del sys.modules[mod_name]
    monkeypatch.setenv("ADMIN_EMAIL", "******@****.***")
    main_mod = importlib.import_module(mod_name)
    return TestClient(main_mod.app)


def test_settings_validation_error(mod_name: str, monkeypatch: MonkeyPatch):
    monkeypatch.delenv("ADMIN_EMAIL", raising=False)
    if mod_name in sys.modules:
        del sys.modules[mod_name]  # pragma: no cover