layer1: add managed watcher config

pkg/utils/namespace_manager_test.go

@@ -445,7 +445,12 @@ func TestNewNamespaceWatcherEventHandlers(t *testing.T) {
 func TestPrepareManagedNamespaceWatcher(t *testing.T) {
 	router := &testNamespaceSubscriber{name: "router"}
 	logger := zap.NewNop()
-	manager, handlers, err := PrepareManagedNamespaceWatcher(context.Background(), logger, "router.NSWatcher", []string{"tenant-a"}, NamespaceRemovalStrategyTrackOnly, router)
+	manager, handlers, err := PrepareManagedNamespaceWatcher(context.Background(), logger, ManagedNamespaceWatcherConfig{
+		Component:       "router.NSWatcher",
+		Namespaces:      []string{"tenant-a"},
+		RemovalStrategy: NamespaceRemovalStrategyTrackOnly,
+		Subscriber:      router,
+	})
 	if err != nil {
 		t.Fatalf("expected watcher preparation success: %v", err)
 	}
@@ -466,7 +471,12 @@ func TestRunManagedNamespaceWatcher(t *testing.T) {
 	defer cancel()
 	router := &testNamespaceSubscriber{name: "router"}
 	logger := zap.NewNop()
-	manager, err := RunManagedNamespaceWatcher(ctx, logger, "router.NSWatcher", k8sfake.NewSimpleClientset(), managerPkg.New(), []string{"tenant-a"}, NamespaceRemovalStrategyTrackOnly, router)
+	manager, err := RunManagedNamespaceWatcher(ctx, logger, k8sfake.NewSimpleClientset(), managerPkg.New(), ManagedNamespaceWatcherConfig{
+		Component:       "router.NSWatcher",
+		Namespaces:      []string{"tenant-a"},
+		RemovalStrategy: NamespaceRemovalStrategyTrackOnly,
+		Subscriber:      router,
+	})
 	if err != nil {
 		t.Fatalf("expected managed namespace watcher run success: %v", err)
 	}
@@ -475,6 +485,30 @@ func TestRunManagedNamespaceWatcher(t *testing.T) {
 	}
 }
 
+func TestPrepareManagedNamespaceWatcherDefaultsToTrackOnly(t *testing.T) {
+	router := &testNamespaceSubscriber{name: "router"}
+	logger := zap.NewNop()
+	manager, handlers, err := PrepareManagedNamespaceWatcher(context.Background(), logger, ManagedNamespaceWatcherConfig{
+		Component:  "router.NSWatcher",
+		Namespaces: []string{"tenant-a"},
+		Subscriber: router,
+	})
+	if err != nil {
+		t.Fatalf("expected watcher preparation success: %v", err)
+	}
+	namespace := &corev1.Namespace{}
+	namespace.Name = "tenant-a"
+	namespace.Labels = map[string]string{ManagedNamespaceLabelKey: ManagedNamespaceLabelValue}
+	handlers.DeleteFunc(k8sCache.DeletedFinalStateUnknown{Obj: namespace})
+	record, ok := manager.Get("tenant-a")
+	if !ok || record.Phase != NamespacePhaseRemoved {
+		t.Fatalf("expected default strategy to keep track-only removal semantics")
+	}
+	if router.removeCalls != 0 {
+		t.Fatalf("expected default strategy not to dispatch remove")
+	}
+}
+
 func TestNamespaceManagerSummary(t *testing.T) {
 	manager := NewNamespaceManager()
 	manager.Upsert(NamespaceEvent{Type: NamespaceEventAdd, Name: "tenant-a", Source: NamespaceSourceWatcher})