def METHOD_NAME(self, invalid_form_errors):
    """
    Helper method to test the valid form and an invalid form.
    Input the expected form error of the invalid form.
    Remember, this method name cannot begin with 'test'
    """
    self.assertTrue(self.valid_form.is_valid())
    self.assertFalse(self.invalid_form.is_valid())
    self.assertEqual(self.invalid_form.errors, invalid_form_errors)