Fix compatibility tests for scheduler

hack/.golint_failures

@@ -406,7 +406,7 @@ pkg/volume/azure_file
 pkg/volume/cephfs
 pkg/volume/configmap
 pkg/volume/csi/fake
-pkg/volume/csi/labelmanager
+pkg/volume/csi/nodeupdater
 pkg/volume/empty_dir
 pkg/volume/fc
 pkg/volume/flexvolume

pkg/scheduler/algorithm/predicates/BUILD

@@ -47,6 +47,7 @@ go_library(
 go_test(
     name = "go_default_test",
     srcs = [
+        "csi_volume_predicate_test.go",
         "max_attachable_volume_predicate_test.go",
         "metadata_test.go",
         "predicates_test.go",

pkg/scheduler/algorithm/predicates/csi_volume_predicate.go

@@ -114,41 +114,44 @@ func (c *CSIMaxVolumeLimitChecker) filterAttachableVolumes(
 
 	for _, vol := range volumes {
 		// CSI volumes can only be used as persistent volumes
-		if vol.PersistentVolumeClaim != nil {
-			pvcName := vol.PersistentVolumeClaim.ClaimName
+		if vol.PersistentVolumeClaim == nil {
+			continue
+		}
+		pvcName := vol.PersistentVolumeClaim.ClaimName
 
-			if pvcName == "" {
-				return fmt.Errorf("PersistentVolumeClaim had no name")
-			}
+		if pvcName == "" {
+			return fmt.Errorf("PersistentVolumeClaim had no name")
+		}
 
-			pvc, err := c.pvcInfo.GetPersistentVolumeClaimInfo(namespace, pvcName)
+		pvc, err := c.pvcInfo.GetPersistentVolumeClaimInfo(namespace, pvcName)
 
-			if err != nil {
-				glog.Errorf("Unable to look up PVC info for %s/%s", namespace, pvcName)
-				continue
-			}
+		if err != nil {
+			glog.V(4).Infof("Unable to look up PVC info for %s/%s", namespace, pvcName)
+			continue
+		}
 
-			pvName := pvc.Spec.VolumeName
-			if pvName == "" {
-				glog.Errorf("Persistent volume had no name for claim %s/%s", namespace, pvcName)
-				continue
-			}
-			pv, err := c.pvInfo.GetPersistentVolumeInfo(pvName)
+		pvName := pvc.Spec.VolumeName
+		// TODO - the actual handling of unbound PVCs will be fixed by late binding design.
+		if pvName == "" {
+			glog.V(4).Infof("Persistent volume had no name for claim %s/%s", namespace, pvcName)
+			continue
+		}
+		pv, err := c.pvInfo.GetPersistentVolumeInfo(pvName)
 
-			if err != nil {
-				glog.Errorf("Unable to look up PV info for PVC %s/%s and PV %s", namespace, pvcName, pvName)
-				continue
-			}
+		if err != nil {
+			glog.V(4).Infof("Unable to look up PV info for PVC %s/%s and PV %s", namespace, pvcName, pvName)
+			continue
+		}
 
-			csiSource := pv.Spec.PersistentVolumeSource.CSI
-			if csiSource == nil {
-				glog.V(4).Infof("Not considering non-CSI volume %s/%s", namespace, pvcName)
-				continue
-			}
-			driverName := csiSource.Driver
-			volumeLimitKey := volumeutil.GetCSIAttachLimitKey(driverName)
-			result[csiSource.VolumeHandle] = volumeLimitKey
+		csiSource := pv.Spec.PersistentVolumeSource.CSI
+		if csiSource == nil {
+			glog.V(4).Infof("Not considering non-CSI volume %s/%s", namespace, pvcName)
+			continue
 		}
+		driverName := csiSource.Driver
+		volumeLimitKey := volumeutil.GetCSIAttachLimitKey(driverName)
+		result[csiSource.VolumeHandle] = volumeLimitKey
+
 	}
 	return nil
 }

