timer(service);
+    bool timeout = false;
+    timer.setup([&timeout] { timeout = true; }, 100, IntervalTimer::ONE_SHOT);
+
+    // Perform server TLS handshake.
+    TestCallback server_cb;
+    server.async_handshake(roleToImpl(TlsRole::SERVER), server_cb);
+
+    // Client sending a HTTP GET.
+    char send_buf[] = "GET / HTTP/1.1\r\n";
+    TestCallback client_cb;
+    client.async_send(boost::asio::buffer(send_buf), client_cb);
+
+    while (!timeout && (!server_cb.getCalled() || !client_cb.getCalled())) {
+        service.run_one();
+    }
+    timer.cancel();
+
+    Expecteds exps;
+    // Botan server hangs before 2.18.
+    exps.addTimeout();
+    // Botan error.
+    exps.addError("protocol_version");
+    // Old LibreSSL error.
+    exps.addError("tlsv1 alert protocol version");
+    // OpenSSL errors (OpenSSL recognizes HTTP).
+    exps.addError("http request");
+    exps.addError("http request (SSL routines)");
+    exps.addError("http request (SSL routines, ACCEPT_SR_CLNT_HELLO)");
+    exps.addError("http request (SSL routines, ssl3_get_record)");
+    // Another OpenSSL error (not all OpenSSL recognizes HTTP).
+    exps.addError("wrong version number");
+    // Recent LibreSSL error.
+    exps.addError("tlsv1 alert protocol version (SSL routines, ACCEPT_SR_CLNT_HELLO)");
+    exps.checkAsync("server", server_cb);
+    if (Expecteds::displayErrMsg()) {
+        if (timeout) {
+            std::cout << "server timeout\n";
+        } else {
+            std::cout << "server: " << exps.getErrMsg() << "\n";
+        }
+    }
+
+    // No error at the client.
+    EXPECT_TRUE(client_cb.getCalled());
+    EXPECT_FALSE(client_cb.getCode());
+
+    // Close client and server.
+    EXPECT_NO_THROW(client.lowest_layer().close());
+    EXPECT_NO_THROW(server.lowest_layer().close());
+}
+
+// Test what happens when the client does not use HTTP nor HTTP.
+TEST(TLSTest, unknownClient) {
+    IOService service;
+
+    // Server part.
+    TlsContextPtr server_ctx;
+    test::configServer(server_ctx);
+    TlsStream<TestCallback> server(service, server_ctx);
+
+    // Accept a client.
+    tcp::endpoint server_ep(tcp::endpoint(address::from_string(SERVER_ADDRESS),
+                                          SERVER_PORT));
+    tcp::acceptor acceptor(service.get_io_service(), server_ep);
+    acceptor.set_option(tcp::acceptor::reuse_address(true));
+    TestCallback accept_cb;
+    acceptor.async_accept(server.lowest_layer(), accept_cb);
+
+    // Client part.
+    tcp::socket client(service.get_io_service());
+
+    // Connect to.
+    client.open(tcp::v4());
+    TestCallback connect_cb;
+    client.async_connect(server_ep, connect_cb);
+
+    // Run accept and connect.
+    while (!accept_cb.getCalled() || !connect_cb.getCalled()) {
+        service.run_one();
+    }
+
+    // Verify the error codes.
+    if (accept_cb.getCode()) {
+        FAIL() << "accept error " << accept_cb.getCode().value()
+               << " '" << accept_cb.getCode().message() << "'";
+    }
+    // Possible EINPROGRESS for the client.
+    if (connect_cb.getCode() &&
+        (connect_cb.getCode().value() != EINPROGRESS)) {
+        FAIL() << "connect error " << connect_cb.getCode().value()
+               << " '" << connect_cb.getCode().message() << "'";
+    }
+
+    // Setup a timeout.
+    IntervalTimer timer(service);
+    bool timeout = false;
+    timer.setup([&timeout] { timeout = true; }, 100, IntervalTimer::ONE_SHOT);
+
+    // Perform server TLS handshake.
+    TestCallback server_cb;
+    server.async_handshake(roleToImpl(TlsRole::SERVER), server_cb);
+
+    // Client sending something which is not a TLS ClientHello.
+    char send_buf[] = "hello my server...";
+    TestCallback client_cb;
+    client.async_send(boost::asio::buffer(send_buf), client_cb);
+
+    while (!timeout && (!server_cb.getCalled() || !client_cb.getCalled())) {
+        service.run_one();
+    }
+    timer.cancel();
+
+    Expecteds exps;
+    // Botan errors.
+    exps.addError("record_overflow");
+    exps.addError("protocol_version");
+    // Old LibreSSL error.
+    exps.addError("tlsv1 alert protocol version");
+    // Old OpenSSL error.
+    exps.addError("unknown protocol");
+    // Recent OpenSSL errors.
+    exps.addError("wrong version number");
+    exps.addError("wrong version number (SSL routines)");
+    exps.addError("wrong version number (SSL routines, ssl3_get_record)");
+    // Recent LibreSSL error.
+    exps.addError("unknown protocol (SSL routines, ACCEPT_SR_CLNT_HELLO)");
+    exps.addError("tlsv1 alert protocol version (SSL routines, ACCEPT_SR_CLNT_HELLO)");
+    exps.checkAsync("server", server_cb);
+    if (Expecteds::displayErrMsg()) {
+        std::cout << "server: " << exps.getErrMsg() << "\n";
+    }
+
+    // No error on the client side.
+    EXPECT_TRUE(client_cb.getCalled());
+    EXPECT_FALSE(client_cb.getCode());
+
+    // Close client and server.
+    EXPECT_NO_THROW(client.lowest_layer().close());
+    EXPECT_NO_THROW(server.lowest_layer().close());
+}
+
+// Test what happens when the client uses a certificate from another CA.
+TEST(TLSTest, anotherClient) {
+    IOService service;
+
+    // Server part.
+    TlsContextPtr server_ctx;
+    test::configServer(server_ctx);
+    TlsStream<TestCallback> server(service, server_ctx);
+
+    // Accept a client.
+    tcp::endpoint server_ep(tcp::endpoint(address::from_string(SERVER_ADDRESS),
+                                          SERVER_PORT));
+    tcp::acceptor acceptor(service.get_io_service(), server_ep);
+    acceptor.set_option(tcp::acceptor::reuse_address(true));
+    TestCallback accept_cb;
+    acceptor.async_accept(server.lowest_layer(), accept_cb);
+
+    // Client part using a certificate signed by another CA.
+    TlsContextPtr client_ctx;
+    test::configOther(client_ctx);
+    TlsStream<TestCallback> client(service, client_ctx);
+
+    // Connect to.
+    client.lowest_layer().open(tcp::v4());
+    TestCallback connect_cb;
+    client.lowest_layer().async_connect(server_ep, connect_cb);
+
+    // Run accept and connect.
+    while (!accept_cb.getCalled() || !connect_cb.getCalled()) {
+        service.run_one();
+    }
+
+    // Verify the error codes.
+    if (accept_cb.getCode()) {
+        FAIL() << "accept error " << accept_cb.getCode().value()
+               << " '" << accept_cb.getCode().message() << "'";
+    }
+    // Possible EINPROGRESS for the client.
+    if (connect_cb.getCode() &&
+        (connect_cb.getCode().value() != EINPROGRESS)) {
+        FAIL() << "connect error " << connect_cb.getCode().value()
+               << " '" << connect_cb.getCode().message() << "'";
+    }
+
+    // Setup a timeout.
+    IntervalTimer timer(service);
+    bool timeout = false;
+    timer.setup([&timeout] { timeout = true; }, 100, IntervalTimer::ONE_SHOT);
+
+    // Perform TLS handshakes.
+    TestCallback server_cb;
+    server.async_handshake(roleToImpl(TlsRole::SERVER), server_cb);
+    TestCallback client_cb;
+    client.async_handshake(roleToImpl(TlsRole::CLIENT), client_cb);
+    while (!timeout && (!server_cb.getCalled() || !client_cb.getCalled())) {
+        service.run_one();
+    }
+    timer.cancel();
+
+    Expecteds exps;
+    // Botan error.
+    exps.addError("bad_certificate");
+    // Old LibreSSL error.
+    exps.addError("tlsv1 alert unknown ca");
+    // OpenSSL errors.
+    // Full error is:
+    // error 20 at 0 depth lookup:unable to get local issuer certificate
+    exps.addError("certificate verify failed");
+    exps.addError("certificate verify failed (SSL routines)");
+    exps.addError("certificate verify failed (SSL routines, tls_process_client_certificate)");
+    // Recent LibreSSL errors.
+    exps.addError("no certificate returned (SSL routines, ACCEPT_SR_CERT)");
+    exps.addError("certificate verify failed (SSL routines, (UNKNOWN)SSL_internal)");
+    exps.checkAsync("server", server_cb);
+    if (Expecteds::displayErrMsg()) {
+        std::cout << "server: " << exps.getErrMsg() << "\n";
+    }
+
+    exps.clear();
+    // Botan client hangs.
+    exps.addTimeout();
+    // Old LibreSSL and recent OpenSSL do not fail.
+    exps.addNoError();
+    // Old OpenSSL error.
+    exps.addError("tlsv1 alert unknown ca");
+    // Recent LibreSSL error.
+    exps.addError("tlsv1 alert unknown ca (SSL routines, CONNECT_CR_SESSION_TICKET)");
+    exps.checkAsync("client", client_cb);
+    if (Expecteds::displayErrMsg()) {
+        if (timeout) {
+            std::cout << "client timeout\n";
+        } else if (exps.hasErrMsg()) {
+            std::cout << "client: " << exps.getErrMsg() << "\n";
+        }
+    }
+
+    // Close client and server.
+    EXPECT_NO_THROW(client.lowest_layer().close());
+    EXPECT_NO_THROW(server.lowest_layer().close());
+}
+
+// Test what happens when the client uses a self-signed certificate.
+TEST(TLSTest, selfSigned) {
+    IOService service;
+
+    // Server part.
+    TlsContextPtr server_ctx;
+    test::configServer(server_ctx);
+    TlsStream<TestCallback> server(service, server_ctx);
+
+    // Accept a client.
+    tcp::endpoint server_ep(tcp::endpoint(address::from_string(SERVER_ADDRESS),
+                                          SERVER_PORT));
+    tcp::acceptor acceptor(service.get_io_service(), server_ep);
+    acceptor.set_option(tcp::acceptor::reuse_address(true));
+    TestCallback accept_cb;
+    acceptor.async_accept(server.lowest_layer(), accept_cb);
+
+    // Client part using a self-signed certificate.
+    TlsContextPtr client_ctx;
+    test::configSelf(client_ctx);
+    TlsStream<TestCallback> client(service, client_ctx);
+
+    // Connect to.
+    client.lowest_layer().open(tcp::v4());
+    TestCallback connect_cb;
+    client.lowest_layer().async_connect(server_ep, connect_cb);
+
+    // Run accept and connect.
+    while (!accept_cb.getCalled() || !connect_cb.getCalled()) {
+        service.run_one();
+    }
+
+    // Verify the error codes.
+    if (accept_cb.getCode()) {
+        FAIL() << "accept error " << accept_cb.getCode().value()
+               << " '" << accept_cb.getCode().message() << "'";
+    }
+    // Possible EINPROGRESS for the client.
