errFatal := func(err error) {
		b.Helper()
		if err != nil {
			b.Fatal(err)
		}
	}
	rpc := NewSingleHandler[*testRequest, *testResponse](handlerTest2, newTestRequest, newTestResponse)
	grid, err := SetupTestGrid(n)
	errFatal(err)
	b.Cleanup(grid.Cleanup)
	// Create n managers.
	for _, remote := range grid.Managers {
		// Register a single handler which echos the payload.

		}
	}
}

func newStorageRESTHTTPServerClient(t testing.TB) *storageRESTClient {
	// Grid with 2 hosts
	tg, err := grid.SetupTestGrid(2)
	if err != nil {
		t.Fatalf("SetupTestGrid: %v", err)
	}
	t.Cleanup(tg.Cleanup)
	prevHost, prevPort := globalMinioHost, globalMinioPort
	defer func() {
		globalMinioHost, globalMinioPort = prevHost, prevPort
	}()

)

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) {