layer1: centralize namespace watcher handlers

pkg/utils/namespace_manager_test.go

@@ -7,6 +7,7 @@ import (
 	"testing"
 	"time"
 
+	"go.uber.org/zap"
 	corev1 "k8s.io/api/core/v1"
 	k8sCache "k8s.io/client-go/tools/cache"
 )
@@ -337,6 +338,32 @@ func TestRecordNamespaceRemoval(t *testing.T) {
 	}
 }
 
+func TestHandleWatcherNamespaceAddUpdateDelete(t *testing.T) {
+	manager := NewNamespaceManager()
+	router := &testNamespaceSubscriber{name: "router"}
+	manager.Subscribe(router)
+	logger := zap.NewNop()
+	namespace := &corev1.Namespace{}
+	namespace.Name = "tenant-a"
+	namespace.Labels = map[string]string{ManagedNamespaceLabelKey: ManagedNamespaceLabelValue}
+
+	HandleWatcherNamespaceAdd(context.Background(), logger, "router.NSWatcher", manager, namespace)
+	if router.addCalls != 1 {
+		t.Fatalf("expected add handler to dispatch add")
+	}
+
+	HandleWatcherNamespaceUpdate(context.Background(), logger, "router.NSWatcher", manager, namespace, namespace)
+	if router.resyncCalls != 1 {
+		t.Fatalf("expected update handler to dispatch resync")
+	}
+
+	HandleWatcherNamespaceDelete(logger, "router.NSWatcher", manager, k8sCache.DeletedFinalStateUnknown{Obj: namespace})
+	record, ok := manager.Get("tenant-a")
+	if !ok || record.Phase != NamespacePhaseRemoved {
+		t.Fatalf("expected delete handler to mark namespace removed")
+	}
+}
+
 func TestNamespaceManagerDispatchAdd(t *testing.T) {
 	manager := NewNamespaceManager()
 	manager.Upsert(NamespaceEvent{Type: NamespaceEventAdd, Name: "tenant-a", Source: NamespaceSourceWatcher})