pairs += name to value
    }

    assertThat(pairs).containsExactly("a" to "b", "c" to "d")
  }

  @Test fun builderGetOperator() {
    val builder = Headers.Builder()
    builder.add("a", "b")
    builder.add("c", "d")
    assertThat(builder["a"]).isEqualTo("b")
    assertThat(builder["c"]).isEqualTo("d")
    assertThat(builder["e"]).isNull()
  }

  @Test fun builderSetOperator() {

          }

        if (recorded) {
          synchronized(clientEventsList) {
            clientEventsList.add(record.message)

            if (record.loggerName == "javax.net.ssl") {
              val parameters = record.parameters

              if (parameters != null) {
                clientEventsList.add(parameters.first().toString())
              }
            }
          }
        }
      }

  @JvmField
  val calls: MutableList<String> = mutableListOf()

  @Synchronized override fun verify(
    hostname: String,
    session: SSLSession,
  ): Boolean {
    calls.add("verify $hostname")
    return true
  }

  @Test fun connectExceptionsAreReturnedAsSuppressed() {
    val proxySelector = RecordingProxySelector()
    proxySelector.proxies.add(Proxy(Proxy.Type.HTTP, TestUtil.UNREACHABLE_ADDRESS_IPV4))
    proxySelector.proxies.add(Proxy.NO_PROXY)
    server.shutdown()

    client =
      client.newBuilder()
        .proxySelector(proxySelector)
        .readTimeout(Duration.ofMillis(100))

      try {
        val fromSource = from.source().buffer()
        val fromSink = from.sink().buffer()
        hello(fromSource, fromSink)
        acceptCommand(from.inetAddress, fromSource, fromSink)
        openSockets.add(from)
      } catch (e: IOException) {
        logger.log(Level.WARNING, "$name failed", e)
        from.closeQuietly()
      }
    }
  }

  private fun hello(
    fromSource: BufferedSource,

  }

  @Test
  fun headersBuilder() {
    var builder: Headers.Builder = Headers.Builder()
    builder = builder.add("")
    builder = builder.add("", "")
    builder = builder.addUnsafeNonAscii("", "")
    builder = builder.addAll(headersOf())
    builder = builder.add("", Date(0L))
    builder = builder.add("", Instant.EPOCH)
    builder = builder.set("", "")
    builder = builder.set("", Date(0L))

  private val requestBodySinks: BlockingQueue<BufferedSink> = LinkedBlockingQueue()

  override fun contentType(): MediaType? = null

  override fun writeTo(sink: BufferedSink) {
    requestBodySinks.add(sink)
  }

  override fun isDuplex(): Boolean = true

  @Throws(InterruptedException::class)
  fun takeSink(): BufferedSink {
    return requestBodySinks.poll(5, SECONDS) ?: throw AssertionError("no sink to take")

    queueSize += data.size.toLong()
    messageAndCloseQueue.add(Message(formatOpcode, data))
    runWriter()
    return true
  }

  @Synchronized fun pong(payload: ByteString): Boolean {
    // Don't send pongs after we've failed or sent the close frame.
    if (failed || enqueuedClose && messageAndCloseQueue.isEmpty()) return false

    pongQueue.add(payload)
    runWriter()
    return true
  }

    }

    /**
     * Add a trusted root certificate to use when authenticating a peer. Peers must provide
     * a chain of certificates whose root is one of these.
     */
    fun addTrustedCertificate(certificate: X509Certificate) =
      apply {
        this.trustedCertificates += certificate
      }

    /**

 * Access to the `Connection` that carries the request.

### Rewriting Requests

Interceptors can add, remove, or replace request headers. They can also transform the body of those requests that have one. For example, you can use an application interceptor to add request body compression if you're connecting to a webserver known to support it.

```java