pkg/scheduler/algorithm/predicates/csi_volume_predicate_test.go

+/*
+Copyright 2018 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package predicates
+
+import (
+	"reflect"
+	"testing"
+
+	"k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	utilfeature "k8s.io/apiserver/pkg/util/feature"
+	utilfeaturetesting "k8s.io/apiserver/pkg/util/feature/testing"
+	"k8s.io/kubernetes/pkg/features"
+	"k8s.io/kubernetes/pkg/scheduler/algorithm"
+)
+
+func TestCSIVolumeCountPredicate(t *testing.T) {
+	// for pods with CSI pvcs
+	oneVolPod := &v1.Pod{
+		Spec: v1.PodSpec{
+			Volumes: []v1.Volume{
+				{
+					VolumeSource: v1.VolumeSource{
+						PersistentVolumeClaim: &v1.PersistentVolumeClaimVolumeSource{
+							ClaimName: "csi-ebs",
+						},
+					},
+				},
+			},
+		},
+	}
+	twoVolPod := &v1.Pod{
+		Spec: v1.PodSpec{
+			Volumes: []v1.Volume{
+				{
+					VolumeSource: v1.VolumeSource{
+						PersistentVolumeClaim: &v1.PersistentVolumeClaimVolumeSource{
+							ClaimName: "cs-ebs-1",
+						},
+					},
+				},
+				{
+					VolumeSource: v1.VolumeSource{
+						PersistentVolumeClaim: &v1.PersistentVolumeClaimVolumeSource{
+							ClaimName: "csi-ebs-2",
+						},
+					},
+				},
+			},
+		},
+	}
+
+	runningPod := &v1.Pod{
+		Spec: v1.PodSpec{
+			Volumes: []v1.Volume{
+				{
+					VolumeSource: v1.VolumeSource{
+						PersistentVolumeClaim: &v1.PersistentVolumeClaimVolumeSource{
+							ClaimName: "csi-ebs-3",
+						},
+					},
+				},
+			},
+		},
+	}
+
+	tests := []struct {
+		newPod       *v1.Pod
+		existingPods []*v1.Pod
+		filterName   string
+		maxVols      int
+		fits         bool
+		test         string
+	}{
+		{
+			newPod:       oneVolPod,
+			existingPods: []*v1.Pod{runningPod, twoVolPod},
+			filterName:   "csi-ebs",
+			maxVols:      4,
+			fits:         true,
+			test:         "fits when node capacity >= new pods CSI volume",
+		},
+		{
+			newPod:       oneVolPod,
+			existingPods: []*v1.Pod{runningPod, twoVolPod},
+			filterName:   "csi-ebs",
+			maxVols:      2,
+			fits:         false,
+			test:         "doesn't when node capacity <= pods CSI volume",
+		},
+	}
+
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.AttachVolumeLimit, true)()
+	expectedFailureReasons := []algorithm.PredicateFailureReason{ErrMaxVolumeCountExceeded}
+	// running attachable predicate tests with feature gate and limit present on nodes
+	for _, test := range tests {
+		node := getNodeWithPodAndVolumeLimits(test.existingPods, int64(test.maxVols), test.filterName)
+		pred := NewCSIMaxVolumeLimitPredicate(getFakeCSIPVInfo("csi-ebs", "csi-ebs"), getFakeCSIPVCInfo("csi-ebs"))
+		fits, reasons, err := pred(test.newPod, PredicateMetadata(test.newPod, nil), node)
+		if err != nil {
+			t.Errorf("Using allocatable [%s]%s: unexpected error: %v", test.filterName, test.test, err)
+		}
+		if !fits && !reflect.DeepEqual(reasons, expectedFailureReasons) {
+			t.Errorf("Using allocatable [%s]%s: unexpected failure reasons: %v, want: %v", test.filterName, test.test, reasons, expectedFailureReasons)
+		}
+		if fits != test.fits {
+			t.Errorf("Using allocatable [%s]%s: expected %v, got %v", test.filterName, test.test, test.fits, fits)
+		}
+	}
+}
+
+func getFakeCSIPVInfo(volumeName, driverName string) FakePersistentVolumeInfo {
+	return FakePersistentVolumeInfo{
+		{
+			ObjectMeta: metav1.ObjectMeta{Name: volumeName},
+			Spec: v1.PersistentVolumeSpec{
+				PersistentVolumeSource: v1.PersistentVolumeSource{
+					CSI: &v1.CSIPersistentVolumeSource{
+						Driver:       driverName,
+						VolumeHandle: volumeName,
+					},
+				},
+			},
+		},
+		{
+			ObjectMeta: metav1.ObjectMeta{Name: volumeName + "-2"},
+			Spec: v1.PersistentVolumeSpec{
+				PersistentVolumeSource: v1.PersistentVolumeSource{
+					CSI: &v1.CSIPersistentVolumeSource{
+						Driver:       driverName,
+						VolumeHandle: volumeName + "-2",
+					},
+				},
+			},
+		},
+		{
+			ObjectMeta: metav1.ObjectMeta{Name: volumeName + "-3"},
+			Spec: v1.PersistentVolumeSpec{
+				PersistentVolumeSource: v1.PersistentVolumeSource{
+					CSI: &v1.CSIPersistentVolumeSource{
+						Driver:       driverName,
+						VolumeHandle: volumeName + "-3",
+					},
+				},
+			},
+		},
+	}
+}
+
+func getFakeCSIPVCInfo(volumeName string) FakePersistentVolumeClaimInfo {
+	return FakePersistentVolumeClaimInfo{
+		{
+			ObjectMeta: metav1.ObjectMeta{Name: volumeName},
+			Spec:       v1.PersistentVolumeClaimSpec{VolumeName: volumeName},
+		},
+		{
+			ObjectMeta: metav1.ObjectMeta{Name: volumeName + "-2"},
+			Spec:       v1.PersistentVolumeClaimSpec{VolumeName: volumeName + "-2"},
+		},
+		{
+			ObjectMeta: metav1.ObjectMeta{Name: volumeName + "-3"},
+			Spec:       v1.PersistentVolumeClaimSpec{VolumeName: volumeName + "-3"},
+		},
+	}
+}

