/*
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 csi

import (
	"context"
	"fmt"
	"io/ioutil"
	"math/rand"
	"os"
	"path/filepath"
	"reflect"
	goruntime "runtime"
	"testing"
	"time"

	"github.com/google/go-cmp/cmp"
	"github.com/stretchr/testify/assert"
	authenticationv1 "k8s.io/api/authentication/v1"
	corev1 "k8s.io/api/core/v1"
	storage "k8s.io/api/storage/v1"
	meta "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/apimachinery/pkg/types"
	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
	utilfeature "k8s.io/apiserver/pkg/util/feature"
	fakeclient "k8s.io/client-go/kubernetes/fake"
	clitesting "k8s.io/client-go/testing"
	featuregatetesting "k8s.io/component-base/featuregate/testing"
	pkgauthenticationv1 "k8s.io/kubernetes/pkg/apis/authentication/v1"
	pkgcorev1 "k8s.io/kubernetes/pkg/apis/core/v1"
	pkgstoragev1 "k8s.io/kubernetes/pkg/apis/storage/v1"
	"k8s.io/kubernetes/pkg/features"
	"k8s.io/kubernetes/pkg/volume"
	fakecsi "k8s.io/kubernetes/pkg/volume/csi/fake"
	"k8s.io/kubernetes/pkg/volume/util"
	volumetypes "k8s.io/kubernetes/pkg/volume/util/types"
)

var (
	testDriver  = "test-driver"
	testVol     = "vol-123"
	testns      = "test-ns"
	testPod     = "test-pod"
	testPodUID  = types.UID("test-pod")
	testAccount = "test-service-account"
)

func prepareVolumeInfoFile(mountPath string, plug *csiPlugin, specVolumeName, volumeID, driverName, lifecycleMode, seLinuxMountContext string) error {
	nodeName := string(plug.host.GetNodeName())
	volData := map[string]string{
		volDataKey.specVolID:           specVolumeName,
		volDataKey.volHandle:           volumeID,
		volDataKey.driverName:          driverName,
		volDataKey.nodeName:            nodeName,
		volDataKey.attachmentID:        getAttachmentName(volumeID, driverName, nodeName),
		volDataKey.volumeLifecycleMode: lifecycleMode,
		volDataKey.seLinuxMountContext: seLinuxMountContext,
	}
	if err := os.MkdirAll(mountPath, 0755); err != nil {
		return fmt.Errorf("failed to create dir for volume info file: %s", err)
	}
	if err := saveVolumeData(mountPath, volDataFileName, volData); err != nil {
		return fmt.Errorf("failed to save volume info file: %s", err)
	}
	return nil
}

func TestMounterGetPath(t *testing.T) {
	plug, tmpDir := newTestPlugin(t, nil)
	defer os.RemoveAll(tmpDir)

	// TODO (vladimirvivien) specName with slashes will not work
	testCases := []struct {
		name           string
		specVolumeName string
		path           string
	}{
		{
			name:           "simple specName",
			specVolumeName: "spec-0",
			path:           filepath.Join(tmpDir, fmt.Sprintf("pods/%s/volumes/kubernetes.io~csi/%s/%s", testPodUID, "spec-0", "/mount")),
		},
		{
			name:           "specName with dots",
			specVolumeName: "test.spec.1",
			path:           filepath.Join(tmpDir, fmt.Sprintf("pods/%s/volumes/kubernetes.io~csi/%s/%s", testPodUID, "test.spec.1", "/mount")),
		},
	}
	for _, tc := range testCases {
		t.Logf("test case: %s", tc.name)
		registerFakePlugin(testDriver, "endpoint", []string{"1.0.0"}, t)
		pv := makeTestPV(tc.specVolumeName, 10, testDriver, testVol)
		spec := volume.NewSpecFromPersistentVolume(pv, pv.Spec.PersistentVolumeSource.CSI.ReadOnly)
		mounter, err := plug.NewMounter(
			spec,
			&corev1.Pod{ObjectMeta: meta.ObjectMeta{UID: testPodUID, Namespace: testns}},
			volume.VolumeOptions{},
		)
		if err != nil {
			t.Fatalf("Failed to make a new Mounter: %v", err)
		}
		csiMounter := mounter.(*csiMountMgr)