+    if (connect_cb.getCode() &&
+        (connect_cb.getCode().value() != EINPROGRESS)) {
+        FAIL() << "connect error " << connect_cb.getCode().value()
+               << " '" << connect_cb.getCode().message() << "'";
+    }
+
+    // Setup a timeout.
+    IntervalTimer timer(service);
+    bool timeout = false;
+    timer.setup([&timeout] { timeout = true; }, 100, IntervalTimer::ONE_SHOT);
+
+    // Perform TLS handshakes.
+    TestCallback server_cb;
+    server.async_handshake(roleToImpl(TlsRole::SERVER), server_cb);
+    TestCallback client_cb;
+    client.async_handshake(roleToImpl(TlsRole::CLIENT), client_cb);
+    while (!timeout && (!server_cb.getCalled() || !client_cb.getCalled())) {
+        service.run_one();
+    }
+    timer.cancel();
+
+    Expecteds exps;
+    // Botan error.
+    exps.addError("bad_certificate");
+    // Old LibreSSL error.
+    exps.addError("tlsv1 alert unknown ca");
+    // OpenSSL errors.
+    // Full error is:
+    // error 18 at 0 depth lookup:self signed certificate
+    exps.addError("certificate verify failed");
+    exps.addError("certificate verify failed (SSL routines)");
+    exps.addError("certificate verify failed (SSL routines, tls_process_client_certificate)");
+    // Recent LibreSSL errors.
+    exps.addError("no certificate returned (SSL routines, ACCEPT_SR_CERT)");
+    exps.addError("certificate verify failed (SSL routines, (UNKNOWN)SSL_internal)");
+    exps.checkAsync("server", server_cb);
+    if (Expecteds::displayErrMsg()) {
+        std::cout << "server: " << exps.getErrMsg() << "\n";
+    }
+
+    exps.clear();
+    // Botan client hangs.
+    exps.addTimeout();
+    // Old LibreSSL and recent OpenSSL do not fail.
+    exps.addNoError();
+    // Old OpenSSL error.
+    exps.addError("tlsv1 alert unknown ca");
+    // Recent LibreSSL error.
+    exps.addError("tlsv1 alert unknown ca (SSL routines, CONNECT_CR_SESSION_TICKET)");
+    exps.checkAsync("client", client_cb);
+    if (Expecteds::displayErrMsg()) {
+        if (timeout) {
+            std::cout << "client timeout\n";
+        } else if (exps.hasErrMsg()) {
+            std::cout << "client: " << exps.getErrMsg() << "\n";
+        }
+    }
+
+    // Close client and server.
+    EXPECT_NO_THROW(client.lowest_layer().close());
+    EXPECT_NO_THROW(server.lowest_layer().close());
+}
+
+////////////////////////////////////////////////////////////////////////
+//                  Close on error handshake failures                 //
+////////////////////////////////////////////////////////////////////////
+
+// Investigate what happens when a peer closes its streams when the
+// handshake callback returns an error. In particular does still
+// the other peer timeout?
+
+// Test what happens when handshake is forgotten.
+TEST(TLSTest, noHandshakeCloseonError) {
+    IOService service;
+
+    // Server part.
+    TlsContextPtr server_ctx;
+    test::configServer(server_ctx);
+    TlsStream<TestCallback> server(service, server_ctx);
+
+    // Accept a client.
+    tcp::endpoint server_ep(tcp::endpoint(address::from_string(SERVER_ADDRESS),
+                                          SERVER_PORT));
+    tcp::acceptor acceptor(service.get_io_service(), server_ep);
+    acceptor.set_option(tcp::acceptor::reuse_address(true));
+    TestCallback accept_cb;
+    acceptor.async_accept(server.lowest_layer(), accept_cb);
+
+    // Client part.
+    TlsContextPtr client_ctx;
+    test::configClient(client_ctx);
+    TlsStream<TestCallback> client(service, client_ctx);
+
+    // Connect to.
+    client.lowest_layer().open(tcp::v4());
+    TestCallback connect_cb;
+    client.lowest_layer().async_connect(server_ep, connect_cb);
+
+    // Run accept and connect.
+    while (!accept_cb.getCalled() || !connect_cb.getCalled()) {
+        service.run_one();
+    }
+
+    // Verify the error codes.
+    if (accept_cb.getCode()) {
+        FAIL() << "accept error " << accept_cb.getCode().value()
+               << " '" << accept_cb.getCode().message() << "'";
+    }
+    // Possible EINPROGRESS for the client.
+    if (connect_cb.getCode() &&
+        (connect_cb.getCode().value() != EINPROGRESS)) {
+        FAIL() << "connect error " << connect_cb.getCode().value()
+               << " '" << connect_cb.getCode().message() << "'";
+    }
+
+    // Setup a timeout.
+    IntervalTimer timer1(service);
+    bool timeout = false;
+    timer1.setup([&timeout] { timeout = true; }, 100, IntervalTimer::ONE_SHOT);
+
+    // Send on the client.
+    char send_buf[] = "some text...";
+    TestCallback send_cb(&client.lowest_layer());
+    async_write(client, boost::asio::buffer(send_buf), send_cb);
+    while (!timeout && !send_cb.getCalled()) {
+        service.run_one();
+    }
+    timer1.cancel();
+
+    Expecteds exps;
+    // Botan error.
+    exps.addError("InvalidObjectState");
+    // OpenSSL errors.
+    exps.addError("uninitialized");
+    exps.addError("uninitialized (SSL routines)");
+    exps.addError("uninitialized (SSL routines, ST_BEFORE_ACCEPT)");
+    exps.addError("uninitialized (SSL routines, ssl_write_internal)");
+    exps.checkAsync("send", send_cb);
+    if (Expecteds::displayErrMsg()) {
+        std::cout << "send: " << exps.getErrMsg() << "\n";
+    }
+
+    // Setup a second timeout.
+    IntervalTimer timer2(service);
+    timeout = false;
+    timer2.setup([&timeout] { timeout = true; }, 100, IntervalTimer::ONE_SHOT);
+
+    // Receive on the server.
+    vector<char> receive_buf(64);
+    TestCallback receive_cb;
+    server.async_read_some(boost::asio::buffer(receive_buf), receive_cb);
+    while (!timeout && !receive_cb.getCalled()) {
+        service.run_one();
+    }
+    timer2.cancel();
+
+    exps.clear();
+    // Botan and some OpenSSL.
+    exps.addError("stream truncated");
+    // OpenSSL errors.
+    exps.addError("uninitialized");
+    exps.addError("uninitialized (SSL routines)");
+    exps.addError("uninitialized (SSL routines, ST_BEFORE_ACCEPT)");
+    exps.addError("uninitialized (SSL routines, ssl_read_internal)");
+    exps.checkAsync("receive", receive_cb);
+    if (Expecteds::displayErrMsg()) {
+        std::cout << "receive: " << exps.getErrMsg() << "\n";
+    }
+
+    // Close client and server.
+    EXPECT_NO_THROW(client.lowest_layer().close());
+    EXPECT_NO_THROW(server.lowest_layer().close());
+}
+
+// Test what happens when the server was not configured.
+TEST(TLSTest, serverNotConfiguredCloseonError) {
+    IOService service;
+
+    // Server part.
+    TlsContextPtr server_ctx(new TlsContext(TlsRole::SERVER));
+    // Skip config.
+    TlsStream<TestCallback> server(service, server_ctx);
+
+    // Accept a client.
+    tcp::endpoint server_ep(tcp::endpoint(address::from_string(SERVER_ADDRESS),
+                                          SERVER_PORT));
+    tcp::acceptor acceptor(service.get_io_service(), server_ep);
+    acceptor.set_option(tcp::acceptor::reuse_address(true));
+    TestCallback accept_cb;
+    acceptor.async_accept(server.lowest_layer(), accept_cb);
+
+    // Client part.
+    TlsContextPtr client_ctx;
+    test::configClient(client_ctx);
+    TlsStream<TestCallback> client(service, client_ctx);
+
+    // Connect to.
+    client.lowest_layer().open(tcp::v4());
+    TestCallback connect_cb;
+    client.lowest_layer().async_connect(server_ep, connect_cb);
+
+    // Run accept and connect.
+    while (!accept_cb.getCalled() || !connect_cb.getCalled()) {
+        service.run_one();
+    }
+
+    // Verify the error codes.
+    if (accept_cb.getCode()) {
+        FAIL() << "accept error " << accept_cb.getCode().value()
+               << " '" << accept_cb.getCode().message() << "'";
+    }
+    // Possible EINPROGRESS for the client.
+    if (connect_cb.getCode() &&
+        (connect_cb.getCode().value() != EINPROGRESS)) {
+        FAIL() << "connect error " << connect_cb.getCode().value()
+               << " '" << connect_cb.getCode().message() << "'";
+    }
+
+    // Setup a timeout.
+    IntervalTimer timer(service);
+    bool timeout = false;
+    timer.setup([&timeout] { timeout = true; }, 100, IntervalTimer::ONE_SHOT);
+
+    // Perform TLS handshakes.
+    TestCallback server_cb(&server.lowest_layer());
+    server.handshake(server_cb);
+    TestCallback client_cb;
+    client.handshake(client_cb);
+    while (!timeout && (!server_cb.getCalled() || !client_cb.getCalled())) {
+        service.run_one();
+    }
+    timer.cancel();
+
+    Expecteds exps;
+    // Botan error.
+    exps.addError("handshake_failure");
+    // Old LibreSSL error.
+    exps.addError("no shared cipher");
+    // OpenSSL errors.
+    exps.addError("sslv3 alert handshake failure");
+    exps.addError("no shared cipher (SSL routines)");
+    exps.addError("no shared cipher (SSL routines, ACCEPT_SR_CLNT_HELLO_C)");
+    exps.addError("no shared cipher (SSL routines, tls_post_process_client_hello)");
+    // Recent LibreSSL error.
+    exps.addError("missing rsa certificate (SSL routines, (UNKNOWN)SSL_internal)");
+    exps.checkAsync("server", server_cb);
+    if (Expecteds::displayErrMsg()) {
+        std::cout << "server: " << exps.getErrMsg() << "\n";
+    }
+
+    exps.clear();
+    // Botan and some OpenSSL.
+    exps.addError("stream truncated");
+    // Alias on old OpenSSL.
+    exps.addError("short read");
+    // OpenSSL errors.
+    exps.addError("sslv3 alert handshake failure");
+    exps.addError("sslv3 alert handshake failure (SSL routines)");
+    exps.addError("sslv3 alert handshake failure (SSL routines, CONNECT_CR_SRVR_HELLO)");
+    exps.addError("sslv3 alert handshake failure (SSL routines, ssl3_read_bytes)");
+    // Recent LibreSSL error.
+    exps.addError("sslv3 alert handshake failure (SSL routines, CONNECT_CR_CERT)");
+    exps.checkAsync("client", client_cb);
+    if (Expecteds::displayErrMsg()) {
+        std::cout << "client: " << exps.getErrMsg() << "\n";
+    }
+
+    // Close client and server.
+    EXPECT_NO_THROW(client.lowest_layer().close());
+    EXPECT_NO_THROW(server.lowest_layer().close());
+}
+
+// Test what happens when the client was not configured.
+TEST(TLSTest, clientNotConfiguredCloseonError) {
+    IOService service;
+
+    // Server part.
