Function capture

tests/conftest.py:67–70

(fd: int)

    real_close = os.close

    def capture(fd: int) -> None:
        nonlocal locked_fd
        locked_fd = fd
        mocker.patch("filelock._api.os.close", side_effect=close)

    def close(fd: int) -> None:
        # filelock._api.os is the os module, so this patches os.close process-wide. Raise only for the descriptor