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"},

    peer.play()

    // Play it back.
    val connection = connect(peer)
    val stream1 = connection.newStream(headerEntries("a", "apple"), true)
    val out1 = stream1.sink.buffer()
    out1.write(ByteArray(Settings.DEFAULT_INITIAL_WINDOW_SIZE))
    out1.flush()

    // Check that we've filled the window for both the stream and also the connection.
    assertThat(connection.writeBytesTotal)

		result[i] = string(v)
	}
	return result
}

func collect(t *testing.T, seq iter.Seq[[]byte]) [][]byte {
	out := slices.Collect(seq)
	out1 := slices.Collect(seq)
	if !slices.Equal(sliceOfString(out), sliceOfString(out1)) {
		t.Fatalf("inconsistent seq:\n%s\n%s", out, out1)
	}
	return out
}

type LinesTest struct {
	a string
	b []string
}

var linesTests = []LinesTest{

    csession->SetOutputs(grad_outputs_vec);
    csession->Run(s_);
    ASSERT_EQ(TF_OK, TF_GetCode(s_)) << TF_Message(s_);
    TF_Tensor* out0 = csession->output_tensor(0);
    TF_Tensor* out1 = csession->output_tensor(1);

    std::vector<TF_Output> expected_grad_outputs_vec;
    expected_grad_outputs_vec.assign(expected_grad_outputs,
                                     expected_grad_outputs + 2);