assertNotNull("0:01 is a correct time, seconds required", result);
result = algorithm.validate("23:57");
assertNotNull("23:57 is a correct time, seconds required", result);
result = algorithm.validate("1a:30");
assertNotNull("1a:30 is a correct time, seconds required", result);
result = algorithm.validate("12:30:20");
assertNull("12:30:20 is a correct time, seconds required", result);