'Verify that we get an error message when the requested user to remove
does not exist.'

def test_user_does_not_exist(self):

    username = 'bogus'
    cohort = CohortFactory(course_id=self.course.id, users=[])
    response_dict = self.request_remove_user_from_cohort(username, cohort)
    self.verify_removed_user_from_cohort(username, response_dict, cohort, expected_error_msg="No    user    '{0}'".format(username))
