fix: fix apply work controller integration test

pkg/controllers/work/apply_controller_integration_test.go

@@ -610,7 +610,9 @@ var _ = Describe("Work Controller", func() {
 		})
 	})
 
-	Context("Test multiple work propagation", func() {
+	// This test will set the work controller to leave and then join again.
+	// It cannot run parallel with other tests.
+	Context("Test multiple work propagation", Serial, func() {
 		var works []*fleetv1beta1.Work
 
 		AfterEach(func() {
@@ -678,7 +680,10 @@ var _ = Describe("Work Controller", func() {
 				Expect(k8sClient.Get(ctx, types.NamespacedName{Name: works[i].GetName(), Namespace: testWorkNamespace}, &resultWork)).Should(Succeed())
 				Expect(controllerutil.ContainsFinalizer(&resultWork, fleetv1beta1.WorkFinalizer)).Should(BeFalse())
 				// make sure that leave can be called as many times as possible
-				Expect(workController.Leave(ctx)).Should(Succeed())
+				// The work may be updated and may hit 409 error.
+				Eventually(func() error {
+					return workController.Leave(ctx)
+				}, timeout, interval).Should(Succeed(), "Failed to set the work controller to leave")
 				By(fmt.Sprintf("change the work = %s", work.GetName()))
 				cm = &corev1.ConfigMap{
 					TypeMeta: metav1.TypeMeta{