/*
Copyright 2017 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 pod

import (
	"fmt"
	"reflect"
	"strings"
	"testing"

	"k8s.io/apimachinery/pkg/api/resource"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/util/diff"
	"k8s.io/apimachinery/pkg/util/sets"
	"k8s.io/apimachinery/pkg/util/validation/field"
	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/features"
	"k8s.io/kubernetes/pkg/security/apparmor"
)

func TestPodSecrets(t *testing.T) {
	// Stub containing all possible secret references in a pod.
	// The names of the referenced secrets match struct paths detected by reflection.
	pod := &api.Pod{
		Spec: api.PodSpec{
			Containers: []api.Container{{
				EnvFrom: []api.EnvFromSource{{
					SecretRef: &api.SecretEnvSource{
						LocalObjectReference: api.LocalObjectReference{
							Name: "Spec.Containers[*].EnvFrom[*].SecretRef"}}}},
				Env: []api.EnvVar{{
					ValueFrom: &api.EnvVarSource{
						SecretKeyRef: &api.SecretKeySelector{
							LocalObjectReference: api.LocalObjectReference{
								Name: "Spec.Containers[*].Env[*].ValueFrom.SecretKeyRef"}}}}}}},
			ImagePullSecrets: []api.LocalObjectReference{{
				Name: "Spec.ImagePullSecrets"}},
			InitContainers: []api.Container{{
				EnvFrom: []api.EnvFromSource{{
					SecretRef: &api.SecretEnvSource{
						LocalObjectReference: api.LocalObjectReference{
							Name: "Spec.InitContainers[*].EnvFrom[*].SecretRef"}}}},
				Env: []api.EnvVar{{
					ValueFrom: &api.EnvVarSource{
						SecretKeyRef: &api.SecretKeySelector{
							LocalObjectReference: api.LocalObjectReference{
								Name: "Spec.InitContainers[*].Env[*].ValueFrom.SecretKeyRef"}}}}}}},
			Volumes: []api.Volume{{
				VolumeSource: api.VolumeSource{
					AzureFile: &api.AzureFileVolumeSource{
						SecretName: "Spec.Volumes[*].VolumeSource.AzureFile.SecretName"}}}, {
				VolumeSource: api.VolumeSource{
					CephFS: &api.CephFSVolumeSource{
						SecretRef: &api.LocalObjectReference{
							Name: "Spec.Volumes[*].VolumeSource.CephFS.SecretRef"}}}}, {
				VolumeSource: api.VolumeSource{
					Cinder: &api.CinderVolumeSource{
						SecretRef: &api.LocalObjectReference{
							Name: "Spec.Volumes[*].VolumeSource.Cinder.SecretRef"}}}}, {
				VolumeSource: api.VolumeSource{
					FlexVolume: &api.FlexVolumeSource{
						SecretRef: &api.LocalObjectReference{
							Name: "Spec.Volumes[*].VolumeSource.FlexVolume.SecretRef"}}}}, {
				VolumeSource: api.VolumeSource{
					Projected: &api.ProjectedVolumeSource{
						Sources: []api.VolumeProjection{{
							Secret: &api.SecretProjection{
								LocalObjectReference: api.LocalObjectReference{
									Name: "Spec.Volumes[*].VolumeSource.Projected.Sources[*].Secret"}}}}}}}, {
				VolumeSource: api.VolumeSource{
					RBD: &api.RBDVolumeSource{
						SecretRef: &api.LocalObjectReference{
							Name: "Spec.Volumes[*].VolumeSource.RBD.SecretRef"}}}}, {
				VolumeSource: api.VolumeSource{
					Secret: &api.SecretVolumeSource{
						SecretName: "Spec.Volumes[*].VolumeSource.Secret.SecretName"}}}, {
				VolumeSource: api.VolumeSource{
					Secret: &api.SecretVolumeSource{
						SecretName: "Spec.Volumes[*].VolumeSource.Secret"}}}, {
				VolumeSource: api.VolumeSource{
					ScaleIO: &api.ScaleIOVolumeSource{
						SecretRef: &api.LocalObjectReference{
							Name: "Spec.Volumes[*].VolumeSource.ScaleIO.SecretRef"}}}}, {
				VolumeSource: api.VolumeSource{
					ISCSI: &api.ISCSIVolumeSource{
						SecretRef: &api.LocalObjectReference{
							Name: "Spec.Volumes[*].VolumeSource.ISCSI.SecretRef"}}}}, {
				VolumeSource: api.VolumeSource{
					StorageOS: &api.StorageOSVolumeSource{
						SecretRef: &api.LocalObjectReference{
							Name: "Spec.Volumes[*].VolumeSource.StorageOS.SecretRef"}}}}},
		},
	}
	extractedNames := sets.NewString()
	VisitPodSecretNames(pod, func(name string) bool {
		extractedNames.Insert(name)
		return true
	})

	// excludedSecretPaths holds struct paths to fields with "secret" in the name that are not actually references to secret API objects
	excludedSecretPaths := sets.NewString(
		"Spec.Volumes[*].VolumeSource.CephFS.SecretFile",
	)
	// expectedSecretPaths holds struct paths to fields with "secret" in the name that are references to secret API objects.
	// every path here should be represented as an example in the Pod stub above, with the secret name set to the path.
	expectedSecretPaths := sets.NewString(
		"Spec.Containers[*].EnvFrom[*].SecretRef",
		"Spec.Containers[*].Env[*].ValueFrom.SecretKeyRef",
		"Spec.ImagePullSecrets",
		"Spec.InitContainers[*].EnvFrom[*].SecretRef",
		"Spec.InitContainers[*].Env[*].ValueFrom.SecretKeyRef",
		"Spec.Volumes[*].VolumeSource.AzureFile.SecretName",
		"Spec.Volumes[*].VolumeSource.CephFS.SecretRef",
		"Spec.Volumes[*].VolumeSource.Cinder.SecretRef",
		"Spec.Volumes[*].VolumeSource.FlexVolume.SecretRef",
		"Spec.Volumes[*].VolumeSource.Projected.Sources[*].Secret",
		"Spec.Volumes[*].VolumeSource.RBD.SecretRef",
		"Spec.Volumes[*].VolumeSource.Secret",
		"Spec.Volumes[*].VolumeSource.Secret.SecretName",
		"Spec.Volumes[*].VolumeSource.ScaleIO.SecretRef",
		"Spec.Volumes[*].VolumeSource.ISCSI.SecretRef",
		"Spec.Volumes[*].VolumeSource.StorageOS.SecretRef",
	)
	secretPaths := collectResourcePaths(t, "secret", nil, "", reflect.TypeOf(&api.Pod{}))
	secretPaths = secretPaths.Difference(excludedSecretPaths)
	if missingPaths := expectedSecretPaths.Difference(secretPaths); len(missingPaths) > 0 {
		t.Logf("Missing expected secret paths:\n%s", strings.Join(missingPaths.List(), "\n"))
		t.Error("Missing expected secret paths. Verify VisitPodSecretNames() is correctly finding the missing paths, then correct expectedSecretPaths")
	}
	if extraPaths := secretPaths.Difference(expectedSecretPaths); len(extraPaths) > 0 {
		t.Logf("Extra secret paths:\n%s", strings.Join(extraPaths.List(), "\n"))
		t.Error("Extra fields with 'secret' in the name found. Verify VisitPodSecretNames() is including these fields if appropriate, then correct expectedSecretPaths")
	}

	if missingNames := expectedSecretPaths.Difference(extractedNames); len(missingNames) > 0 {
		t.Logf("Missing expected secret names:\n%s", strings.Join(missingNames.List(), "\n"))
		t.Error("Missing expected secret names. Verify the pod stub above includes these references, then verify VisitPodSecretNames() is correctly finding the missing names")
	}
	if extraNames := extractedNames.Difference(expectedSecretPaths); len(extraNames) > 0 {
		t.Logf("Extra secret names:\n%s", strings.Join(extraNames.List(), "\n"))
		t.Error("Extra secret names extracted. Verify VisitPodSecretNames() is correctly extracting secret names")
	}
}

