layer1: share namespace watcher event handlers

pkg/utils/namespace_manager_test.go

@@ -406,6 +406,29 @@ func TestHandleWatcherNamespaceUpdateDispatchRemoval(t *testing.T) {
 	}
 }
 
+func TestNewNamespaceWatcherEventHandlers(t *testing.T) {
+	manager := NewNamespaceManager()
+	router := &testNamespaceSubscriber{name: "router"}
+	manager.Subscribe(router)
+	logger := zap.NewNop()
+	handlers := NewNamespaceWatcherEventHandlers(context.Background(), logger, "router.NSWatcher", manager, NamespaceRemovalStrategyTrackOnly)
+	namespace := &corev1.Namespace{}
+	namespace.Name = "tenant-a"
+	namespace.Labels = map[string]string{ManagedNamespaceLabelKey: ManagedNamespaceLabelValue}
+
+	handlers.AddFunc(namespace)
+	handlers.UpdateFunc(namespace, namespace)
+	handlers.DeleteFunc(k8sCache.DeletedFinalStateUnknown{Obj: namespace})
+
+	record, ok := manager.Get("tenant-a")
+	if !ok || record.Phase != NamespacePhaseRemoved {
+		t.Fatalf("expected watcher event handlers to drive namespace lifecycle")
+	}
+	if router.addCalls != 1 || router.resyncCalls != 1 {
+		t.Fatalf("expected add and resync calls through event handlers")
+	}
+}
+
 func TestNamespaceManagerDispatchAdd(t *testing.T) {
 	manager := NewNamespaceManager()
 	manager.Upsert(NamespaceEvent{Type: NamespaceEventAdd, Name: "tenant-a", Source: NamespaceSourceWatcher})