Fixup incorrect use of DefaultFeatureGate.Set in tests

pkg/api/podsecuritypolicy/util_test.go

@@ -20,6 +20,7 @@ import (
 	"testing"
 
 	utilfeature "k8s.io/apiserver/pkg/util/feature"
+	utilfeaturetesting "k8s.io/apiserver/pkg/util/feature/testing"
 	api "k8s.io/kubernetes/pkg/apis/core"
 	"k8s.io/kubernetes/pkg/apis/policy"
 	"k8s.io/kubernetes/pkg/features"
@@ -34,10 +35,7 @@ func TestDropAlphaProcMountType(t *testing.T) {
 	}
 
 	// Enable alpha feature ProcMountType
-	err1 := utilfeature.DefaultFeatureGate.Set("ProcMountType=true")
-	if err1 != nil {
-		t.Fatalf("Failed to enable feature gate for ProcMountType: %v", err1)
-	}
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.ProcMountType, true)()
 
 	// now test dropping the fields - should not be dropped
 	DropDisabledAlphaFields(&psp.Spec)
@@ -51,10 +49,7 @@ func TestDropAlphaProcMountType(t *testing.T) {
 	}
 
 	// Disable alpha feature ProcMountType
-	err := utilfeature.DefaultFeatureGate.Set("ProcMountType=false")
-	if err != nil {
-		t.Fatalf("Failed to disable feature gate for ProcMountType: %v", err)
-	}
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.ProcMountType, false)()
 
 	// now test dropping the fields
 	DropDisabledAlphaFields(&psp.Spec)

pkg/apis/batch/validation/validation_test.go

@@ -24,6 +24,7 @@ import (
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/types"
 	utilfeature "k8s.io/apiserver/pkg/util/feature"
+	utilfeaturetesting "k8s.io/apiserver/pkg/util/feature/testing"
 	"k8s.io/kubernetes/pkg/apis/batch"
 	api "k8s.io/kubernetes/pkg/apis/core"
 	"k8s.io/kubernetes/pkg/features"
@@ -74,14 +75,6 @@ func featureToggle(feature utilfeature.Feature) []string {
 }
 
 func TestValidateJob(t *testing.T) {
-	ttlEnabled := utilfeature.DefaultFeatureGate.Enabled(features.TTLAfterFinished)
-	defer func() {
-		err := utilfeature.DefaultFeatureGate.Set(fmt.Sprintf("%s=%t", features.TTLAfterFinished, ttlEnabled))
-		if err != nil {
-			t.Fatalf("Failed to set feature gate for %s: %v", features.TTLAfterFinished, err)
-		}
-	}()
-
 	validManualSelector := getValidManualSelector()
 	validPodTemplateSpecForManual := getValidPodTemplateSpecForManual(validManualSelector)
 	validGeneratedSelector := getValidGeneratedSelector()
@@ -231,11 +224,8 @@ func TestValidateJob(t *testing.T) {
 		},
 	}
 
-	for _, setFeature := range featureToggle(features.TTLAfterFinished) {
-		// Set error cases based on if TTLAfterFinished feature is enabled or not
-		if err := utilfeature.DefaultFeatureGate.Set(setFeature); err != nil {
-			t.Fatalf("Failed to set feature gate for %s: %v", features.TTLAfterFinished, err)
-		}
+	for _, setFeature := range []bool{true, false} {
+		defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.TTLAfterFinished, setFeature)()
 		ttlCase := "spec.ttlSecondsAfterFinished:must be greater than or equal to 0"
 		if utilfeature.DefaultFeatureGate.Enabled(features.TTLAfterFinished) {
 			errorCases[ttlCase] = batch.Job{

pkg/apis/core/validation/validation_test.go

@@ -18,7 +18,6 @@ package validation
 
 import (
 	"bytes"
-	"fmt"
 	"math"
 	"reflect"
 	"strings"
@@ -784,11 +783,7 @@ func TestAlphaVolumeSnapshotDataSource(t *testing.T) {
 	}
 
 	// Enable alpha feature VolumeSnapshotDataSource
-	err := utilfeature.DefaultFeatureGate.Set("VolumeSnapshotDataSource=true")
-	if err != nil {
-		t.Errorf("Failed to enable feature gate for VolumeSnapshotDataSource: %v", err)
-		return
-	}
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.VolumeSnapshotDataSource, true)()
 	for _, tc := range successTestCases {
 		if errs := ValidatePersistentVolumeClaimSpec(&tc, field.NewPath("spec")); len(errs) != 0 {
 			t.Errorf("expected success: %v", errs)
@@ -800,11 +795,7 @@ func TestAlphaVolumeSnapshotDataSource(t *testing.T) {
 		}
 	}
 	// Disable alpha feature VolumeSnapshotDataSource
-	err = utilfeature.DefaultFeatureGate.Set("VolumeSnapshotDataSource=false")
-	if err != nil {
-		t.Errorf("Failed to disable feature gate for VolumeSnapshotDataSource: %v", err)
-		return
-	}
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.VolumeSnapshotDataSource, false)()
 	for _, tc := range successTestCases {
 		if errs := ValidatePersistentVolumeClaimSpec(&tc, field.NewPath("spec")); len(errs) == 0 {
 			t.Errorf("expected failure: %v", errs)
@@ -4897,8 +4888,7 @@ func TestValidateVolumeMounts(t *testing.T) {
 }
 
 func TestValidateDisabledSubpath(t *testing.T) {
-	utilfeature.DefaultFeatureGate.Set("VolumeSubpath=false")
-	defer utilfeature.DefaultFeatureGate.Set("VolumeSubpath=true")
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.VolumeSubpath, false)()
 
 	volumes := []core.Volume{
 		{Name: "abc", VolumeSource: core.VolumeSource{PersistentVolumeClaim: &core.PersistentVolumeClaimVolumeSource{ClaimName: "testclaim1"}}},
@@ -5734,16 +5724,7 @@ func TestValidateRestartPolicy(t *testing.T) {
 }
 
 func TestValidateDNSPolicy(t *testing.T) {
-	customDNSEnabled := utilfeature.DefaultFeatureGate.Enabled("CustomPodDNS")
-	defer func() {
-		// Restoring the old value.
-		if err := utilfeature.DefaultFeatureGate.Set(fmt.Sprintf("CustomPodDNS=%v", customDNSEnabled)); err != nil {
-			t.Errorf("Failed to restore CustomPodDNS feature gate: %v", err)
-		}
-	}()
-	if err := utilfeature.DefaultFeatureGate.Set("CustomPodDNS=true"); err != nil {
-		t.Errorf("Failed to enable CustomPodDNS feature gate: %v", err)
-	}
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.CustomPodDNS, true)()
 
 	successCases := []core.DNSPolicy{core.DNSClusterFirst, core.DNSDefault, core.DNSPolicy(core.DNSClusterFirst), core.DNSNone}
 	for _, policy := range successCases {
@@ -5761,16 +5742,7 @@ func TestValidateDNSPolicy(t *testing.T) {
 }
 