// collectResourcePaths traverses the object, computing all the struct paths that lead to fields with resourcename in the name.
func collectResourcePaths(t *testing.T, resourcename string, path *field.Path, name string, tp reflect.Type) sets.String {
	resourcename = strings.ToLower(resourcename)
	resourcePaths := sets.NewString()

	if tp.Kind() == reflect.Ptr {
		resourcePaths.Insert(collectResourcePaths(t, resourcename, path, name, tp.Elem()).List()...)
		return resourcePaths
	}

	if strings.Contains(strings.ToLower(name), resourcename) {
		resourcePaths.Insert(path.String())
	}

	switch tp.Kind() {
	case reflect.Ptr:
		resourcePaths.Insert(collectResourcePaths(t, resourcename, path, name, tp.Elem()).List()...)
	case reflect.Struct:
		// ObjectMeta is generic and therefore should never have a field with a specific resource's name;
		// it contains cycles so it's easiest to just skip it.
		if name == "ObjectMeta" {
			break
		}
		for i := 0; i < tp.NumField(); i++ {
			field := tp.Field(i)
			resourcePaths.Insert(collectResourcePaths(t, resourcename, path.Child(field.Name), field.Name, field.Type).List()...)
		}
	case reflect.Interface:
		t.Errorf("cannot find %s fields in interface{} field %s", resourcename, path.String())
	case reflect.Map:
		resourcePaths.Insert(collectResourcePaths(t, resourcename, path.Key("*"), "", tp.Elem()).List()...)
	case reflect.Slice:
		resourcePaths.Insert(collectResourcePaths(t, resourcename, path.Key("*"), "", tp.Elem()).List()...)
	default:
		// all primitive types
	}

	return resourcePaths
}

func TestPodConfigmaps(t *testing.T) {
	// Stub containing all possible ConfigMap references in a pod.
	// The names of the referenced ConfigMaps match struct paths detected by reflection.
	pod := &api.Pod{
		Spec: api.PodSpec{
			Containers: []api.Container{{
				EnvFrom: []api.EnvFromSource{{
					ConfigMapRef: &api.ConfigMapEnvSource{
						LocalObjectReference: api.LocalObjectReference{
							Name: "Spec.Containers[*].EnvFrom[*].ConfigMapRef"}}}},
				Env: []api.EnvVar{{
					ValueFrom: &api.EnvVarSource{
						ConfigMapKeyRef: &api.ConfigMapKeySelector{
							LocalObjectReference: api.LocalObjectReference{
								Name: "Spec.Containers[*].Env[*].ValueFrom.ConfigMapKeyRef"}}}}}}},
			InitContainers: []api.Container{{
				EnvFrom: []api.EnvFromSource{{
					ConfigMapRef: &api.ConfigMapEnvSource{
						LocalObjectReference: api.LocalObjectReference{
							Name: "Spec.InitContainers[*].EnvFrom[*].ConfigMapRef"}}}},
				Env: []api.EnvVar{{
					ValueFrom: &api.EnvVarSource{
						ConfigMapKeyRef: &api.ConfigMapKeySelector{
							LocalObjectReference: api.LocalObjectReference{
								Name: "Spec.InitContainers[*].Env[*].ValueFrom.ConfigMapKeyRef"}}}}}}},
			Volumes: []api.Volume{{
				VolumeSource: api.VolumeSource{
					Projected: &api.ProjectedVolumeSource{
						Sources: []api.VolumeProjection{{
							ConfigMap: &api.ConfigMapProjection{
								LocalObjectReference: api.LocalObjectReference{
									Name: "Spec.Volumes[*].VolumeSource.Projected.Sources[*].ConfigMap"}}}}}}}, {
				VolumeSource: api.VolumeSource{
					ConfigMap: &api.ConfigMapVolumeSource{
						LocalObjectReference: api.LocalObjectReference{
							Name: "Spec.Volumes[*].VolumeSource.ConfigMap"}}}}},
		},
	}
	extractedNames := sets.NewString()
	VisitPodConfigmapNames(pod, func(name string) bool {
		extractedNames.Insert(name)
		return true
	})

	// expectedPaths holds struct paths to fields with "ConfigMap" in the name that are references to ConfigMap API objects.
	// every path here should be represented as an example in the Pod stub above, with the ConfigMap name set to the path.
	expectedPaths := sets.NewString(
		"Spec.Containers[*].EnvFrom[*].ConfigMapRef",
		"Spec.Containers[*].Env[*].ValueFrom.ConfigMapKeyRef",
		"Spec.InitContainers[*].EnvFrom[*].ConfigMapRef",
		"Spec.InitContainers[*].Env[*].ValueFrom.ConfigMapKeyRef",
		"Spec.Volumes[*].VolumeSource.Projected.Sources[*].ConfigMap",
		"Spec.Volumes[*].VolumeSource.ConfigMap",
	)
	collectPaths := collectResourcePaths(t, "ConfigMap", nil, "", reflect.TypeOf(&api.Pod{}))
	if missingPaths := expectedPaths.Difference(collectPaths); len(missingPaths) > 0 {
		t.Logf("Missing expected paths:\n%s", strings.Join(missingPaths.List(), "\n"))
		t.Error("Missing expected paths. Verify VisitPodConfigmapNames() is correctly finding the missing paths, then correct expectedPaths")
	}
	if extraPaths := collectPaths.Difference(expectedPaths); len(extraPaths) > 0 {
		t.Logf("Extra paths:\n%s", strings.Join(extraPaths.List(), "\n"))
		t.Error("Extra fields with resource in the name found. Verify VisitPodConfigmapNames() is including these fields if appropriate, then correct expectedPaths")
	}

	if missingNames := expectedPaths.Difference(extractedNames); len(missingNames) > 0 {
		t.Logf("Missing expected names:\n%s", strings.Join(missingNames.List(), "\n"))
		t.Error("Missing expected names. Verify the pod stub above includes these references, then verify VisitPodConfigmapNames() is correctly finding the missing names")
	}
	if extraNames := extractedNames.Difference(expectedPaths); len(extraNames) > 0 {
		t.Logf("Extra names:\n%s", strings.Join(extraNames.List(), "\n"))
		t.Error("Extra names extracted. Verify VisitPodConfigmapNames() is correctly extracting resource names")
	}
}

func TestDropAlphaVolumeDevices(t *testing.T) {
	podWithVolumeDevices := func() *api.Pod {
		return &api.Pod{
			Spec: api.PodSpec{
				RestartPolicy: api.RestartPolicyNever,
				Containers: []api.Container{
					{
						Name:  "container1",
						Image: "testimage",
						VolumeDevices: []api.VolumeDevice{
							{
								Name:       "myvolume",
								DevicePath: "/usr/test",
							},
						},
					},
				},
				InitContainers: []api.Container{
					{
						Name:  "container1",
						Image: "testimage",
						VolumeDevices: []api.VolumeDevice{
							{
								Name:       "myvolume",
								DevicePath: "/usr/test",
							},
						},
					},
				},
				Volumes: []api.Volume{
					{
						Name: "myvolume",
						VolumeSource: api.VolumeSource{
							HostPath: &api.HostPathVolumeSource{
								Path: "/dev/xvdc",
							},
						},
					},
				},
			},
		}
	}
	podWithoutVolumeDevices := func() *api.Pod {
		return &api.Pod{
			Spec: api.PodSpec{
				RestartPolicy: api.RestartPolicyNever,
				Containers: []api.Container{
					{
						Name:  "container1",
						Image: "testimage",
					},
				},
				InitContainers: []api.Container{
					{
						Name:  "container1",
						Image: "testimage",
					},
				},
				Volumes: []api.Volume{
					{
						Name: "myvolume",
						VolumeSource: api.VolumeSource{
							HostPath: &api.HostPathVolumeSource{
								Path: "/dev/xvdc",
							},
						},
					},
				},
			},
		}
	}

