from __future__ import annotations

import pytest

from gap_pipeline.store import RunStore


def test_store_refuses_conflicting_overwrite(tmp_path) -> None:
    store = RunStore(tmp_path, "item")
    store.write_json("artifact.json", {"value": 1})
    store.write_json("artifact.json", {"value": 1})
    with pytest.raises(FileExistsError, match="refusing to overwrite"):
        store.write_json("artifact.json", {"value": 2})