		mountPath := csiMounter.GetPath()

		if tc.path != mountPath {
			t.Errorf("expecting path %s, got %s", tc.path, mountPath)
		}
	}
}

func TestMounterSetUp(t *testing.T) {
	tests := []struct {
		name                     string
		driver                   string
		volumeContext            map[string]string
		seLinuxLabel             string
		enableSELinuxFeatureGate bool
		expectedSELinuxContext   string
		expectedVolumeContext    map[string]string
	}{
		{
			name:                  "no pod info",
			driver:                "no-info",
			volumeContext:         nil,
			expectedVolumeContext: nil,
		},
		{
			name:                  "no CSIDriver -> no pod info",
			driver:                "unknown-driver",
			volumeContext:         nil,
			expectedVolumeContext: nil,
		},
		{
			name:                  "CSIDriver with PodInfoRequiredOnMount=nil -> no pod info",
			driver:                "nil",
			volumeContext:         nil,
			expectedVolumeContext: nil,
		},
		{
			name:                  "no pod info -> keep existing volumeContext",
			driver:                "no-info",
			volumeContext:         map[string]string{"foo": "bar"},
			expectedVolumeContext: map[string]string{"foo": "bar"},
		},
		{
			name:                  "add pod info",
			driver:                "info",
			volumeContext:         nil,
			expectedVolumeContext: map[string]string{"csi.storage.k8s.io/pod.uid": "test-pod", "csi.storage.k8s.io/serviceAccount.name": "test-service-account", "csi.storage.k8s.io/pod.name": "test-pod", "csi.storage.k8s.io/pod.namespace": "test-ns", "csi.storage.k8s.io/ephemeral": "false"},
		},
		{
			name:                  "add pod info -> keep existing volumeContext",
			driver:                "info",
			volumeContext:         map[string]string{"foo": "bar"},
			expectedVolumeContext: map[string]string{"foo": "bar", "csi.storage.k8s.io/pod.uid": "test-pod", "csi.storage.k8s.io/serviceAccount.name": "test-service-account", "csi.storage.k8s.io/pod.name": "test-pod", "csi.storage.k8s.io/pod.namespace": "test-ns", "csi.storage.k8s.io/ephemeral": "false"},
		},
		{
			name:                  "CSIInlineVolume pod info",
			driver:                "info",
			volumeContext:         nil,
			expectedVolumeContext: map[string]string{"csi.storage.k8s.io/pod.uid": "test-pod", "csi.storage.k8s.io/serviceAccount.name": "test-service-account", "csi.storage.k8s.io/pod.name": "test-pod", "csi.storage.k8s.io/pod.namespace": "test-ns", "csi.storage.k8s.io/ephemeral": "false"},
		},
		{
			name:                     "should include SELinux mount options, if feature-gate is enabled and driver supports it",
			driver:                   "supports_selinux",
			volumeContext:            nil,
			seLinuxLabel:             "s0,c0",
			expectedSELinuxContext:   "context=\"s0,c0\"",
			enableSELinuxFeatureGate: true,
			expectedVolumeContext:    nil,
		},
		{
			name:                     "should not include selinux mount options, if feature gate is enabled but driver does not support it",
			driver:                   "no_selinux",
			seLinuxLabel:             "s0,c0",
			volumeContext:            nil,
			enableSELinuxFeatureGate: true,
			expectedVolumeContext:    nil,
		},
		{
			name:                     "should not include selinux mount option, if feature gate is enabled but CSIDriver does not exist",
			driver:                   "not_found_selinux",
			seLinuxLabel:             "s0,c0",
			volumeContext:            nil,
			enableSELinuxFeatureGate: true,
			expectedVolumeContext:    nil,
		},
		{
			name:                     "should not include selinux mount options, if feature gate is enabled, driver supports it, but Pod does not have it",
			driver:                   "supports_selinux",
			seLinuxLabel:             "",
			expectedSELinuxContext:   "", // especially make sure the volume plugin does not use -o context="", that is an invalid value
			volumeContext:            nil,
			enableSELinuxFeatureGate: true,
			expectedVolumeContext:    nil,
		},
	}