	podInfo := []struct {
		description      string
		hasVolumeDevices bool
		pod              func() *api.Pod
	}{
		{
			description:      "has VolumeDevices",
			hasVolumeDevices: true,
			pod:              podWithVolumeDevices,
		},
		{
			description:      "does not have VolumeDevices",
			hasVolumeDevices: false,
			pod:              podWithoutVolumeDevices,
		},
		{
			description:      "is nil",
			hasVolumeDevices: false,
			pod:              func() *api.Pod { return nil },
		},
	}

	for _, enabled := range []bool{true, false} {
		for _, oldPodInfo := range podInfo {
			for _, newPodInfo := range podInfo {
				oldPodHasVolumeDevices, oldPod := oldPodInfo.hasVolumeDevices, oldPodInfo.pod()
				newPodHasVolumeDevices, newPod := newPodInfo.hasVolumeDevices, newPodInfo.pod()
				if newPod == nil {
					continue
				}

				t.Run(fmt.Sprintf("feature enabled=%v, old pod %v, new pod %v", enabled, oldPodInfo.description, newPodInfo.description), func(t *testing.T) {
					defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.BlockVolume, enabled)()

					var oldPodSpec *api.PodSpec
					if oldPod != nil {
						oldPodSpec = &oldPod.Spec
					}
					dropDisabledFields(&newPod.Spec, nil, oldPodSpec, nil)

					// old pod should never be changed
					if !reflect.DeepEqual(oldPod, oldPodInfo.pod()) {
						t.Errorf("old pod changed: %v", diff.ObjectReflectDiff(oldPod, oldPodInfo.pod()))
					}

					switch {
					case enabled || oldPodHasVolumeDevices:
						// new pod should not be changed if the feature is enabled, or if the old pod had VolumeDevices
						if !reflect.DeepEqual(newPod, newPodInfo.pod()) {
							t.Errorf("new pod changed: %v", diff.ObjectReflectDiff(newPod, newPodInfo.pod()))
						}
					case newPodHasVolumeDevices:
						// new pod should be changed
						if reflect.DeepEqual(newPod, newPodInfo.pod()) {
							t.Errorf("new pod was not changed")
						}
						// new pod should not have VolumeDevices
						if !reflect.DeepEqual(newPod, podWithoutVolumeDevices()) {
							t.Errorf("new pod had VolumeDevices: %v", diff.ObjectReflectDiff(newPod, podWithoutVolumeDevices()))
						}
					default:
						// new pod should not need to be changed
						if !reflect.DeepEqual(newPod, newPodInfo.pod()) {
							t.Errorf("new pod changed: %v", diff.ObjectReflectDiff(newPod, newPodInfo.pod()))
						}
					}
				})
			}
		}
	}
}

func TestDropSubPath(t *testing.T) {
	podWithSubpaths := func() *api.Pod {
		return &api.Pod{
			Spec: api.PodSpec{
				RestartPolicy:  api.RestartPolicyNever,
				Containers:     []api.Container{{Name: "container1", Image: "testimage", VolumeMounts: []api.VolumeMount{{Name: "a", SubPath: "foo"}, {Name: "a", SubPath: "foo2"}, {Name: "a", SubPath: "foo3"}}}},
				InitContainers: []api.Container{{Name: "container1", Image: "testimage", VolumeMounts: []api.VolumeMount{{Name: "a", SubPath: "foo"}, {Name: "a", SubPath: "foo2"}}}},
				Volumes:        []api.Volume{{Name: "a", VolumeSource: api.VolumeSource{HostPath: &api.HostPathVolumeSource{Path: "/dev/xvdc"}}}},
			},
		}
	}
	podWithoutSubpaths := func() *api.Pod {
		return &api.Pod{
			Spec: api.PodSpec{
				RestartPolicy:  api.RestartPolicyNever,
				Containers:     []api.Container{{Name: "container1", Image: "testimage", VolumeMounts: []api.VolumeMount{{Name: "a", SubPath: ""}, {Name: "a", SubPath: ""}, {Name: "a", SubPath: ""}}}},
				InitContainers: []api.Container{{Name: "container1", Image: "testimage", VolumeMounts: []api.VolumeMount{{Name: "a", SubPath: ""}, {Name: "a", SubPath: ""}}}},
				Volumes:        []api.Volume{{Name: "a", VolumeSource: api.VolumeSource{HostPath: &api.HostPathVolumeSource{Path: "/dev/xvdc"}}}},
			},
		}
	}

	podInfo := []struct {
		description string
		hasSubpaths bool
		pod         func() *api.Pod
	}{
		{
			description: "has subpaths",
			hasSubpaths: true,
			pod:         podWithSubpaths,
		},
		{
			description: "does not have subpaths",
			hasSubpaths: false,
			pod:         podWithoutSubpaths,
		},
		{
			description: "is nil",
			hasSubpaths: false,
			pod:         func() *api.Pod { return nil },
		},
	}

	for _, enabled := range []bool{true, false} {
		for _, oldPodInfo := range podInfo {
			for _, newPodInfo := range podInfo {
				oldPodHasSubpaths, oldPod := oldPodInfo.hasSubpaths, oldPodInfo.pod()
				newPodHasSubpaths, newPod := newPodInfo.hasSubpaths, newPodInfo.pod()
				if newPod == nil {
					continue
				}

				t.Run(fmt.Sprintf("feature enabled=%v, old pod %v, new pod %v", enabled, oldPodInfo.description, newPodInfo.description), func(t *testing.T) {
					defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.VolumeSubpath, enabled)()

					var oldPodSpec *api.PodSpec
					if oldPod != nil {
						oldPodSpec = &oldPod.Spec
					}
					dropDisabledFields(&newPod.Spec, nil, oldPodSpec, nil)

					// old pod should never be changed
					if !reflect.DeepEqual(oldPod, oldPodInfo.pod()) {
						t.Errorf("old pod changed: %v", diff.ObjectReflectDiff(oldPod, oldPodInfo.pod()))
					}

					switch {
					case enabled || oldPodHasSubpaths:
						// new pod should not be changed if the feature is enabled, or if the old pod had subpaths
						if !reflect.DeepEqual(newPod, newPodInfo.pod()) {
							t.Errorf("new pod changed: %v", diff.ObjectReflectDiff(newPod, newPodInfo.pod()))
						}
					case newPodHasSubpaths:
						// new pod should be changed
						if reflect.DeepEqual(newPod, newPodInfo.pod()) {
							t.Errorf("new pod was not changed")
						}
						// new pod should not have subpaths
						if !reflect.DeepEqual(newPod, podWithoutSubpaths()) {
							t.Errorf("new pod had subpaths: %v", diff.ObjectReflectDiff(newPod, podWithoutSubpaths()))
						}
					default:
						// new pod should not need to be changed
						if !reflect.DeepEqual(newPod, newPodInfo.pod()) {
							t.Errorf("new pod changed: %v", diff.ObjectReflectDiff(newPod, newPodInfo.pod()))
						}
					}
				})
			}
		}
	}
}

func TestDropRuntimeClass(t *testing.T) {
	runtimeClassName := "some_container_engine"
	podWithoutRuntimeClass := func() *api.Pod {
		return &api.Pod{
			Spec: api.PodSpec{
				RuntimeClassName: nil,
			},
		}
	}
	podWithRuntimeClass := func() *api.Pod {
		return &api.Pod{
			Spec: api.PodSpec{
				RuntimeClassName: &runtimeClassName,
			},
		}
	}

