def test_long_track_number(self): self.assertFalse(Track.number_is_valid("12"))
def test_numeric_track_number(self): self.assertFalse(Track.number_is_valid(0))
def test_uppercase_track_number(self): self.assertTrue(Track.number_is_valid("M"))
def test_lowercase_track_number(self): self.assertTrue(Track.number_is_valid("m"))
def test_digit_track_number(self): self.assertTrue(Track.number_is_valid("1"))