+    TlsContextPtr server_ctx;
+    test::configServer(server_ctx);
+    TlsStream<TestCallback> server(service, server_ctx);
+
+    // Accept a client.
+    tcp::endpoint server_ep(tcp::endpoint(address::from_string(SERVER_ADDRESS),
+                                          SERVER_PORT));
+    tcp::acceptor acceptor(service.get_io_service(), server_ep);
+    acceptor.set_option(tcp::acceptor::reuse_address(true));
+    TestCallback accept_cb;
+    acceptor.async_accept(server.lowest_layer(), accept_cb);
+
+    // Client part.
+    TlsContextPtr client_ctx(new TlsContext(TlsRole::CLIENT));
+    // Skip config.
+    TlsStream<TestCallback> client(service, client_ctx);
+
+    // Connect to.
+    client.lowest_layer().open(tcp::v4());
+    TestCallback connect_cb;
+    client.lowest_layer().async_connect(server_ep, connect_cb);
+
+    // Run accept and connect.
+    while (!accept_cb.getCalled() || !connect_cb.getCalled()) {
+        service.run_one();
+    }
+
+    // Verify the error codes.
+    if (accept_cb.getCode()) {
+        FAIL() << "accept error " << accept_cb.getCode().value()
+               << " '" << accept_cb.getCode().message() << "'";
+    }
+    // Possible EINPROGRESS for the client.
+    if (connect_cb.getCode() &&
+        (connect_cb.getCode().value() != EINPROGRESS)) {
+        FAIL() << "connect error " << connect_cb.getCode().value()
+               << " '" << connect_cb.getCode().message() << "'";
+    }
+
+    // Setup a timeout.
+    IntervalTimer timer(service);
+    bool timeout = false;
+    timer.setup([&timeout] { timeout = true; }, 100, IntervalTimer::ONE_SHOT);
+
+    // Perform TLS handshakes.
+    TestCallback server_cb;
+    server.async_handshake(roleToImpl(TlsRole::SERVER), server_cb);
+    TestCallback client_cb(&client.lowest_layer());
+    client.async_handshake(roleToImpl(TlsRole::CLIENT), client_cb);
+    while (!timeout && (!server_cb.getCalled() || !client_cb.getCalled())) {
+        service.run_one();
+    }
+    timer.cancel();
+
+    Expecteds exps;
+    // Botan and some OpenSSL.
+    exps.addError("stream truncated");
+    // Alias on old OpenSSL.
+    exps.addError("short read");
+    // OpenSSL errors.
+    exps.addError("tlsv1 alert unknown ca");
+    exps.addError("tlsv1 alert unknown ca (SSL routines)");
+    exps.addError("tlsv1 alert unknown ca (SSL routines, ACCEPT_SR_CERT)");
+    exps.addError("tlsv1 alert unknown ca (SSL routines, ACCEPT_SR_CERT_VRFY)");
+    exps.addError("tlsv1 alert unknown ca (SSL routines, ssl3_read_bytes)");
+    exps.checkAsync("server", server_cb);
+    if (Expecteds::displayErrMsg()) {
+        std::cout << "server: " << exps.getErrMsg() << "\n";
+    }
+
+    exps.clear();
+    // Botan error (unfortunately a bit generic).
+    exps.addError("bad_certificate");
+    // Old LibreSSL error.
+    exps.addError("tlsv1 alert unknown ca");
+    // OpenSSL errors.
+    exps.addError("certificate verify failed");
+    exps.addError("certificate verify failed (SSL routines)");
+    exps.addError("certificate verify failed (SSL routines, CONNECT_CR_CERT)");
+    exps.addError("certificate verify failed (SSL routines, tls_process_server_certificate)");
+    // Recent LibreSSL error.
+    exps.addError("certificate verify failed (SSL routines, (UNKNOWN)SSL_internal)");
+    // The client should not hang.
+    exps.checkAsync("client", client_cb);
+    if (Expecteds::displayErrMsg()) {
+        std::cout << "client: " << exps.getErrMsg() << "\n";
+    }
+
+    // Close client and server.
+    EXPECT_NO_THROW(client.lowest_layer().close());
+    EXPECT_NO_THROW(server.lowest_layer().close());
+}
+
+// Test what happens when the client is HTTP (vs HTTPS).
+TEST(TLSTest, clientHTTPnoSCloseonError) {
+    IOService service;
+
+    // Server part.
+    TlsContextPtr server_ctx;
+    test::configServer(server_ctx);
+    TlsStream<TestCallback> server(service, server_ctx);
+
+    // Accept a client.
+    tcp::endpoint server_ep(tcp::endpoint(address::from_string(SERVER_ADDRESS),
+                                          SERVER_PORT));
+    tcp::acceptor acceptor(service.get_io_service(), server_ep);
+    acceptor.set_option(tcp::acceptor::reuse_address(true));
+    TestCallback accept_cb;
+    acceptor.async_accept(server.lowest_layer(), accept_cb);
+
+    // Client part.
+    tcp::socket client(service.get_io_service());
+
+    // Connect to.
+    client.open(tcp::v4());
+    TestCallback connect_cb;
+    client.async_connect(server_ep, connect_cb);
+
+    // Run accept and connect.
+    while (!accept_cb.getCalled() || !connect_cb.getCalled()) {
+        service.run_one();
+    }
+
+    // Verify the error codes.
+    if (accept_cb.getCode()) {
+        FAIL() << "accept error " << accept_cb.getCode().value()
+               << " '" << accept_cb.getCode().message() << "'";
+    }
+    // Possible EINPROGRESS for the client.
+    if (connect_cb.getCode() &&
+        (connect_cb.getCode().value() != EINPROGRESS)) {
+        FAIL() << "connect error " << connect_cb.getCode().value()
+               << " '" << connect_cb.getCode().message() << "'";
+    }
+
+    // Setup a timeout.
+    IntervalTimer timer(service);
+    bool timeout = false;
+    timer.setup([&timeout] { timeout = true; }, 100, IntervalTimer::ONE_SHOT);
+
+    // Perform server TLS handshake.
+    TestCallback server_cb;
+    server.async_handshake(roleToImpl(TlsRole::SERVER), server_cb);
+
+    // Client sending a HTTP GET.
+    char send_buf[] = "GET / HTTP/1.1\r\n";
+    TestCallback client_cb;
+    client.async_send(boost::asio::buffer(send_buf), client_cb);
+
+    while (!timeout && (!server_cb.getCalled() || !client_cb.getCalled())) {
+        service.run_one();
+    }
+    timer.cancel();
+
+    Expecteds exps;
+    // Botan server hangs before 2.18.
+    exps.addTimeout();
+    // Botan behavior was reported and fixed.
+    exps.addError("protocol_version");
+    // Old LibreSSL error.
+    exps.addError("tlsv1 alert protocol version");
+    // OpenSSL errors when OpenSSL recognizes HTTP.
+    exps.addError("http request");
+    exps.addError("http request (SSL routines)");
+    exps.addError("http request (SSL routines, ACCEPT_SR_CLNT_HELLO)");
+    exps.addError("http request (SSL routines, ssl3_get_record)");
+    // Another OpenSSL error (not all OpenSSL recognizes HTTP).
+    exps.addError("wrong version number");
+    // Recent LibreSSL error.
+    exps.addError("tlsv1 alert protocol version (SSL routines, ACCEPT_SR_CLNT_HELLO)");
+    exps.checkAsync("server", server_cb);
+    if (Expecteds::displayErrMsg()) {
+        if (timeout) {
+            std::cout << "server timeout\n";
+        } else {
+            std::cout << "server: " << exps.getErrMsg() << "\n";
+        }
+    }
+
+    // No error at the client.
+    EXPECT_TRUE(client_cb.getCalled());
+    EXPECT_FALSE(client_cb.getCode());
+
+    // Close client and server.
+    EXPECT_NO_THROW(client.lowest_layer().close());
+    EXPECT_NO_THROW(server.lowest_layer().close());
+}
+
+// Test what happens when the client uses a certificate from another CA.
+TEST(TLSTest, anotherClientCloseonError) {
+    IOService service;
+
+    // Server part.
+    TlsContextPtr server_ctx;
+    test::configServer(server_ctx);
+    TlsStream<TestCallback> server(service, server_ctx);
+
+    // Accept a client.
+    tcp::endpoint server_ep(tcp::endpoint(address::from_string(SERVER_ADDRESS),
+                                          SERVER_PORT));
+    tcp::acceptor acceptor(service.get_io_service(), server_ep);
+    acceptor.set_option(tcp::acceptor::reuse_address(true));
+    TestCallback accept_cb;
+    acceptor.async_accept(server.lowest_layer(), accept_cb);
+
+    // Client part using a certificate signed by another CA.
+    TlsContextPtr client_ctx;
+    test::configOther(client_ctx);
+    TlsStream<TestCallback> client(service, client_ctx);
+
+    // Connect to.
+    client.lowest_layer().open(tcp::v4());
+    TestCallback connect_cb;
+    client.lowest_layer().async_connect(server_ep, connect_cb);
+
+    // Run accept and connect.
+    while (!accept_cb.getCalled() || !connect_cb.getCalled()) {
+        service.run_one();
+    }
+
+    // Verify the error codes.
+    if (accept_cb.getCode()) {
+        FAIL() << "accept error " << accept_cb.getCode().value()
+               << " '" << accept_cb.getCode().message() << "'";
+    }
+    // Possible EINPROGRESS for the client.
+    if (connect_cb.getCode() &&
+        (connect_cb.getCode().value() != EINPROGRESS)) {
+        FAIL() << "connect error " << connect_cb.getCode().value()
+               << " '" << connect_cb.getCode().message() << "'";
+    }
+
+    // Setup a timeout.
+    IntervalTimer timer(service);
+    bool timeout = false;
+    timer.setup([&timeout] { timeout = true; }, 100, IntervalTimer::ONE_SHOT);
+
+    // Perform TLS handshakes.
+    TestCallback server_cb(&server.lowest_layer());
+    server.async_handshake(roleToImpl(TlsRole::SERVER), server_cb);
+    TestCallback client_cb;
+    client.async_handshake(roleToImpl(TlsRole::CLIENT), client_cb);
+    while (!timeout && (!server_cb.getCalled() || !client_cb.getCalled())) {
+        service.run_one();
+    }
+    timer.cancel();
+
+    Expecteds exps;
+    // Botan error.
+    exps.addError("bad_certificate");
+    // Old LibreSSL error.
+    exps.addError("tlsv1 alert unknown ca");
+    // OpenSSL errors.
+    // Full error is:
+    // error 20 at 0 depth lookup:unable to get local issuer certificate
+    exps.addError("certificate verify failed");
+    exps.addError("certificate verify failed (SSL routines)");
+    exps.addError("certificate verify failed (SSL routines, tls_process_client_certificate)");
+    // Recent LibreSSL errors.
+    exps.addError("no certificate returned (SSL routines, ACCEPT_SR_CERT)");
+    exps.addError("certificate verify failed (SSL routines, (UNKNOWN)SSL_internal)");
+    exps.checkAsync("server", server_cb);
+    if (Expecteds::displayErrMsg()) {
+        std::cout << "server: " << exps.getErrMsg() << "\n";
+    }
+
+    exps.clear();
+    // Botan and some OpenSSL.
+    exps.addError("stream truncated");
+    // Alias on old OpenSSL.
+    exps.addError("short read");
+    // Old LibreSSL and recent OpenSSL do not fail.