	podInfo := []struct {
		description            string
		hasPodRuntimeClassName bool
		pod                    func() *api.Pod
	}{
		{
			description:            "pod Without RuntimeClassName",
			hasPodRuntimeClassName: false,
			pod:                    podWithoutRuntimeClass,
		},
		{
			description:            "pod With RuntimeClassName",
			hasPodRuntimeClassName: true,
			pod:                    podWithRuntimeClass,
		},
		{
			description:            "is nil",
			hasPodRuntimeClassName: false,
			pod:                    func() *api.Pod { return nil },
		},
	}

	for _, enabled := range []bool{true, false} {
		for _, oldPodInfo := range podInfo {
			for _, newPodInfo := range podInfo {
				oldPodHasRuntimeClassName, oldPod := oldPodInfo.hasPodRuntimeClassName, oldPodInfo.pod()
				newPodHasRuntimeClassName, newPod := newPodInfo.hasPodRuntimeClassName, newPodInfo.pod()
				if newPod == nil {
					continue
				}

				t.Run(fmt.Sprintf("feature enabled=%v, old pod %v, new pod %v", enabled, oldPodInfo.description, newPodInfo.description), func(t *testing.T) {
					defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.RuntimeClass, enabled)()

					var oldPodSpec *api.PodSpec
					if oldPod != nil {
						oldPodSpec = &oldPod.Spec
					}
					dropDisabledFields(&newPod.Spec, nil, oldPodSpec, nil)

					// old pod should never be changed
					if !reflect.DeepEqual(oldPod, oldPodInfo.pod()) {
						t.Errorf("old pod changed: %v", diff.ObjectReflectDiff(oldPod, oldPodInfo.pod()))
					}

					switch {
					case enabled || oldPodHasRuntimeClassName:
						// new pod should not be changed if the feature is enabled, or if the old pod had RuntimeClass
						if !reflect.DeepEqual(newPod, newPodInfo.pod()) {
							t.Errorf("new pod changed: %v", diff.ObjectReflectDiff(newPod, newPodInfo.pod()))
						}
					case newPodHasRuntimeClassName:
						// new pod should be changed
						if reflect.DeepEqual(newPod, newPodInfo.pod()) {
							t.Errorf("new pod was not changed")
						}
						// new pod should not have RuntimeClass
						if !reflect.DeepEqual(newPod, podWithoutRuntimeClass()) {
							t.Errorf("new pod had PodRuntimeClassName: %v", diff.ObjectReflectDiff(newPod, podWithoutRuntimeClass()))
						}
					default:
						// new pod should not need to be changed
						if !reflect.DeepEqual(newPod, newPodInfo.pod()) {
							t.Errorf("new pod changed: %v", diff.ObjectReflectDiff(newPod, newPodInfo.pod()))
						}
					}
				})
			}
		}
	}
}

func TestDropProcMount(t *testing.T) {
	procMount := api.UnmaskedProcMount
	defaultProcMount := api.DefaultProcMount
	podWithProcMount := func() *api.Pod {
		return &api.Pod{
			Spec: api.PodSpec{
				RestartPolicy:  api.RestartPolicyNever,
				Containers:     []api.Container{{Name: "container1", Image: "testimage", SecurityContext: &api.SecurityContext{ProcMount: &procMount}}},
				InitContainers: []api.Container{{Name: "container1", Image: "testimage", SecurityContext: &api.SecurityContext{ProcMount: &procMount}}},
			},
		}
	}
	podWithoutProcMount := func() *api.Pod {
		return &api.Pod{
			Spec: api.PodSpec{
				RestartPolicy:  api.RestartPolicyNever,
				Containers:     []api.Container{{Name: "container1", Image: "testimage", SecurityContext: &api.SecurityContext{ProcMount: &defaultProcMount}}},
				InitContainers: []api.Container{{Name: "container1", Image: "testimage", SecurityContext: &api.SecurityContext{ProcMount: &defaultProcMount}}},
			},
		}
	}

	podInfo := []struct {
		description  string
		hasProcMount bool
		pod          func() *api.Pod
	}{
		{
			description:  "has ProcMount",
			hasProcMount: true,
			pod:          podWithProcMount,
		},
		{
			description:  "does not have ProcMount",
			hasProcMount: false,
			pod:          podWithoutProcMount,
		},
		{
			description:  "is nil",
			hasProcMount: false,
			pod:          func() *api.Pod { return nil },
		},
	}

	for _, enabled := range []bool{true, false} {
		for _, oldPodInfo := range podInfo {
			for _, newPodInfo := range podInfo {
				oldPodHasProcMount, oldPod := oldPodInfo.hasProcMount, oldPodInfo.pod()
				newPodHasProcMount, newPod := newPodInfo.hasProcMount, newPodInfo.pod()
				if newPod == nil {
					continue
				}

				t.Run(fmt.Sprintf("feature enabled=%v, old pod %v, new pod %v", enabled, oldPodInfo.description, newPodInfo.description), func(t *testing.T) {
					defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.ProcMountType, enabled)()

					var oldPodSpec *api.PodSpec
					if oldPod != nil {
						oldPodSpec = &oldPod.Spec
					}
					dropDisabledFields(&newPod.Spec, nil, oldPodSpec, nil)

					// old pod should never be changed
					if !reflect.DeepEqual(oldPod, oldPodInfo.pod()) {
						t.Errorf("old pod changed: %v", diff.ObjectReflectDiff(oldPod, oldPodInfo.pod()))
					}

					switch {
					case enabled || oldPodHasProcMount:
						// new pod should not be changed if the feature is enabled, or if the old pod had ProcMount
						if !reflect.DeepEqual(newPod, newPodInfo.pod()) {
							t.Errorf("new pod changed: %v", diff.ObjectReflectDiff(newPod, newPodInfo.pod()))
						}
					case newPodHasProcMount:
						// new pod should be changed
						if reflect.DeepEqual(newPod, newPodInfo.pod()) {
							t.Errorf("new pod was not changed")
						}
						// new pod should not have ProcMount
						if !reflect.DeepEqual(newPod, podWithoutProcMount()) {
							t.Errorf("new pod had ProcMount: %v", diff.ObjectReflectDiff(newPod, podWithoutProcMount()))
						}
					default:
						// new pod should not need to be changed
						if !reflect.DeepEqual(newPod, newPodInfo.pod()) {
							t.Errorf("new pod changed: %v", diff.ObjectReflectDiff(newPod, newPodInfo.pod()))
						}
					}
				})
			}
		}
	}
}

func TestDropPodPriority(t *testing.T) {
	podPriority := int32(1000)
	podWithoutPriority := func() *api.Pod {
		return &api.Pod{
			Spec: api.PodSpec{
				Priority:          nil,
				PriorityClassName: "",
			},
		}
	}
	podWithPriority := func() *api.Pod {
		return &api.Pod{
			Spec: api.PodSpec{
				Priority:          &podPriority,
				PriorityClassName: "",
			},
		}
	}
	podWithPriorityClassOnly := func() *api.Pod {
		return &api.Pod{
			Spec: api.PodSpec{
				Priority:          nil,
				PriorityClassName: "HighPriorityClass",
			},
		}
	}
	podWithBothPriorityFields := func() *api.Pod {
		return &api.Pod{
			Spec: api.PodSpec{
				Priority:          &podPriority,
				PriorityClassName: "HighPriorityClass",
			},
		}
	}
	podInfo := []struct {
		description    string
		hasPodPriority bool
		pod            func() *api.Pod
	}{
		{
			description:    "pod With no PodPriority fields set",
			hasPodPriority: false,
			pod:            podWithoutPriority,
		},
		{
			description:    "feature disabled and pod With PodPriority field set but class name not set",
			hasPodPriority: true,
			pod:            podWithPriority,
		},
		{
			description:    "feature disabled and pod With PodPriority ClassName field set but PortPriority not set",
			hasPodPriority: true,
			pod:            podWithPriorityClassOnly,
		},
		{
			description:    "feature disabled and pod With both PodPriority ClassName and PodPriority fields set",
			hasPodPriority: true,
			pod:            podWithBothPriorityFields,
		},
		{
			description:    "is nil",
			hasPodPriority: false,
			pod:            func() *api.Pod { return nil },
		},
	}

