@Test fun pingCallsCallback() {
    data.write("890548656c6c6f".decodeHex()) // Ping with "Hello"
    clientReader.processNextFrame()
    callback.assertPing("Hello".encodeUtf8())
  }

  @Test fun emptyCloseCallsCallback() {
    data.write("8800".decodeHex()) // Empty close
    clientReader.processNextFrame()
    callback.assertClosing(1005, "")
  }

  @Test fun closeLengthOfOneThrows() {