test_run.py 文件源码

def test_timekeeping():
    # probably a good idea to use a real clock for *one* test anyway...
    TARGET = 0.1
    # give it a few tries in case of random CI server flakiness
    for _ in range(4):
        real_start = time.monotonic()
        with _core.open_cancel_scope() as scope:
            scope.deadline = _core.current_time() + TARGET
            await sleep_forever()
        real_duration = time.monotonic() - real_start
        accuracy = real_duration / TARGET
        print(accuracy)
        # Actual time elapsed should always be >= target time
        # (== is possible because time.monotonic on Windows is really low res)
        if 1.0 <= accuracy < 2:  # pragma: no branch
            break
    else:  # pragma: no cover
        assert False