cache.put(3, 20);
    cache.put(6, 2);
    cache.put(98, 45);
    cache.put(56, 76);
    cache.put(23, 84);

    // Replace the two present elements.
    cache.put(23, 20);
    cache.put(56, 49);
    cache.put(23, 2);
    cache.put(56, 4);

    // Expire the two present elements.
    fakeTicker.advance(1001, MILLISECONDS);

    cache.getIfPresent(23);
    cache.getIfPresent(56);

   * errors. The problem was that the logic that decided whether to reuse a route didn't track
   * certain HTTP/2 errors. https://github.com/square/okhttp/issues/5547
   */
  @Test
  fun noRecoveryFromTwoRefusedStreams() {
    server.enqueue(
      MockResponse
        .Builder()
        .onRequestStart(CloseStream(ErrorCode.REFUSED_STREAM.httpCode))
        .build(),

   * Each OkHttpClient used to get its own instance of NullProxySelector, and because these weren't
   * equal their connections weren't pooled. That's a nasty performance bug!
   *
   * https://github.com/square/okhttp/issues/5519
   */
  @Test
  fun connectionPoolingWithFreshClientSamePool() {
    server.enqueue(MockResponse(body = "abc"))
    server.enqueue(MockResponse(body = "def"))
    server.enqueue(MockResponse(body = "ghi"))