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-rw-r--r--lib/kunit/string-stream-test.c525
1 files changed, 508 insertions, 17 deletions
diff --git a/lib/kunit/string-stream-test.c b/lib/kunit/string-stream-test.c
index 110f3a9932..06822766f2 100644
--- a/lib/kunit/string-stream-test.c
+++ b/lib/kunit/string-stream-test.c
@@ -6,48 +6,539 @@
* Author: Brendan Higgins <brendanhiggins@google.com>
*/
+#include <kunit/static_stub.h>
#include <kunit/test.h>
+#include <linux/ktime.h>
#include <linux/slab.h>
+#include <linux/timekeeping.h>
#include "string-stream.h"
-static void string_stream_test_empty_on_creation(struct kunit *test)
+struct string_stream_test_priv {
+ /* For testing resource-managed free. */
+ struct string_stream *expected_free_stream;
+ bool stream_was_freed;
+ bool stream_free_again;
+};
+
+/* Avoids a cast warning if kfree() is passed direct to kunit_add_action(). */
+static void kfree_wrapper(void *p)
+{
+ kfree(p);
+}
+
+/* Avoids a cast warning if string_stream_destroy() is passed direct to kunit_add_action(). */
+static void cleanup_raw_stream(void *p)
+{
+ struct string_stream *stream = p;
+
+ string_stream_destroy(stream);
+}
+
+static char *get_concatenated_string(struct kunit *test, struct string_stream *stream)
+{
+ char *str = string_stream_get_string(stream);
+
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, str);
+ kunit_add_action(test, kfree_wrapper, (void *)str);
+
+ return str;
+}
+
+/* Managed string_stream object is initialized correctly. */
+static void string_stream_managed_init_test(struct kunit *test)
+{
+ struct string_stream *stream;
+
+ /* Resource-managed initialization. */
+ stream = kunit_alloc_string_stream(test, GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream);
+
+ KUNIT_EXPECT_EQ(test, stream->length, 0);
+ KUNIT_EXPECT_TRUE(test, list_empty(&stream->fragments));
+ KUNIT_EXPECT_TRUE(test, (stream->gfp == GFP_KERNEL));
+ KUNIT_EXPECT_FALSE(test, stream->append_newlines);
+ KUNIT_EXPECT_TRUE(test, string_stream_is_empty(stream));
+}
+
+/* Unmanaged string_stream object is initialized correctly. */
+static void string_stream_unmanaged_init_test(struct kunit *test)
+{
+ struct string_stream *stream;
+
+ stream = alloc_string_stream(GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream);
+ kunit_add_action(test, cleanup_raw_stream, stream);
+
+ KUNIT_EXPECT_EQ(test, stream->length, 0);
+ KUNIT_EXPECT_TRUE(test, list_empty(&stream->fragments));
+ KUNIT_EXPECT_EQ(test, stream->gfp, GFP_KERNEL);
+ KUNIT_EXPECT_FALSE(test, stream->append_newlines);
+
+ KUNIT_EXPECT_TRUE(test, string_stream_is_empty(stream));
+}
+
+static void string_stream_destroy_stub(struct string_stream *stream)
+{
+ struct kunit *fake_test = kunit_get_current_test();
+ struct string_stream_test_priv *priv = fake_test->priv;
+
+ /* The kunit could own string_streams other than the one we are testing. */
+ if (stream == priv->expected_free_stream) {
+ if (priv->stream_was_freed)
+ priv->stream_free_again = true;
+ else
+ priv->stream_was_freed = true;
+ }
+
+ /*
+ * Calling string_stream_destroy() will only call this function again
+ * because the redirection stub is still active.
+ * Avoid calling deactivate_static_stub() or changing current->kunit_test
+ * during cleanup.