+    exps.addNoError();
+    // Old OpenSSL error.
+    exps.addError("tlsv1 alert unknown ca");
+    // Recent LibreSSL error.
+    exps.addError("tlsv1 alert unknown ca (SSL routines, CONNECT_CR_SESSION_TICKET)");
+    exps.checkAsync("client", client_cb);
+    if (Expecteds::displayErrMsg() && exps.hasErrMsg()) {
+        std::cout << "client: " << exps.getErrMsg() << "\n";
+    }
+
+    // Close client and server.
+    EXPECT_NO_THROW(client.lowest_layer().close());
+    EXPECT_NO_THROW(server.lowest_layer().close());
+}
+
+// Test what happens when the client uses a self-signed certificate.
+TEST(TLSTest, selfSignedCloseonError) {
+    IOService service;
+
+    // Server part.
+    TlsContextPtr server_ctx;
+    test::configServer(server_ctx);
+    TlsStream<TestCallback> server(service, server_ctx);
+
+    // Accept a client.
+    tcp::endpoint server_ep(tcp::endpoint(address::from_string(SERVER_ADDRESS),
+                                          SERVER_PORT));
+    tcp::acceptor acceptor(service.get_io_service(), server_ep);
+    acceptor.set_option(tcp::acceptor::reuse_address(true));
+    TestCallback accept_cb;
+    acceptor.async_accept(server.lowest_layer(), accept_cb);
+
+    // Client part using a self-signed certificate.
+    TlsContextPtr client_ctx;
+    test::configSelf(client_ctx);
+    TlsStream<TestCallback> client(service, client_ctx);
+
+    // Connect to.
+    client.lowest_layer().open(tcp::v4());
+    TestCallback connect_cb;
+    client.lowest_layer().async_connect(server_ep, connect_cb);
+
+    // Run accept and connect.
+    while (!accept_cb.getCalled() || !connect_cb.getCalled()) {
+        service.run_one();
+    }
+
+    // Verify the error codes.
+    if (accept_cb.getCode()) {
+        FAIL() << "accept error " << accept_cb.getCode().value()
+               << " '" << accept_cb.getCode().message() << "'";
+    }
+    // Possible EINPROGRESS for the client.
+    if (connect_cb.getCode() &&
+        (connect_cb.getCode().value() != EINPROGRESS)) {
+        FAIL() << "connect error " << connect_cb.getCode().value()
+               << " '" << connect_cb.getCode().message() << "'";
+    }
+
+    // Setup a timeout.
+    IntervalTimer timer(service);
+    bool timeout = false;
+    timer.setup([&timeout] { timeout = true; }, 100, IntervalTimer::ONE_SHOT);
+
+    // Perform TLS handshakes.
+    TestCallback server_cb(&server.lowest_layer());
+    server.async_handshake(roleToImpl(TlsRole::SERVER), server_cb);
+    TestCallback client_cb;
+    client.async_handshake(roleToImpl(TlsRole::CLIENT), client_cb);
+    while (!timeout && (!server_cb.getCalled() || !client_cb.getCalled())) {
+        service.run_one();
+    }
+    timer.cancel();
+
+    Expecteds exps;
+    // Botan error.
+    exps.addError("bad_certificate");
+    // Old LibreSSL error.
+    exps.addError("tlsv1 alert unknown ca");
+    // OpenSSL errors.
+    // Full error is:
+    // error 18 at 0 depth lookup:self signed certificate
+    exps.addError("certificate verify failed");
+    exps.addError("certificate verify failed (SSL routines)");
+    exps.addError("certificate verify failed (SSL routines, tls_process_client_certificate)");
+    // Recent LibreSSL errors.
+    exps.addError("no certificate returned (SSL routines, ACCEPT_SR_CERT)");
+    exps.addError("certificate verify failed (SSL routines, (UNKNOWN)SSL_internal)");
+    exps.checkAsync("server", server_cb);
+    if (Expecteds::displayErrMsg()) {
+        std::cout << "server: " << exps.getErrMsg() << "\n";
+    }
+
+    exps.clear();
+    // Botan and some OpenSSL.
+    exps.addError("stream truncated");
+    // Alias on old OpenSSL.
+    exps.addError("short read");
+    // Old LibreSSL and recent OpenSSL do not fail.
+    exps.addNoError();
+    // Old OpenSSL error.
+    exps.addError("tlsv1 alert unknown ca");
+    // Recent LibreSSL error.
+    exps.addError("tlsv1 alert unknown ca (SSL routines, CONNECT_CR_SESSION_TICKET)");
+    exps.checkAsync("client", client_cb);
+    if (Expecteds::displayErrMsg() && exps.hasErrMsg()) {
+        std::cout << "client: " << exps.getErrMsg() << "\n";
+    }
+
+    // Close client and server.
+    EXPECT_NO_THROW(client.lowest_layer().close());
+    EXPECT_NO_THROW(server.lowest_layer().close());
+}
+
+////////////////////////////////////////////////////////////////////////
+//                      TLS handshake corner case                     //
+////////////////////////////////////////////////////////////////////////
+
+// Some special cases.
+
+// Test what happens when the client uses a certificate from another CA
+// but the client certificate request and validation are disabled.
+TEST(TLSTest, anotherClientNoReq) {
+    IOService service;
+
+    // Server part.
+    TlsContextPtr server_ctx;
+    test::configServerNoReq(server_ctx);
+    TlsStream<TestCallback> server(service, server_ctx);
+
+    // Accept a client.
+    tcp::endpoint server_ep(tcp::endpoint(address::from_string(SERVER_ADDRESS),
+                                          SERVER_PORT));
+    tcp::acceptor acceptor(service.get_io_service(), server_ep);
+    acceptor.set_option(tcp::acceptor::reuse_address(true));
+    TestCallback accept_cb;
+    acceptor.async_accept(server.lowest_layer(), accept_cb);
+
+    // Client part using a certificate signed by another CA.
+    TlsContextPtr client_ctx;
+    test::configOther(client_ctx);
+    TlsStream<TestCallback> client(service, client_ctx);
+
+    // Connect to.
+    client.lowest_layer().open(tcp::v4());
+    TestCallback connect_cb;
+    client.lowest_layer().async_connect(server_ep, connect_cb);
+
+    // Run accept and connect.
+    while (!accept_cb.getCalled() || !connect_cb.getCalled()) {
+        service.run_one();
+    }
+
+    // Verify the error codes.
+    if (accept_cb.getCode()) {
+        FAIL() << "accept error " << accept_cb.getCode().value()
+               << " '" << accept_cb.getCode().message() << "'";
+    }
+    // Possible EINPROGRESS for the client.
+    if (connect_cb.getCode() &&
+        (connect_cb.getCode().value() != EINPROGRESS)) {
+        FAIL() << "connect error " << connect_cb.getCode().value()
+               << " '" << connect_cb.getCode().message() << "'";
+    }
+
+    // Setup a timeout.
+    IntervalTimer timer(service);
+    bool timeout = false;
+    timer.setup([&timeout] { timeout = true; }, 100, IntervalTimer::ONE_SHOT);
+
+    // Perform TLS handshakes.
+    TestCallback server_cb;
+    server.async_handshake(roleToImpl(TlsRole::SERVER), server_cb);
+    TestCallback client_cb;
+    client.async_handshake(roleToImpl(TlsRole::CLIENT), client_cb);
+    while (!timeout && (!server_cb.getCalled() || !client_cb.getCalled())) {
+        service.run_one();
+    }
+    timer.cancel();
+
+    // Should not fail.
+    EXPECT_FALSE(timeout);
+    EXPECT_TRUE(server_cb.getCalled());
+    EXPECT_FALSE(server_cb.getCode());
+    EXPECT_TRUE(client_cb.getCalled());
+    EXPECT_FALSE(client_cb.getCode());
+
+    // Close client and server.
+    EXPECT_NO_THROW(client.lowest_layer().close());
+    EXPECT_NO_THROW(server.lowest_layer().close());
+}
+
+// Test what happens when the server uses a certificate without subject
+// alternative name (but still a version 3 certificate).
+TEST(TLSTest, serverRaw) {
+    IOService service;
+
+    // Server part.
+    TlsContextPtr server_ctx;
+    test::configServerRaw(server_ctx);
+    TlsStream<TestCallback> server(service, server_ctx);
+
+    // Accept a client.
+    tcp::endpoint server_ep(tcp::endpoint(address::from_string(SERVER_ADDRESS),
+                                          SERVER_PORT));
+    tcp::acceptor acceptor(service.get_io_service(), server_ep);
+    acceptor.set_option(tcp::acceptor::reuse_address(true));
+    TestCallback accept_cb;
+    acceptor.async_accept(server.lowest_layer(), accept_cb);
+
+    // Client part.
+    TlsContextPtr client_ctx;
+    test::configClient(client_ctx);
+    TlsStream<TestCallback> client(service, client_ctx);
+
+    // Connect to.
+    client.lowest_layer().open(tcp::v4());
+    TestCallback connect_cb;
+    client.lowest_layer().async_connect(server_ep, connect_cb);
+
+    // Run accept and connect.
+    while (!accept_cb.getCalled() || !connect_cb.getCalled()) {
+        service.run_one();
+    }
+
+    // Verify the error codes.
+    if (accept_cb.getCode()) {
+        FAIL() << "accept error " << accept_cb.getCode().value()
+               << " '" << accept_cb.getCode().message() << "'";
+    }
+    // Possible EINPROGRESS for the client.
+    if (connect_cb.getCode() &&
+        (connect_cb.getCode().value() != EINPROGRESS)) {
+        FAIL() << "connect error " << connect_cb.getCode().value()
+               << " '" << connect_cb.getCode().message() << "'";
+    }
+
+    // Setup a timeout.
+    IntervalTimer timer(service);
+    bool timeout = false;
+    timer.setup([&timeout] { timeout = true; }, 100, IntervalTimer::ONE_SHOT);
+
+    // Perform TLS handshakes.
+    TestCallback server_cb;
+    server.async_handshake(roleToImpl(TlsRole::SERVER), server_cb);
+    TestCallback client_cb;
+    client.async_handshake(roleToImpl(TlsRole::CLIENT), client_cb);
+    while (!timeout && (!server_cb.getCalled() || !client_cb.getCalled())) {
+        service.run_one();
+    }
+    timer.cancel();
+
+    // Should not fail.
+    EXPECT_FALSE(timeout);
+    EXPECT_TRUE(server_cb.getCalled());
+    EXPECT_FALSE(server_cb.getCode());
+    EXPECT_TRUE(client_cb.getCalled());
+    EXPECT_FALSE(client_cb.getCode());
+
+    // Close client and server.
+    EXPECT_NO_THROW(client.lowest_layer().close());
+    EXPECT_NO_THROW(server.lowest_layer().close());
+}
+
+#ifdef WITH_OPENSSL
+// Test what happens when the client uses a trusted self-signed certificate.
+// Not really a failure case as it works...
+TEST(TLSTest, trustedSelfSigned) {
+    IOService service;
+
+    // Server part.
+    TlsContextPtr server_ctx;
+    test::configTrustedSelf(server_ctx);
+    TlsStream<TestCallback> server(service, server_ctx);
+
+    // Accept a client.
