def METHOD_NAME(is_right_pad):
    arrays = [np.zeros(shape=(0, 2)) for _ in range(5)]
    stacked = stack(
        arrays,
        variable_length=True,
        is_right_pad=is_right_pad,
    )
    assert stacked.shape[0] == 5
    assert stacked.shape[1] == 1
    assert stacked.shape[2] == 2