    def test_get_problem_responses_invalid_location(self):
        """
        Test whether get_problem_responses returns an appropriate status
        message when users submit an invalid problem location.
        """
        url = reverse(
            'get_problem_responses',
            kwargs={'course_id': unicode(self.course.id)}
        )
        problem_location = ''

        response = self.client.get(url, {'problem_location': problem_location})
        res_json = json.loads(response.content)
        self.assertEqual(res_json, 'Could not find problem with this location.')
The web application does not, or can not, sufficiently verify whether a well-formed, valid, consistent request was intentionally provided by the user who submitted the request.