+    tcp::endpoint server_ep(tcp::endpoint(address::from_string(SERVER_ADDRESS),
+                                          SERVER_PORT));
+    tcp::acceptor acceptor(service.get_io_service(), server_ep);
+    acceptor.set_option(tcp::acceptor::reuse_address(true));
+    TestCallback accept_cb;
+    acceptor.async_accept(server.lowest_layer(), accept_cb);
+
+    // Client part using a self-signed certificate.
+    TlsContextPtr client_ctx;
+    test::configSelf(client_ctx);
+    TlsStream<TestCallback> client(service, client_ctx);
+
+    // Connect to.
+    client.lowest_layer().open(tcp::v4());
+    TestCallback connect_cb;
+    client.lowest_layer().async_connect(server_ep, connect_cb);
+
+    // Run accept and connect.
+    while (!accept_cb.getCalled() || !connect_cb.getCalled()) {
+        service.run_one();
+    }
+
+    // Verify the error codes.
+    if (accept_cb.getCode()) {
+        FAIL() << "accept error " << accept_cb.getCode().value()
+               << " '" << accept_cb.getCode().message() << "'";
+    }
+    // Possible EINPROGRESS for the client.
+    if (connect_cb.getCode() &&
+        (connect_cb.getCode().value() != EINPROGRESS)) {
+        FAIL() << "connect error " << connect_cb.getCode().value()
+               << " '" << connect_cb.getCode().message() << "'";
+    }
+
+    // Setup a timeout.
+    IntervalTimer timer(service);
+    bool timeout = false;
+    timer.setup([&timeout] { timeout = true; }, 100, IntervalTimer::ONE_SHOT);
+
+    // Perform TLS handshakes.
+    TestCallback server_cb;
+    server.async_handshake(roleToImpl(TlsRole::SERVER), server_cb);
+    TestCallback client_cb;
+    client.async_handshake(roleToImpl(TlsRole::CLIENT), client_cb);
+    while (!timeout && (!server_cb.getCalled() || !client_cb.getCalled())) {
+        service.run_one();
+    }
+    timer.cancel();
+
+    // It should work for all OpenSSL.
+    EXPECT_FALSE(timeout);
+    EXPECT_TRUE(server_cb.getCalled());
+    EXPECT_FALSE(server_cb.getCode());
+    EXPECT_TRUE(client_cb.getCalled());
+    EXPECT_FALSE(client_cb.getCode());
+
+    // Close client and server.
+    EXPECT_NO_THROW(client.lowest_layer().close());
+    EXPECT_NO_THROW(server.lowest_layer().close());
+}
+#endif // WITH_OPENSSL
+
+////////////////////////////////////////////////////////////////////////
+//                              TLS shutdown                          //
+////////////////////////////////////////////////////////////////////////
+
+// Investigate the TLS shutdown processing.
+
+// Test what happens when the shutdown receiver is inactive.
+TEST(TLSTest, shutdownInactive) {
+    IOService service;
+
+    // Server part.
+    TlsContextPtr server_ctx(new TlsContext(TlsRole::SERVER));
+    test::configServer(server_ctx);
+    TlsStream<TestCallback> server(service, server_ctx);
+
+    // Accept a client.
+    tcp::endpoint server_ep(tcp::endpoint(address::from_string(SERVER_ADDRESS),
+                                          SERVER_PORT));
+    tcp::acceptor acceptor(service.get_io_service(), server_ep);
+    acceptor.set_option(tcp::acceptor::reuse_address(true));
+    TestCallback accept_cb;
+    acceptor.async_accept(server.lowest_layer(), accept_cb);
+
+    // Client part.
+    TlsContextPtr client_ctx;
+    test::configClient(client_ctx);
+    TlsStream<TestCallback> client(service, client_ctx);
+
+    // Connect to.
+    client.lowest_layer().open(tcp::v4());
+    TestCallback connect_cb;
+    client.lowest_layer().async_connect(server_ep, connect_cb);
+
+    // Run accept and connect.
+    while (!accept_cb.getCalled() || !connect_cb.getCalled()) {
+        service.run_one();
+    }
+
+    // Verify the error codes.
+    if (accept_cb.getCode()) {
+        FAIL() << "accept error " << accept_cb.getCode().value()
+               << " '" << accept_cb.getCode().message() << "'";
+    }
+    // Possible EINPROGRESS for the client.
+    if (connect_cb.getCode() &&
+        (connect_cb.getCode().value() != EINPROGRESS)) {
+        FAIL() << "connect error " << connect_cb.getCode().value()
+               << " '" << connect_cb.getCode().message() << "'";
+    }
+
+    // Setup a timeout.
+    IntervalTimer timer(service);
+    bool timeout = false;
+    timer.setup([&timeout] { timeout = true; }, 100, IntervalTimer::ONE_SHOT);
+
+    // Perform TLS handshakes.
+    TestCallback server_cb(&server.lowest_layer());
+    server.handshake(server_cb);
+    TestCallback client_cb;
+    client.handshake(client_cb);
+    while (!timeout && (!server_cb.getCalled() || !client_cb.getCalled())) {
+        service.run_one();
+    }
+    timer.cancel();
+
+    // No problem is expected.
+    EXPECT_FALSE(timeout);
+    EXPECT_TRUE(server_cb.getCalled());
+    EXPECT_FALSE(server_cb.getCode());
+    EXPECT_TRUE(client_cb.getCalled());
+    EXPECT_FALSE(client_cb.getCode());
+
+    // Setup a timeout for the shutdown.
+    IntervalTimer timer2(service);
+    timeout = false;
+    timer2.setup([&timeout] { timeout = true; }, 100, IntervalTimer::ONE_SHOT);
+
+    // Shutdown on the client leaving the server inactive.
+    TestCallback shutdown_cb;
+    client.shutdown(shutdown_cb);
+    while (!timeout && !shutdown_cb.getCalled()) {
+        service.run_one();
+    }
+    timer2.cancel();
+
+    Expecteds exps;
+    // Botan gets no error.
+    exps.addNoError();
+    // OpenSSL hangs.
+    exps.addTimeout();
+    exps.checkAsync("shutdown", shutdown_cb);
+    if (Expecteds::displayErrMsg()) {
+        if (timeout) {
+            std::cout << "shutdown timeout\n";
+        } else if (exps.hasErrMsg()) {
+            std::cout << "shutdown: " << exps.getErrMsg() << "\n";
+        }
+    }
+
+    // Close client and server.
+    EXPECT_NO_THROW(client.lowest_layer().close());
+    EXPECT_NO_THROW(server.lowest_layer().close());
+}
+
+// Test what happens when the shutdown receiver is active.
+TEST(TLSTest, shutdownActive) {
+    IOService service;
+
+    // Server part.
+    TlsContextPtr server_ctx(new TlsContext(TlsRole::SERVER));
+    test::configServer(server_ctx);
+    TlsStream<TestCallback> server(service, server_ctx);
+
+    // Accept a client.
+    tcp::endpoint server_ep(tcp::endpoint(address::from_string(SERVER_ADDRESS),
+                                          SERVER_PORT));
+    tcp::acceptor acceptor(service.get_io_service(), server_ep);
+    acceptor.set_option(tcp::acceptor::reuse_address(true));
+    TestCallback accept_cb;
+    acceptor.async_accept(server.lowest_layer(), accept_cb);
+
+    // Client part.
+    TlsContextPtr client_ctx;
+    test::configClient(client_ctx);
+    TlsStream<TestCallback> client(service, client_ctx);
+
+    // Connect to.
+    client.lowest_layer().open(tcp::v4());
+    TestCallback connect_cb;
+    client.lowest_layer().async_connect(server_ep, connect_cb);
+
+    // Run accept and connect.
+    while (!accept_cb.getCalled() || !connect_cb.getCalled()) {
+        service.run_one();
+    }
+
+    // Verify the error codes.
+    if (accept_cb.getCode()) {
+        FAIL() << "accept error " << accept_cb.getCode().value()
+               << " '" << accept_cb.getCode().message() << "'";
+    }
+    // Possible EINPROGRESS for the client.
+    if (connect_cb.getCode() &&
+        (connect_cb.getCode().value() != EINPROGRESS)) {
+        FAIL() << "connect error " << connect_cb.getCode().value()
+               << " '" << connect_cb.getCode().message() << "'";
+    }
+
+    // Setup a timeout.
+    IntervalTimer timer(service);
+    bool timeout = false;
+    timer.setup([&timeout] { timeout = true; }, 100, IntervalTimer::ONE_SHOT);
+
+    // Perform TLS handshakes.
+    TestCallback server_cb(&server.lowest_layer());
+    server.handshake(server_cb);
+    TestCallback client_cb;
+    client.handshake(client_cb);
+    while (!timeout && (!server_cb.getCalled() || !client_cb.getCalled())) {
+        service.run_one();
+    }
+    timer.cancel();
+
+    // No problem is expected.
+    EXPECT_FALSE(timeout);
+    EXPECT_TRUE(server_cb.getCalled());
+    EXPECT_FALSE(server_cb.getCode());
+    EXPECT_TRUE(client_cb.getCalled());
+    EXPECT_FALSE(client_cb.getCode());
+
+    // Setup a timeout for the shutdown and receive.
+    IntervalTimer timer2(service);
+    timeout = false;
+    timer2.setup([&timeout] { timeout = true; }, 100, IntervalTimer::ONE_SHOT);
+
+    // Receive on the server.
+    vector<char> receive_buf(64);
+    TestCallback receive_cb;
+    server.async_read_some(boost::asio::buffer(receive_buf), receive_cb);
+
+    // Shutdown on the client.
+    TestCallback shutdown_cb;
+    client.shutdown(shutdown_cb);
+    while (!timeout && (!shutdown_cb.getCalled() || !receive_cb.getCalled())) {
+        service.run_one();
+    }
+    timer2.cancel();
+
+    Expecteds exps;
+    // Botan gets no error.
+    exps.addNoError();
+    // OpenSSL hangs.
+    exps.addTimeout();
+    exps.checkAsync("shutdown", shutdown_cb);
+    if (Expecteds::displayErrMsg()) {
+        if (timeout) {
+            std::cout << "shutdown timeout\n";
+        } else if (exps.hasErrMsg()) {
+            std::cout << "shutdown: " << exps.getErrMsg() << "\n";
+        }
+    }
+
+    exps.clear();
+    // End of file on the receive side.
+    exps.addError("End of file");
+    exps.checkAsync("receive", receive_cb);
+    if (Expecteds::displayErrMsg()) {
+        std::cout << "receive: " << exps.getErrMsg() << "\n";
+    }
+
+    // Close client and server.
+    EXPECT_NO_THROW(client.lowest_layer().close());
+    EXPECT_NO_THROW(server.lowest_layer().close());
+}
+
+// Test what happens when the shutdown receiver is inactive on shutdown
+// and immediate close.
+TEST(TLSTest, shutdownCloseInactive) {
+    IOService service;
+
+    // Server part.
+    TlsContextPtr server_ctx(new TlsContext(TlsRole::SERVER));
+    test::configServer(server_ctx);
+    TlsStream<TestCallback> server(service, server_ctx);
+
+    // Accept a client.
+    tcp::endpoint server_ep(tcp::endpoint(address::from_string(SERVER_ADDRESS),
+                                          SERVER_PORT));
+    tcp::acceptor acceptor(service.get_io_service(), server_ep);
+    acceptor.set_option(tcp::acceptor::reuse_address(true));
+    TestCallback accept_cb;
+    acceptor.async_accept(server.lowest_layer(), accept_cb);
+
+    // Client part.
