// Another stream should be able to send data even though 1 is blocked.
    val stream2 = connection.newStream(headerEntries("b", "banana"), true)
    val out2 = stream2.getSink().buffer()
    out2.writeUtf8("foo")
    out2.flush()
    assertThat(connection.writeBytesTotal)
      .isEqualTo((Settings.DEFAULT_INITIAL_WINDOW_SIZE + 3).toLong())
    assertThat(connection.writeBytesMaximum)

  Define(-1, {}, {feed1, feed2}, {add, add}, {"out1", "out2"});

  // Use, run, and verify
  TF_Operation* two = ScalarConst(2, host_graph_, s_);
  TF_Operation* func_feed = Placeholder(host_graph_, s_);
  TF_Operation* func_op = Use({two, func_feed});
  Run({{func_feed, Int32Tensor(3)}}, {{func_op, 0}, {func_op, 1}}, {5, 5});
  VerifyFDef({"add"}, M({{"feed1"}, {"feed2"}}), M({{"out1"}, {"out2"}}),
             {{"feed1", "add:0"},