def METHOD_NAME(
    signal: np.ndarray, normalised_result: np.ndarray, row_means: np.ndarray
) -> None:
    """Test normalize_signal function"""
    result = normalize_signal(signal)
    np.testing.assert_array_almost_equal(result[0], normalised_result)
    np.testing.assert_array_almost_equal(result[1], row_means)