	for _, enabled := range []bool{true, false} {
		for _, oldPodInfo := range podInfo {
			for _, newPodInfo := range podInfo {
				oldPodHasPodPriority, oldPod := oldPodInfo.hasPodPriority, oldPodInfo.pod()
				newPodHasPodPriority, newPod := newPodInfo.hasPodPriority, newPodInfo.pod()
				if newPod == nil {
					continue
				}

				t.Run(fmt.Sprintf("feature enabled=%v, old pod %v, new pod %v", enabled, oldPodInfo.description, newPodInfo.description), func(t *testing.T) {
					defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.PodPriority, enabled)()

					var oldPodSpec *api.PodSpec
					if oldPod != nil {
						oldPodSpec = &oldPod.Spec
					}
					dropDisabledFields(&newPod.Spec, nil, oldPodSpec, nil)

					// old pod should never be changed
					if !reflect.DeepEqual(oldPod, oldPodInfo.pod()) {
						t.Errorf("old pod changed: %v", diff.ObjectReflectDiff(oldPod, oldPodInfo.pod()))
					}

					switch {
					case enabled || oldPodHasPodPriority:
						// new pod should not be changed if the feature is enabled, or if the old pod had PodPriority
						if !reflect.DeepEqual(newPod, newPodInfo.pod()) {
							t.Errorf("new pod changed: %v", diff.ObjectReflectDiff(newPod, newPodInfo.pod()))
						}
					case newPodHasPodPriority:
						// new pod should be changed
						if reflect.DeepEqual(newPod, newPodInfo.pod()) {
							t.Errorf("new pod was not changed")
						}
						// new pod should not have PodPriority
						if !reflect.DeepEqual(newPod, podWithoutPriority()) {
							t.Errorf("new pod had PodPriority: %v", diff.ObjectReflectDiff(newPod, podWithoutPriority()))
						}
					default:
						// new pod should not need to be changed
						if !reflect.DeepEqual(newPod, newPodInfo.pod()) {
							t.Errorf("new pod changed: %v", diff.ObjectReflectDiff(newPod, newPodInfo.pod()))
						}
					}
				})
			}
		}
	}
}

func TestDropEmptyDirSizeLimit(t *testing.T) {
	sizeLimit := resource.MustParse("1Gi")
	podWithEmptyDirSizeLimit := func() *api.Pod {
		return &api.Pod{
			Spec: api.PodSpec{
				RestartPolicy: api.RestartPolicyNever,
				Volumes: []api.Volume{
					{
						Name: "a",
						VolumeSource: api.VolumeSource{
							EmptyDir: &api.EmptyDirVolumeSource{
								Medium:    "memory",
								SizeLimit: &sizeLimit,
							},
						},
					},
				},
			},
		}
	}
	podWithoutEmptyDirSizeLimit := func() *api.Pod {
		return &api.Pod{
			Spec: api.PodSpec{
				RestartPolicy: api.RestartPolicyNever,
				Volumes: []api.Volume{
					{
						Name: "a",
						VolumeSource: api.VolumeSource{
							EmptyDir: &api.EmptyDirVolumeSource{
								Medium: "memory",
							},
						},
					},
				},
			},
		}
	}

	podInfo := []struct {
		description          string
		hasEmptyDirSizeLimit bool
		pod                  func() *api.Pod
	}{
		{
			description:          "has EmptyDir Size Limit",
			hasEmptyDirSizeLimit: true,
			pod:                  podWithEmptyDirSizeLimit,
		},
		{
			description:          "does not have EmptyDir Size Limit",
			hasEmptyDirSizeLimit: false,
			pod:                  podWithoutEmptyDirSizeLimit,
		},
		{
			description:          "is nil",
			hasEmptyDirSizeLimit: false,
			pod:                  func() *api.Pod { return nil },
		},
	}

	for _, enabled := range []bool{true, false} {
		for _, oldPodInfo := range podInfo {
			for _, newPodInfo := range podInfo {
				oldPodHasEmptyDirSizeLimit, oldPod := oldPodInfo.hasEmptyDirSizeLimit, oldPodInfo.pod()
				newPodHasEmptyDirSizeLimit, newPod := newPodInfo.hasEmptyDirSizeLimit, newPodInfo.pod()
				if newPod == nil {
					continue
				}

				t.Run(fmt.Sprintf("feature enabled=%v, old pod %v, new pod %v", enabled, oldPodInfo.description, newPodInfo.description), func(t *testing.T) {
					defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.LocalStorageCapacityIsolation, enabled)()

					var oldPodSpec *api.PodSpec
					if oldPod != nil {
						oldPodSpec = &oldPod.Spec
					}
					dropDisabledFields(&newPod.Spec, nil, oldPodSpec, nil)

					// old pod should never be changed
					if !reflect.DeepEqual(oldPod, oldPodInfo.pod()) {
						t.Errorf("old pod changed: %v", diff.ObjectReflectDiff(oldPod, oldPodInfo.pod()))
					}

					switch {
					case enabled || oldPodHasEmptyDirSizeLimit:
						// new pod should not be changed if the feature is enabled, or if the old pod had EmptyDir SizeLimit
						if !reflect.DeepEqual(newPod, newPodInfo.pod()) {
							t.Errorf("new pod changed: %v", diff.ObjectReflectDiff(newPod, newPodInfo.pod()))
						}
					case newPodHasEmptyDirSizeLimit:
						// new pod should be changed
						if reflect.DeepEqual(newPod, newPodInfo.pod()) {
							t.Errorf("new pod was not changed")
						}
						// new pod should not have EmptyDir SizeLimit
						if !reflect.DeepEqual(newPod, podWithoutEmptyDirSizeLimit()) {
							t.Errorf("new pod had EmptyDir SizeLimit: %v", diff.ObjectReflectDiff(newPod, podWithoutEmptyDirSizeLimit()))
						}
					default:
						// new pod should not need to be changed
						if !reflect.DeepEqual(newPod, newPodInfo.pod()) {
							t.Errorf("new pod changed: %v", diff.ObjectReflectDiff(newPod, newPodInfo.pod()))
						}
					}
				})
			}
		}
	}
}

func TestDropPodShareProcessNamespace(t *testing.T) {
	podWithShareProcessNamespace := func() *api.Pod {
		return &api.Pod{
			Spec: api.PodSpec{
				SecurityContext: &api.PodSecurityContext{
					ShareProcessNamespace: &[]bool{true}[0],
				},
			},
		}
	}
	podWithoutShareProcessNamespace := func() *api.Pod {
		return &api.Pod{
			Spec: api.PodSpec{
				SecurityContext: &api.PodSecurityContext{},
			},
		}
	}
	podWithoutSecurityContext := func() *api.Pod {
		return &api.Pod{
			Spec: api.PodSpec{},
		}
	}

