def METHOD_NAME(self, mock_user_get):
    # Arrange
    mock_user_get.return_value = return_canned_user()
    mock_user_get.return_value.email_address = TEST_USER_EMAIL
    entropy = current_app.secret_key if current_app.secret_key else "un1testingmode"
    serializer = URLSafeTimedSerializer(entropy)
    # Act/Assert
    self.assertIsNotNone(
        AuthenticationService().authenticate_email_token(
            username=TEST_USERNAME,
            token=serializer.dumps(TEST_USER_EMAIL),
        )
    )