from pathlib import Path

import pytest

from nisse_dev.main import main


def test_main_refuses_to_start_without_a_config_file(
    monkeypatch: pytest.MonkeyPatch,
    capsys: pytest.CaptureFixture[str],
    tmp_path: Path,
) -> None:
    # Run from an empty directory, and point NISSE_ENV at a file that does not
    # exist: the repository's .env holds live credentials, and a test must
    # never be one cwd away from starting a real agent.
    monkeypatch.chdir(tmp_path)
    monkeypatch.delenv("NISSE_CONFIG", raising=False)
    monkeypatch.setenv("NISSE_ENV", str(tmp_path / "absent.env"))

    assert main() == 2

    err = capsys.readouterr().err
    assert "cannot start" in err
    assert "nisse-dev.example.yaml" in err