import importlib.util

import pytest


def test_missing_input_is_reported_before_any_work(tmp_path):
    pytest.importorskip("atomworks")
    import torch

    from rfd4_proteina_prep import prepare_cif

    with pytest.raises(FileNotFoundError):
        prepare_cif(tmp_path / "missing.cif", seed=0, device=torch.device("cpu"))


def test_public_api():
    import rfd4_proteina_prep

    assert set(rfd4_proteina_prep.__all__) == {"prepare_cif", "write_cif"}
    assert importlib.util.find_spec("rfd4_proteina_prep.processing") is not None