pkg/scheduler/algorithm/predicates/max_attachable_volume_predicate_test.go

@@ -742,60 +742,12 @@ func TestVolumeCountConflicts(t *testing.T) {
 		},
 	}
 
-	pvInfo := func(filterName string) FakePersistentVolumeInfo {
-		return FakePersistentVolumeInfo{
-			{
-				ObjectMeta: metav1.ObjectMeta{Name: "some" + filterName + "Vol"},
-				Spec: v1.PersistentVolumeSpec{
-					PersistentVolumeSource: v1.PersistentVolumeSource{
-						AWSElasticBlockStore: &v1.AWSElasticBlockStoreVolumeSource{VolumeID: strings.ToLower(filterName) + "Vol"},
-					},
-				},
-			},
-			{
-				ObjectMeta: metav1.ObjectMeta{Name: "someNon" + filterName + "Vol"},
-				Spec: v1.PersistentVolumeSpec{
-					PersistentVolumeSource: v1.PersistentVolumeSource{},
-				},
-			},
-		}
-	}
-
-	pvcInfo := func(filterName string) FakePersistentVolumeClaimInfo {
-		return FakePersistentVolumeClaimInfo{
-			{
-				ObjectMeta: metav1.ObjectMeta{Name: "some" + filterName + "Vol"},
-				Spec:       v1.PersistentVolumeClaimSpec{VolumeName: "some" + filterName + "Vol"},
-			},
-			{
-				ObjectMeta: metav1.ObjectMeta{Name: "someNon" + filterName + "Vol"},
-				Spec:       v1.PersistentVolumeClaimSpec{VolumeName: "someNon" + filterName + "Vol"},
-			},
-			{
-				ObjectMeta: metav1.ObjectMeta{Name: "pvcWithDeletedPV"},
-				Spec:       v1.PersistentVolumeClaimSpec{VolumeName: "pvcWithDeletedPV"},
-			},
-			{
-				ObjectMeta: metav1.ObjectMeta{Name: "anotherPVCWithDeletedPV"},
-				Spec:       v1.PersistentVolumeClaimSpec{VolumeName: "anotherPVCWithDeletedPV"},
-			},
-			{
-				ObjectMeta: metav1.ObjectMeta{Name: "unboundPVC"},
-				Spec:       v1.PersistentVolumeClaimSpec{VolumeName: ""},
-			},
-			{
-				ObjectMeta: metav1.ObjectMeta{Name: "anotherUnboundPVC"},
-				Spec:       v1.PersistentVolumeClaimSpec{VolumeName: ""},
-			},
-		}
-	}
-
 	expectedFailureReasons := []algorithm.PredicateFailureReason{ErrMaxVolumeCountExceeded}
 
