[h264-unidirectional-codec-offer.https.html]
  [Offer to receive a recvonly H264 codec on a recvonly transceiver]
    expected: PRECONDITION_FAILED

  [Offering a recvonly codec on a sendrecv transceiver]
    expected: PRECONDITION_FAILED

  [Offer to send a sendonly H264 codec on a sendonly transceiver]
    expected: PRECONDITION_FAILED