def test_zip_correct(self):
     self.assertTrue(Validate.validate_zipcode('1234'))
 def test_zip_none(self):
     self.assertFalse(Validate.validate_zipcode(''))
 def test_zip_contains_non_alphanum_char(self):
     self.assertFalse(Validate.validate_zipcode('-123'), Validate.validate_zipcode('12+4'))
 def test_zip_starts_with_zero(self):
     self.assertFalse(Validate.validate_zipcode('0123'))
 def test_zip_not_four_char(self):
     self.assertFalse(Validate.validate_zipcode('12345'))
 def test_zip_contains_alpha(self):
     self.assertFalse(Validate.validate_zipcode('a234'))