def test_start_time_with_empty_string(self):
     self.assertFalse(Event.is_valid_start_time(""))
 def test_start_time_contains_hyphens(self):
     self.assertFalse(Event.is_valid_start_time("10-55"))
 def test_start_time_with_wrong_time(self):
     self.assertFalse(Event.is_valid_start_time("99:10"))
 def test_start_time_contains_letter(self):
     self.assertFalse(Event.is_valid_start_time("10:1O"))
 def test_start_time_with_valid_string(self):
     self.assertTrue(Event.is_valid_start_time("10:10"))