+ */
+ string_stream_clear(stream);
+ kfree(stream);
+}
+
+/* kunit_free_string_stream() calls string_stream_desrtoy() */
+static void string_stream_managed_free_test(struct kunit *test)
+{
+ struct string_stream_test_priv *priv = test->priv;
+
+ priv->expected_free_stream = NULL;
+ priv->stream_was_freed = false;
+ priv->stream_free_again = false;
+
+ kunit_activate_static_stub(test,
+ string_stream_destroy,
+ string_stream_destroy_stub);
+
+ priv->expected_free_stream = kunit_alloc_string_stream(test, GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv->expected_free_stream);
+
+ /* This should call the stub function. */
+ kunit_free_string_stream(test, priv->expected_free_stream);
+
+ KUNIT_EXPECT_TRUE(test, priv->stream_was_freed);
+ KUNIT_EXPECT_FALSE(test, priv->stream_free_again);
+}
+
+/* string_stream object is freed when test is cleaned up. */
+static void string_stream_resource_free_test(struct kunit *test)
+{
+ struct string_stream_test_priv *priv = test->priv;
+ struct kunit *fake_test;
+
+ fake_test = kunit_kzalloc(test, sizeof(*fake_test), GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, fake_test);
+
+ kunit_init_test(fake_test, "string_stream_fake_test", NULL);
+ fake_test->priv = priv;
+
+ /*
+ * Activate stub before creating string_stream so the
+ * string_stream will be cleaned up first.
+ */
+ priv->expected_free_stream = NULL;
+ priv->stream_was_freed = false;
+ priv->stream_free_again = false;
+
+ kunit_activate_static_stub(fake_test,
+ string_stream_destroy,
+ string_stream_destroy_stub);
+
+ priv->expected_free_stream = kunit_alloc_string_stream(fake_test, GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv->expected_free_stream);
+
+ /* Set current->kunit_test to fake_test so the static stub will be called. */
+ current->kunit_test = fake_test;
+
+ /* Cleanup test - the stub function should be called */
+ kunit_cleanup(fake_test);
+
+ /* Set current->kunit_test back to current test. */
+ current->kunit_test = test;
+
+ KUNIT_EXPECT_TRUE(test, priv->stream_was_freed);
+ KUNIT_EXPECT_FALSE(test, priv->stream_free_again);
+}
+
+/*
+ * Add a series of lines to a string_stream. Check that all lines
+ * appear in the correct order and no characters are dropped.
+ */
+static void string_stream_line_add_test(struct kunit *test)
+{
+ struct string_stream *stream;
+ char line[60];
+ char *concat_string, *pos, *string_end;
+ size_t len, total_len;
+ int num_lines, i;
+
+ stream = kunit_alloc_string_stream(test, GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream);
+
+ /* Add series of sequence numbered lines */
+ total_len = 0;
+ for (i = 0; i < 100; ++i) {
+ len = snprintf(line, sizeof(line),
+ "The quick brown fox jumps over the lazy penguin %d\n", i);
+
+ /* Sanity-check that our test string isn't truncated */
+ KUNIT_ASSERT_LT(test, len, sizeof(line));
+
+ string_stream_add(stream, line);
+ total_len += len;
+ }
+ num_lines = i;
+
+ concat_string = get_concatenated_string(test, stream);
+ KUNIT_EXPECT_NOT_ERR_OR_NULL(test, concat_string);
+ KUNIT_EXPECT_EQ(test, strlen(concat_string), total_len);
+
+ /*
+ * Split the concatenated string at the newlines and check that
+ * all the original added strings are present.
+ */
+ pos = concat_string;
+ for (i = 0; i < num_lines; ++i) {
+ string_end = strchr(pos, '\n');
+ KUNIT_EXPECT_NOT_NULL(test, string_end);
+
+ /* Convert to NULL-terminated string */
+ *string_end = '\0';
+
+ snprintf(line, sizeof(line),
+ "The quick brown fox jumps over the lazy penguin %d", i);
+ KUNIT_EXPECT_STREQ(test, pos, line);
+
+ pos = string_end + 1;
+ }
+
+ /* There shouldn't be any more data after this */
+ KUNIT_EXPECT_EQ(test, strlen(pos), 0);
+}
+
+/* Add a series of lines of variable length to a string_stream. */
+static void string_stream_variable_length_line_test(struct kunit *test)
+{
+ static const char line[] =
+ "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+ " 0123456789!$%^&*()_-+={}[]:;@'~#<>,.?/|";
+ struct string_stream *stream;
+ struct rnd_state rnd;
+ char *concat_string, *pos, *string_end;
+ size_t offset, total_len;
+ int num_lines, i;
+
+ stream = kunit_alloc_string_stream(test, GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream);
+
+ /*
+ * Log many lines of varying lengths until we have created
+ * many fragments.
+ * The "randomness" must be repeatable.
