Class MyFileLock

tests/test_filelock.py:791–803

def test_subclass_compatibility(tmp_path: Path) -> None:
    class MyFileLock(FileLock):
        def __init__(
            self,
            lock_file: str | os.PathLike[str],
            timeout: float = -1,
            mode: int = 0o644,
            thread_local: bool = True,
            my_param: int = 0,
            **kwargs: dict[str, Any],  # ruff:ignore[unused-method-argument]  # matches the base constructor signature; extras are dropped
        ) -> None:
            super().__init__(lock_file, timeout, mode, thread_local, is_singleton=True)
            self.blocking = True
            self.my_param = my_param

    lock_path = tmp_path / "a"
    MyFileLock(str(lock_path), my_param=1)