[RTCPeerConnection-addTransceiver.html]
  [addTransceiver() with rid containing invalid non-alphanumeric characters should throw TypeError]
    expected: FAIL

  [addTransceiver() with rid longer than 16 characters should throw TypeError]
    expected: FAIL

  [addTransceiver() with readonly ssrc set should throw InvalidAccessError]
    expected: FAIL

  [addTransceiver() with readonly rtx set should throw InvalidAccessError]
    expected: FAIL

  [addTransceiver() with readonly fec set should throw InvalidAccessError]
    expected: FAIL