 func TestValidatePodDNSConfig(t *testing.T) {
-	customDNSEnabled := utilfeature.DefaultFeatureGate.Enabled("CustomPodDNS")
-	defer func() {
-		// Restoring the old value.
-		if err := utilfeature.DefaultFeatureGate.Set(fmt.Sprintf("CustomPodDNS=%v", customDNSEnabled)); err != nil {
-			t.Errorf("Failed to restore CustomPodDNS feature gate: %v", err)
-		}
-	}()
-	if err := utilfeature.DefaultFeatureGate.Set("CustomPodDNS=true"); err != nil {
-		t.Errorf("Failed to enable CustomPodDNS feature gate: %v", err)
-	}
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.CustomPodDNS, true)()
 
 	generateTestSearchPathFunc := func(numChars int) string {
 		res := ""
@@ -5932,16 +5904,7 @@ func TestValidatePodDNSConfig(t *testing.T) {
 }
 
 func TestValidatePodReadinessGates(t *testing.T) {
-	podReadinessGatesEnabled := utilfeature.DefaultFeatureGate.Enabled(features.PodReadinessGates)
-	defer func() {
-		// Restoring the old value.
-		if err := utilfeature.DefaultFeatureGate.Set(fmt.Sprintf("%s=%v", features.PodReadinessGates, podReadinessGatesEnabled)); err != nil {
-			t.Errorf("Failed to restore PodReadinessGates feature gate: %v", err)
-		}
-	}()
-	if err := utilfeature.DefaultFeatureGate.Set(fmt.Sprintf("%s=true", features.PodReadinessGates)); err != nil {
-		t.Errorf("Failed to enable PodReadinessGates feature gate: %v", err)
-	}
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.PodReadinessGates, true)()
 
 	successCases := []struct {
 		desc           string

pkg/controller/daemon/util/daemonset_util_test.go

@@ -25,6 +25,7 @@ import (
 	extensions "k8s.io/api/extensions/v1beta1"
 	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/api/testapi"
 	"k8s.io/kubernetes/pkg/features"
 	kubeletapis "k8s.io/kubernetes/pkg/kubelet/apis"
@@ -482,17 +483,12 @@ func TestReplaceDaemonSetPodNodeNameNodeAffinity(t *testing.T) {
 
 func forEachFeatureGate(t *testing.T, tf func(t *testing.T), gates ...utilfeature.Feature) {
 	for _, fg := range gates {
-		func() {
-			enabled := utilfeature.DefaultFeatureGate.Enabled(fg)
-			defer func() {
-				utilfeature.DefaultFeatureGate.Set(fmt.Sprintf("%v=%t", fg, enabled))
-			}()
-
-			for _, f := range []bool{true, false} {
-				utilfeature.DefaultFeatureGate.Set(fmt.Sprintf("%v=%t", fg, f))
+		for _, f := range []bool{true, false} {
+			func() {
+				defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, fg, f)()
 				t.Run(fmt.Sprintf("%v (%t)", fg, f), tf)
-			}
-		}()
+			}()
+		}
 	}
 }
 

pkg/kubelet/eviction/eviction_manager_test.go

@@ -26,6 +26,7 @@ import (
 	"k8s.io/apimachinery/pkg/types"
 	"k8s.io/apimachinery/pkg/util/clock"
 	utilfeature "k8s.io/apiserver/pkg/util/feature"
+	utilfeaturetesting "k8s.io/apiserver/pkg/util/feature/testing"
 	"k8s.io/client-go/tools/record"
 	kubeapi "k8s.io/kubernetes/pkg/apis/core"
 	"k8s.io/kubernetes/pkg/features"
@@ -181,7 +182,7 @@ type podToMake struct {
 
 // TestMemoryPressure
 func TestMemoryPressure(t *testing.T) {
-	utilfeature.DefaultFeatureGate.SetFromMap(map[string]bool{string(features.PodPriority): true})
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.PodPriority, true)()
 	podMaker := makePodWithMemoryStats
 	summaryStatsMaker := makeMemoryStats
 	podsToMake := []podToMake{
@@ -399,10 +400,9 @@ func parseQuantity(value string) resource.Quantity {
 }
 
 func TestDiskPressureNodeFs(t *testing.T) {
-	utilfeature.DefaultFeatureGate.SetFromMap(map[string]bool{
-		string(features.LocalStorageCapacityIsolation): true,
-		string(features.PodPriority):                   true,
-	})
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.LocalStorageCapacityIsolation, true)()
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.PodPriority, true)()
+
 	podMaker := makePodWithDiskStats
 	summaryStatsMaker := makeDiskStats
 	podsToMake := []podToMake{
@@ -600,7 +600,7 @@ func TestDiskPressureNodeFs(t *testing.T) {
 
 // TestMinReclaim verifies that min-reclaim works as desired.
 func TestMinReclaim(t *testing.T) {
-	utilfeature.DefaultFeatureGate.SetFromMap(map[string]bool{string(features.PodPriority): true})
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.PodPriority, true)()
 	podMaker := makePodWithMemoryStats
 	summaryStatsMaker := makeMemoryStats
 	podsToMake := []podToMake{
@@ -739,10 +739,9 @@ func TestMinReclaim(t *testing.T) {
 }
 
 func TestNodeReclaimFuncs(t *testing.T) {
-	utilfeature.DefaultFeatureGate.SetFromMap(map[string]bool{
-		string(features.PodPriority):                   true,
-		string(features.LocalStorageCapacityIsolation): true,
-	})
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.LocalStorageCapacityIsolation, true)()
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.PodPriority, true)()
+
 	podMaker := makePodWithDiskStats
 	summaryStatsMaker := makeDiskStats
 	podsToMake := []podToMake{
@@ -918,7 +917,7 @@ func TestNodeReclaimFuncs(t *testing.T) {
 }
 
 func TestInodePressureNodeFsInodes(t *testing.T) {
-	utilfeature.DefaultFeatureGate.SetFromMap(map[string]bool{string(features.PodPriority): true})
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.PodPriority, true)()
 	podMaker := func(name string, priority int32, requests v1.ResourceList, limits v1.ResourceList, rootInodes, logInodes, volumeInodes string) (*v1.Pod, statsapi.PodStats) {
 		pod := newPod(name, priority, []v1.Container{
 			newContainer(name, requests, limits),
@@ -1140,7 +1139,7 @@ func TestInodePressureNodeFsInodes(t *testing.T) {
 
 // TestCriticalPodsAreNotEvicted
 func TestCriticalPodsAreNotEvicted(t *testing.T) {
-	utilfeature.DefaultFeatureGate.SetFromMap(map[string]bool{string(features.PodPriority): true})
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.PodPriority, true)()
 	podMaker := makePodWithMemoryStats
 	summaryStatsMaker := makeMemoryStats
 	podsToMake := []podToMake{
@@ -1210,7 +1209,7 @@ func TestCriticalPodsAreNotEvicted(t *testing.T) {
 	}
 