	noPodMountInfo := false
	currentPodInfoMount := true
	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			defer featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.SELinuxMountReadWriteOncePod, test.enableSELinuxFeatureGate)()

			modes := []storage.VolumeLifecycleMode{
				storage.VolumeLifecyclePersistent,
			}
			fakeClient := fakeclient.NewSimpleClientset(
				getTestCSIDriver("no-info", &noPodMountInfo, nil, modes),
				getTestCSIDriver("info", &currentPodInfoMount, nil, modes),
				getTestCSIDriver("nil", nil, nil, modes),
				getTestCSIDriver("supports_selinux", &noPodMountInfo, nil, modes),
				getTestCSIDriver("no_selinux", &noPodMountInfo, nil, modes),
			)
			plug, tmpDir := newTestPlugin(t, fakeClient)
			defer os.RemoveAll(tmpDir)

			registerFakePlugin(test.driver, "endpoint", []string{"1.0.0"}, t)
			pv := makeTestPV("test-pv", 10, test.driver, testVol)
			pv.Spec.CSI.VolumeAttributes = test.volumeContext
			pv.Spec.MountOptions = []string{"foo=bar", "baz=qux"}
			pvName := pv.GetName()

			mounter, err := plug.NewMounter(
				volume.NewSpecFromPersistentVolume(pv, pv.Spec.PersistentVolumeSource.CSI.ReadOnly),
				&corev1.Pod{
					ObjectMeta: meta.ObjectMeta{UID: testPodUID, Namespace: testns, Name: testPod},
					Spec: corev1.PodSpec{
						ServiceAccountName: testAccount,
					},
				},
				volume.VolumeOptions{},
			)
			if err != nil {
				t.Fatalf("failed to make a new Mounter: %v", err)
			}

			if mounter == nil {
				t.Fatal("failed to create CSI mounter")
			}

			csiMounter := mounter.(*csiMountMgr)
			csiMounter.csiClient = setupClient(t, true)

			attachID := getAttachmentName(csiMounter.volumeID, string(csiMounter.driverName), string(plug.host.GetNodeName()))

			attachment := &storage.VolumeAttachment{
				ObjectMeta: meta.ObjectMeta{
					Name: attachID,
				},
				Spec: storage.VolumeAttachmentSpec{
					NodeName: "test-node",
					Attacher: CSIPluginName,
					Source: storage.VolumeAttachmentSource{
						PersistentVolumeName: &pvName,
					},
				},
				Status: storage.VolumeAttachmentStatus{
					Attached:    false,
					AttachError: nil,
					DetachError: nil,
				},
			}
			_, err = csiMounter.k8s.StorageV1().VolumeAttachments().Create(context.TODO(), attachment, meta.CreateOptions{})
			if err != nil {
				t.Fatalf("failed to setup VolumeAttachment: %v", err)
			}

			// Mounter.SetUp()
			var mounterArgs volume.MounterArgs
			fsGroup := int64(2000)
			mounterArgs.FsGroup = &fsGroup

			if test.seLinuxLabel != "" {
				mounterArgs.SELinuxLabel = test.seLinuxLabel
			}

			expectedMountOptions := pv.Spec.MountOptions

			if test.expectedSELinuxContext != "" {
				expectedMountOptions = append(expectedMountOptions, test.expectedSELinuxContext)
			}

			if err := csiMounter.SetUp(mounterArgs); err != nil {
				t.Fatalf("mounter.Setup failed: %v", err)
			}
			//Test the default value of file system type is not overridden
			if len(csiMounter.spec.PersistentVolume.Spec.CSI.FSType) != 0 {
				t.Errorf("default value of file system type was overridden by type %s", csiMounter.spec.PersistentVolume.Spec.CSI.FSType)
			}

			mountPath := csiMounter.GetPath()
			if _, err := os.Stat(mountPath); err != nil {
				if os.IsNotExist(err) {
					t.Errorf("SetUp() failed, volume path not created: %s", mountPath)
				} else {
					t.Errorf("SetUp() failed: %v", err)
				}
			}

