data.write("880703e948656c6c6f".decodeHex()) // Close with code and reason
    data.close()
    clientReader.processNextFrame()
    callback.assertClosing(1001, "Hello")
  }

  @Test fun closeOutOfRangeThrows() {
    data.write("88020001".decodeHex()) // Close with code 1
    assertFailsWith<ProtocolException> {
      clientReader.processNextFrame()
    }.also { expected ->
      assertThat(expected.message)