def METHOD_NAME(
    raw_value: _FirstType,
    container: 'PairLikeN[_FirstType, _SecondType, _ThirdType]',
) -> None:
    """Ensures that unpaired and paired constructors work fine."""
    assert_equal(
        container.from_unpaired(raw_value),
        container.from_paired(raw_value, raw_value),
    )