 	// Enable critical pod annotation feature gate
-	utilfeature.DefaultFeatureGate.SetFromMap(map[string]bool{string(features.ExperimentalCriticalPodAnnotation): true})
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.ExperimentalCriticalPodAnnotation, true)()
 	// induce soft threshold
 	fakeClock.Step(1 * time.Minute)
 	summaryProvider.result = summaryStatsMaker("1500Mi", podStats)
@@ -1255,7 +1254,7 @@ func TestCriticalPodsAreNotEvicted(t *testing.T) {
 	}
 
 	// Disable critical pod annotation feature gate
-	utilfeature.DefaultFeatureGate.SetFromMap(map[string]bool{string(features.ExperimentalCriticalPodAnnotation): false})
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.ExperimentalCriticalPodAnnotation, false)()
 
 	// induce memory pressure!
 	fakeClock.Step(1 * time.Minute)
@@ -1275,7 +1274,7 @@ func TestCriticalPodsAreNotEvicted(t *testing.T) {
 
 // TestAllocatableMemoryPressure
 func TestAllocatableMemoryPressure(t *testing.T) {
-	utilfeature.DefaultFeatureGate.SetFromMap(map[string]bool{string(features.PodPriority): true})
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.PodPriority, true)()
 	podMaker := makePodWithMemoryStats
 	summaryStatsMaker := makeMemoryStats
 	podsToMake := []podToMake{

pkg/kubelet/eviction/helpers_test.go

@@ -28,6 +28,7 @@ import (
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/types"
 	utilfeature "k8s.io/apiserver/pkg/util/feature"
+	utilfeaturetesting "k8s.io/apiserver/pkg/util/feature/testing"
 	"k8s.io/kubernetes/pkg/features"
 	statsapi "k8s.io/kubernetes/pkg/kubelet/apis/stats/v1alpha1"
 	evictionapi "k8s.io/kubernetes/pkg/kubelet/eviction/api"
@@ -423,7 +424,8 @@ func thresholdEqual(a evictionapi.Threshold, b evictionapi.Threshold) bool {
 }
 
 func TestOrderedByExceedsRequestMemory(t *testing.T) {
-	utilfeature.DefaultFeatureGate.Set(fmt.Sprintf("%s=true", features.PodPriority))
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.PodPriority, true)()
+
 	below := newPod("below-requests", -1, []v1.Container{
 		newContainer("below-requests", newResourceList("", "200Mi", ""), newResourceList("", "", "")),
 	}, nil)
@@ -450,8 +452,8 @@ func TestOrderedByExceedsRequestMemory(t *testing.T) {
 }
 
 func TestOrderedByExceedsRequestDisk(t *testing.T) {
-	utilfeature.DefaultFeatureGate.Set(fmt.Sprintf("%s=true", features.PodPriority))
-	utilfeature.DefaultFeatureGate.Set(fmt.Sprintf("%s=true", features.LocalStorageCapacityIsolation))
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.PodPriority, true)()
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.LocalStorageCapacityIsolation, true)()
 	below := newPod("below-requests", -1, []v1.Container{
 		newContainer("below-requests", v1.ResourceList{v1.ResourceEphemeralStorage: resource.MustParse("200Mi")}, newResourceList("", "", "")),
 	}, nil)
@@ -478,7 +480,7 @@ func TestOrderedByExceedsRequestDisk(t *testing.T) {
 }
 
 func TestOrderedByPriority(t *testing.T) {
-	utilfeature.DefaultFeatureGate.Set(fmt.Sprintf("%s=true", features.PodPriority))
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.PodPriority, true)()
 	low := newPod("low-priority", -134, []v1.Container{
 		newContainer("low-priority", newResourceList("", "", ""), newResourceList("", "", "")),
 	}, nil)
@@ -501,7 +503,7 @@ func TestOrderedByPriority(t *testing.T) {
 }
 
 func TestOrderedByPriorityDisabled(t *testing.T) {
-	utilfeature.DefaultFeatureGate.Set(fmt.Sprintf("%s=false", features.PodPriority))
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.PodPriority, false)()
 	low := newPod("low-priority", lowPriority, []v1.Container{
 		newContainer("low-priority", newResourceList("", "", ""), newResourceList("", "", "")),
 	}, nil)
@@ -525,7 +527,7 @@ func TestOrderedByPriorityDisabled(t *testing.T) {
 }
 
 func TestOrderedbyDisk(t *testing.T) {
-	utilfeature.DefaultFeatureGate.Set(fmt.Sprintf("%s=true", features.LocalStorageCapacityIsolation))
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.LocalStorageCapacityIsolation, true)()
 	pod1 := newPod("best-effort-high", defaultPriority, []v1.Container{
 		newContainer("best-effort-high", newResourceList("", "", ""), newResourceList("", "", "")),
 	}, []v1.Volume{
@@ -592,7 +594,7 @@ func TestOrderedbyDisk(t *testing.T) {
 
 // Tests that we correctly ignore disk requests when the local storage feature gate is disabled.
 func TestOrderedbyDiskDisableLocalStorage(t *testing.T) {
-	utilfeature.DefaultFeatureGate.Set(fmt.Sprintf("%s=false", features.LocalStorageCapacityIsolation))
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.LocalStorageCapacityIsolation, false)()
 	pod1 := newPod("best-effort-high", defaultPriority, []v1.Container{
 		newContainer("best-effort-high", newResourceList("", "", ""), newResourceList("", "", "")),
 	}, []v1.Volume{
@@ -658,8 +660,8 @@ func TestOrderedbyDiskDisableLocalStorage(t *testing.T) {
 }
 
 func TestOrderedbyInodes(t *testing.T) {
-	utilfeature.DefaultFeatureGate.Set(fmt.Sprintf("%s=true", features.PodPriority))
-	utilfeature.DefaultFeatureGate.Set(fmt.Sprintf("%s=true", features.LocalStorageCapacityIsolation))
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.PodPriority, true)()
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.LocalStorageCapacityIsolation, true)()
 	low := newPod("low", defaultPriority, []v1.Container{
 		newContainer("low", newResourceList("", "", ""), newResourceList("", "", "")),
 	}, []v1.Volume{
@@ -702,8 +704,8 @@ func TestOrderedbyInodes(t *testing.T) {
 