+    TlsContextPtr client_ctx;
+    test::configClient(client_ctx);
+    TlsStream<TestCallback> client(service, client_ctx);
+
+    // Connect to.
+    client.lowest_layer().open(tcp::v4());
+    TestCallback connect_cb;
+    client.lowest_layer().async_connect(server_ep, connect_cb);
+
+    // Run accept and connect.
+    while (!accept_cb.getCalled() || !connect_cb.getCalled()) {
+        service.run_one();
+    }
+
+    // Verify the error codes.
+    if (accept_cb.getCode()) {
+        FAIL() << "accept error " << accept_cb.getCode().value()
+               << " '" << accept_cb.getCode().message() << "'";
+    }
+    // Possible EINPROGRESS for the client.
+    if (connect_cb.getCode() &&
+        (connect_cb.getCode().value() != EINPROGRESS)) {
+        FAIL() << "connect error " << connect_cb.getCode().value()
+               << " '" << connect_cb.getCode().message() << "'";
+    }
+
+    // Setup a timeout.
+    IntervalTimer timer(service);
+    bool timeout = false;
+    timer.setup([&timeout] { timeout = true; }, 100, IntervalTimer::ONE_SHOT);
+
+    // Perform TLS handshakes.
+    TestCallback server_cb(&server.lowest_layer());
+    server.handshake(server_cb);
+    TestCallback client_cb;
+    client.handshake(client_cb);
+    while (!timeout && (!server_cb.getCalled() || !client_cb.getCalled())) {
+        service.run_one();
+    }
+    timer.cancel();
+
+    // No problem is expected.
+    EXPECT_FALSE(timeout);
+    EXPECT_TRUE(server_cb.getCalled());
+    EXPECT_FALSE(server_cb.getCode());
+    EXPECT_TRUE(client_cb.getCalled());
+    EXPECT_FALSE(client_cb.getCode());
+
+    // Setup a timeout for the shutdown.
+    IntervalTimer timer2(service);
+    timeout = false;
+    timer2.setup([&timeout] { timeout = true; }, 100, IntervalTimer::ONE_SHOT);
+
+    // Shutdown on the client leaving the server inactive.
+    TestCallback shutdown_cb;
+    client.shutdown(shutdown_cb);
+
+    // Post a close which should be called after the shutdown.
+    service.post([&client] { client.lowest_layer().close(); });
+    while (!timeout && !shutdown_cb.getCalled()) {
+        service.run_one();
+    }
+    timer2.cancel();
+
+    Expecteds exps;
+    // Botan gets no error.
+    exps.addNoError();
+    // LibreSSL and some old OpenSSL gets Operation canceled.
+    exps.addError("Operation canceled");
+    // OpenSSL gets Bad file descriptor.
+    exps.addError("Bad file descriptor");
+    exps.checkAsync("shutdown", shutdown_cb);
+    if (Expecteds::displayErrMsg()) {
+        if (timeout) {
+            std::cout << "shutdown timeout\n";
+        } else if (exps.hasErrMsg()) {
+            std::cout << "shutdown: " << exps.getErrMsg() << "\n";
+        }
+    }
+
+    // Close client and server.
+    EXPECT_NO_THROW(client.lowest_layer().close());
+    EXPECT_NO_THROW(server.lowest_layer().close());
+}
+
+// Test what happens when the shutdown receiver is active with an
+// immediate close.
+TEST(TLSTest, shutdownCloseActive) {
+    IOService service;
+
+    // Server part.
+    TlsContextPtr server_ctx(new TlsContext(TlsRole::SERVER));
+    test::configServer(server_ctx);
+    TlsStream<TestCallback> server(service, server_ctx);
+
+    // Accept a client.
+    tcp::endpoint server_ep(tcp::endpoint(address::from_string(SERVER_ADDRESS),
+                                          SERVER_PORT));
+    tcp::acceptor acceptor(service.get_io_service(), server_ep);
+    acceptor.set_option(tcp::acceptor::reuse_address(true));
+    TestCallback accept_cb;
+    acceptor.async_accept(server.lowest_layer(), accept_cb);
+
+    // Client part.
+    TlsContextPtr client_ctx;
+    test::configClient(client_ctx);
+    TlsStream<TestCallback> client(service, client_ctx);
+
+    // Connect to.
+    client.lowest_layer().open(tcp::v4());
+    TestCallback connect_cb;
+    client.lowest_layer().async_connect(server_ep, connect_cb);
+
+    // Run accept and connect.
+    while (!accept_cb.getCalled() || !connect_cb.getCalled()) {
+        service.run_one();
+    }
+
+    // Verify the error codes.
+    if (accept_cb.getCode()) {
+        FAIL() << "accept error " << accept_cb.getCode().value()
+               << " '" << accept_cb.getCode().message() << "'";
+    }
+    // Possible EINPROGRESS for the client.
+    if (connect_cb.getCode() &&
+        (connect_cb.getCode().value() != EINPROGRESS)) {
+        FAIL() << "connect error " << connect_cb.getCode().value()
+               << " '" << connect_cb.getCode().message() << "'";
+    }
+
+    // Setup a timeout.
+    IntervalTimer timer(service);
+    bool timeout = false;
+    timer.setup([&timeout] { timeout = true; }, 100, IntervalTimer::ONE_SHOT);
+
+    // Perform TLS handshakes.
+    TestCallback server_cb(&server.lowest_layer());
+    server.handshake(server_cb);
+    TestCallback client_cb;
+    client.handshake(client_cb);
+    while (!timeout && (!server_cb.getCalled() || !client_cb.getCalled())) {
+        service.run_one();
+    }
+    timer.cancel();
+
+    // No problem is expected.
+    EXPECT_FALSE(timeout);
+    EXPECT_TRUE(server_cb.getCalled());
+    EXPECT_FALSE(server_cb.getCode());
+    EXPECT_TRUE(client_cb.getCalled());
+    EXPECT_FALSE(client_cb.getCode());
+
+    // Setup a timeout for the shutdown and receive.
+    IntervalTimer timer2(service);
+    timeout = false;
+    timer2.setup([&timeout] { timeout = true; }, 100, IntervalTimer::ONE_SHOT);
+
+    // Receive on the server.
+    vector<char> receive_buf(64);
+    TestCallback receive_cb;
+    server.async_read_some(boost::asio::buffer(receive_buf), receive_cb);
+
+    // Shutdown on the client.
+    TestCallback shutdown_cb;
+    client.shutdown(shutdown_cb);
+
+    // Post a close which should be called after the shutdown.
+    service.post([&client] { client.lowest_layer().close(); });
+    while (!timeout && (!shutdown_cb.getCalled() || !receive_cb.getCalled())) {
+        service.run_one();
+    }
+    timer2.cancel();
+
+    Expecteds exps;
+    // Botan gets no error.
+    exps.addNoError();
+    // LibreSSL and some old OpenSSL gets Operation canceled.
+    exps.addError("Operation canceled");
+    // OpenSSL gets Bad file descriptor.
+    exps.addError("Bad file descriptor");
+    exps.checkAsync("shutdown", shutdown_cb);
+    if (Expecteds::displayErrMsg()) {
+        if (timeout) {
+            std::cout << "shutdown timeout\n";
+        } else if (exps.hasErrMsg()) {
+            std::cout << "shutdown: " << exps.getErrMsg() << "\n";
+        }
+    }
+
+    // End of file on the receive side.
+    EXPECT_TRUE(receive_cb.getCalled());
+    EXPECT_TRUE(receive_cb.getCode());
+    EXPECT_EQ("End of file", receive_cb.getCode().message());
+    if (Expecteds::displayErrMsg()) {
+        std::cout << "receive: " << receive_cb.getCode().message() << "\n";
+    }
+
+    // Close client and server.
+    EXPECT_NO_THROW(client.lowest_layer().close());
+    EXPECT_NO_THROW(server.lowest_layer().close());
+}
+
+// Conclusion about the shutdown: do the close on completion (e.g. in the
+// handler) or on timeout (i.e. simulate an asynchronous shutdown with
+// timeout).
+
+} // end of anonymous namespace.
diff --git a/src/lib/asiolink/tests/udp_endpoint_unittest.cc b/src/lib/asiolink/tests/udp_endpoint_unittest.cc
new file mode 100644
index 0000000..cf932f1
--- /dev/null
+++ b/src/lib/asiolink/tests/udp_endpoint_unittest.cc
@@ -0,0 +1,46 @@
+// Copyright (C) 2011-2016 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <asiolink/asio_wrapper.h>
+#include <asiolink/io_address.h>
+#include <asiolink/udp_endpoint.h>
+
+#include <gtest/gtest.h>
+
+#include <string>
+
+using namespace isc::asiolink;
+using namespace std;
+
+// This test checks that the endpoint can manage its own internal
+// boost::asio::ip::udp::endpoint object.
+
+TEST(UDPEndpointTest, v4Address) {
+    const string test_address("192.0.2.1");
+    const unsigned short test_port = 5301;
+
+    IOAddress address(test_address);
+    UDPEndpoint endpoint(address, test_port);
+
+    EXPECT_TRUE(address == endpoint.getAddress());
+    EXPECT_EQ(test_port, endpoint.getPort());
+    EXPECT_EQ(static_cast<short>(IPPROTO_UDP), endpoint.getProtocol());
+    EXPECT_EQ(AF_INET, endpoint.getFamily());
+}
+
+TEST(UDPEndpointTest, v6Address) {
+    const string test_address("2001:db8::1235");
+    const unsigned short test_port = 5302;
+
+    IOAddress address(test_address);
+    UDPEndpoint endpoint(address, test_port);
+
+    EXPECT_TRUE(address == endpoint.getAddress());
+    EXPECT_EQ(test_port, endpoint.getPort());
+    EXPECT_EQ(static_cast<short>(IPPROTO_UDP), endpoint.getProtocol());
+    EXPECT_EQ(AF_INET6, endpoint.getFamily());
+}
diff --git a/src/lib/asiolink/tests/udp_socket_unittest.cc b/src/lib/asiolink/tests/udp_socket_unittest.cc
new file mode 100644
index 0000000..1fb9616
--- /dev/null
+++ b/src/lib/asiolink/tests/udp_socket_unittest.cc
@@ -0,0 +1,324 @@
+// Copyright (C) 2011-2020 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+/// \brief Test of UDPSocket
+///
+/// Tests the functionality of a UDPSocket by working through an open-send-
+/// receive-close sequence and checking that the asynchronous notifications
+/// work.
+
+#include <config.h>
+#include <asiolink/asio_wrapper.h>
+#include <asiolink/io_service.h>
+#include <asiolink/udp_endpoint.h>
+#include <asiolink/udp_socket.h>
+#include <util/buffer.h>
+#include <util/io_utilities.h>
+
+#include <boost/shared_ptr.hpp>
+#include <gtest/gtest.h>
+
+#include <string>
+#include <arpa/inet.h>
+#include <netinet/in.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <algorithm>
+#include <cstdlib>
+#include <cstddef>
+#include <vector>
+
+
+using namespace boost::asio;
+using namespace isc::util;
+using namespace isc::asiolink;
+using namespace std;
+
+namespace {
+
+const char SERVER_ADDRESS[] = "127.0.0.1";
+const unsigned short SERVER_PORT = 5301;
+
+// TODO: Shouldn't we send something that is real message?
