Merge pull request #51759 from wackxu/addtestcase

Automatic merge from submit-queue (batch tested with PRs 51759, 53001, 52806). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>..

add verify case in index_test.go

**What this PR does / why we need it**:

There only verify the length of the result in the index_test and we should  also verify the content of the result.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

staging/src/k8s.io/client-go/tools/cache/index_test.go

@@ -77,6 +77,11 @@ func TestMultiIndexKeys(t *testing.T) {
 	if len(erniePods) != 2 {
 		t.Errorf("Expected 2 pods but got %v", len(erniePods))
 	}
+	for _, erniePod := range erniePods {
+		if erniePod.(*v1.Pod).Name != "one" && erniePod.(*v1.Pod).Name != "tre" {
+			t.Errorf("Expected only 'one' or 'tre' but got %s", erniePod.(*v1.Pod).Name)
+		}
+	}
 
 	bertPods, err := index.ByIndex("byUser", "bert")
 	if err != nil {
@@ -85,6 +90,11 @@ func TestMultiIndexKeys(t *testing.T) {
 	if len(bertPods) != 2 {
 		t.Errorf("Expected 2 pods but got %v", len(bertPods))
 	}
+	for _, bertPod := range bertPods {
+		if bertPod.(*v1.Pod).Name != "one" && bertPod.(*v1.Pod).Name != "two" {
+			t.Errorf("Expected only 'one' or 'two' but got %s", bertPod.(*v1.Pod).Name)
+		}
+	}
 
 	oscarPods, err := index.ByIndex("byUser", "oscar")
 	if err != nil {
@@ -93,6 +103,11 @@ func TestMultiIndexKeys(t *testing.T) {
 	if len(oscarPods) != 1 {
 		t.Errorf("Expected 1 pods but got %v", len(erniePods))
 	}
+	for _, oscarPod := range oscarPods {
+		if oscarPod.(*v1.Pod).Name != "two" {
+			t.Errorf("Expected only 'two' but got %s", oscarPod.(*v1.Pod).Name)
+		}
+	}
 
 	ernieAndBertKeys, err := index.Index("byUser", pod1)
 	if err != nil {
@@ -101,6 +116,11 @@ func TestMultiIndexKeys(t *testing.T) {
 	if len(ernieAndBertKeys) != 3 {
 		t.Errorf("Expected 3 pods but got %v", len(ernieAndBertKeys))
 	}
+	for _, ernieAndBertKey := range ernieAndBertKeys {
+		if ernieAndBertKey.(*v1.Pod).Name != "one" && ernieAndBertKey.(*v1.Pod).Name != "two" && ernieAndBertKey.(*v1.Pod).Name != "tre" {
+			t.Errorf("Expected only 'one', 'two' or 'tre' but got %s", ernieAndBertKey.(*v1.Pod).Name)
+		}
+	}
 
 	index.Delete(pod3)
 	erniePods, err = index.ByIndex("byUser", "ernie")
@@ -110,6 +130,12 @@ func TestMultiIndexKeys(t *testing.T) {
 	if len(erniePods) != 1 {
 		t.Errorf("Expected 1 pods but got %v", len(erniePods))
 	}
+	for _, erniePod := range erniePods {
+		if erniePod.(*v1.Pod).Name != "one" {
+			t.Errorf("Expected only 'one' but got %s", erniePod.(*v1.Pod).Name)
+		}
+	}
+
 	elmoPods, err := index.ByIndex("byUser", "elmo")
 	if err != nil {
 		t.Errorf("unexpected error: %v", err)
@@ -128,5 +154,10 @@ func TestMultiIndexKeys(t *testing.T) {
 	if len(bertPods) != 1 {
 		t.Errorf("Expected 1 pods but got %v", len(bertPods))
 	}
+	for _, bertPod := range bertPods {
+		if bertPod.(*v1.Pod).Name != "one" {
+			t.Errorf("Expected only 'one' but got %s", bertPod.(*v1.Pod).Name)
+		}
+	}
 
 }