}

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

  @Test fun closeLengthOfOneThrows() {
    data.write("880100".decodeHex()) // Close with invalid 1-byte payload
    assertFailsWith<ProtocolException> {
      clientReader.processNextFrame()
    }.also { expected ->