1 files changed, 73 insertions, 0 deletions
diff --git a/tests/lib/memcmp-test.c b/tests/lib/memcmp-test.c
new file mode 100644
index 0000000000..f45b7f43ff
--- /dev/null
+++ b/tests/lib/memcmp-test.c
@@ -0,0 +1,73 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+/* Include memcmp() source code and alter its name to compare results with libc memcmp() */
+#define memcmp cb_memcmp
+
+#include "../lib/memcmp.c"
+
+#undef cb_memcmp
+
+#include <tests/test.h>
+#include <string.h>
+
+const char test_data1[] = "TEST_DATA @4321 !@#$%^&*\\/";
+const size_t test_data1_sz = sizeof(test_data1);
+
+const char test_data2[] = "TEST_DATA @8765 !@#$%^&*\\/";
+const char test_data2_sz = sizeof(test_data2);
+
+static void test_data_correctness(void **state)
+{
+	assert_int_equal(sizeof(test_data1), test_data1_sz);
+	assert_int_equal(sizeof(test_data2), test_data2_sz);
+	assert_int_equal(test_data1_sz, test_data2_sz);
+}
+
+static void test_memcmp_equal(void **state)
+{
+	const int res_cb = cb_memcmp(test_data1, test_data1, test_data1_sz);
+	const int res_std = memcmp(test_data1, test_data1, test_data1_sz);
+
+	assert_int_equal(0, res_cb);
+	assert_int_equal(res_cb, res_std);
+}
+
+static void test_memcmp_first_not_matching_lower(void **state)
+{
+	const int res_cb = cb_memcmp(test_data1, test_data2, test_data1_sz);
+	const int res_std = memcmp(test_data1, test_data2, test_data1_sz);
+
+	assert_true(res_cb < 0);
+	assert_int_equal(res_cb, res_std);
+}
+
+static void test_memcmp_first_not_matching_higher(void **state)
+{
+	const int res_cb = cb_memcmp(test_data2, test_data1, test_data1_sz);
+	const int res_std = memcmp(test_data2, test_data1, test_data1_sz);
+
+	assert_true(res_cb > 0);
+	assert_int_equal(res_cb, res_std);
+}
+
+static void test_memcmp_zero_size(void **state)
+{
+	const int res_cb = cb_memcmp(test_data1, test_data2, 0);
+	const int res_std = memcmp(test_data1, test_data2, 0);
+
+	assert_int_equal(0, res_cb);
+	assert_int_equal(res_cb, res_std);
+}
+
+int main(void)
+{
+	const struct CMUnitTest tests[] = {
+		cmocka_unit_test(test_data_correctness),
+		cmocka_unit_test(test_memcmp_equal),
+		cmocka_unit_test(test_memcmp_first_not_matching_lower),
+		cmocka_unit_test(test_memcmp_first_not_matching_higher),
+		cmocka_unit_test(test_memcmp_zero_size),
+	};
+
+	return cmocka_run_group_tests(tests, NULL, NULL);
+}