27     S sNot {"xyz", 3};  in test()  local
54     assert( sNot.contains(""));  in test()
55     assert(!sNot.contains("d"));  in test()
56     assert(!sNot.contains("e"));  in test()
57     assert(!sNot.contains("de"));  in test()
58     assert(!sNot.contains("cd"));  in test()
59     assert(!sNot.contains("cde"));  in test()
60     assert(!sNot.contains("bcde"));  in test()
61     assert(!sNot.contains("abcde"));  in test()
62     assert( sNot.contains("xyz"));  in test()
63     assert(!sNot.contains("zyx"));  in test()