 	// running attachable predicate tests without feature gate and no limit present on nodes
 	for _, test := range tests {
 		os.Setenv(KubeMaxPDVols, strconv.Itoa(test.maxVols))
-		pred := NewMaxPDVolumeCountPredicate(test.filterName, pvInfo(test.filterName), pvcInfo(test.filterName))
+		pred := NewMaxPDVolumeCountPredicate(test.filterName, getFakePVInfo(test.filterName), getFakePVCInfo(test.filterName))
 		fits, reasons, err := pred(test.newPod, PredicateMetadata(test.newPod, nil), schedulercache.NewNodeInfo(test.existingPods...))
 		if err != nil {
 			t.Errorf("[%s]%s: unexpected error: %v", test.filterName, test.test, err)
@@ -813,7 +765,7 @@ func TestVolumeCountConflicts(t *testing.T) {
 	// running attachable predicate tests with feature gate and limit present on nodes
 	for _, test := range tests {
 		node := getNodeWithPodAndVolumeLimits(test.existingPods, int64(test.maxVols), test.filterName)
-		pred := NewMaxPDVolumeCountPredicate(test.filterName, pvInfo(test.filterName), pvcInfo(test.filterName))
+		pred := NewMaxPDVolumeCountPredicate(test.filterName, getFakePVInfo(test.filterName), getFakePVCInfo(test.filterName))
 		fits, reasons, err := pred(test.newPod, PredicateMetadata(test.newPod, nil), node)
 		if err != nil {
 			t.Errorf("Using allocatable [%s]%s: unexpected error: %v", test.filterName, test.test, err)
@@ -827,6 +779,54 @@ func TestVolumeCountConflicts(t *testing.T) {
 	}
 }
 
+func getFakePVInfo(filterName string) FakePersistentVolumeInfo {
+	return FakePersistentVolumeInfo{
+		{
+			ObjectMeta: metav1.ObjectMeta{Name: "some" + filterName + "Vol"},
+			Spec: v1.PersistentVolumeSpec{
+				PersistentVolumeSource: v1.PersistentVolumeSource{
+					AWSElasticBlockStore: &v1.AWSElasticBlockStoreVolumeSource{VolumeID: strings.ToLower(filterName) + "Vol"},
+				},
+			},
+		},
+		{
+			ObjectMeta: metav1.ObjectMeta{Name: "someNon" + filterName + "Vol"},
+			Spec: v1.PersistentVolumeSpec{
+				PersistentVolumeSource: v1.PersistentVolumeSource{},
+			},
+		},
+	}
+}
+
+func getFakePVCInfo(filterName string) FakePersistentVolumeClaimInfo {
+	return FakePersistentVolumeClaimInfo{
+		{
+			ObjectMeta: metav1.ObjectMeta{Name: "some" + filterName + "Vol"},
+			Spec:       v1.PersistentVolumeClaimSpec{VolumeName: "some" + filterName + "Vol"},
+		},
+		{
+			ObjectMeta: metav1.ObjectMeta{Name: "someNon" + filterName + "Vol"},
+			Spec:       v1.PersistentVolumeClaimSpec{VolumeName: "someNon" + filterName + "Vol"},
+		},
+		{
+			ObjectMeta: metav1.ObjectMeta{Name: "pvcWithDeletedPV"},
+			Spec:       v1.PersistentVolumeClaimSpec{VolumeName: "pvcWithDeletedPV"},
+		},
+		{
+			ObjectMeta: metav1.ObjectMeta{Name: "anotherPVCWithDeletedPV"},
+			Spec:       v1.PersistentVolumeClaimSpec{VolumeName: "anotherPVCWithDeletedPV"},
+		},
+		{
+			ObjectMeta: metav1.ObjectMeta{Name: "unboundPVC"},
+			Spec:       v1.PersistentVolumeClaimSpec{VolumeName: ""},
+		},
+		{
+			ObjectMeta: metav1.ObjectMeta{Name: "anotherUnboundPVC"},
+			Spec:       v1.PersistentVolumeClaimSpec{VolumeName: ""},
+		},
+	}
+}
+
 func TestMaxVolumeFunc(t *testing.T) {
 	node := &v1.Node{
 		ObjectMeta: metav1.ObjectMeta{
@@ -867,6 +867,6 @@ func getVolumeLimitKey(filterType string) v1.ResourceName {
 	case AzureDiskVolumeFilterType:
 		return v1.ResourceName(volumeutil.AzureVolumeLimitKey)
 	default:
-		return ""
+		return v1.ResourceName(volumeutil.GetCSIAttachLimitKey(filterType))
 	}
 }