+ */
+ prandom_seed_state(&rnd, 3141592653589793238ULL);
+ total_len = 0;
+ for (i = 0; i < 100; ++i) {
+ offset = prandom_u32_state(&rnd) % (sizeof(line) - 1);
+ string_stream_add(stream, "%s\n", &line[offset]);
+ total_len += sizeof(line) - offset;
+ }
+ num_lines = i;
+
+ concat_string = get_concatenated_string(test, stream);
+ KUNIT_EXPECT_NOT_ERR_OR_NULL(test, concat_string);
+ KUNIT_EXPECT_EQ(test, strlen(concat_string), total_len);
+
+ /*
+ * Split the concatenated string at the newlines and check that
+ * all the original added strings are present.
+ */
+ prandom_seed_state(&rnd, 3141592653589793238ULL);
+ pos = concat_string;
+ for (i = 0; i < num_lines; ++i) {
+ string_end = strchr(pos, '\n');
+ KUNIT_EXPECT_NOT_NULL(test, string_end);
+
+ /* Convert to NULL-terminated string */
+ *string_end = '\0';
+
+ offset = prandom_u32_state(&rnd) % (sizeof(line) - 1);
+ KUNIT_EXPECT_STREQ(test, pos, &line[offset]);
+
+ pos = string_end + 1;
+ }
+
+ /* There shouldn't be any more data after this */
+ KUNIT_EXPECT_EQ(test, strlen(pos), 0);
+}
+
+/* Appending the content of one string stream to another. */
+static void string_stream_append_test(struct kunit *test)
+{
+ static const char * const strings_1[] = {
+ "one", "two", "three", "four", "five", "six",
+ "seven", "eight", "nine", "ten",
+ };
+ static const char * const strings_2[] = {
+ "Apple", "Pear", "Orange", "Banana", "Grape", "Apricot",
+ };
+ struct string_stream *stream_1, *stream_2;
+ const char *stream1_content_before_append, *stream_2_content;
+ char *combined_content;
+ size_t combined_length;
+ int i;
+
+ stream_1 = kunit_alloc_string_stream(test, GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream_1);
+
+ stream_2 = kunit_alloc_string_stream(test, GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream_2);
+
+ /* Append content of empty stream to empty stream */
+ string_stream_append(stream_1, stream_2);
+ KUNIT_EXPECT_EQ(test, strlen(get_concatenated_string(test, stream_1)), 0);
+
+ /* Add some data to stream_1 */
+ for (i = 0; i < ARRAY_SIZE(strings_1); ++i)
+ string_stream_add(stream_1, "%s\n", strings_1[i]);
+
+ stream1_content_before_append = get_concatenated_string(test, stream_1);
+
+ /* Append content of empty stream to non-empty stream */
+ string_stream_append(stream_1, stream_2);
+ KUNIT_EXPECT_STREQ(test, get_concatenated_string(test, stream_1),
+ stream1_content_before_append);
+
+ /* Add some data to stream_2 */
+ for (i = 0; i < ARRAY_SIZE(strings_2); ++i)
+ string_stream_add(stream_2, "%s\n", strings_2[i]);
+
+ /* Append content of non-empty stream to non-empty stream */
+ string_stream_append(stream_1, stream_2);
+
+ /*
+ * End result should be the original content of stream_1 plus
+ * the content of stream_2.
