Function spawn_child_process

tests/utils.py:88–110

(
    python: str, test_file: str, tmpdir: pathlib.Path
)

@contextlib.contextmanager
def spawn_child_process(
    python: str, test_file: str, tmpdir: pathlib.Path
) -> Generator["subprocess.Popen[str]", None, None]:
    fifo = tmpdir / "the_fifo"
    os.mkfifo(fifo)
    with subprocess.Popen(
        [python, test_file, str(fifo)],
        stdout=subprocess.PIPE,
        stderr=subprocess.PIPE,
        text=True,
    ) as process:
        with open(fifo, "r") as fifo_file:
            response = fifo_file.read()

        assert response == "ready"
        time.sleep(0.1)
        try:
            yield process
        finally:
            os.remove(fifo)
            process.terminate()
            process.kill()
            process.wait(timeout=TIMEOUT)


@contextlib.contextmanager