Method start

src/click/testing.py:100–103

(self)

        self._tmpfile = None

    def start(self) -> None:
        self.saved_fd = os.dup(self._targetfd)
        self._tmpfile = tempfile.TemporaryFile(buffering=0)
        os.dup2(self._tmpfile.fileno(), self._targetfd)

    def stop(self) -> bytes:
        assert self._tmpfile is not None, class="st">"_FDCapture.start() was not called"