def test_always_rollback(self, _email_user):
        connection = transaction.get_connection()
        with patch.object(connection, 'rollback', wraps=connection.rollback) as mock_rollback:
            with self.assertRaises(TestException):
                confirm_email_change(self.request, self.key)

            mock_rollback.assert_called_with()

    def check_confirm_email_change(self, expected_template, expected_context):
        """Call `confirm_email_change` and assert that the content was generated as expected

        `expected_template`: The name of the template that should have been used
            to generate the content
        `expected_context`: The context dictionary that should have been used to
            generate the content
        """
        response = confirm_email_change(self.request, self.key)
        self.assertEquals(mock_render_to_response(expected_template, expected_context).content, response.content)

    def test_always_rollback(self, rollback, _email_user):
        with self.assertRaises(TestException):
            confirm_email_change(self.request, self.key)

        rollback.assert_called_with()