+ */
+ stream_2_content = get_concatenated_string(test, stream_2);
+ combined_length = strlen(stream1_content_before_append) + strlen(stream_2_content);
+ combined_length++; /* for terminating \0 */
+ combined_content = kunit_kmalloc(test, combined_length, GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, combined_content);
+ snprintf(combined_content, combined_length, "%s%s",
+ stream1_content_before_append, stream_2_content);
+
+ KUNIT_EXPECT_STREQ(test, get_concatenated_string(test, stream_1), combined_content);
+
+ /* Append content of non-empty stream to empty stream */
+ kunit_free_string_stream(test, stream_1);
+
+ stream_1 = kunit_alloc_string_stream(test, GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream_1);
+
+ string_stream_append(stream_1, stream_2);
+ KUNIT_EXPECT_STREQ(test, get_concatenated_string(test, stream_1), stream_2_content);
+}
+
+/* Appending the content of one string stream to one with auto-newlining. */
+static void string_stream_append_auto_newline_test(struct kunit *test)
+{
+ struct string_stream *stream_1, *stream_2;
+
+ /* Stream 1 has newline appending enabled */
+ stream_1 = kunit_alloc_string_stream(test, GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream_1);
+ string_stream_set_append_newlines(stream_1, true);
+ KUNIT_EXPECT_TRUE(test, stream_1->append_newlines);
+
+ /* Stream 2 does not append newlines */
+ stream_2 = kunit_alloc_string_stream(test, GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream_2);
+
+ /* Appending a stream with a newline should not add another newline */
+ string_stream_add(stream_1, "Original string\n");
+ string_stream_add(stream_2, "Appended content\n");
+ string_stream_add(stream_2, "More stuff\n");
+ string_stream_append(stream_1, stream_2);
+ KUNIT_EXPECT_STREQ(test, get_concatenated_string(test, stream_1),
+ "Original string\nAppended content\nMore stuff\n");
+
+ kunit_free_string_stream(test, stream_2);
+ stream_2 = kunit_alloc_string_stream(test, GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream_2);
+
+ /*
+ * Appending a stream without newline should add a final newline.
+ * The appended string_stream is treated as a single string so newlines
+ * should not be inserted between fragments.
+ */
+ string_stream_add(stream_2, "Another");
+ string_stream_add(stream_2, "And again");
+ string_stream_append(stream_1, stream_2);
+ KUNIT_EXPECT_STREQ(test, get_concatenated_string(test, stream_1),
+ "Original string\nAppended content\nMore stuff\nAnotherAnd again\n");
+}
+
+/* Adding an empty string should not create a fragment. */
+static void string_stream_append_empty_string_test(struct kunit *test)
{
- struct string_stream *stream = alloc_string_stream(test, GFP_KERNEL);
+ struct string_stream *stream;
+ int original_frag_count;
+
+ stream = kunit_alloc_string_stream(test, GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream);
+ /* Formatted empty string */
+ string_stream_add(stream, "%s", "");
KUNIT_EXPECT_TRUE(test, string_stream_is_empty(stream));
+ KUNIT_EXPECT_TRUE(test, list_empty(&stream->fragments));
+
+ /* Adding an empty string to a non-empty stream */
+ string_stream_add(stream, "Add this line");
+ original_frag_count = list_count_nodes(&stream->fragments);
+
+ string_stream_add(stream, "%s", "");
+ KUNIT_EXPECT_EQ(test, list_count_nodes(&stream->fragments), original_frag_count);
+ KUNIT_EXPECT_STREQ(test, get_concatenated_string(test, stream), "Add this line");
}
-static void string_stream_test_not_empty_after_add(struct kunit *test)
+/* Adding strings without automatic newline appending */
+static void string_stream_no_auto_newline_test(struct kunit *test)
{
- struct string_stream *stream = alloc_string_stream(test, GFP_KERNEL);
+ struct string_stream *stream;
- string_stream_add(stream, "Foo");
+ stream = kunit_alloc_string_stream(test, GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream);
- KUNIT_EXPECT_FALSE(test, string_stream_is_empty(stream));
+ /*
+ * Add some strings with and without newlines. All formatted newlines
+ * should be preserved. It should not add any extra newlines.
+ */
+ string_stream_add(stream, "One");
+ string_stream_add(stream, "Two\n");
+ string_stream_add(stream, "%s\n", "Three");
+ string_stream_add(stream, "%s", "Four\n");
+ string_stream_add(stream, "Five\n%s", "Six");
+ string_stream_add(stream, "Seven\n\n");
+ string_stream_add(stream, "Eight");
+ KUNIT_EXPECT_STREQ(test, get_concatenated_string(test, stream),
+ "OneTwo\nThree\nFour\nFive\nSixSeven\n\nEight");
}
-static void string_stream_test_get_string(struct kunit *test)
+/* Adding strings with automatic newline appending */
+static void string_stream_auto_newline_test(struct kunit *test)
{
- struct string_stream *stream = alloc_string_stream(test, GFP_KERNEL);
- char *output;
+ struct string_stream *stream;
+
+ stream = kunit_alloc_string_stream(test, GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream);
+
+ string_stream_set_append_newlines(stream, true);
+ KUNIT_EXPECT_TRUE(test, stream->append_newlines);
+
+ /*
+ * Add some strings with and without newlines. Newlines should
+ * be appended to lines that do not end with \n, but newlines
+ * resulting from the formatting should not be changed.
