.build()
    assertThat(body.boundary).isEqualTo("123")
    assertThat(body.type).isEqualTo(MultipartBody.MIXED)
    assertThat(body.contentType().toString())
      .isEqualTo("multipart/mixed; boundary=123")
    assertThat(body.parts.size).isEqualTo(1)
    assertThat(body.contentLength()).isEqualTo(33L)
    val buffer = Buffer()
    body.writeTo(buffer)
    assertThat(body.contentLength()).isEqualTo(buffer.size)

    val set: MutableSet<Any> = CopyOnWriteArraySet()
    assertThat(set.add(ConnectionSpec.MODERN_TLS)).isTrue()
    assertThat(set.add(ConnectionSpec.COMPATIBLE_TLS)).isTrue()
    assertThat(set.add(ConnectionSpec.CLEARTEXT)).isTrue()
    assertThat(set.add(allTlsVersions)).isTrue()
    assertThat(set.add(allCipherSuites)).isTrue()
    allCipherSuites.hashCode()
    assertThat(allCipherSuites.equals(null)).isFalse()

    hpackWriter!!.writeHeaders(headerBlock)
    assertThat(bytesOut).isEqualTo(bytesIn)
    assertThat(hpackWriter!!.headerCount).isEqualTo(1)
    val entry = hpackWriter!!.dynamicTable[hpackWriter!!.dynamicTable.size - 1]!!
    checkEntry(entry, "custom-key", "custom-header", 55)
    hpackReader!!.readHeaders()
    assertThat(hpackReader!!.headerCount).isEqualTo(1)
    assertThat(hpackReader!!.getAndResetHeaderList()).isEqualTo(headerBlock)

    assertThat(request.header("User-Agent")).isNull()
    assertThat(request.header("Host")).isNull()
    assertThat(request.header("Accept-Encoding")).isNull()

    // No extra headers in the application's response.
    val response = client.newCall(request).execute()
    assertThat(request.header("Content-Encoding")).isNull()
    assertThat(response.body.string()).isEqualTo("abcabcabc")
  }

  @Test

      )

    assertThat(handshake.tlsVersion).isEqualTo(TlsVersion.TLS_1_3)
    assertThat(handshake.cipherSuite).isEqualTo(CipherSuite.TLS_AES_128_GCM_SHA256)
    assertThat(handshake.peerCertificates).containsExactly(
      serverCertificate.certificate,
      serverIntermediate.certificate,
    )
    assertThat(handshake.localPrincipal).isNull()
    assertThat(handshake.peerPrincipal)

    client.webSocket!!.close(1000, "Hello!")
    assertThat(client.webSocket!!.close(1000, "Hello!")).isFalse()
    assertThat(client.webSocket!!.send("Hello!")).isFalse()
  }

  @Test
  fun clientCloseWith0Fails() {
    assertFailsWith<IllegalArgumentException> {
      client.webSocket!!.close(0, null)
    }.also { expected ->
      assertThat("Code must be in range [1000,5000): 0")

    assertThat(socket.isHealthy(socketSource)).isTrue()

    serverSocket.close()
    assertThat(socket.isHealthy(socketSource)).isFalse()
  }

  @Test
  fun testDurationTimeUnit() {
    assertThat(checkDuration("timeout", 0, TimeUnit.MILLISECONDS)).isEqualTo(0)
    assertThat(checkDuration("timeout", 1, TimeUnit.MILLISECONDS)).isEqualTo(1)

    assertThat(
      assertThrows<IllegalStateException> {

        .build()

    executeSynchronously(request)
      .assertFailureMatches("stream was reset: REFUSED_STREAM")

    assertThat(client.routeDatabase.failedRoutes).isEmpty()
    assertThat(server1.requestCount).isEqualTo(1)
    assertThat(server2.requestCount).isEqualTo(0)

    assertThat(clientTestRule.recordedConnectionEventTypes()).containsExactly(
      "ConnectStart",
      "ConnectEnd",
      "ConnectionAcquired",

    val response = call.execute()
    assertThat(response.body.string()).isEqualTo("hello from IPv4")

    // In the process we made one successful connection attempt.
    assertThat(listener.recordedEventTypes().filter { it == "ConnectStart" }).hasSize(2)
    assertThat(listener.recordedEventTypes().filter { it == "ConnectFailed" }).hasSize(1)
    assertThat(listener.recordedEventTypes().filter { it == "ConnectEnd" }).hasSize(1)

    assertThat(dispatcher.queuedCalls()).isEmpty()
    assertThat(a1.isExecuted()).isTrue()
    assertThat(a1.isCanceled()).isFalse()
    assertThat(a2.isExecuted()).isTrue()
    assertThat(a2.isCanceled()).isTrue()
    assertThat(a3.isExecuted()).isFalse()
    assertThat(a3.isCanceled()).isTrue()
    assertThat(a4.isExecuted()).isFalse()
    assertThat(a4.isCanceled()).isFalse()
  }

  @Test