 // TestOrderedByPriorityDisk ensures we order pods by priority and then greediest resource consumer
 func TestOrderedByPriorityDisk(t *testing.T) {
-	utilfeature.DefaultFeatureGate.Set(fmt.Sprintf("%s=true", features.PodPriority))
-	utilfeature.DefaultFeatureGate.Set(fmt.Sprintf("%s=true", features.LocalStorageCapacityIsolation))
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.PodPriority, true)()
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.LocalStorageCapacityIsolation, true)()
 	pod1 := newPod("above-requests-low-priority-high-usage", lowPriority, []v1.Container{
 		newContainer("above-requests-low-priority-high-usage", newResourceList("", "", ""), newResourceList("", "", "")),
 	}, []v1.Volume{
@@ -787,7 +789,7 @@ func TestOrderedByPriorityDisk(t *testing.T) {
 
 // TestOrderedByPriorityInodes ensures we order pods by priority and then greediest resource consumer
 func TestOrderedByPriorityInodes(t *testing.T) {
-	utilfeature.DefaultFeatureGate.Set(fmt.Sprintf("%s=true", features.PodPriority))
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.PodPriority, true)()
 	pod1 := newPod("low-priority-high-usage", lowPriority, []v1.Container{
 		newContainer("low-priority-high-usage", newResourceList("", "", ""), newResourceList("", "", "")),
 	}, []v1.Volume{
@@ -880,7 +882,7 @@ func TestOrderedByMemory(t *testing.T) {
 
 // TestOrderedByPriorityMemory ensures we order by priority and then memory consumption relative to request.
 func TestOrderedByPriorityMemory(t *testing.T) {
-	utilfeature.DefaultFeatureGate.Set(fmt.Sprintf("%s=true", features.PodPriority))
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.PodPriority, true)()
 	pod1 := newPod("above-requests-low-priority-high-usage", lowPriority, []v1.Container{
 		newContainer("above-requests-low-priority-high-usage", newResourceList("", "", ""), newResourceList("", "", "")),
 	}, nil)

pkg/kubelet/kubelet_test.go

@@ -36,6 +36,7 @@ import (
 	"k8s.io/apimachinery/pkg/util/sets"
 	"k8s.io/apimachinery/pkg/util/wait"
 	utilfeature "k8s.io/apiserver/pkg/util/feature"
+	utilfeaturetesting "k8s.io/apiserver/pkg/util/feature/testing"
 	"k8s.io/client-go/kubernetes/fake"
 	"k8s.io/client-go/tools/record"
 	"k8s.io/client-go/util/flowcontrol"
@@ -2254,17 +2255,12 @@ func runVolumeManager(kubelet *Kubelet) chan struct{} {
 
 func forEachFeatureGate(t *testing.T, fs []utilfeature.Feature, tf func(t *testing.T)) {
 	for _, fg := range fs {
-		func() {
-			enabled := utilfeature.DefaultFeatureGate.Enabled(fg)
-			defer func() {
-				utilfeature.DefaultFeatureGate.Set(fmt.Sprintf("%v=%t", fg, enabled))
-			}()
-
-			for _, f := range []bool{true, false} {
-				utilfeature.DefaultFeatureGate.Set(fmt.Sprintf("%v=%t", fg, f))
+		for _, f := range []bool{true, false} {
+			func() {
+				defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, fg, f)()
 				t.Run(fmt.Sprintf("%v(%t)", fg, f), tf)
-			}
-		}()
+			}()
+		}
 	}
 }
 

pkg/kubelet/kuberuntime/labels_test.go

@@ -24,6 +24,8 @@ import (
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/util/intstr"
 	utilfeature "k8s.io/apiserver/pkg/util/feature"
+	utilfeaturetesting "k8s.io/apiserver/pkg/util/feature/testing"
+	"k8s.io/kubernetes/pkg/features"
 	kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
 )
 
@@ -67,15 +69,15 @@ func TestContainerLabels(t *testing.T) {
 
 	var tests = []struct {
 		description     string
-		featuresCreated string // Features enabled when container is created
-		featuresStatus  string // Features enabled when container status is read
+		featuresCreated bool // Features enabled when container is created
+		featuresStatus  bool // Features enabled when container status is read
 		typeLabel       kubecontainer.ContainerType
 		expected        *labeledContainerInfo
 	}{
 		{
 			"Debug containers disabled",
-			"DebugContainers=False",
-			"DebugContainers=False",
+			false,
+			false,
 			"ignored",
 			&labeledContainerInfo{
 				PodName:       pod.Name,
@@ -87,8 +89,8 @@ func TestContainerLabels(t *testing.T) {
 		},
 		{
 			"Regular containers",
-			"DebugContainers=True",
-			"DebugContainers=True",
+			true,
+			true,
 			kubecontainer.ContainerTypeRegular,
 			&labeledContainerInfo{
 				PodName:       pod.Name,
@@ -100,8 +102,8 @@ func TestContainerLabels(t *testing.T) {
 		},
 		{
 			"Init containers",
-			"DebugContainers=True",
-			"DebugContainers=True",
+			true,
+			true,
 			kubecontainer.ContainerTypeInit,
 			&labeledContainerInfo{
 				PodName:       pod.Name,
@@ -113,8 +115,8 @@ func TestContainerLabels(t *testing.T) {
 		},
 		{
 			"Created without type label",
-			"DebugContainers=False",
-			"DebugContainers=True",
+			false,
+			true,
 			"ignored",
 			&labeledContainerInfo{
 				PodName:       pod.Name,
@@ -126,8 +128,8 @@ func TestContainerLabels(t *testing.T) {
 		},
 		{
 			"Created with type label, subsequently disabled",
-			"DebugContainers=True",
-			"DebugContainers=False",
+			true,
+			false,
 			kubecontainer.ContainerTypeRegular,
 			&labeledContainerInfo{
 				PodName:       pod.Name,
@@ -141,15 +143,16 @@ func TestContainerLabels(t *testing.T) {
 
 	// Test whether we can get right information from label
 	for _, test := range tests {
-		utilfeature.DefaultFeatureGate.Set(test.featuresCreated)
-		labels := newContainerLabels(container, pod, test.typeLabel)
-		utilfeature.DefaultFeatureGate.Set(test.featuresStatus)
-		containerInfo := getContainerInfoFromLabels(labels)
-		if !reflect.DeepEqual(containerInfo, test.expected) {
-			t.Errorf("%v: expected %v, got %v", test.description, test.expected, containerInfo)
-		}
+		func() {
+			defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.DebugContainers, test.featuresCreated)()
+			labels := newContainerLabels(container, pod, test.typeLabel)
+			defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.DebugContainers, test.featuresStatus)()
+			containerInfo := getContainerInfoFromLabels(labels)
+			if !reflect.DeepEqual(containerInfo, test.expected) {
+				t.Errorf("%v: expected %v, got %v", test.description, test.expected, containerInfo)
+			}
+		}()
 	}
-	utilfeature.DefaultFeatureGate.Set("DebugContainers=False")
 }
 
 func TestContainerAnnotations(t *testing.T) {

pkg/kubelet/network/dns/dns_test.go

@@ -29,7 +29,9 @@ import (
 	"k8s.io/apimachinery/pkg/types"
 	"k8s.io/apimachinery/pkg/util/sets"
 	utilfeature "k8s.io/apiserver/pkg/util/feature"
+	utilfeaturetesting "k8s.io/apiserver/pkg/util/feature/testing"
 	"k8s.io/client-go/tools/record"
+	"k8s.io/kubernetes/pkg/features"
 	runtimeapi "k8s.io/kubernetes/pkg/kubelet/apis/cri/runtime/v1alpha2"
 