			// ensure call went all the way
			pubs := csiMounter.csiClient.(*fakeCsiDriverClient).nodeClient.GetNodePublishedVolumes()
			vol, ok := pubs[csiMounter.volumeID]
			if !ok {
				t.Error("csi server may not have received NodePublishVolume call")
			}
			if vol.Path != csiMounter.GetPath() {
				t.Errorf("csi server expected path %s, got %s", csiMounter.GetPath(), vol.Path)
			}
			if !reflect.DeepEqual(vol.MountFlags, expectedMountOptions) {
				t.Errorf("csi server expected mount options %v, got %v", expectedMountOptions, vol.MountFlags)
			}
			if !reflect.DeepEqual(vol.VolumeContext, test.expectedVolumeContext) {
				t.Errorf("csi server expected volumeContext %+v, got %+v", test.expectedVolumeContext, vol.VolumeContext)
			}

			// ensure data file is created
			dataDir := filepath.Dir(mounter.GetPath())
			dataFile := filepath.Join(dataDir, volDataFileName)
			if _, err := os.Stat(dataFile); err != nil {
				if os.IsNotExist(err) {
					t.Errorf("data file not created %s", dataFile)
				} else {
					t.Fatal(err)
				}
			}
			data, err := loadVolumeData(dataDir, volDataFileName)
			if err != nil {
				t.Fatal(err)
			}
			if data[volDataKey.specVolID] != csiMounter.spec.Name() {
				t.Error("volume data file unexpected specVolID:", data[volDataKey.specVolID])
			}
			if data[volDataKey.volHandle] != csiMounter.volumeID {
				t.Error("volume data file unexpected volHandle:", data[volDataKey.volHandle])
			}
			if data[volDataKey.driverName] != string(csiMounter.driverName) {
				t.Error("volume data file unexpected driverName:", data[volDataKey.driverName])
			}
			if data[volDataKey.nodeName] != string(csiMounter.plugin.host.GetNodeName()) {
				t.Error("volume data file unexpected nodeName:", data[volDataKey.nodeName])
			}
			if data[volDataKey.volumeLifecycleMode] != string(csiMounter.volumeLifecycleMode) {
				t.Error("volume data file unexpected volumeLifecycleMode:", data[volDataKey.volumeLifecycleMode])
			}

		})
	}
}

func TestMounterSetUpSimple(t *testing.T) {
	fakeClient := fakeclient.NewSimpleClientset()
	plug, tmpDir := newTestPlugin(t, fakeClient)
	defer os.RemoveAll(tmpDir)

	testCases := []struct {
		name                 string
		podUID               types.UID
		mode                 storage.VolumeLifecycleMode
		fsType               string
		options              []string
		spec                 func(string, []string) *volume.Spec
		newMounterShouldFail bool
		setupShouldFail      bool
	}{
		{
			name:            "setup with ephemeral source",
			podUID:          types.UID(fmt.Sprintf("%08X", rand.Uint64())),
			mode:            storage.VolumeLifecycleEphemeral,
			fsType:          "ext4",
			setupShouldFail: true,
			spec: func(fsType string, options []string) *volume.Spec {
				volSrc := makeTestVol("pv1", testDriver)
				volSrc.CSI.FSType = &fsType
				return volume.NewSpecFromVolume(volSrc)
			},
		},
		{
			name:   "setup with persistent source",
			podUID: types.UID(fmt.Sprintf("%08X", rand.Uint64())),
			mode:   storage.VolumeLifecyclePersistent,
			fsType: "zfs",
			spec: func(fsType string, options []string) *volume.Spec {
				pvSrc := makeTestPV("pv1", 20, testDriver, "vol1")
				pvSrc.Spec.CSI.FSType = fsType
				pvSrc.Spec.MountOptions = options
				return volume.NewSpecFromPersistentVolume(pvSrc, false)
			},
		},
		{
			name:   "setup with persistent source without unspecified fstype and options",
			podUID: types.UID(fmt.Sprintf("%08X", rand.Uint64())),
			mode:   storage.VolumeLifecyclePersistent,
			spec: func(fsType string, options []string) *volume.Spec {
				return volume.NewSpecFromPersistentVolume(makeTestPV("pv1", 20, testDriver, "vol2"), false)
			},
		},
		{
			name:                 "setup with missing spec",
			newMounterShouldFail: true,
			spec:                 func(fsType string, options []string) *volume.Spec { return nil },
		},
	}

