Add combined case 3 in the lazy activation policy tests

Signed-off-by: Mohammed Affan <mohammed.affan.727@gmail.com>

test/e2e/lazy_activation_policy_test.go

@@ -85,6 +85,7 @@ var _ = ginkgo.Describe("Lazy activation policy testing", func() {
 
 			ginkgo.DeferCleanup(func() {
 				framework.RemovePropagationPolicyIfExist(karmadaClient, namespace, policyName)
+				framework.RemovePropagationPolicyIfExist(karmadaClient, namespace, policyHigherPriorityName)
 				framework.RemoveDeployment(kubeClient, namespace, deploymentName)
 				framework.WaitDeploymentDisappearOnCluster(originalCluster, namespace, deploymentName)
 				framework.WaitDeploymentDisappearOnCluster(modifiedCluster, namespace, deploymentName)
@@ -192,6 +193,21 @@ var _ = ginkgo.Describe("Lazy activation policy testing", func() {
 			})
 		})
 
+		// Combined Case 3 (Policy preemption)
+		// refer: https://github.com/karmada-io/karmada/blob/release-1.9/docs/proposals/scheduling/activation-preference/lazy-activation-preference.md#combined-case-3-policy-preemption
+
+		ginkgo.It("Combined Case 3 (Policy preemption)", func() {
+			ginkgo.By("step 1: deployment propagate success when policy created before it", func() {
+				waitDeploymentPresentOnCluster(originalCluster, namespace, deploymentName)
+			})
+
+			ginkgo.By("step 2: create PP2 (match nginx, cluster=member2, lazy, priority=2, preemption=true)", func() {
+				policyHigherPriority.Spec.ActivationPreference = ""
+				framework.CreatePropagationPolicy(karmadaClient, policyHigherPriority)
+				waitDeploymentPresentOnCluster(modifiedCluster, namespace, deploymentName)
+			})
+		})
+
 		ginkgo.Context("Propagate dependencies", func() {
 			ginkgo.BeforeEach(func() {
 				policy.Spec.PropagateDeps = true