 	"github.com/stretchr/testify/assert"
@@ -266,14 +268,6 @@ func TestMergeDNSOptions(t *testing.T) {
 }
 
 func TestGetPodDNSType(t *testing.T) {
-	customDNSEnabled := utilfeature.DefaultFeatureGate.Enabled("CustomPodDNS")
-	defer func() {
-		// Restoring the old value.
-		if err := utilfeature.DefaultFeatureGate.Set(fmt.Sprintf("CustomPodDNS=%v", customDNSEnabled)); err != nil {
-			t.Errorf("Failed to set CustomPodDNS feature gate: %v", err)
-		}
-	}()
-
 	recorder := record.NewFakeRecorder(20)
 	nodeRef := &v1.ObjectReference{
 		Kind:      "Node",
@@ -361,28 +355,28 @@ func TestGetPodDNSType(t *testing.T) {
 	}
 
 	for _, tc := range testCases {
-		if err := utilfeature.DefaultFeatureGate.Set(fmt.Sprintf("CustomPodDNS=%v", tc.customPodDNSFeatureGate)); err != nil {
-			t.Errorf("Failed to set CustomPodDNS feature gate: %v", err)
-		}
+		t.Run(tc.desc, func(t *testing.T) {
+			defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.CustomPodDNS, tc.customPodDNSFeatureGate)()
 
-		if tc.hasClusterDNS {
-			configurer.clusterDNS = testClusterDNS
-		} else {
-			configurer.clusterDNS = nil
-		}
-		pod.Spec.DNSPolicy = tc.dnsPolicy
-		pod.Spec.HostNetwork = tc.hostNetwork
-
-		resType, err := getPodDNSType(pod)
-		if tc.expectedError {
-			if err == nil {
-				t.Errorf("%s: GetPodDNSType(%v) got no error, want error", tc.desc, pod)
+			if tc.hasClusterDNS {
+				configurer.clusterDNS = testClusterDNS
+			} else {
+				configurer.clusterDNS = nil
 			}
-			continue
-		}
-		if resType != tc.expectedDNSType {
-			t.Errorf("%s: GetPodDNSType(%v)=%v, want %v", tc.desc, pod, resType, tc.expectedDNSType)
-		}
+			pod.Spec.DNSPolicy = tc.dnsPolicy
+			pod.Spec.HostNetwork = tc.hostNetwork
+
+			resType, err := getPodDNSType(pod)
+			if tc.expectedError {
+				if err == nil {
+					t.Errorf("%s: GetPodDNSType(%v) got no error, want error", tc.desc, pod)
+				}
+				return
+			}
+			if resType != tc.expectedDNSType {
+				t.Errorf("%s: GetPodDNSType(%v)=%v, want %v", tc.desc, pod, resType, tc.expectedDNSType)
+			}
+		})
 	}
 }
 
@@ -482,14 +476,6 @@ func TestGetPodDNS(t *testing.T) {
 }
 
 func TestGetPodDNSCustom(t *testing.T) {
-	customDNSEnabled := utilfeature.DefaultFeatureGate.Enabled("CustomPodDNS")
-	defer func() {
-		// Restoring the old value.
-		if err := utilfeature.DefaultFeatureGate.Set(fmt.Sprintf("CustomPodDNS=%v", customDNSEnabled)); err != nil {
-			t.Errorf("Failed to set CustomPodDNS feature gate: %v", err)
-		}
-	}()
-
 	recorder := record.NewFakeRecorder(20)
 	nodeRef := &v1.ObjectReference{
 		Kind:      "Node",
@@ -628,21 +614,21 @@ func TestGetPodDNSCustom(t *testing.T) {
 	}
 
 	for _, tc := range testCases {
-		if err := utilfeature.DefaultFeatureGate.Set(fmt.Sprintf("CustomPodDNS=%v", tc.customPodDNSFeatureGate)); err != nil {
-			t.Errorf("Failed to set CustomPodDNS feature gate: %v", err)
-		}
+		t.Run(tc.desc, func(t *testing.T) {
+			defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.CustomPodDNS, tc.customPodDNSFeatureGate)()
 
-		testPod.Spec.HostNetwork = tc.hostnetwork
-		testPod.Spec.DNSConfig = tc.dnsConfig
-		testPod.Spec.DNSPolicy = tc.dnsPolicy
+			testPod.Spec.HostNetwork = tc.hostnetwork
+			testPod.Spec.DNSConfig = tc.dnsConfig
+			testPod.Spec.DNSPolicy = tc.dnsPolicy
 
-		resDNSConfig, err := configurer.GetPodDNS(testPod)
-		if err != nil {
-			t.Errorf("%s: GetPodDNS(%v), unexpected error: %v", tc.desc, testPod, err)
-		}
-		if !dnsConfigsAreEqual(resDNSConfig, tc.expectedDNSConfig) {
-			t.Errorf("%s: GetPodDNS(%v)=%v, want %v", tc.desc, testPod, resDNSConfig, tc.expectedDNSConfig)
-		}
+			resDNSConfig, err := configurer.GetPodDNS(testPod)
+			if err != nil {
+				t.Errorf("%s: GetPodDNS(%v), unexpected error: %v", tc.desc, testPod, err)
+			}
+			if !dnsConfigsAreEqual(resDNSConfig, tc.expectedDNSConfig) {
+				t.Errorf("%s: GetPodDNS(%v)=%v, want %v", tc.desc, testPod, resDNSConfig, tc.expectedDNSConfig)
+			}
+		})
 	}
 }
 

test/integration/apiserver/BUILD

@@ -43,6 +43,7 @@ go_test(
         "//staging/src/k8s.io/apimachinery/pkg/types:go_default_library",
         "//staging/src/k8s.io/apiserver/pkg/features:go_default_library",
         "//staging/src/k8s.io/apiserver/pkg/util/feature:go_default_library",
+        "//staging/src/k8s.io/apiserver/pkg/util/feature/testing:go_default_library",
         "//staging/src/k8s.io/cli-runtime/pkg/genericclioptions:go_default_library",
         "//staging/src/k8s.io/client-go/discovery:go_default_library",
         "//staging/src/k8s.io/client-go/kubernetes:go_default_library",