	for _, tc := range testCases {
		registerFakePlugin(testDriver, "endpoint", []string{"1.0.0"}, t)
		t.Run(tc.name, func(t *testing.T) {
			mounter, err := plug.NewMounter(
				tc.spec(tc.fsType, tc.options),
				&corev1.Pod{ObjectMeta: meta.ObjectMeta{UID: tc.podUID, Namespace: testns}},
				volume.VolumeOptions{},
			)
			if tc.newMounterShouldFail && err != nil {
				t.Log(err)
				return
			}
			if !tc.newMounterShouldFail && err != nil {
				t.Fatal("unexpected error:", err)
			}
			if mounter == nil {
				t.Fatal("failed to create CSI mounter")
			}

			csiMounter := mounter.(*csiMountMgr)
			csiMounter.csiClient = setupClient(t, true)

			if csiMounter.volumeLifecycleMode != tc.mode {
				t.Fatal("unexpected volume mode: ", csiMounter.volumeLifecycleMode)
			}

			attachID := getAttachmentName(csiMounter.volumeID, string(csiMounter.driverName), string(plug.host.GetNodeName()))
			attachment := makeTestAttachment(attachID, "test-node", csiMounter.spec.Name())
			_, err = csiMounter.k8s.StorageV1().VolumeAttachments().Create(context.TODO(), attachment, meta.CreateOptions{})
			if err != nil {
				t.Fatalf("failed to setup VolumeAttachment: %v", err)
			}

			// Mounter.SetUp()
			err = csiMounter.SetUp(volume.MounterArgs{})
			if tc.setupShouldFail && err != nil {
				t.Log(err)
				return
			}
			if !tc.setupShouldFail && err != nil {
				t.Fatal("unexpected error:", err)
			}

			// ensure call went all the way
			pubs := csiMounter.csiClient.(*fakeCsiDriverClient).nodeClient.GetNodePublishedVolumes()
			vol, ok := pubs[csiMounter.volumeID]
			if !ok {
				t.Error("csi server may not have received NodePublishVolume call")
			}
			if vol.VolumeHandle != csiMounter.volumeID {
				t.Error("volumeHandle not sent to CSI driver properly")
			}

			devicePath, err := makeDeviceMountPath(plug, csiMounter.spec)
			if err != nil {
				t.Fatal(err)
			}
			if vol.DeviceMountPath != devicePath {
				t.Errorf("DeviceMountPath not sent properly to CSI driver: %s, %s", vol.DeviceMountPath, devicePath)
			}

			if !reflect.DeepEqual(vol.MountFlags, csiMounter.spec.PersistentVolume.Spec.MountOptions) {
				t.Errorf("unexpected mount flags passed to driver: %+v", vol.MountFlags)
			}

			if vol.FSType != tc.fsType {
				t.Error("unexpected FSType sent to driver:", vol.FSType)
			}

			if vol.Path != csiMounter.GetPath() {
				t.Error("csi server may not have received NodePublishVolume call")
			}

