
    const receiver1 = pc.getReceivers()[0];
    const receiver2 = pc.getReceivers()[1];

    sender1.transform = senderTransform;
    receiver1.transform = receiverTransform;
    assert_throws_dom("InvalidStateError", () => sender2.transform = senderTransform);
    assert_throws_dom("InvalidStateError", () => receiver2.transform = receiverTransform);

    sender1.transform = senderTransform;
    receiver1.transform = receiverTransform;

    sender1.transform = null;
    receiver1.transform = null;
}, "Cann