[RTCDataChannel-bufferedAmount.html]
  [bufferedAmount should increase to byte length of encoded unicode string sent]
    expected: FAIL

  [bufferedAmount should increase to byte length of buffer sent]
    expected: FAIL

  [bufferedAmount should increase to size of blob sent]
    expected: FAIL

  [bufferedAmount should increase by byte length for each message sent]
    expected: FAIL