			// ensure data file is created
			dataDir := filepath.Dir(mounter.GetPath())
			dataFile := filepath.Join(dataDir, volDataFileName)
			if _, err := os.Stat(dataFile); err != nil {
				if os.IsNotExist(err) {
					t.Errorf("data file not created %s", dataFile)
				} else {
					t.Fatal(err)
				}
			}
			data, err := loadVolumeData(dataDir, volDataFileName)
			if err != nil {
				t.Fatal(err)
			}
			if data[volDataKey.specVolID] != csiMounter.spec.Name() {
				t.Error("volume data file unexpected specVolID:", data[volDataKey.specVolID])
			}
			if data[volDataKey.volHandle] != csiMounter.volumeID {
				t.Error("volume data file unexpected volHandle:", data[volDataKey.volHandle])
			}
			if data[volDataKey.driverName] != string(csiMounter.driverName) {
				t.Error("volume data file unexpected driverName:", data[volDataKey.driverName])
			}
			if data[volDataKey.nodeName] != string(csiMounter.plugin.host.GetNodeName()) {
				t.Error("volume data file unexpected nodeName:", data[volDataKey.nodeName])
			}
			if data[volDataKey.volumeLifecycleMode] != string(tc.mode) {
				t.Error("volume data file unexpected volumeLifecycleMode:", data[volDataKey.volumeLifecycleMode])
			}
		})
	}
}

func TestMounterSetupWithStatusTracking(t *testing.T) {
	fakeClient := fakeclient.NewSimpleClientset()
	plug, tmpDir := newTestPlugin(t, fakeClient)
	defer os.RemoveAll(tmpDir)
	nonFinalError := volumetypes.NewUncertainProgressError("non-final-error")
	transientError := volumetypes.NewTransientOperationFailure("transient-error")

	testCases := []struct {
		name             string
		podUID           types.UID
		spec             func(string, []string) *volume.Spec
		shouldFail       bool
		exitError        error
		createAttachment bool
	}{
		{
			name:   "setup with correct persistent volume source should result in finish exit status",
			podUID: types.UID(fmt.Sprintf("%08X", rand.Uint64())),
			spec: func(fsType string, options []string) *volume.Spec {
				pvSrc := makeTestPV("pv1", 20, testDriver, "vol1")
				pvSrc.Spec.CSI.FSType = fsType
				pvSrc.Spec.MountOptions = options
				return volume.NewSpecFromPersistentVolume(pvSrc, false)
			},
			createAttachment: true,
		},
		{
			name:   "setup with missing attachment should result in nochange",
			podUID: types.UID(fmt.Sprintf("%08X", rand.Uint64())),
			spec: func(fsType string, options []string) *volume.Spec {
				return volume.NewSpecFromPersistentVolume(makeTestPV("pv3", 20, testDriver, "vol4"), false)
			},
			exitError:        transientError,
			createAttachment: false,
			shouldFail:       true,
		},
		{
			name:   "setup with timeout errors on NodePublish",
			podUID: types.UID(fmt.Sprintf("%08X", rand.Uint64())),
			spec: func(fsType string, options []string) *volume.Spec {
				return volume.NewSpecFromPersistentVolume(makeTestPV("pv4", 20, testDriver, fakecsi.NodePublishTimeOut_VolumeID), false)
			},
			createAttachment: true,
			exitError:        nonFinalError,
			shouldFail:       true,
		},
		{
			name:   "setup with missing secrets should result in nochange exit",
			podUID: types.UID(fmt.Sprintf("%08X", rand.Uint64())),
			spec: func(fsType string, options []string) *volume.Spec {
				pv := makeTestPV("pv5", 20, testDriver, "vol6")
				pv.Spec.PersistentVolumeSource.CSI.NodePublishSecretRef = &corev1.SecretReference{
					Name:      "foo",
					Namespace: "default",
				}
				return volume.NewSpecFromPersistentVolume(pv, false)
			},
			exitError:        transientError,
			createAttachment: true,
			shouldFail:       true,
		},
	}

	for _, tc := range testCases {
		registerFakePlugin(testDriver, "endpoint", []string{"1.0.0"}, t)
		t.Run(tc.name, func(t *testing.T) {
			mounter, err := plug.NewMounter(
				tc.spec("ext4", []string{}),
				&corev1.Pod{ObjectMeta: meta.ObjectMeta{UID: tc.podUID, Namespace: testns}},
				volume.VolumeOptions{},
			)
			if err != nil {
				t.Fatalf("failed to create CSI mounter: %v", err)
			}

