@Test
  fun racingReaders() {
    val pipe = Pipe(1024)
    val sink = pipe.sink.buffer()
    val relay = edit(file, pipe.source, metadata, 5)
    val future1 = executor.submit(sourceReader(relay.newSource()))
    val future2 = executor.submit(sourceReader(relay.newSource()))
    Thread.sleep(500)
    sink.writeUtf8("abcdefghij")
    Thread.sleep(500)
    sink.writeUtf8("klmnopqrst")
    sink.close()

      |
      """.trimMargin(),
    )
  }

  @Test fun headersAddAll() {
    val sourceHeaders =
      Headers.Builder()
        .add("A", "aa")
        .add("a", "aa")
        .add("B", "bb")
        .build()
    val headers =
      Headers.Builder()
        .add("A", "a")
        .addAll(sourceHeaders)
        .add("C", "c")
        .build()