)

func TestSingleRoundtrip(t *testing.T) {
	defer testlogger.T.SetLogTB(t)()
	errFatal := func(err error) {
		t.Helper()
		if err != nil {
			t.Fatal(err)
		}
	}
	grid, err := SetupTestGrid(2)
	errFatal(err)
	remoteHost := grid.Hosts[1]
	local := grid.Managers[0]

	// 1: Echo
	errFatal(local.RegisterSingleHandler(handlerTest, func(payload []byte) ([]byte, *RemoteErr) {