'Verifies that the view returns Forbidden if the LTI OAuth signature is
incorrect.'

def test_forbidden_if_signature_fails(self):

    self.mock_verify.return_value = False
    request = build_launch_request()
    response = views.lti_launch(request, None, None)
    self.assertEqual(response.status_code, 403)
    self.assertEqual(response.status_code, 403)