test/integration/apiserver/apiserver_test.go

@@ -32,8 +32,9 @@ import (
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apimachinery/pkg/runtime/schema"
-	genericfeatures "k8s.io/apiserver/pkg/features"
+	"k8s.io/apiserver/pkg/features"
 	utilfeature "k8s.io/apiserver/pkg/util/feature"
+	utilfeaturetesting "k8s.io/apiserver/pkg/util/feature/testing"
 	clientset "k8s.io/client-go/kubernetes"
 	restclient "k8s.io/client-go/rest"
 	"k8s.io/client-go/tools/pager"
@@ -170,9 +171,7 @@ func Test202StatusCode(t *testing.T) {
 }
 
 func TestAPIListChunking(t *testing.T) {
-	if err := utilfeature.DefaultFeatureGate.Set(string(genericfeatures.APIListChunking) + "=true"); err != nil {
-		t.Fatal(err)
-	}
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.APIListChunking, true)()
 	s, clientSet, closeFn := setup(t)
 	defer closeFn()
 

test/integration/daemonset/BUILD

@@ -33,6 +33,7 @@ go_test(
         "//staging/src/k8s.io/apimachinery/pkg/util/uuid:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/util/wait:go_default_library",
         "//staging/src/k8s.io/apiserver/pkg/util/feature:go_default_library",
+        "//staging/src/k8s.io/apiserver/pkg/util/feature/testing:go_default_library",
         "//staging/src/k8s.io/client-go/informers:go_default_library",
         "//staging/src/k8s.io/client-go/kubernetes:go_default_library",
         "//staging/src/k8s.io/client-go/kubernetes/typed/apps/v1:go_default_library",

test/integration/daemonset/daemonset_test.go

@@ -31,6 +31,7 @@ import (
 	"k8s.io/apimachinery/pkg/util/uuid"
 	"k8s.io/apimachinery/pkg/util/wait"
 	utilfeature "k8s.io/apiserver/pkg/util/feature"
+	utilfeaturetesting "k8s.io/apiserver/pkg/util/feature/testing"
 	"k8s.io/client-go/informers"
 	clientset "k8s.io/client-go/kubernetes"
 	appstyped "k8s.io/client-go/kubernetes/typed/apps/v1"
@@ -485,21 +486,12 @@ func updateDS(t *testing.T, dsClient appstyped.DaemonSetInterface, dsName string
 
 func forEachFeatureGate(t *testing.T, tf func(t *testing.T)) {
 	for _, fg := range featureGates() {
-		func() {
-			enabled := utilfeature.DefaultFeatureGate.Enabled(fg)
-			defer func() {
-				if err := utilfeature.DefaultFeatureGate.Set(fmt.Sprintf("%v=%t", fg, enabled)); err != nil {
-					t.Fatalf("Failed to set FeatureGate %v to %t", fg, enabled)
-				}
-			}()
-
-			for _, f := range []bool{true, false} {
-				if err := utilfeature.DefaultFeatureGate.Set(fmt.Sprintf("%v=%t", fg, f)); err != nil {
-					t.Fatalf("Failed to set FeatureGate %v to %t", fg, f)
-				}
+		for _, f := range []bool{true, false} {
+			func() {
+				defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, fg, f)()
 				t.Run(fmt.Sprintf("%v (%t)", fg, f), tf)
-			}
-		}()
+			}()
+		}
 	}
 }
 
@@ -704,23 +696,10 @@ func TestNotReadyNodeDaemonDoesLaunchPod(t *testing.T) {
 	})
 }
 
-func setFeatureGate(t *testing.T, feature utilfeature.Feature, enabled bool) {
-	if err := utilfeature.DefaultFeatureGate.Set(fmt.Sprintf("%s=%t", feature, enabled)); err != nil {
-		t.Fatalf("Failed to set FeatureGate %v to %t: %v", feature, enabled, err)
-	}
-}
-
 // When ScheduleDaemonSetPods is disabled, DaemonSets should not launch onto nodes with insufficient capacity.
 // Look for TestInsufficientCapacityNodeWhenScheduleDaemonSetPodsEnabled, we don't need this test anymore.
 func TestInsufficientCapacityNodeDaemonDoesNotLaunchPod(t *testing.T) {
-	enabled := utilfeature.DefaultFeatureGate.Enabled(features.ScheduleDaemonSetPods)
-	// Rollback feature gate.
-	defer func() {
-		if enabled {
-			setFeatureGate(t, features.ScheduleDaemonSetPods, true)
-		}
-	}()
-	setFeatureGate(t, features.ScheduleDaemonSetPods, false)
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.ScheduleDaemonSetPods, false)()
 	forEachStrategy(t, func(t *testing.T, strategy *apps.DaemonSetUpdateStrategy) {
 		server, closeFn, dc, informers, clientset := setup(t)
 		defer closeFn()
@@ -761,17 +740,7 @@ func TestInsufficientCapacityNodeDaemonDoesNotLaunchPod(t *testing.T) {
 // feature is enabled, the DaemonSet should create Pods for all the nodes regardless of available resource
 // on the nodes, and kube-scheduler should not schedule Pods onto the nodes with insufficient resource.
 func TestInsufficientCapacityNodeWhenScheduleDaemonSetPodsEnabled(t *testing.T) {
-	enabled := utilfeature.DefaultFeatureGate.Enabled(features.ScheduleDaemonSetPods)
-	defer func() {
-		if err := utilfeature.DefaultFeatureGate.Set(fmt.Sprintf("%s=%t",
-			features.ScheduleDaemonSetPods, enabled)); err != nil {
-			t.Fatalf("Failed to set FeatureGate %v to %t", features.ScheduleDaemonSetPods, enabled)
-		}
-	}()
-
-	if err := utilfeature.DefaultFeatureGate.Set(fmt.Sprintf("%s=%t", features.ScheduleDaemonSetPods, true)); err != nil {
-		t.Fatalf("Failed to set FeatureGate %v to %t", features.ScheduleDaemonSetPods, true)
-	}
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.ScheduleDaemonSetPods, true)()
 
 	forEachStrategy(t, func(t *testing.T, strategy *apps.DaemonSetUpdateStrategy) {
 		server, closeFn, dc, informers, clientset := setup(t)
@@ -1012,16 +981,7 @@ func TestTaintedNode(t *testing.T) {
 // TestUnschedulableNodeDaemonDoesLaunchPod tests that the DaemonSet Pods can still be scheduled
 // to the Unschedulable nodes when TaintNodesByCondition are enabled.
 func TestUnschedulableNodeDaemonDoesLaunchPod(t *testing.T) {
-	enabledTaint := utilfeature.DefaultFeatureGate.Enabled(features.TaintNodesByCondition)
-	defer func() {
-		if err := utilfeature.DefaultFeatureGate.Set(fmt.Sprintf("%s=%t",
-			features.TaintNodesByCondition, enabledTaint)); err != nil {
-			t.Fatalf("Failed to set FeatureGate %v to %t", features.TaintNodesByCondition, enabledTaint)
-		}
-	}()
-	if err := utilfeature.DefaultFeatureGate.Set(fmt.Sprintf("%s=%t", features.TaintNodesByCondition, true)); err != nil {
-		t.Fatalf("Failed to set FeatureGate %v to %t", features.TaintNodesByCondition, true)
-	}
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.TaintNodesByCondition, true)()
 
