Hello,

<snipped>

diff --git a/test/tarantool-c-tests/lj-881-fix-lua-concat.test.c 
b/test/tarantool-c-tests/lj-881-fix-lua-concat.test.c
index 1835d273..f028c457 100644
--- a/test/tarantool-c-tests/lj-881-fix-lua-concat.test.c
+++ b/test/tarantool-c-tests/lj-881-fix-lua-concat.test.c
@@ -77,7 +77,7 @@ static int lua_concat_testcase(void *test_state)
      const char *str = lua_tostring(L, -1);
      assert_int_equal(lua_gettop(L), top - 2 + 1);
      const char expected_str[] = CONCAT("A + ", TEST_VALUE);
-    assert_str_equal(str, expected_str, strlen(expected_str));
+    assert_str_equal(str, expected_str);

      /* Teardown. */
      lua_settop(L, 0);
diff --git a/test/tarantool-c-tests/test.h b/test/tarantool-c-tests/test.h
index 2f2d9ea2..5e5c96b2 100644
--- a/test/tarantool-c-tests/test.h
+++ b/test/tarantool-c-tests/test.h
@@ -212,15 +212,15 @@ static inline int todo(const char *reason)
      );                                \
  } while (0)

-#define assert_str_equal(got, expected, n) do {                \
-    assert_general(strncmp(got, expected, n) == 0,            \
+#define assert_str_equal(got, expected) do {                \
+    assert_general(strncmp(got, expected, strlen(expected)) == 0,    \

On the second thought, I insist on using `strcmp()` here since the
expected string is always `\0` terminated, and we use "not safe" the
`strlen()` anyway.

Updated.

diff --git a/test/tarantool-c-tests/test.h b/test/tarantool-c-tests/test.h
index 5e5c96b2..3b22fb92 100644
--- a/test/tarantool-c-tests/test.h
+++ b/test/tarantool-c-tests/test.h
@@ -213,14 +213,14 @@ static inline int todo(const char *reason)
 } while (0)
 
 #define assert_str_equal(got, expected) do {                           \
-       assert_general(strncmp(got, expected, strlen(expected)) == 0,   \
+       assert_general(strcmp(got, expected) == 0,                      \
                       ASSERT_EQUAL_FMT(str, "%s"),                     \
                       __FILE__, __LINE__, (got), (expected)            \
        );                                                              \
 } while (0)
 
 #define assert_str_not_equal(got, unexpected) do {                     \
-       assert_general(strncmp(got, expected, strlen(expected)) != 0,   \
+       assert_general(strcmp(got, expected) != 0,                      \
                       ASSERT_NOT_EQUAL_FMT(str, "%s"),                 \
                       __FILE__, __LINE__, (got), (unexpected)          \
        );                                                              \

                 ASSERT_EQUAL_FMT(str, "%s"),            \
                 __FILE__, __LINE__, (got), (expected)        \
      );                                \
  } while (0)

-#define assert_str_not_equal(got, unexpected, n) do { \
-    assert_general(strncmp(got, expected, n) != 0,            \
+#define assert_str_not_equal(got, unexpected) do {            \
+    assert_general(strncmp(got, expected, strlen(expected)) != 0,    \

Ditto.

                 ASSERT_NOT_EQUAL_FMT(str, "%s"),            \
                 __FILE__, __LINE__, (got), (unexpected)        \
      );                                \

+                       ASSERT_NOT_EQUAL_FMT(str, "%s"),                 \
+                       __FILE__, __LINE__, (got), (unexpected)          \
+        );                                                              \
+} while (0)
+
  #endif /* TARANTOOL_LUAJIT_TEST_H */