assert captured_exception.exception is not None
    error_str = str(captured_exception.exception)
    assert "subapp_websocket_endpoint" in error_str
    assert "/sub/ws/" in error_str


def test_validation_error_with_only_path():
    errors = [{"type": "missing", "loc": ("body", "name"), "msg": "Field required"}]
    exc = RequestValidationError(errors, endpoint_ctx={"path": "GET /api/test"})
    error_str = str(exc)