add tests for NewFilteredDynamicSharedInformerFactory namespace

Signed-off-by: Wayne Witzel III <witzelw@vmware.com>

Kubernetes-commit: 2064d90e92430f96e440cfc4fc03a69b4243bc6c

dynamic/dynamicinformer/informer_test.go

@@ -32,6 +32,99 @@ import (
 	"k8s.io/client-go/tools/cache"
 )
 
+type triggerFunc func(gvr schema.GroupVersionResource, ns string, fakeClient *fake.FakeDynamicClient, testObject *unstructured.Unstructured) *unstructured.Unstructured
+
+func triggerFactory(t *testing.T) triggerFunc {
+	return func(gvr schema.GroupVersionResource, ns string, fakeClient *fake.FakeDynamicClient, _ *unstructured.Unstructured) *unstructured.Unstructured {
+		testObject := newUnstructured("apps/v1", "Deployment", "ns-foo", "name-foo")
+		createdObj, err := fakeClient.Resource(gvr).Namespace(ns).Create(context.TODO(), testObject, metav1.CreateOptions{})
+		if err != nil {
+			t.Error(err)
+		}
+		return createdObj
+	}
+}
+
+func handler(rcvCh chan<- *unstructured.Unstructured) *cache.ResourceEventHandlerFuncs {
+	return &cache.ResourceEventHandlerFuncs{
+		AddFunc: func(obj interface{}) {
+			rcvCh <- obj.(*unstructured.Unstructured)
+		},
+	}
+}
+
+func TestFilteredDynamicSharedInformerFactory(t *testing.T) {
+	scenarios := []struct {
+		name        string
+		existingObj *unstructured.Unstructured
+		gvr         schema.GroupVersionResource
+		informNS    string
+		ns          string
+		trigger     func(gvr schema.GroupVersionResource, ns string, fakeClient *fake.FakeDynamicClient, testObject *unstructured.Unstructured) *unstructured.Unstructured
+		handler     func(rcvCh chan<- *unstructured.Unstructured) *cache.ResourceEventHandlerFuncs
+	}{
+		// scenario 1
+		{
+			name:     "scenario 1: test adding an object in different namespace should not trigger AddFunc",
+			informNS: "ns-bar",
+			ns:       "ns-foo",
+			gvr:      schema.GroupVersionResource{Group: "apps", Version: "v1", Resource: "deployments"},
+			trigger:  triggerFactory(t),
+			handler:  handler,
+		},
+		// scenario 2
+		{
+			name:     "scenario 2: test adding an object should trigger AddFunc",
+			informNS: "ns-foo",
+			ns:       "ns-foo",
+			gvr:      schema.GroupVersionResource{Group: "apps", Version: "v1", Resource: "deployments"},
+			trigger:  triggerFactory(t),
+			handler:  handler,
+		},
+	}
+
+	for _, ts := range scenarios {
+		t.Run(ts.name, func(t *testing.T) {
+			// test data
+			timeout := time.Duration(3 * time.Second)
+			ctx, cancel := context.WithTimeout(context.Background(), timeout)
+			defer cancel()
+			scheme := runtime.NewScheme()
+			informerReciveObjectCh := make(chan *unstructured.Unstructured, 1)
+			objs := []runtime.Object{}
+			if ts.existingObj != nil {
+				objs = append(objs, ts.existingObj)
+			}
+			fakeClient := fake.NewSimpleDynamicClient(scheme, objs...)
+			target := dynamicinformer.NewFilteredDynamicSharedInformerFactory(fakeClient, 0, ts.informNS, nil)
+
+			// act
+			informerListerForGvr := target.ForResource(ts.gvr)
+			informerListerForGvr.Informer().AddEventHandler(ts.handler(informerReciveObjectCh))
+			target.Start(ctx.Done())
+			if synced := target.WaitForCacheSync(ctx.Done()); !synced[ts.gvr] {
+				t.Errorf("informer for %s hasn't synced", ts.gvr)
+			}
+
+			testObject := ts.trigger(ts.gvr, ts.ns, fakeClient, ts.existingObj)
+			select {
+			case objFromInformer := <-informerReciveObjectCh:
+				if ts.ns != ts.informNS {
+					t.Errorf("informer received an object for namespace %s when watching namespace %s", ts.ns, ts.informNS)
+				}
+				if !equality.Semantic.DeepEqual(testObject, objFromInformer) {
+					t.Fatalf("%v", diff.ObjectDiff(testObject, objFromInformer))
+				}
+			case <-ctx.Done():
+				if ts.ns == ts.informNS {
+					t.Errorf("tested informer haven't received an object, waited %v", timeout)
+				}
+			}
+		})
+	}
+
+}
+
 func TestDynamicSharedInformerFactory(t *testing.T) {
 	scenarios := []struct {
 		name        string