integration test to reproduce faulty scenario

test/integration/controller/jobs/pytorchjob/pytorchjob_controller_test.go

@@ -609,3 +609,95 @@ var _ = ginkgo.Describe("Job controller interacting with scheduler", ginkgo.Orde
 		})
 	})
 })
+
+var _ = ginkgo.Describe("Gang Scheduling gets partial admission", ginkgo.Ordered, ginkgo.ContinueOnFailure, func() {
+	var (
+		ns            *corev1.Namespace
+		clusterQueue  *kueue.ClusterQueue
+		localQueue    *kueue.LocalQueue
+		defaultFlavor *kueue.ResourceFlavor
+	)
+
+	ginkgo.BeforeAll(func() {
+		fwk = &framework.Framework{
+			CRDPath:     crdPath,
+			DepCRDPaths: []string{pytorchCrdPath},
+		}
+		cfg := fwk.Init()
+		ctx, k8sClient = fwk.RunManager(cfg, managerAndSchedulerSetup())
+	})
+	ginkgo.AfterAll(func() {
+		fwk.Teardown()
+	})
+
+	ginkgo.BeforeEach(func() {
+		ns = &corev1.Namespace{
+			ObjectMeta: metav1.ObjectMeta{
+				GenerateName: "core-",
+			},
+		}
+		gomega.Expect(k8sClient.Create(ctx, ns)).To(gomega.Succeed())
+
+		// Give cluster queue enough resources except for GPU
+		defaultFlavor = testing.MakeResourceFlavor("default").NodeLabel(instanceKey, "default").Obj()
+		gomega.Expect(k8sClient.Create(ctx, defaultFlavor)).Should(gomega.Succeed())
+		clusterQueue = testing.MakeClusterQueue("dev-clusterqueue").
+			ResourceGroup(
+				*testing.MakeFlavorQuotas("default").
+					Resource(corev1.ResourceCPU, "134").
+					Resource(corev1.ResourceMemory, "2074").
+					Resource("example.com/gpu", "8").
+					Obj(),
+			).Obj()
+		gomega.Expect(k8sClient.Create(ctx, clusterQueue)).Should(gomega.Succeed())
+	})
+
+	ginkgo.AfterEach(func() {
+		gomega.Expect(util.DeleteNamespace(ctx, k8sClient, ns)).To(gomega.Succeed())
+		util.ExpectObjectToBeDeleted(ctx, k8sClient, clusterQueue, true)
+		util.ExpectObjectToBeDeleted(ctx, k8sClient, defaultFlavor, true)
+	})
+
+	ginkgo.It("Should schedule jobs as they fit in their ClusterQueue", func() {
+		ginkgo.By("creating localQueue")
+		localQueue = testing.MakeLocalQueue("local-queue", ns.Name).ClusterQueue(clusterQueue.Name).Obj()
+		gomega.Expect(k8sClient.Create(ctx, localQueue)).Should(gomega.Succeed())
+
+		// A job that exceeds GPU twice
+		kfJob := testingpytorchjob.MakePyTorchJob(jobName, ns.Name).
+			PyTorchReplicaSpecsDefault().
+			Queue(localQueue.Name).
+			Request(kftraining.PyTorchJobReplicaTypeMaster, corev1.ResourceCPU, "86").
+			Request(kftraining.PyTorchJobReplicaTypeWorker, corev1.ResourceCPU, "86").
+			Request(kftraining.PyTorchJobReplicaTypeMaster, corev1.ResourceMemory, "1037").
+			Request(kftraining.PyTorchJobReplicaTypeWorker, corev1.ResourceMemory, "1037").
+			Request(kftraining.PyTorchJobReplicaTypeMaster, "exampe.com/gpu", "8").
+			Request(kftraining.PyTorchJobReplicaTypeWorker, "exampe.com/gpu", "8").
+			Obj()
+
+		ginkgo.By("creating the job", func() {
+			gomega.Expect(k8sClient.Create(ctx, kfJob)).Should(gomega.Succeed())
+		})
+
+		jobLookupKey := &types.NamespacedName{Name: jobName, Namespace: ns.Name}
+		ginkgo.By("fetch the job and verify it is suspended", func() {
+			createdJob := &kftraining.PyTorchJob{}
+			gomega.Eventually(func() *bool {
+				gomega.Expect(k8sClient.Get(ctx, *jobLookupKey, createdJob)).Should(gomega.Succeed())
+				return createdJob.Spec.RunPolicy.Suspend
+			}, util.Timeout, util.Interval).Should(gomega.Equal(ptr.To(true)))
+		})
+
+		wlLookupKey := types.NamespacedName{Name: workloadpytorchjob.GetWorkloadNameForPyTorchJob(kfJob.Name, kfJob.UID), Namespace: ns.Name}
+		createdWorkload := util.AwaitAndVerifyCreatedWorkload(ctx, k8sClient, wlLookupKey, kfJob)
+
+		util.ExpectPendingWorkloadsMetric(clusterQueue, 0, 1)
+		util.ExpectReservingActiveWorkloadsMetric(clusterQueue, 0)
+
+		gomega.Consistently(func() bool {
+			lookupKey := types.NamespacedName{Name: createdWorkload.Name, Namespace: createdWorkload.Namespace}
+			gomega.Expect(k8sClient.Get(ctx, lookupKey, createdWorkload)).Should(gomega.Succeed())
+			return !workload.HasQuotaReservation(createdWorkload)
+		}, util.ConsistentDuration, util.Interval).Should(gomega.BeTrue())
+	})
+})