// This will trigger a close response.
    assertThat(server.processNextFrame()).isFalse()
    server.listener.assertClosing(1000, "Hello!")
    server.webSocket!!.finishReader()
    server.webSocket!!.close(1000, "Goodbye!")
    assertThat(client.processNextFrame()).isFalse()
    client.listener.assertClosing(1000, "Goodbye!")
    client.webSocket!!.finishReader()
    server.listener.assertClosed(1000, "Hello!")

    for (i in 0 until messageCount) {
      serverListener.assertBinaryMessage(message)
    }
    serverListener.assertClosing(1001, "")

    // When the server acknowledges the close the connection shuts down gracefully.
    server.close(1000, null)
    clientListener.assertClosing(1000, "")
    clientListener.assertClosed(1000, "")
    serverListener.assertClosed(1001, "")
  }

  @Test

  fun assertPing(payload: ByteString) {
    assertThat(nextEvent()).isEqualTo(Ping(payload))
  }

  fun assertPong(payload: ByteString) {
    assertThat(nextEvent()).isEqualTo(Pong(payload))
  }

  fun assertClosing(
    code: Int,
    reason: String,
  ) {
    assertThat(nextEvent()).isEqualTo(Closing(code, reason))
  }

  fun assertClosed(
    code: Int,
    reason: String,
  ) {

    clientReader.processNextFrame()
    callback.assertClosing(1000, "Hello")
  }

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

  @Test fun closeOutOfRangeThrows() {