 	forEachFeatureGate(t, func(t *testing.T) {
 		forEachStrategy(t, func(t *testing.T, strategy *apps.DaemonSetUpdateStrategy) {

test/integration/scheduler/BUILD

@@ -54,6 +54,7 @@ go_test(
         "//staging/src/k8s.io/apimachinery/pkg/util/sets:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/util/wait:go_default_library",
         "//staging/src/k8s.io/apiserver/pkg/util/feature:go_default_library",
+        "//staging/src/k8s.io/apiserver/pkg/util/feature/testing:go_default_library",
         "//staging/src/k8s.io/client-go/informers:go_default_library",
         "//staging/src/k8s.io/client-go/kubernetes:go_default_library",
         "//staging/src/k8s.io/client-go/kubernetes/typed/core/v1:go_default_library",

test/integration/scheduler/preemption_test.go

@@ -31,6 +31,7 @@ import (
 	"k8s.io/apimachinery/pkg/util/intstr"
 	"k8s.io/apimachinery/pkg/util/wait"
 	utilfeature "k8s.io/apiserver/pkg/util/feature"
+	utilfeaturetesting "k8s.io/apiserver/pkg/util/feature/testing"
 	clientset "k8s.io/client-go/kubernetes"
 	"k8s.io/kubernetes/pkg/features"
 	_ "k8s.io/kubernetes/pkg/scheduler/algorithmprovider"
@@ -64,7 +65,7 @@ func waitForNominatedNodeName(cs clientset.Interface, pod *v1.Pod) error {
 // TestPreemption tests a few preemption scenarios.
 func TestPreemption(t *testing.T) {
 	// Enable PodPriority feature gate.
-	utilfeature.DefaultFeatureGate.Set(fmt.Sprintf("%s=true", features.PodPriority))
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.PodPriority, true)()
 	// Initialize scheduler.
 	context := initTest(t, "preemption")
 	defer cleanupTest(t, context)
@@ -292,7 +293,7 @@ func TestPreemption(t *testing.T) {
 // TestDisablePreemption tests disable pod preemption of scheduler works as expected.
 func TestDisablePreemption(t *testing.T) {
 	// Enable PodPriority feature gate.
-	utilfeature.DefaultFeatureGate.Set(fmt.Sprintf("%s=true", features.PodPriority))
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.PodPriority, true)()
 	// Initialize scheduler, and disable preemption.
 	context := initTestDisablePreemption(t, "disable-preemption")
 	defer cleanupTest(t, context)
@@ -394,7 +395,7 @@ func mkPriorityPodWithGrace(tc *TestContext, name string, priority int32, grace
 // after preemption and while the higher priority pods is not scheduled yet.
 func TestPreemptionStarvation(t *testing.T) {
 	// Enable PodPriority feature gate.
-	utilfeature.DefaultFeatureGate.Set(fmt.Sprintf("%s=true", features.PodPriority))
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.PodPriority, true)()
 	// Initialize scheduler.
 	context := initTest(t, "preemption")
 	defer cleanupTest(t, context)
@@ -501,7 +502,7 @@ func TestPreemptionStarvation(t *testing.T) {
 //    node name of the medium priority pod is cleared.
 func TestNominatedNodeCleanUp(t *testing.T) {
 	// Enable PodPriority feature gate.
-	utilfeature.DefaultFeatureGate.Set(fmt.Sprintf("%s=true", features.PodPriority))
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.PodPriority, true)()
 	// Initialize scheduler.
 	context := initTest(t, "preemption")
 	defer cleanupTest(t, context)
@@ -615,7 +616,7 @@ func addPodConditionReady(pod *v1.Pod) {
 // TestPDBInPreemption tests PodDisruptionBudget support in preemption.
 func TestPDBInPreemption(t *testing.T) {
 	// Enable PodPriority feature gate.
-	utilfeature.DefaultFeatureGate.Set(fmt.Sprintf("%s=true", features.PodPriority))
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.PodPriority, true)()
 	// Initialize scheduler.
 	context := initTest(t, "preemption-pdb")
 	defer cleanupTest(t, context)

test/integration/scheduler/taint_test.go

@@ -28,10 +28,12 @@ import (
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime/schema"
 	utilfeature "k8s.io/apiserver/pkg/util/feature"
+	utilfeaturetesting "k8s.io/apiserver/pkg/util/feature/testing"
 	"k8s.io/client-go/informers"
 	"k8s.io/client-go/kubernetes"
 	restclient "k8s.io/client-go/rest"
 	"k8s.io/kubernetes/pkg/controller/nodelifecycle"
+	"k8s.io/kubernetes/pkg/features"
 	"k8s.io/kubernetes/pkg/scheduler/algorithmprovider"
 	schedulerapi "k8s.io/kubernetes/pkg/scheduler/api"
 	"k8s.io/kubernetes/plugin/pkg/admission/podtolerationrestriction"
@@ -61,14 +63,8 @@ func newPod(nsName, name string, req, limit v1.ResourceList) *v1.Pod {
 
 // TestTaintNodeByCondition tests related cases for TaintNodeByCondition feature.
 func TestTaintNodeByCondition(t *testing.T) {
-	enabled := utilfeature.DefaultFeatureGate.Enabled("TaintNodesByCondition")
-	defer func() {
-		if !enabled {
-			utilfeature.DefaultFeatureGate.Set("TaintNodesByCondition=False")
-		}
-	}()
 	// Enable TaintNodeByCondition
-	utilfeature.DefaultFeatureGate.Set("TaintNodesByCondition=True")
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.TaintNodesByCondition, true)()
 
 	// Build PodToleration Admission.
 	admission := podtolerationrestriction.NewPodTolerationsPlugin(&pluginapi.Configuration{})

test/integration/scheduler/volume_binding_test.go

@@ -36,10 +36,12 @@ import (
 	"k8s.io/apimachinery/pkg/util/sets"
 	"k8s.io/apimachinery/pkg/util/wait"
 	utilfeature "k8s.io/apiserver/pkg/util/feature"
+	utilfeaturetesting "k8s.io/apiserver/pkg/util/feature/testing"
 	"k8s.io/client-go/informers"
 	clientset "k8s.io/client-go/kubernetes"
 	"k8s.io/kubernetes/pkg/controller/volume/persistentvolume"
 	persistentvolumeoptions "k8s.io/kubernetes/pkg/controller/volume/persistentvolume/options"
+	"k8s.io/kubernetes/pkg/features"
 	"k8s.io/kubernetes/pkg/scheduler/algorithm/predicates"
 	"k8s.io/kubernetes/pkg/volume"
 	volumetest "k8s.io/kubernetes/pkg/volume/testing"
@@ -95,11 +97,9 @@ type testPVC struct {
 }
 
 func TestVolumeBinding(t *testing.T) {
-	features := map[string]bool{
-		"VolumeScheduling":       true,
-		"PersistentLocalVolumes": true,
-	}
-	config := setupCluster(t, "volume-scheduling-", 2, features, 0, 0, true)
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.VolumeScheduling, true)()
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.PersistentLocalVolumes, true)()
+	config := setupCluster(t, "volume-scheduling-", 2, 0, 0, true)
 	defer config.teardown()
 
 	cases := map[string]struct {
@@ -268,11 +268,9 @@ func TestVolumeBinding(t *testing.T) {
 
