swarm/network/simulation: fix New function for-loop scope (#18161)

swarm/network/simulation/node_test.go

@@ -160,6 +160,41 @@ func TestAddNodeWithService(t *testing.T) {
 	}
 }
 
+func TestAddNodeMultipleServices(t *testing.T) {
+	sim := New(map[string]ServiceFunc{
+		"noop1": noopServiceFunc,
+		"noop2": noopService2Func,
+	})
+	defer sim.Close()
+
+	id, err := sim.AddNode()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	n := sim.Net.GetNode(id).Node.(*adapters.SimNode)
+	if n.Service("noop1") == nil {
+		t.Error("service noop1 not found on node")
+	}
+	if n.Service("noop2") == nil {
+		t.Error("service noop2 not found on node")
+	}
+}
+
+func TestAddNodeDuplicateServiceError(t *testing.T) {
+	sim := New(map[string]ServiceFunc{
+		"noop1": noopServiceFunc,
+		"noop2": noopServiceFunc,
+	})
+	defer sim.Close()
+
+	wantErr := "duplicate service: *simulation.noopService"
+	_, err := sim.AddNode()
+	if err.Error() != wantErr {
+		t.Errorf("got error %q, want %q", err, wantErr)
+	}
+}
+
 func TestAddNodes(t *testing.T) {
 	sim := New(noopServiceFuncMap)
 	defer sim.Close()