+const char OUTBOUND_DATA[] = "Data sent from client to server";
+const char INBOUND_DATA[] = "Returned data from server to client";
+}
+
+///
+/// An instance of this object is passed to the asynchronous I/O functions
+/// and the operator() method is called when when an asynchronous I/O
+/// completes.  The arguments to the completion callback are stored for later
+/// retrieval.
+class UDPCallback {
+public:
+
+    struct PrivateData {
+        PrivateData() :
+            error_code_(), length_(0), called_(false), name_("")
+        {}
+
+        boost::system::error_code  error_code_;    ///< Completion error code
+        size_t                     length_;        ///< Number of bytes transferred
+        bool                       called_;        ///< Set true when callback called
+        std::string                name_;          ///< Which of the objects this is
+    };
+
+    /// \brief Constructor
+    ///
+    /// Constructs the object.  It also creates the data member pointed to by
+    /// a shared pointer.  When used as a callback object, this is copied as it
+    /// is passed into the asynchronous function.  This means that there are two
+    /// objects and inspecting the one we passed in does not tell us anything.
+    ///
+    /// Therefore we use a boost::shared_ptr.  When the object is copied, the
+    /// shared pointer is copied, which leaves both objects pointing to the same
+    /// data.
+    ///
+    /// \param which Which of the two callback objects this is
+    UDPCallback(const std::string& which) : ptr_(new PrivateData())
+    {
+        setName(which);
+    }
+
+    /// \brief Destructor
+    ///
+    /// No code needed, destroying the shared pointer destroys the private data.
+    virtual ~UDPCallback()
+    {}
+
+    /// \brief Callback Function
+    ///
+    /// Called when an asynchronous I/O completes, this stores the
+    /// completion error code and the number of bytes transferred.
+    ///
+    /// \param ec I/O completion error code passed to callback function.
+    /// \param length Number of bytes transferred
+    virtual void operator()(boost::system::error_code ec, size_t length = 0) {
+        ptr_->error_code_ = ec;
+        setLength(length);
+        setCalled(true);
+    }
+
+    /// \brief Get I/O completion error code
+    int getCode() {
+        return (ptr_->error_code_.value());
+    }
+
+    /// \brief Set I/O completion code
+    ///
+    /// \param code New value of completion code
+    void setCode(int code) {
+        ptr_->error_code_ = boost::system::error_code(code, boost::system::error_code().category());
+    }
+
+    /// \brief Get number of bytes transferred in I/O
+    size_t getLength() const {
+        return (ptr_->length_);
+    }
+
+    /// \brief Set number of bytes transferred in I/O
+    ///
+    /// \param length New value of length parameter
+    void setLength(size_t length) {
+        ptr_->length_ = length;
+    }
+
+    /// \brief Get flag to say when callback was called
+    bool getCalled() const {
+        return (ptr_->called_);
+    }
+
+    /// \brief Set flag to say when callback was called
+    ///
+    /// \param called New value of called parameter
+    void setCalled(bool called) {
+        ptr_->called_ = called;
+    }
+
+    /// \brief Return instance of callback name
+    std::string getName() const {
+        return (ptr_->name_);
+    }
+
+    /// \brief Set callback name
+    ///
+    /// \param name New value of the callback name
+    void setName(const std::string& name) {
+        ptr_->name_ = name;
+    }
+
+private:
+    boost::shared_ptr<PrivateData>  ptr_;   ///< Pointer to private data
+};
+
+// Receive complete method should return true regardless of what is in the first
+// two bytes of a buffer.
+
+TEST(UDPSocket, processReceivedData) {
+    IOService               service;        // Used to instantiate socket
+    UDPSocket<UDPCallback>  test(service);  // Socket under test
+    uint8_t                 inbuff[32];     // Buffer to check
+    OutputBufferPtr         outbuff(new OutputBuffer(16));
+                                            // Where data is put
+                                            // cppcheck-suppress variableScope
+    size_t                  expected;       // Expected amount of data
+                                            // cppcheck-suppress variableScope
+    size_t                  offset;         // Where to put next data
+                                            // cppcheck-suppress variableScope
+    size_t                  cumulative;     // Cumulative data received
+
+    // Set some dummy values in the buffer to check
+    for (uint8_t i = 0; i < sizeof(inbuff); ++i) {
+        inbuff[i] = i;
+    }
+
+    // Expect that the value is true whatever number is written in the first
+    // two bytes of the buffer.
+    uint16_t count = 0;
+    for (uint32_t i = 0; i < (2 << 16); ++i, ++count) {
+        writeUint16(count, inbuff, sizeof(inbuff));
+
+        // Set some random values
+        cumulative = 5;
+        offset = 10;
+        expected = 15;
+        outbuff->clear();
+
+        bool completed = test.processReceivedData(inbuff, sizeof(inbuff),
+                                                  cumulative, offset, expected,
+                                                  outbuff);
+        EXPECT_TRUE(completed);
+        EXPECT_EQ(sizeof(inbuff), cumulative);
+        EXPECT_EQ(0, offset);
+        EXPECT_EQ(sizeof(inbuff), expected);
+
+        const uint8_t* dataptr = static_cast<const uint8_t*>(outbuff->getData());
+        EXPECT_TRUE(equal(inbuff, inbuff + sizeof(inbuff) - 1, dataptr));
+    }
+}
+
+// TODO: Need to add a test to check the cancel() method
+
+// Tests the operation of a UDPSocket by opening it, sending an asynchronous
+// message to a server, receiving an asynchronous message from the server and
+// closing.
+TEST(UDPSocket, SequenceTest) {
+
+    // Common objects.
+    IOService   service;                    // Service object for async control
+
+    // Server
+    IOAddress   server_address(SERVER_ADDRESS); // Address of target server
+    UDPCallback server_cb("Server");        // Server callback
+    UDPEndpoint server_endpoint(            // Endpoint describing server
+        server_address, SERVER_PORT);
+    UDPEndpoint server_remote_endpoint;     // Address where server received message from
+
+    // The client - the UDPSocket being tested
+    UDPSocket<UDPCallback>  client(service);// Socket under test
+    UDPCallback client_cb("Client");        // Async I/O callback function
+    UDPEndpoint client_remote_endpoint;     // Where client receives message from
+    size_t      client_cumulative = 0;      // Cumulative data received
+    size_t      client_offset = 0;          // Offset into buffer where data is put
+    size_t      client_expected = 0;        // Expected amount of data
+    OutputBufferPtr client_buffer(new OutputBuffer(16));
+                                            // Where data is put
+
+    // The server - with which the client communicates.  For convenience, we
+    // use the same io_service, and use the endpoint object created for
+    // the client to send to as the endpoint object in the constructor.
+    boost::asio::ip::udp::socket server(service.get_io_service(),
+        server_endpoint.getASIOEndpoint());
+    server.set_option(socket_base::reuse_address(true));
+
+    // Assertion to ensure that the server buffer is large enough
+    char data[UDPSocket<UDPCallback>::MIN_SIZE];
+    ASSERT_GT(sizeof(data), sizeof(OUTBOUND_DATA));
+
+    // Open the client socket - the operation should be synchronous
+    EXPECT_TRUE(client.isOpenSynchronous());
+    client.open(&server_endpoint, client_cb);
+
+    // Issue read on the server.  Completion callback should not have run.
+    server_cb.setCalled(false);
+    server_cb.setCode(42); // Answer to Life, the Universe and Everything!
+    server.async_receive_from(buffer(data, sizeof(data)),
+        server_remote_endpoint.getASIOEndpoint(), server_cb);
+    EXPECT_FALSE(server_cb.getCalled());
+
+    // Write something to the server using the client - the callback should not
+    // be called until we call the io_service.run() method.
+    client_cb.setCalled(false);
+    client_cb.setCode(7);  // Arbitrary number
+    client.asyncSend(OUTBOUND_DATA, sizeof(OUTBOUND_DATA), &server_endpoint, client_cb);
+    EXPECT_FALSE(client_cb.getCalled());
+
+    // Execute the two callbacks.
+    service.run_one();
+    service.run_one();
+
+    EXPECT_TRUE(client_cb.getCalled());
+    EXPECT_EQ(0, client_cb.getCode());
+    EXPECT_EQ(sizeof(OUTBOUND_DATA), client_cb.getLength());
+
+    EXPECT_TRUE(server_cb.getCalled());
+    EXPECT_EQ(0, server_cb.getCode());
+    EXPECT_EQ(sizeof(OUTBOUND_DATA), server_cb.getLength());
+
+    EXPECT_TRUE(equal(&data[0], &data[server_cb.getLength() - 1], OUTBOUND_DATA));
+
+    // Now return data from the server to the client.  Issue the read on the
+    // client.
+    client_cb.setLength(12345);             // Arbitrary number
+    client_cb.setCalled(false);
+    client_cb.setCode(32);                  // Arbitrary number
+    client.asyncReceive(data, sizeof(data), client_cumulative,
+        &client_remote_endpoint, client_cb);
+
+    // Issue the write on the server side to the source of the data it received.
+    server_cb.setLength(22345);             // Arbitrary number
+    server_cb.setCalled(false);
+    server_cb.setCode(232);                 // Arbitrary number
+    server.async_send_to(buffer(INBOUND_DATA, sizeof(INBOUND_DATA)),
+        server_remote_endpoint.getASIOEndpoint(), server_cb);
+
+    // Expect two callbacks to run.
+    service.run_one();
+    service.run_one();
+
+    EXPECT_TRUE(client_cb.getCalled());
+    EXPECT_EQ(0, client_cb.getCode());
+    EXPECT_EQ(sizeof(INBOUND_DATA), client_cb.getLength());
+
+    EXPECT_TRUE(server_cb.getCalled());
+    EXPECT_EQ(0, server_cb.getCode());
+    EXPECT_EQ(sizeof(INBOUND_DATA), server_cb.getLength());
+
+    EXPECT_TRUE(equal(&data[0], &data[server_cb.getLength() - 1], INBOUND_DATA));
+
+    // Check that the address/port received by the client corresponds to the
+    // address and port the server is listening on.
+    EXPECT_TRUE(server_address == client_remote_endpoint.getAddress());
+    EXPECT_EQ(SERVER_PORT, client_remote_endpoint.getPort());
+
+    // Check that the receive received a complete buffer's worth of data.
+    EXPECT_TRUE(client.processReceivedData(&data[0], client_cb.getLength(),
+                                           client_cumulative, client_offset,
+                                           client_expected, client_buffer));
+
+    EXPECT_EQ(client_cb.getLength(), client_cumulative);
+    EXPECT_EQ(0, client_offset);
+    EXPECT_EQ(client_cb.getLength(), client_expected);
+    EXPECT_EQ(client_cb.getLength(), client_buffer->getLength());
+
+    // ...and check that the data was copied to the output client buffer.
+    const char* client_char_data = static_cast<const char*>(client_buffer->getData());
+    EXPECT_TRUE(equal(&data[0], &data[client_cb.getLength() - 1], client_char_data));
+
+    // Close client and server.
