add: add a test case for Activate

pkg/scheduler/backend/queue/scheduling_queue_test.go

@@ -1292,13 +1292,17 @@ func TestPriorityQueue_Delete(t *testing.T) {
 }
 
 func TestPriorityQueue_Activate(t *testing.T) {
+	metrics.Register()
 	tests := []struct {
 		name                        string
 		qPodInfoInUnschedulablePods []*framework.QueuedPodInfo
 		qPodInfoInPodBackoffQ       []*framework.QueuedPodInfo
 		qPodInActiveQ               []*v1.Pod
 		qPodInfoToActivate          *framework.QueuedPodInfo
+		qPodInInFlightPod           *v1.Pod
+		expectedInFlightEvent       *clusterEvent
 		want                        []*framework.QueuedPodInfo
+		qHintEnabled                bool
 	}{
 		{
 			name:               "pod already in activeQ",
@@ -1311,6 +1315,21 @@ func TestPriorityQueue_Activate(t *testing.T) {
 			qPodInfoToActivate: &framework.QueuedPodInfo{PodInfo: highPriNominatedPodInfo},
 			want:               []*framework.QueuedPodInfo{},
 		},
+		{
+			name:                  "[QHint] pod not in unschedulablePods/podBackoffQ but in-flight",
+			qPodInfoToActivate:    &framework.QueuedPodInfo{PodInfo: highPriNominatedPodInfo},
+			qPodInInFlightPod:     highPriNominatedPodInfo.Pod,
+			expectedInFlightEvent: &clusterEvent{oldObj: (*v1.Pod)(nil), newObj: highPriNominatedPodInfo.Pod, event: framework.EventForceActivate},
+			want:                  []*framework.QueuedPodInfo{},
+			qHintEnabled:          true,
+		},
+		{
+			name:               "[QHint] pod not in unschedulablePods/podBackoffQ and not in-flight",
+			qPodInfoToActivate: &framework.QueuedPodInfo{PodInfo: highPriNominatedPodInfo},
+			qPodInInFlightPod:  medPriorityPodInfo.Pod, // different pod is in-flight
+			want:               []*framework.QueuedPodInfo{},
+			qHintEnabled:       true,
+		},
 		{
 			name:                        "pod in unschedulablePods",
 			qPodInfoInUnschedulablePods: []*framework.QueuedPodInfo{{PodInfo: highPriNominatedPodInfo}},
@@ -1327,12 +1346,30 @@ func TestPriorityQueue_Activate(t *testing.T) {
 
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
+			featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.SchedulerQueueingHints, tt.qHintEnabled)
 			var objs []runtime.Object
 			logger, ctx := ktesting.NewTestContext(t)
 			ctx, cancel := context.WithCancel(ctx)
 			defer cancel()
 			q := NewTestQueueWithObjects(ctx, newDefaultQueueSort(), objs)
 
+			if tt.qPodInInFlightPod != nil {
+				// Put -> Pop the Pod to make it registered in inFlightPods.
+				q.activeQ.underLock(func(unlockedActiveQ unlockedActiveQueuer) {
+					unlockedActiveQ.AddOrUpdate(newQueuedPodInfoForLookup(tt.qPodInInFlightPod))
+				})
+				p, err := q.activeQ.pop(logger)
+				if err != nil {
+					t.Fatalf("Pop failed: %v", err)
+				}
+				if p.Pod.Name != tt.qPodInInFlightPod.Name {
+					t.Errorf("Unexpected popped pod: %v", p.Pod.Name)
+				}
+				if len(q.activeQ.listInFlightEvents()) != 1 {
+					t.Fatal("Expected the pod to be recorded in in-flight events, but it doesn't")
+				}
+			}
+
 			// Prepare activeQ/unschedulablePods/podBackoffQ according to the table
 			for _, qPod := range tt.qPodInActiveQ {
 				q.Add(logger, qPod)
@@ -1351,7 +1388,29 @@ func TestPriorityQueue_Activate(t *testing.T) {
 
 			// Check the result after activation by the length of activeQ
 			if wantLen := len(tt.want); q.activeQ.len() != wantLen {
-				t.Errorf("length compare: want %v, got %v", wantLen, q.activeQ.len())
+				t.Fatalf("length compare: want %v, got %v", wantLen, q.activeQ.len())
+			}
+
+			if tt.expectedInFlightEvent != nil {
+				if len(q.activeQ.listInFlightEvents()) != 2 {
+					t.Fatalf("Expected two in-flight event to be recorded, but got %v events", len(q.activeQ.listInFlightEvents()))
+				}
+				found := false
+				for _, e := range q.activeQ.listInFlightEvents() {
+					event, ok := e.(*clusterEvent)
+					if !ok {
+						continue
+					}
+
+					if d := cmp.Diff(tt.expectedInFlightEvent, event, cmpopts.EquateComparable(clusterEvent{})); d != "" {
+						t.Fatalf("Unexpected in-flight event (-want, +got):\n%s", d)
+					}
+					found = true
+				}
+
+				if !found {
+					t.Fatalf("Expected in-flight event to be recorded, but it wasn't.")
+				}
 			}
 
 			// Check if the specific pod exists in activeQ