* begin sending response data before all request data has been received.
 *
 * See [okhttp3.RequestBody.isDuplex].
 */
public interface SocketHandler {
  public fun handle(socket: Socket)

  @Test
  fun upgrade() {
    val socketHandler =
      MockSocketHandler()
        .apply {
          receiveRequest("client says hello\n")
          sendResponse("server says hello\n")
          receiveRequest("client says goodbye\n")
          sendResponse("server says goodbye\n")
          exhaustResponse()
          exhaustRequest()
        }
    server.enqueue(socketHandler.upgradeResponse())

    client

import java.io.IOException
import java.util.concurrent.CountDownLatch
import java.util.concurrent.FutureTask
import java.util.concurrent.LinkedBlockingQueue
import java.util.concurrent.TimeUnit
import mockwebserver3.SocketHandler
import okhttp3.internal.connection.BufferedSocket
import okhttp3.internal.connection.asBufferedSocket
import okio.Socket
import okio.utf8Size

private typealias Action = (BufferedSocket) -> Unit

/**