import pytest


@pytest.fixture(autouse=True)
def _isolated_user(tmp_path_factory, monkeypatch):
    """Tests never read or write the real user's app settings."""
    monkeypatch.setenv("RTUT_CONFIG_DIR", str(tmp_path_factory.mktemp("rtut-config")))
    monkeypatch.delenv("RTUT_USER", raising=False)
    monkeypatch.setattr("getpass.getuser", lambda: "tester-login")