    def test_change_nonexistent_due_date(self):
        url = reverse('change_due_date', kwargs={'course_id': self.course.id.to_deprecated_string()})
        response = self.client.get(url, {
            'student': self.user1.username,
            'url': self.week3.location.to_deprecated_string(),
            'due_datetime': '12/30/2013 00:00'
        })
        self.assertEqual(response.status_code, 400, response.content)
        self.assertEqual(
            None,
            get_extended_due(self.course, self.week3, self.user1)
        )
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.