pkg/scheduler/algorithmprovider/defaults/compatibility_test.go

@@ -814,6 +814,130 @@ func TestCompatibility_v1_Scheduler(t *testing.T) {
 				}},
 			},
 		},
+		// Do not change this JSON after the corresponding release has been tagged.
+		// A failure indicates backwards compatibility with the specified release was broken.
+		"1.12": {
+			JSON: `{
+		  "kind": "Policy",
+		  "apiVersion": "v1",
+		  "predicates": [
+			{"name": "MatchNodeSelector"},
+			{"name": "PodFitsResources"},
+			{"name": "PodFitsHostPorts"},
+			{"name": "HostName"},
+			{"name": "NoDiskConflict"},
+			{"name": "NoVolumeZoneConflict"},
+			{"name": "PodToleratesNodeTaints"},
+			{"name": "CheckNodeMemoryPressure"},
+			{"name": "CheckNodeDiskPressure"},
+			{"name": "CheckNodePIDPressure"},
+			{"name": "CheckNodeCondition"},
+			{"name": "MaxEBSVolumeCount"},
+			{"name": "MaxGCEPDVolumeCount"},
+			{"name": "MaxAzureDiskVolumeCount"},
+			{"name": "MaxCSIVolumeCountPred"},
+			{"name": "MatchInterPodAffinity"},
+			{"name": "GeneralPredicates"},
+			{"name": "CheckVolumeBinding"},
+			{"name": "TestServiceAffinity", "argument": {"serviceAffinity" : {"labels" : ["region"]}}},
+			{"name": "TestLabelsPresence",  "argument": {"labelsPresence"  : {"labels" : ["foo"], "presence":true}}}
+		  ],"priorities": [
+			{"name": "EqualPriority",   "weight": 2},
+			{"name": "ImageLocalityPriority",   "weight": 2},
+			{"name": "LeastRequestedPriority",   "weight": 2},
+			{"name": "BalancedResourceAllocation",   "weight": 2},
+			{"name": "SelectorSpreadPriority",   "weight": 2},
+			{"name": "NodePreferAvoidPodsPriority",   "weight": 2},
+			{"name": "NodeAffinityPriority",   "weight": 2},
+			{"name": "TaintTolerationPriority",   "weight": 2},
+			{"name": "InterPodAffinityPriority",   "weight": 2},
+			{"name": "MostRequestedPriority",   "weight": 2},
+			{
+				"name": "RequestedToCapacityRatioPriority",
+				"weight": 2,
+				"argument": {
+				"requestedToCapacityRatioArguments": {
+					"shape": [
+						{"utilization": 0,  "score": 0},
+						{"utilization": 50, "score": 7}
+					]
+				}
+			}}
+		  ],"extenders": [{
+			"urlPrefix":        "/prefix",
+			"filterVerb":       "filter",
+			"prioritizeVerb":   "prioritize",
+			"weight":           1,
+			"bindVerb":         "bind",
+			"enableHttps":      true,
+			"tlsConfig":        {"Insecure":true},
+			"httpTimeout":      1,
+			"nodeCacheCapable": true,
+			"managedResources": [{"name":"example.com/foo","ignoredByScheduler":true}],
+			"ignorable":true
+		  }]
+		}`,
+			ExpectedPolicy: schedulerapi.Policy{
+				Predicates: []schedulerapi.PredicatePolicy{
+					{Name: "MatchNodeSelector"},
+					{Name: "PodFitsResources"},
+					{Name: "PodFitsHostPorts"},
+					{Name: "HostName"},
+					{Name: "NoDiskConflict"},
+					{Name: "NoVolumeZoneConflict"},
+					{Name: "PodToleratesNodeTaints"},
+					{Name: "CheckNodeMemoryPressure"},
+					{Name: "CheckNodeDiskPressure"},
+					{Name: "CheckNodePIDPressure"},
+					{Name: "CheckNodeCondition"},
+					{Name: "MaxEBSVolumeCount"},
+					{Name: "MaxGCEPDVolumeCount"},
+					{Name: "MaxAzureDiskVolumeCount"},
+					{Name: "MaxCSIVolumeCountPred"},
+					{Name: "MatchInterPodAffinity"},
+					{Name: "GeneralPredicates"},
+					{Name: "CheckVolumeBinding"},
+					{Name: "TestServiceAffinity", Argument: &schedulerapi.PredicateArgument{ServiceAffinity: &schedulerapi.ServiceAffinity{Labels: []string{"region"}}}},
+					{Name: "TestLabelsPresence", Argument: &schedulerapi.PredicateArgument{LabelsPresence: &schedulerapi.LabelsPresence{Labels: []string{"foo"}, Presence: true}}},
+				},
+				Priorities: []schedulerapi.PriorityPolicy{
+					{Name: "EqualPriority", Weight: 2},
+					{Name: "ImageLocalityPriority", Weight: 2},
+					{Name: "LeastRequestedPriority", Weight: 2},
+					{Name: "BalancedResourceAllocation", Weight: 2},
+					{Name: "SelectorSpreadPriority", Weight: 2},
+					{Name: "NodePreferAvoidPodsPriority", Weight: 2},
+					{Name: "NodeAffinityPriority", Weight: 2},
+					{Name: "TaintTolerationPriority", Weight: 2},
+					{Name: "InterPodAffinityPriority", Weight: 2},
+					{Name: "MostRequestedPriority", Weight: 2},
+					{
+						Name:   "RequestedToCapacityRatioPriority",
+						Weight: 2,
+						Argument: &schedulerapi.PriorityArgument{
+							RequestedToCapacityRatioArguments: &schedulerapi.RequestedToCapacityRatioArguments{
+								UtilizationShape: []schedulerapi.UtilizationShapePoint{
+									{Utilization: 0, Score: 0},
+									{Utilization: 50, Score: 7},
+								}},
+						},
+					},
+				},
+				ExtenderConfigs: []schedulerapi.ExtenderConfig{{
+					URLPrefix:        "/prefix",
+					FilterVerb:       "filter",
+					PrioritizeVerb:   "prioritize",
+					Weight:           1,
+					BindVerb:         "bind", // 1.11 restored case-sensitivity, but allowed either "BindVerb" or "bindVerb"
+					EnableHTTPS:      true,
+					TLSConfig:        &restclient.TLSClientConfig{Insecure: true},
+					HTTPTimeout:      1,
+					NodeCacheCapable: true,
+					ManagedResources: []schedulerapi.ExtenderManagedResource{{Name: v1.ResourceName("example.com/foo"), IgnoredByScheduler: true}},
+					Ignorable:        true,
+				}},
+			},
+		},
 	}
 