	podInfo := []struct {
		description              string
		hasShareProcessNamespace bool
		pod                      func() *api.Pod
	}{
		{
			description:              "has ShareProcessNamespace",
			hasShareProcessNamespace: true,
			pod:                      podWithShareProcessNamespace,
		},
		{
			description:              "does not have ShareProcessNamespace",
			hasShareProcessNamespace: false,
			pod:                      podWithoutShareProcessNamespace,
		},
		{
			description:              "does not have SecurityContext",
			hasShareProcessNamespace: false,
			pod:                      podWithoutSecurityContext,
		},
		{
			description:              "is nil",
			hasShareProcessNamespace: false,
			pod:                      func() *api.Pod { return nil },
		},
	}

	for _, enabled := range []bool{true, false} {
		for _, oldPodInfo := range podInfo {
			for _, newPodInfo := range podInfo {
				oldPodHasShareProcessNamespace, oldPod := oldPodInfo.hasShareProcessNamespace, oldPodInfo.pod()
				newPodHasShareProcessNamespace, newPod := newPodInfo.hasShareProcessNamespace, newPodInfo.pod()
				if newPod == nil {
					continue
				}

				t.Run(fmt.Sprintf("feature enabled=%v, old pod %v, new pod %v", enabled, oldPodInfo.description, newPodInfo.description), func(t *testing.T) {
					defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.PodShareProcessNamespace, enabled)()

					var oldPodSpec *api.PodSpec
					if oldPod != nil {
						oldPodSpec = &oldPod.Spec
					}
					dropDisabledFields(&newPod.Spec, nil, oldPodSpec, nil)

					// old pod should never be changed
					if !reflect.DeepEqual(oldPod, oldPodInfo.pod()) {
						t.Errorf("old pod changed: %v", diff.ObjectReflectDiff(oldPod, oldPodInfo.pod()))
					}

					switch {
					case enabled || oldPodHasShareProcessNamespace:
						// new pod should not be changed if the feature is enabled, or if the old pod had ShareProcessNamespace set
						if !reflect.DeepEqual(newPod, newPodInfo.pod()) {
							t.Errorf("new pod changed: %v", diff.ObjectReflectDiff(newPod, newPodInfo.pod()))
						}
					case newPodHasShareProcessNamespace:
						// new pod should be changed
						if reflect.DeepEqual(newPod, newPodInfo.pod()) {
							t.Errorf("new pod was not changed")
						}
						// new pod should not have ShareProcessNamespace
						if !reflect.DeepEqual(newPod, podWithoutShareProcessNamespace()) {
							t.Errorf("new pod had ShareProcessNamespace: %v", diff.ObjectReflectDiff(newPod, podWithoutShareProcessNamespace()))
						}
					default:
						// new pod should not need to be changed
						if !reflect.DeepEqual(newPod, newPodInfo.pod()) {
							t.Errorf("new pod changed: %v", diff.ObjectReflectDiff(newPod, newPodInfo.pod()))
						}
					}
				})
			}
		}
	}
}

func TestDropAppArmor(t *testing.T) {
	podWithAppArmor := func() *api.Pod {
		return &api.Pod{
			ObjectMeta: metav1.ObjectMeta{Annotations: map[string]string{"a": "1", apparmor.ContainerAnnotationKeyPrefix + "foo": "default"}},
			Spec:       api.PodSpec{},
		}
	}
	podWithoutAppArmor := func() *api.Pod {
		return &api.Pod{
			ObjectMeta: metav1.ObjectMeta{Annotations: map[string]string{"a": "1"}},
			Spec:       api.PodSpec{},
		}
	}

	podInfo := []struct {
		description string
		hasAppArmor bool
		pod         func() *api.Pod
	}{
		{
			description: "has AppArmor",
			hasAppArmor: true,
			pod:         podWithAppArmor,
		},
		{
			description: "does not have AppArmor",
			hasAppArmor: false,
			pod:         podWithoutAppArmor,
		},
		{
			description: "is nil",
			hasAppArmor: false,
			pod:         func() *api.Pod { return nil },
		},
	}

	for _, enabled := range []bool{true, false} {
		for _, oldPodInfo := range podInfo {
			for _, newPodInfo := range podInfo {
				oldPodHasAppArmor, oldPod := oldPodInfo.hasAppArmor, oldPodInfo.pod()
				newPodHasAppArmor, newPod := newPodInfo.hasAppArmor, newPodInfo.pod()
				if newPod == nil {
					continue
				}

				t.Run(fmt.Sprintf("feature enabled=%v, old pod %v, new pod %v", enabled, oldPodInfo.description, newPodInfo.description), func(t *testing.T) {
					defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.AppArmor, enabled)()

					DropDisabledPodFields(newPod, oldPod)

					// old pod should never be changed
					if !reflect.DeepEqual(oldPod, oldPodInfo.pod()) {
						t.Errorf("old pod changed: %v", diff.ObjectReflectDiff(oldPod, oldPodInfo.pod()))
					}

					switch {
					case enabled || oldPodHasAppArmor:
						// new pod should not be changed if the feature is enabled, or if the old pod had AppArmor
						if !reflect.DeepEqual(newPod, newPodInfo.pod()) {
							t.Errorf("new pod changed: %v", diff.ObjectReflectDiff(newPod, newPodInfo.pod()))
						}
					case newPodHasAppArmor:
						// new pod should be changed
						if reflect.DeepEqual(newPod, newPodInfo.pod()) {
							t.Errorf("new pod was not changed")
						}
						// new pod should not have AppArmor
						if !reflect.DeepEqual(newPod, podWithoutAppArmor()) {
							t.Errorf("new pod had EmptyDir SizeLimit: %v", diff.ObjectReflectDiff(newPod, podWithoutAppArmor()))
						}
					default:
						// new pod should not need to be changed
						if !reflect.DeepEqual(newPod, newPodInfo.pod()) {
							t.Errorf("new pod changed: %v", diff.ObjectReflectDiff(newPod, newPodInfo.pod()))
						}
					}
				})
			}
		}
	}
}