 // TestVolumeBindingRescheduling tests scheduler will retry scheduling when needed.
 func TestVolumeBindingRescheduling(t *testing.T) {
-	features := map[string]bool{
-		"VolumeScheduling":       true,
-		"PersistentLocalVolumes": true,
-	}
-	config := setupCluster(t, "volume-scheduling-", 2, features, 0, 0, true)
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.VolumeScheduling, true)()
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.PersistentLocalVolumes, true)()
+	config := setupCluster(t, "volume-scheduling-", 2, 0, 0, true)
 	defer config.teardown()
 
 	storageClassName := "local-storage"
@@ -414,11 +412,9 @@ func TestVolumeBindingDynamicStressSlow(t *testing.T) {
 }
 
 func testVolumeBindingStress(t *testing.T, schedulerResyncPeriod time.Duration, dynamic bool, provisionDelaySeconds int) {
-	features := map[string]bool{
-		"VolumeScheduling":       true,
-		"PersistentLocalVolumes": true,
-	}
-	config := setupCluster(t, "volume-binding-stress-", 1, features, schedulerResyncPeriod, provisionDelaySeconds, true)
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.VolumeScheduling, true)()
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.PersistentLocalVolumes, true)()
+	config := setupCluster(t, "volume-binding-stress-", 1, schedulerResyncPeriod, provisionDelaySeconds, true)
 	defer config.teardown()
 
 	// Set max volume limit to the number of PVCs the test will create
@@ -491,12 +487,10 @@ func testVolumeBindingStress(t *testing.T, schedulerResyncPeriod time.Duration,
 }
 
 func testVolumeBindingWithAffinity(t *testing.T, anti bool, numNodes, numPods, numPVsFirstNode int) {
-	features := map[string]bool{
-		"VolumeScheduling":       true,
-		"PersistentLocalVolumes": true,
-	}
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.VolumeScheduling, true)()
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.PersistentLocalVolumes, true)()
 	// TODO: disable equivalence cache until kubernetes/kubernetes#67680 is fixed
-	config := setupCluster(t, "volume-pod-affinity-", numNodes, features, 0, 0, true)
+	config := setupCluster(t, "volume-pod-affinity-", numNodes, 0, 0, true)
 	defer config.teardown()
 
 	pods := []*v1.Pod{}
@@ -621,11 +615,9 @@ func TestVolumeBindingWithAffinity(t *testing.T) {
 }
 
 func TestPVAffinityConflict(t *testing.T) {
-	features := map[string]bool{
-		"VolumeScheduling":       true,
-		"PersistentLocalVolumes": true,
-	}
-	config := setupCluster(t, "volume-scheduling-", 3, features, 0, 0, true)
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.VolumeScheduling, true)()
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.PersistentLocalVolumes, true)()
+	config := setupCluster(t, "volume-scheduling-", 3, 0, 0, true)
 	defer config.teardown()
 
 	pv := makePV("local-pv", classImmediate, "", "", node1)
@@ -684,11 +676,9 @@ func TestPVAffinityConflict(t *testing.T) {
 }
 
 func TestVolumeProvision(t *testing.T) {
-	features := map[string]bool{
-		"VolumeScheduling":       true,
-		"PersistentLocalVolumes": true,
-	}
-	config := setupCluster(t, "volume-scheduling", 1, features, 0, 0, true)
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.VolumeScheduling, true)()
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.PersistentLocalVolumes, true)()
+	config := setupCluster(t, "volume-scheduling", 1, 0, 0, true)
 	defer config.teardown()
 
 	cases := map[string]struct {
@@ -825,15 +815,8 @@ func TestVolumeProvision(t *testing.T) {
 // selectedNode annotation from a claim to reschedule volume provision
 // on provision failure.
 func TestRescheduleProvisioning(t *testing.T) {
-	features := map[string]bool{
-		"VolumeScheduling": true,
-	}
-	oldFeatures := make(map[string]bool, len(features))
-	for feature := range features {
-		oldFeatures[feature] = utilfeature.DefaultFeatureGate.Enabled(utilfeature.Feature(feature))
-	}
 	// Set feature gates
-	utilfeature.DefaultFeatureGate.SetFromMap(features)
+	defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.VolumeScheduling, true)()
 	controllerCh := make(chan struct{})
 
 	context := initTestMaster(t, "reschedule-volume-provision", nil)
@@ -846,8 +829,6 @@ func TestRescheduleProvisioning(t *testing.T) {
 		deleteTestObjects(clientset, ns, nil)
 		context.clientSet.CoreV1().Nodes().DeleteCollection(nil, metav1.ListOptions{})
 		context.closeFn()
-		// Restore feature gates
-		utilfeature.DefaultFeatureGate.SetFromMap(oldFeatures)
 	}()
 
 	ctrl, informerFactory, err := initPVController(context, 0)
@@ -893,14 +874,7 @@ func TestRescheduleProvisioning(t *testing.T) {
 	}
 }
 
-func setupCluster(t *testing.T, nsName string, numberOfNodes int, features map[string]bool, resyncPeriod time.Duration, provisionDelaySeconds int, disableEquivalenceCache bool) *testConfig {
-	oldFeatures := make(map[string]bool, len(features))
-	for feature := range features {
-		oldFeatures[feature] = utilfeature.DefaultFeatureGate.Enabled(utilfeature.Feature(feature))
-	}
-	// Set feature gates
-	utilfeature.DefaultFeatureGate.SetFromMap(features)
-
+func setupCluster(t *testing.T, nsName string, numberOfNodes int, resyncPeriod time.Duration, provisionDelaySeconds int, disableEquivalenceCache bool) *testConfig {
 	context := initTestSchedulerWithOptions(t, initTestMaster(t, nsName, nil), false, nil, false, disableEquivalenceCache, resyncPeriod)
 
 	clientset := context.clientSet
@@ -938,8 +912,6 @@ func setupCluster(t *testing.T, nsName string, numberOfNodes int, features map[s
 		teardown: func() {
 			deleteTestObjects(clientset, ns, nil)
 			cleanupTest(t, context)
-			// Restore feature gates
-			utilfeature.DefaultFeatureGate.SetFromMap(oldFeatures)
 		},
 	}
 }