def test_should_return_error_given_invalid_customer(self):
customer_validation = CustomerValidation(self.customer)
self.customer.name = ""
error = customer_validation.validate()
self.assertNotEqual(error, None)
def test_should_not_return_error_given_valid_customer(self):
customer_validation = CustomerValidation(self.customer)
error = customer_validation.validate()
self.assertEqual(error, None)