+ */
+ string_stream_add(stream, "One");
+ string_stream_add(stream, "Two\n");
+ string_stream_add(stream, "%s\n", "Three");
+ string_stream_add(stream, "%s", "Four\n");
+ string_stream_add(stream, "Five\n%s", "Six");
+ string_stream_add(stream, "Seven\n\n");
+ string_stream_add(stream, "Eight");
+ KUNIT_EXPECT_STREQ(test, get_concatenated_string(test, stream),
+ "One\nTwo\nThree\nFour\nFive\nSix\nSeven\n\nEight\n");
+}
+
+/*
+ * This doesn't actually "test" anything. It reports time taken
+ * and memory used for logging a large number of lines.
+ */
+static void string_stream_performance_test(struct kunit *test)
+{
+ struct string_stream_fragment *frag_container;
+ struct string_stream *stream;
+ char test_line[101];
+ ktime_t start_time, end_time;
+ size_t len, bytes_requested, actual_bytes_used, total_string_length;
+ int offset, i;
+
+ stream = kunit_alloc_string_stream(test, GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream);
+
+ memset(test_line, 'x', sizeof(test_line) - 1);
+ test_line[sizeof(test_line) - 1] = '\0';
+
+ start_time = ktime_get();
+ for (i = 0; i < 10000; i++) {
+ offset = i % (sizeof(test_line) - 1);
+ string_stream_add(stream, "%s: %d\n", &test_line[offset], i);
+ }
+ end_time = ktime_get();
+
+ /*
+ * Calculate memory used. This doesn't include invisible
+ * overhead due to kernel allocator fragment size rounding.
+ */
+ bytes_requested = sizeof(*stream);
+ actual_bytes_used = ksize(stream);
+ total_string_length = 0;
+
+ list_for_each_entry(frag_container, &stream->fragments, node) {
+ bytes_requested += sizeof(*frag_container);
+ actual_bytes_used += ksize(frag_container);
+
+ len = strlen(frag_container->fragment);
+ total_string_length += len;
+ bytes_requested += len + 1; /* +1 for '\0' */
+ actual_bytes_used += ksize(frag_container->fragment);
+ }
+
+ kunit_info(test, "Time elapsed: %lld us\n",
+ ktime_us_delta(end_time, start_time));
+ kunit_info(test, "Total string length: %zu\n", total_string_length);
+ kunit_info(test, "Bytes requested: %zu\n", bytes_requested);
+ kunit_info(test, "Actual bytes allocated: %zu\n", actual_bytes_used);
+}
+
+static int string_stream_test_init(struct kunit *test)
+{
+ struct string_stream_test_priv *priv;
+
+ priv = kunit_kzalloc(test, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
- string_stream_add(stream, "Foo");
- string_stream_add(stream, " %s", "bar");
+ test->priv = priv;
- output = string_stream_get_string(stream);
- KUNIT_ASSERT_STREQ(test, output, "Foo bar");
+ return 0;
}
static struct kunit_case string_stream_test_cases[] = {
- KUNIT_CASE(string_stream_test_empty_on_creation),
- KUNIT_CASE(string_stream_test_not_empty_after_add),
- KUNIT_CASE(string_stream_test_get_string),
+ KUNIT_CASE(string_stream_managed_init_test),
+ KUNIT_CASE(string_stream_unmanaged_init_test),
+ KUNIT_CASE(string_stream_managed_free_test),
+ KUNIT_CASE(string_stream_resource_free_test),
+ KUNIT_CASE(string_stream_line_add_test),
+ KUNIT_CASE(string_stream_variable_length_line_test),
+ KUNIT_CASE(string_stream_append_test),
+ KUNIT_CASE(string_stream_append_auto_newline_test),
+ KUNIT_CASE(string_stream_append_empty_string_test),
+ KUNIT_CASE(string_stream_no_auto_newline_test),
+ KUNIT_CASE(string_stream_auto_newline_test),
+ KUNIT_CASE(string_stream_performance_test),
{}
};
static struct kunit_suite string_stream_test_suite = {
.name = "string-stream-test",
- .test_cases = string_stream_test_cases
+ .test_cases = string_stream_test_cases,
+ .init = string_stream_test_init,
};
kunit_test_suites(&string_stream_test_suite);