def test_invalid_phone(self):
customer_validation = CustomerValidation(self.customer)
self.customer.phone = "string"
error = customer_validation.validate_phone()
self.assertNotEqual(error, None)
def test_with_plus_sign(self):
customer_validation = CustomerValidation(self.customer)
self.customer.phone = "+442 300 1411"
error = customer_validation.validate_phone()
self.assertEqual(error, None)