637 	char str1[10] = "aabbcc", ncat[10] = "ddee";  in ZTEST()  local
643 	zassert_not_null(strcat(str1, str3), "strcat false");  in ZTEST()
644 	zassert_str_equal(str1, "aabbccd", "test strcat failed");  in ZTEST()
646 	ret = strcspn(str1, str2);  in ZTEST()
648 	ret = strcspn(str1, str3);  in ZTEST()
651 	zassert_true(strncat(ncat, str1, 2), "strncat failed");  in ZTEST()
652 	zassert_not_null(strncat(str1, str3, 2), "strncat failed");  in ZTEST()
657 	zassert_not_null(strncat(str1, str3, 1), "strncat failed");  in ZTEST()
668 	zassert_is_null(strstr(str1, "ayz"), "strstr aabbccd with ayz failed");  in ZTEST()
669 	zassert_not_null(strstr(str1, str2), "strstr aabbccd with b succeed");  in ZTEST()
670 	zassert_not_null(strstr(str1, "bb"), "strstr aabbccd with bb succeed");  in ZTEST()
671 	zassert_not_null(strstr(str1, ""), "strstr aabbccd with \0 failed");  in ZTEST()