+    EXPECT_NO_THROW(client.close());
+    EXPECT_NO_THROW(server.close());
+}
diff --git a/src/lib/asiolink/tests/unix_domain_socket_unittest.cc b/src/lib/asiolink/tests/unix_domain_socket_unittest.cc
new file mode 100644
index 0000000..31c573d
--- /dev/null
+++ b/src/lib/asiolink/tests/unix_domain_socket_unittest.cc
@@ -0,0 +1,310 @@
+// Copyright (C) 2017-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <asiolink/asio_wrapper.h>
+#include <asiolink/io_service.h>
+#include <asiolink/unix_domain_socket.h>
+#include <asiolink/testutils/test_server_unix_socket.h>
+#include <gtest/gtest.h>
+#include <testutils/sandbox.h>
+#include <array>
+#include <cstdio>
+#include <cstdlib>
+#include <sstream>
+#include <string>
+
+using namespace isc::asiolink;
+
+namespace  {
+
+/// @brief Test timeout in ms.
+const long TEST_TIMEOUT = 10000;
+
+/// @brief Test fixture class for @ref UnixDomainSocket class.
+class UnixDomainSocketTest : public ::testing::Test {
+public:
+    isc::test::Sandbox sandbox;
+
+    /// @brief Constructor.
+    ///
+    /// Removes unix socket descriptor before the test.
+    UnixDomainSocketTest() :
+        io_service_(),
+        test_socket_(new test::TestServerUnixSocket(io_service_,
+                                                    unixSocketFilePath())),
+        response_(),
+        read_buf_() {
+        test_socket_->startTimer(TEST_TIMEOUT);
+        removeUnixSocketFile();
+    }
+
+    /// @brief Destructor.
+    ///
+    /// Removes unix socket descriptor after the test.
+    virtual ~UnixDomainSocketTest() {
+        removeUnixSocketFile();
+    }
+
+    /// @brief Returns socket file path.
+    ///
+    /// If the KEA_SOCKET_TEST_DIR environment variable is specified, the
+    /// socket file is created in the location pointed to by this variable.
+    /// Otherwise, it is created in the build directory.
+    std::string unixSocketFilePath() {
+        std::string socket_path;
+        const char* env = getenv("KEA_SOCKET_TEST_DIR");
+        if (env) {
+            socket_path = std::string(env) + "/test-socket";
+        } else {
+            socket_path = sandbox.join("test-socket");
+        }
+        return (socket_path);
+    }
+
+    /// @brief Removes unix socket descriptor.
+    void removeUnixSocketFile() {
+        static_cast<void>(remove(unixSocketFilePath().c_str()));
+    }
+
+    /// @brief Performs asynchronous receive on unix domain socket.
+    ///
+    /// This function performs partial read from the unix domain socket.
+    /// It uses @c read_buf_ or small size to ensure that the buffer fills
+    /// in before all that have been read. The partial responses are
+    /// appended to the @c response_ class member.
+    ///
+    /// If the response received so far is shorter than the expected
+    /// response, another partial read is scheduled.
+    ///
+    /// @param socket Reference to the unix domain socket.
+    /// @param expected_response Expected response.
+    void doReceive(UnixDomainSocket& socket,
+                   const std::string& expected_response) {
+        socket.asyncReceive(&read_buf_[0], read_buf_.size(),
+        [this, &socket, expected_response]
+            (const boost::system::error_code& ec, size_t length) {
+            if (!ec) {
+                // Append partial response received and see if the
+                // size of the response received so far is still
+                // smaller than expected. If it is, schedule another
+                // partial read.
+                response_.append(&read_buf_[0], length);
+                if (expected_response.size() > response_.size()) {
+                    doReceive(socket, expected_response);
+                }
+
+            } else if (ec.value() != boost::asio::error::operation_aborted) {
+                ADD_FAILURE() << "error occurred while asynchronously receiving"
+                    " data via unix domain socket: " << ec.message();
+            }
+        });
+    }
+
+    /// @brief IO service used by the tests.
+    IOService io_service_;
+
+    /// @brief Server side unix socket used in these tests.
+    test::TestServerUnixSocketPtr test_socket_;
+
+    /// @brief String containing a response received with @c doReceive.
+    std::string response_;
+
+    /// @brief Read buffer used by @c doReceive.
+    std::array<char, 2> read_buf_;
+};
+
+// This test verifies that the client can send data over the unix
+// domain socket and receive a response.
+TEST_F(UnixDomainSocketTest, sendReceive) {
+    // Start the server.
+    test_socket_->bindServerSocket();
+
+    // Setup client side.
+    UnixDomainSocket socket(io_service_);
+    ASSERT_NO_THROW(socket.connect(unixSocketFilePath()));
+
+    // Send "foo".
+    const std::string outbound_data = "foo";
+    size_t sent_size = 0;
+    ASSERT_NO_THROW(sent_size = socket.write(outbound_data.c_str(),
+                                             outbound_data.size()));
+    // Make sure all data have been sent.
+    ASSERT_EQ(outbound_data.size(), sent_size);
+
+    // Run IO service to generate server's response.
+    while ((test_socket_->getResponseNum() < 1) &&
+           (!test_socket_->isStopped())) {
+        io_service_.run_one();
+    }
+
+    // Receive response from the socket.
+    std::array<char, 1024> read_buf;
+    size_t bytes_read = 0;
+    ASSERT_NO_THROW(bytes_read = socket.receive(&read_buf[0], read_buf.size()));
+    std::string response(&read_buf[0], bytes_read);
+
+    // The server should prepend "received" to the data we had sent.
+    EXPECT_EQ("received foo", response);
+}
+
+// This test verifies that the client can send the data over the unix
+// domain socket and receive a response asynchronously.
+TEST_F(UnixDomainSocketTest, asyncSendReceive) {
+    // Start the server.
+    test_socket_->bindServerSocket();
+
+    // Setup client side.
+    UnixDomainSocket socket(io_service_);
+
+    // We're going to asynchronously connect to the server. The boolean value
+    // below will be modified by the connect handler function (lambda) invoked
+    // when the connection is established or if an error occurs.
+    bool connect_handler_invoked = false;
+    ASSERT_NO_THROW(socket.asyncConnect(unixSocketFilePath(),
+        [&connect_handler_invoked](const boost::system::error_code& ec) {
+            // Indicate that the handler has been called so as the loop below gets
+            // interrupted.
+            connect_handler_invoked = true;
+            // Operation aborted indicates that IO service has been stopped. This
+            // shouldn't happen here.
+            if (ec && (ec.value() != boost::asio::error::operation_aborted)) {
+                ADD_FAILURE() << "error occurred while asynchronously connecting"
+                    " via unix domain socket: " << ec.message();
+            }
+        }
+    ));
+    // Run IO service until connect handler is invoked.
+    while (!connect_handler_invoked && (!test_socket_->isStopped())) {
+        io_service_.run_one();
+    }
+
+    // We are going to asynchronously send the 'foo' over the unix socket.
+    const std::string outbound_data = "foo";
+    size_t sent_size = 0;
+    ASSERT_NO_THROW(socket.asyncSend(outbound_data.c_str(), outbound_data.size(),
+        [&sent_size](const boost::system::error_code& ec, size_t length) {
+        // If we have been successful sending the data, record the number of
+        // bytes we have sent.
+        if (!ec) {
+            sent_size = length;
+
+        } else if (ec.value() != boost::asio::error::operation_aborted) {
+            ADD_FAILURE() << "error occurred while asynchronously sending the"
+            " data over unix domain socket: " << ec.message();
+        }
+    }
+    ));
+
+    // Run IO service to generate server's response.
+    while ((test_socket_->getResponseNum() < 1) &&
+           (!test_socket_->isStopped())) {
+        io_service_.run_one();
+    }
+
+    // There is no guarantee that all data have been sent so we only check that
+    // some data have been sent.
+    ASSERT_GT(sent_size, 0);
+
+    std::string expected_response = "received foo";
+    doReceive(socket, expected_response);
+
+    // Run IO service until we get the full response from the server.
+    while ((response_.size() < expected_response.size()) &&
+           !test_socket_->isStopped()) {
+        io_service_.run_one();
+    }
+
+    // Check that the entire response has been received and is correct.
+    EXPECT_EQ(expected_response, response_);
+}
+
+// This test verifies that UnixDomainSocketError exception is thrown
+// on attempt to connect, write or receive when the server socket
+// is not available.
+TEST_F(UnixDomainSocketTest, clientErrors) {
+    UnixDomainSocket socket(io_service_);
+    ASSERT_THROW(socket.connect(unixSocketFilePath()), UnixDomainSocketError);
+    const std::string outbound_data = "foo";
+    ASSERT_THROW(socket.write(outbound_data.c_str(), outbound_data.size()),
+                 UnixDomainSocketError);
+    std::array<char, 1024> read_buf;
+    ASSERT_THROW(socket.receive(&read_buf[0], read_buf.size()),
+                 UnixDomainSocketError);
+}
+
+// This test verifies that an error is returned on attempt to asynchronously
+// connect, write or receive when the server socket is not available.
+TEST_F(UnixDomainSocketTest, asyncClientErrors) {
+    UnixDomainSocket socket(io_service_);
+
+    // Asynchronous operations signal errors through boost::system::error_code
+    // object passed to the handler function. This object casts to boolean.
+    // In case of success the object casts to false. In case of an error it
+    // casts to true. The actual error codes can be retrieved by comparing the
+    // ec objects to predefined error objects. We don't check for the actual
+    // errors here, because it is not certain that the same error codes would
+    // be returned on various operating systems.
+
+    // In the following tests we use C++11 lambdas as callbacks.
+
+    // Connect
+    bool connect_handler_invoked = false;
+    socket.asyncConnect(unixSocketFilePath(),
+        [&connect_handler_invoked](const boost::system::error_code& ec) {
+        connect_handler_invoked = true;
+        EXPECT_TRUE(ec);
+    });
+    while (!connect_handler_invoked && !test_socket_->isStopped()) {
+        io_service_.run_one();
+    }
+
+    // Send
+    const std::string outbound_data = "foo";
+    bool send_handler_invoked = false;
+    socket.asyncSend(outbound_data.c_str(), outbound_data.size(),
+        [&send_handler_invoked]
+        (const boost::system::error_code& ec, size_t /* length */) {
+        send_handler_invoked = true;
+        EXPECT_TRUE(ec);
+    });
+    while (!send_handler_invoked && !test_socket_->isStopped()) {
+        io_service_.run_one();
+    }
+
+    // Receive
+    bool receive_handler_invoked = false;
+    std::array<char, 1024> read_buf;
+    socket.asyncReceive(&read_buf[0], read_buf.size(),
+        [&receive_handler_invoked]
+        (const boost::system::error_code& ec, size_t /* length */) {
+        receive_handler_invoked = true;
+        EXPECT_TRUE(ec);
+    });
+    while (!receive_handler_invoked && !test_socket_->isStopped()) {
+        io_service_.run_one();
+    }
+}
+
+// Check that native socket descriptor is returned correctly when
+// the socket is connected.
+TEST_F(UnixDomainSocketTest, getNative) {
+    // Start the server.
+    test_socket_->bindServerSocket();
+
+    // Setup client side.
+    UnixDomainSocket socket(io_service_);
+    ASSERT_NO_THROW(socket.connect(unixSocketFilePath()));
+    ASSERT_GE(socket.getNative(), 0);
+}
+
+// Check that protocol returned is 0.
+TEST_F(UnixDomainSocketTest, getProtocol) {
+    UnixDomainSocket socket(io_service_);
+    EXPECT_EQ(0, socket.getProtocol());
+}
+
+}