func TestDropTokenRequestProjection(t *testing.T) {
	podWithoutTRProjection := func() *api.Pod {
		return &api.Pod{
			Spec: api.PodSpec{
				Volumes: []api.Volume{{
					VolumeSource: api.VolumeSource{
						Projected: &api.ProjectedVolumeSource{
							Sources: []api.VolumeProjection{{
								ServiceAccountToken: nil,
							}},
						}}},
				},
			},
		}
	}
	podWithoutProjectedVolumeSource := func() *api.Pod {
		return &api.Pod{
			Spec: api.PodSpec{
				Volumes: []api.Volume{
					{VolumeSource: api.VolumeSource{
						ConfigMap: &api.ConfigMapVolumeSource{},
					}},
				},
			},
		}
	}
	podWithTRProjection := func() *api.Pod {
		return &api.Pod{
			Spec: api.PodSpec{
				Volumes: []api.Volume{{
					VolumeSource: api.VolumeSource{
						Projected: &api.ProjectedVolumeSource{
							Sources: []api.VolumeProjection{{
								ServiceAccountToken: &api.ServiceAccountTokenProjection{
									Audience:          "api",
									ExpirationSeconds: 3600,
									Path:              "token",
								}},
							}},
					},
				},
				},
			}}
	}
	podInfo := []struct {
		description     string
		hasTRProjection bool
		pod             func() *api.Pod
	}{
		{
			description:     "has TokenRequestProjection",
			hasTRProjection: true,
			pod:             podWithTRProjection,
		},
		{
			description:     "does not have TokenRequestProjection",
			hasTRProjection: false,
			pod:             podWithoutTRProjection,
		},
		{
			description:     "does not have ProjectedVolumeSource",
			hasTRProjection: false,
			pod:             podWithoutProjectedVolumeSource,
		},
		{
			description:     "is nil",
			hasTRProjection: false,
			pod:             func() *api.Pod { return nil },
		},
	}
	for _, enabled := range []bool{true, false} {
		for _, oldPodInfo := range podInfo {
			for _, newPodInfo := range podInfo {
				oldPodhasTRProjection, oldPod := oldPodInfo.hasTRProjection, oldPodInfo.pod()
				newPodhasTRProjection, newPod := newPodInfo.hasTRProjection, newPodInfo.pod()
				if newPod == nil {
					continue
				}
				t.Run(fmt.Sprintf("feature enabled=%v, old pod %v, new pod %v", enabled, oldPodInfo.description, newPodInfo.description), func(t *testing.T) {
					defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.TokenRequestProjection, enabled)()
					var oldPodSpec *api.PodSpec
					if oldPod != nil {
						oldPodSpec = &oldPod.Spec
					}
					dropDisabledFields(&newPod.Spec, nil, oldPodSpec, nil)
					// old pod should never be changed
					if !reflect.DeepEqual(oldPod, oldPodInfo.pod()) {
						t.Errorf("old pod changed: %v", diff.ObjectReflectDiff(oldPod, oldPodInfo.pod()))
					}
					switch {
					case enabled || oldPodhasTRProjection:
						if !reflect.DeepEqual(newPod, newPodInfo.pod()) {
							t.Errorf("new pod changed: %v", diff.ObjectReflectDiff(newPod, newPodInfo.pod()))
						}
					case newPodhasTRProjection:
						// new pod should be changed
						if reflect.DeepEqual(newPod, newPodInfo.pod()) {
							t.Errorf("%v", oldPod)
							t.Errorf("%v", newPod)
							t.Errorf("new pod was not changed")
						}
						if !reflect.DeepEqual(newPod, podWithoutTRProjection()) {
							t.Errorf("new pod had Tokenrequestprojection: %v", diff.ObjectReflectDiff(newPod, podWithoutTRProjection()))
						}
					default:
						// new pod should not need to be changed
						if !reflect.DeepEqual(newPod, newPodInfo.pod()) {
							t.Errorf("new pod changed: %v", diff.ObjectReflectDiff(newPod, newPodInfo.pod()))
						}
					}
				})
			}
		}
	}
}

func TestDropRunAsGroup(t *testing.T) {
	group := func() *int64 {
		testGroup := int64(1000)
		return &testGroup
	}
	defaultProcMount := api.DefaultProcMount
	defaultSecurityContext := func() *api.SecurityContext {
		return &api.SecurityContext{ProcMount: &defaultProcMount}
	}
	securityContextWithRunAsGroup := func() *api.SecurityContext {
		return &api.SecurityContext{ProcMount: &defaultProcMount, RunAsGroup: group()}
	}
	podWithoutRunAsGroup := func() *api.Pod {
		return &api.Pod{
			Spec: api.PodSpec{
				RestartPolicy:   api.RestartPolicyNever,
				SecurityContext: &api.PodSecurityContext{},
				Containers:      []api.Container{{Name: "container1", Image: "testimage", SecurityContext: defaultSecurityContext()}},
				InitContainers:  []api.Container{{Name: "initContainer1", Image: "testimage", SecurityContext: defaultSecurityContext()}},
			},
		}
	}
	podWithRunAsGroupInPod := func() *api.Pod {
		return &api.Pod{
			Spec: api.PodSpec{
				RestartPolicy:   api.RestartPolicyNever,
				SecurityContext: &api.PodSecurityContext{RunAsGroup: group()},
				Containers:      []api.Container{{Name: "container1", Image: "testimage", SecurityContext: defaultSecurityContext()}},
				InitContainers:  []api.Container{{Name: "initContainer1", Image: "testimage", SecurityContext: defaultSecurityContext()}},
			},
		}
	}
	podWithRunAsGroupInContainers := func() *api.Pod {
		return &api.Pod{
			Spec: api.PodSpec{
				RestartPolicy:   api.RestartPolicyNever,
				SecurityContext: &api.PodSecurityContext{},
				Containers:      []api.Container{{Name: "container1", Image: "testimage", SecurityContext: securityContextWithRunAsGroup()}},
				InitContainers:  []api.Container{{Name: "initContainer1", Image: "testimage", SecurityContext: defaultSecurityContext()}},
			},
		}
	}
	podWithRunAsGroupInInitContainers := func() *api.Pod {
		return &api.Pod{
			Spec: api.PodSpec{
				RestartPolicy:   api.RestartPolicyNever,
				SecurityContext: &api.PodSecurityContext{},
				Containers:      []api.Container{{Name: "container1", Image: "testimage", SecurityContext: defaultSecurityContext()}},
				InitContainers:  []api.Container{{Name: "initContainer1", Image: "testimage", SecurityContext: securityContextWithRunAsGroup()}},
			},
		}
	}

	podInfo := []struct {
		description   string
		hasRunAsGroup bool
		pod           func() *api.Pod
	}{
		{
			description:   "have RunAsGroup in Pod",
			hasRunAsGroup: true,
			pod:           podWithRunAsGroupInPod,
		},
		{
			description:   "have RunAsGroup in Container",
			hasRunAsGroup: true,
			pod:           podWithRunAsGroupInContainers,
		},
		{
			description:   "have RunAsGroup in InitContainer",
			hasRunAsGroup: true,
			pod:           podWithRunAsGroupInInitContainers,
		},
		{
			description:   "does not have RunAsGroup",
			hasRunAsGroup: false,
			pod:           podWithoutRunAsGroup,
		},
		{
			description:   "is nil",
			hasRunAsGroup: false,
			pod:           func() *api.Pod { return nil },
		},
	}

	for _, enabled := range []bool{true, false} {
		for _, oldPodInfo := range podInfo {
			for _, newPodInfo := range podInfo {
				oldPodHasRunAsGroup, oldPod := oldPodInfo.hasRunAsGroup, oldPodInfo.pod()
				newPodHasRunAsGroup, newPod := newPodInfo.hasRunAsGroup, newPodInfo.pod()
				if newPod == nil {
					continue
				}

				t.Run(fmt.Sprintf("feature enabled=%v, old pod %v, new pod %v", enabled, oldPodInfo.description, newPodInfo.description), func(t *testing.T) {
					defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.RunAsGroup, enabled)()

					var oldPodSpec *api.PodSpec
					if oldPod != nil {
						oldPodSpec = &oldPod.Spec
					}
					dropDisabledFields(&newPod.Spec, nil, oldPodSpec, nil)

					// old pod should never be changed
					if !reflect.DeepEqual(oldPod, oldPodInfo.pod()) {
						t.Errorf("old pod changed: %v", diff.ObjectReflectDiff(oldPod, oldPodInfo.pod()))
					}

					switch {
					case enabled || oldPodHasRunAsGroup:
						// new pod should not be changed if the feature is enabled, or if the old pod had RunAsGroup
						if !reflect.DeepEqual(newPod, newPodInfo.pod()) {
							t.Errorf("new pod changed: %v", diff.ObjectReflectDiff(newPod, newPodInfo.pod()))
						}
					case newPodHasRunAsGroup:
						// new pod should be changed
						if reflect.DeepEqual(newPod, newPodInfo.pod()) {
							t.Errorf("%v", oldPod)
							t.Errorf("%v", newPod)
							t.Errorf("new pod was not changed")
						}
						// new pod should not have RunAsGroup
						if !reflect.DeepEqual(newPod, podWithoutRunAsGroup()) {
							t.Errorf("new pod had RunAsGroup: %v", diff.ObjectReflectDiff(newPod, podWithoutRunAsGroup()))
						}
					default:
						// new pod should not need to be changed
						if !reflect.DeepEqual(newPod, newPodInfo.pod()) {
							t.Errorf("new pod changed: %v", diff.ObjectReflectDiff(newPod, newPodInfo.pod()))
						}
					}
				})
			}
		}
	}
}

