peer.play()

    // Play it back.
    val connection = connect(peer)
    val stream = connection.newStream(headerEntries("b", "banana"), true)
    val out = stream.sink.buffer()
    out.writeUtf8("c3po")
    out.close()
    assertThat(stream.takeHeaders()).isEqualTo(headersOf("a", "android"))
    assertStreamData("robot", stream.source)
    connection.writePingAndAwaitPong()