def test_validation_birth_year_invalid(self):
p = Passport(data='byr:1900')
actual = p.validate_birth_year()
self.assertFalse(actual)
def test_validation_birth_year_true_if_missing(self):
p = Passport(data='place_holder:1234')
actual = p.validate_birth_year()
self.assertTrue(actual)
def test_validation_birth_year_valid(self):
p = Passport(data='byr:1989')
actual = p.validate_birth_year()
self.assertTrue(actual)
