* and returns it.
   */
  fun <T : ConnectionEvent> removeUpToEvent(eventClass: Class<T>): T {
    val fullEventSequence = eventSequence.toList()
    try {
      while (true) {
        val event = takeEvent()
        if (eventClass.isInstance(event)) {
          return eventClass.cast(event)
        }
      }
    } catch (e: NoSuchElementException) {
      throw AssertionError("full event sequence: $fullEventSequence", e)

   * and returns it.
   */
  fun <T : CallEvent> removeUpToEvent(eventClass: Class<T>): T {
    val fullEventSequence = eventSequence.toList()
    try {
      while (true) {
        val event = takeEvent()
        if (eventClass.isInstance(event)) {
          return eventClass.cast(event)
        }
      }
    } catch (e: NoSuchElementException) {
      throw AssertionError("full event sequence: $fullEventSequence", e)

    listener.takeEvent(CallStart::class.java, 0L)
    listener.takeEvent(ConnectionAcquired::class.java, applicationInterceptorDelay)
    listener.takeEvent(RequestHeadersStart::class.java, networkInterceptorDelay)
    listener.takeEvent(RequestHeadersEnd::class.java, 0L)
    listener.takeEvent(RequestBodyStart::class.java, 0L)
    listener.takeEvent(RequestBodyEnd::class.java, requestBodyDelay)

    // Verify the peer received what was expected.
    assertThat(peer.takeFrame().type).isEqualTo(Http2.TYPE_HEADERS)
    assertThat(observer.takeEvent()).isEqualTo(expectedRequestHeaders)
    assertThat(observer.takeEvent()).isEqualTo(expectedResponseHeaders)
  }

  @Test fun doublePushPromise() {
    // Write the mocking script.
    peer.sendFrame().settings(Settings())