 	registeredPredicates := sets.NewString(factory.ListRegisteredFitPredicates()...)

pkg/volume/util/attach_limit_test.go

@@ -17,7 +17,8 @@ limitations under the License.
 package util
 
 import (
-	"fmt"
+	"crypto/sha1"
+	"encoding/hex"
 	"testing"
 
 	"k8s.io/api/core/v1"
@@ -32,9 +33,23 @@ func TestGetCSIAttachLimitKey(t *testing.T) {
 	}
 
 	// When driver is longer than 39 chars
-	csiLimitKeyLonger := GetCSIAttachLimitKey("com.amazon.kubernetes.eks.ec2.ebs/csi-driver")
-	fmt.Println(csiLimitKeyLonger)
+	longDriverName := "com.amazon.kubernetes.eks.ec2.ebs/csi-driver"
+	csiLimitKeyLonger := GetCSIAttachLimitKey(longDriverName)
 	if !v1helper.IsAttachableVolumeResourceName(v1.ResourceName(csiLimitKeyLonger)) {
 		t.Errorf("Expected %s to have attachable prefix", csiLimitKeyLonger)
 	}
+
+	expectedCSIKey := getDriverHash(longDriverName)
+	if csiLimitKeyLonger != expectedCSIKey {
+		t.Errorf("Expected limit to be %s got %s", expectedCSIKey, csiLimitKeyLonger)
+	}
+}
+
+func getDriverHash(driverName string) string {
+	charsFromDriverName := driverName[:23]
+	hash := sha1.New()
+	hash.Write([]byte(driverName))
+	hashed := hex.EncodeToString(hash.Sum(nil))
+	hashed = hashed[:16]
+	return CSIAttachLimitPrefix + charsFromDriverName + hashed
 }