def test_animate(): with patch.object(Boids, 'update_boids') as mock_get: new_flock = Boids(2, config_filename) """new_flock.positions[0][0] = 0 new_flock.positions[1][0] = 0 new_flock.positions[0][1] = 1 new_flock.positions[1][1] = 0""" new_flock.animate() print mock_get.mock_calls mock_get.assert_called_with()