func TestDropPodSysctls(t *testing.T) {
	podWithSysctls := func() *api.Pod {
		return &api.Pod{
			Spec: api.PodSpec{
				SecurityContext: &api.PodSecurityContext{
					Sysctls: []api.Sysctl{{Name: "test", Value: "value"}},
				},
			},
		}
	}
	podWithoutSysctls := func() *api.Pod {
		return &api.Pod{
			Spec: api.PodSpec{
				SecurityContext: &api.PodSecurityContext{},
			},
		}
	}
	podWithoutSecurityContext := func() *api.Pod {
		return &api.Pod{
			Spec: api.PodSpec{},
		}
	}

	podInfo := []struct {
		description string
		hasSysctls  bool
		pod         func() *api.Pod
	}{
		{
			description: "has Sysctls",
			hasSysctls:  true,
			pod:         podWithSysctls,
		},
		{
			description: "does not have Sysctls",
			hasSysctls:  false,
			pod:         podWithoutSysctls,
		},
		{
			description: "does not have SecurityContext",
			hasSysctls:  false,
			pod:         podWithoutSecurityContext,
		},
		{
			description: "is nil",
			hasSysctls:  false,
			pod:         func() *api.Pod { return nil },
		},
	}

	for _, enabled := range []bool{true, false} {
		for _, oldPodInfo := range podInfo {
			for _, newPodInfo := range podInfo {
				oldPodHasSysctls, oldPod := oldPodInfo.hasSysctls, oldPodInfo.pod()
				newPodHasSysctls, newPod := newPodInfo.hasSysctls, newPodInfo.pod()
				if newPod == nil {
					continue
				}

				t.Run(fmt.Sprintf("feature enabled=%v, old pod %v, new pod %v", enabled, oldPodInfo.description, newPodInfo.description), func(t *testing.T) {
					defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.Sysctls, enabled)()

					var oldPodSpec *api.PodSpec
					if oldPod != nil {
						oldPodSpec = &oldPod.Spec
					}
					dropDisabledFields(&newPod.Spec, nil, oldPodSpec, nil)

					// old pod should never be changed
					if !reflect.DeepEqual(oldPod, oldPodInfo.pod()) {
						t.Errorf("old pod changed: %v", diff.ObjectReflectDiff(oldPod, oldPodInfo.pod()))
					}

					switch {
					case enabled || oldPodHasSysctls:
						// new pod should not be changed if the feature is enabled, or if the old pod had Sysctls set
						if !reflect.DeepEqual(newPod, newPodInfo.pod()) {
							t.Errorf("new pod changed: %v", diff.ObjectReflectDiff(newPod, newPodInfo.pod()))
						}
					case newPodHasSysctls:
						// new pod should be changed
						if reflect.DeepEqual(newPod, newPodInfo.pod()) {
							t.Errorf("new pod was not changed")
						}
						// new pod should not have Sysctls
						if !reflect.DeepEqual(newPod, podWithoutSysctls()) {
							t.Errorf("new pod had Sysctls: %v", diff.ObjectReflectDiff(newPod, podWithoutSysctls()))
						}
					default:
						// new pod should not need to be changed
						if !reflect.DeepEqual(newPod, newPodInfo.pod()) {
							t.Errorf("new pod changed: %v", diff.ObjectReflectDiff(newPod, newPodInfo.pod()))
						}
					}
				})
			}
		}
	}
}

func TestDropSubPathExpr(t *testing.T) {
	podWithSubpaths := func() *api.Pod {
		return &api.Pod{
			Spec: api.PodSpec{
				RestartPolicy:  api.RestartPolicyNever,
				Containers:     []api.Container{{Name: "container1", Image: "testimage", VolumeMounts: []api.VolumeMount{{Name: "a", SubPathExpr: "foo"}, {Name: "a", SubPathExpr: "foo2"}, {Name: "a", SubPathExpr: "foo3"}}}},
				InitContainers: []api.Container{{Name: "container1", Image: "testimage", VolumeMounts: []api.VolumeMount{{Name: "a", SubPathExpr: "foo"}, {Name: "a", SubPathExpr: "foo2"}}}},
				Volumes:        []api.Volume{{Name: "a", VolumeSource: api.VolumeSource{HostPath: &api.HostPathVolumeSource{Path: "/dev/xvdc"}}}},
			},
		}
	}
	podWithoutSubpaths := func() *api.Pod {
		return &api.Pod{
			Spec: api.PodSpec{
				RestartPolicy:  api.RestartPolicyNever,
				Containers:     []api.Container{{Name: "container1", Image: "testimage", VolumeMounts: []api.VolumeMount{{Name: "a", SubPathExpr: ""}, {Name: "a", SubPathExpr: ""}, {Name: "a", SubPathExpr: ""}}}},
				InitContainers: []api.Container{{Name: "container1", Image: "testimage", VolumeMounts: []api.VolumeMount{{Name: "a", SubPathExpr: ""}, {Name: "a", SubPathExpr: ""}}}},
				Volumes:        []api.Volume{{Name: "a", VolumeSource: api.VolumeSource{HostPath: &api.HostPathVolumeSource{Path: "/dev/xvdc"}}}},
			},
		}
	}

	podInfo := []struct {
		description string
		hasSubpaths bool
		pod         func() *api.Pod
	}{
		{
			description: "has subpaths",
			hasSubpaths: true,
			pod:         podWithSubpaths,
		},
		{
			description: "does not have subpaths",
			hasSubpaths: false,
			pod:         podWithoutSubpaths,
		},
		{
			description: "is nil",
			hasSubpaths: false,
			pod:         func() *api.Pod { return nil },
		},
	}

	for _, enabled := range []bool{true, false} {
		for _, oldPodInfo := range podInfo {
			for _, newPodInfo := range podInfo {
				oldPodHasSubpaths, oldPod := oldPodInfo.hasSubpaths, oldPodInfo.pod()
				newPodHasSubpaths, newPod := newPodInfo.hasSubpaths, newPodInfo.pod()
				if newPod == nil {
					continue
				}

				t.Run(fmt.Sprintf("feature enabled=%v, old pod %v, new pod %v", enabled, oldPodInfo.description, newPodInfo.description), func(t *testing.T) {
					defer utilfeaturetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.VolumeSubpathEnvExpansion, enabled)()

					var oldPodSpec *api.PodSpec
					if oldPod != nil {
						oldPodSpec = &oldPod.Spec
					}
					dropDisabledFields(&newPod.Spec, nil, oldPodSpec, nil)

					// old pod should never be changed
					if !reflect.DeepEqual(oldPod, oldPodInfo.pod()) {
						t.Errorf("old pod changed: %v", diff.ObjectReflectDiff(oldPod, oldPodInfo.pod()))
					}

					switch {
					case enabled || oldPodHasSubpaths:
						// new pod should not be changed if the feature is enabled, or if the old pod had subpaths
						if !reflect.DeepEqual(newPod, newPodInfo.pod()) {
							t.Errorf("new pod changed: %v", diff.ObjectReflectDiff(newPod, newPodInfo.pod()))
						}
					case newPodHasSubpaths:
						// new pod should be changed
						if reflect.DeepEqual(newPod, newPodInfo.pod()) {
							t.Errorf("new pod was not changed")
						}
						// new pod should not have subpaths
						if !reflect.DeepEqual(newPod, podWithoutSubpaths()) {
							t.Errorf("new pod had subpaths: %v", diff.ObjectReflectDiff(newPod, podWithoutSubpaths()))
						}
					default:
						// new pod should not need to be changed
						if !reflect.DeepEqual(newPod, newPodInfo.pod()) {
							t.Errorf("new pod changed: %v", diff.ObjectReflectDiff(newPod, newPodInfo.pod()))
						}
					}
				})
			}
		}
	}
}