async def METHOD_NAME(mplex_stream_pair):
    stream_0, stream_1 = mplex_stream_pair
    await stream_0.reset()
    await trio.sleep(0.01)
    # Both sides are closed.
    assert stream_0.event_local_closed.is_set()
    assert stream_1.event_local_closed.is_set()
    assert stream_0.event_remote_closed.is_set()
    assert stream_1.event_remote_closed.is_set()
    # Streams are removed from their `mplex_conn`.
    assert stream_0 not in stream_0.muxed_conn.streams.values()
    assert stream_1 not in stream_1.muxed_conn.streams.values()
    # `close` should do nothing.
    await stream_0.close()
    await stream_1.close()
    # `reset` should do nothing as well.
    await stream_0.reset()
    await stream_1.reset()