assertThat(source!!.read(sourceBuffer, 5)).isEqualTo(5)
    assertThat(sourceBuffer.readUtf8()).isEqualTo("abcde")
    assertThat(source.read(sourceBuffer, 1024)).isEqualTo(8)
    assertThat(sourceBuffer.readUtf8()).isEqualTo("fghijklm")
    assertThat(source.read(sourceBuffer, 1024)).isEqualTo(-1)
    assertThat(sourceBuffer.size).isEqualTo(0)
    source.close()
    assertThat(relay.isClosed).isTrue()

        .bodyDelay(responseBodyStartDelay, TimeUnit.MILLISECONDS)
        .throttleBody(5, responseBodyEndDelay, TimeUnit.MILLISECONDS)
        .body("fghijk")
        .build(),
    )
    call.execute().use { response ->
      assertThat(response.body.string()).isEqualTo("fghijk")
    }

    // Confirm the events occur when expected.
    listener.takeEvent(CallStart::class.java, 0L)

  @ArgumentsSource(ProtocolParamProvider::class)
  fun connectionReuse(protocol: Protocol) {
    setUp(protocol)
    server.enqueue(MockResponse(body = "ABCDEF"))
    server.enqueue(MockResponse(body = "GHIJKL"))
    val call1 = client.newCall(Request(server.url("/r1")))
    val call2 = client.newCall(Request(server.url("/r1")))
    val response1 = call1.execute()
    val response2 = call2.execute()