@Test fun clientFramePayloadLong() {
    data.write("817f000000000000000548656c6c6f".decodeHex()) // Hello
    clientReader.processNextFrame()
    callback.assertTextMessage("Hello")
  }

  @Test fun clientFramePayloadTooLongThrows() {
    data.write("817f8000000000000000".decodeHex())
    assertFailsWith<ProtocolException> {
      clientReader.processNextFrame()
    }.also { expected ->
      assertThat(expected.message).isEqualTo(