681   check(strstr("abcd", "z") == NULL, 1);	/* Not found. */  in test_strstr()
682   check(strstr("abcd", "abx") == NULL, 2);	/* Dead end. */  in test_strstr()
684   check(strstr(one, "c") == one+2, 3);	/* Basic test. */  in test_strstr()
685   check(strstr(one, "bc") == one+1, 4);	/* Multichar. */  in test_strstr()
686   check(strstr(one, "d") == one+3, 5);	/* End of string. */  in test_strstr()
687   check(strstr(one, "cd") == one+2, 6);	/* Tail of string. */  in test_strstr()
688   check(strstr(one, "abc") == one, 7);	/* Beginning. */  in test_strstr()
689   check(strstr(one, "abcd") == one, 8);	/* Exact match. */  in test_strstr()
690   check(strstr(one, "abcde") == NULL, 9);	/* Too long. */  in test_strstr()
691   check(strstr(one, "de") == NULL, 10);	/* Past end. */  in test_strstr()
692   check(strstr(one, "") == one, 11);	/* Finding empty. */  in test_strstr()
694   check(strstr(one, "ba") == one+1, 12);	/* Finding first. */  in test_strstr()
696   check(strstr(one, "b") == NULL, 13);	/* Empty string. */  in test_strstr()
697   check(strstr(one, "") == one, 14);	/* Empty in empty string. */  in test_strstr()
699   check(strstr(one, "bca") == one+2, 15);	/* False start. */  in test_strstr()
701   check(strstr(one, "bbca") == one+1, 16);	/* With overlap. */  in test_strstr()