def METHOD_NAME():
    """Test _pad_iter_of_iters"""
    iterable = [(0.0,) * 3, (0.0,) * 3, (None,) * 3]
    padded_iterable, padded_iterable_bool = pad_cell(iterable)
    assert padded_iterable_bool
    assert all(math.isnan(_) for _ in padded_iterable[-1])
    for i in range(2):
        assert padded_iterable[i] == (0.0,) * 3
    for valid_padding_value in (3.0, 3, "3", "3.0"):
        padded_iterable, padded_iterable_bool = pad_cell(iterable, valid_padding_value)
        assert padded_iterable_bool
        assert padded_iterable[-1] == (float(valid_padding_value),) * 3
        for i in range(2):
            assert padded_iterable[i] == (0.0,) * 3
    # Since nan != nan, the above for-loop cannot be used for nan
    valid_padding_value = "nan"
    padded_iterable, padded_iterable_bool = pad_cell(iterable, valid_padding_value)
    assert padded_iterable_bool
    assert all(math.isnan(_) for _ in padded_iterable[-1])
    assert all(math.isnan(_) for _ in (float(valid_padding_value),) * 3)
    for i in range(2):
        assert padded_iterable[i] == (0.0,) * 3
    invalid_padding_value = "x"
    padded_iterable, padded_iterable_bool = pad_cell(iterable, invalid_padding_value)
    assert padded_iterable_bool
    assert all(math.isnan(_) for _ in padded_iterable[-1])
    for i in range(2):
        assert padded_iterable[i] == (0.0,) * 3