'"Test retrieving failure.'

def test_camera_image_tries_login_bails_on_failure(self):

    with mock.patch.object(self.uvc, '_login') as mock_login:
        mock_login.return_value = False
        self.assertEqual(None, self.uvc.camera_image())
        self.assertEqual(mock_login.call_count, 1)
        self.assertEqual(mock_login.call_args, mock.call())