			csiMounter := mounter.(*csiMountMgr)
			csiMounter.csiClient = setupClient(t, true)

			if csiMounter.volumeLifecycleMode != storage.VolumeLifecyclePersistent {
				t.Fatal("unexpected volume mode: ", csiMounter.volumeLifecycleMode)
			}

			if tc.createAttachment {
				attachID := getAttachmentName(csiMounter.volumeID, string(csiMounter.driverName), string(plug.host.GetNodeName()))
				attachment := makeTestAttachment(attachID, "test-node", csiMounter.spec.Name())
				_, err = csiMounter.k8s.StorageV1().VolumeAttachments().Create(context.TODO(), attachment, meta.CreateOptions{})
				if err != nil {
					t.Fatalf("failed to setup VolumeAttachment: %v", err)
				}
			}
			err = csiMounter.SetUp(volume.MounterArgs{})

			if tc.exitError != nil && reflect.TypeOf(tc.exitError) != reflect.TypeOf(err) {
				t.Fatalf("expected exitError: %+v got: %+v", tc.exitError, err)
			}

			if tc.shouldFail && err == nil {
				t.Fatalf("expected failure but Setup succeeded")
			}

			if !tc.shouldFail && err != nil {
				t.Fatalf("expected success got mounter.Setup failed with: %v", err)
			}
		})
	}
}

func TestMounterSetUpWithInline(t *testing.T) {
	testCases := []struct {
		name       string
		podUID     types.UID
		mode       storage.VolumeLifecycleMode
		fsType     string
		options    []string
		spec       func(string, []string) *volume.Spec
		shouldFail bool
	}{
		{
			name:   "setup with vol source",
			podUID: types.UID(fmt.Sprintf("%08X", rand.Uint64())),
			mode:   storage.VolumeLifecycleEphemeral,
			fsType: "ext4",
			spec: func(fsType string, options []string) *volume.Spec {
				volSrc := makeTestVol("pv1", testDriver)
				volSrc.CSI.FSType = &fsType
				return volume.NewSpecFromVolume(volSrc)
			},
		},
		{
			name:   "setup with persistent source",
			podUID: types.UID(fmt.Sprintf("%08X", rand.Uint64())),
			mode:   storage.VolumeLifecyclePersistent,
			fsType: "zfs",
			spec: func(fsType string, options []string) *volume.Spec {
				pvSrc := makeTestPV("pv1", 20, testDriver, "vol1")
				pvSrc.Spec.CSI.FSType = fsType
				pvSrc.Spec.MountOptions = options
				return volume.NewSpecFromPersistentVolume(pvSrc, false)
			},
		},
		{
			name:   "setup with persistent source without unspecified fstype and options",
			podUID: types.UID(fmt.Sprintf("%08X", rand.Uint64())),
			mode:   storage.VolumeLifecyclePersistent,
			spec: func(fsType string, options []string) *volume.Spec {
				return volume.NewSpecFromPersistentVolume(makeTestPV("pv1", 20, testDriver, "vol2"), false)
			},
		},
		{
			name:       "setup with missing spec",
			shouldFail: true,
			spec:       func(fsType string, options []string) *volume.Spec { return nil },
		},
	}

	for _, tc := range testCases {
		// The fake driver currently supports all modes.
		volumeLifecycleModes := []storage.VolumeLifecycleMode{
			storage.VolumeLifecycleEphemeral,
			storage.VolumeLifecyclePersistent,
		}
		driver := getTestCSIDriver(testDriver, nil, nil, volumeLifecycleModes)
		fakeClient := fakeclient.NewSimpleClientset(driver)
		plug, tmpDir := newTestPlugin(t, fakeClient)
		defer os.RemoveAll(tmpDir)
		registerFakePlugin(testDriver, "endpoint", []string{"1.0.0"}, t)
		t.Run(tc.name, func(t *testing.T) {
			mounter, err := plug.NewMounter(
				tc.spec(tc.fsType, tc.options),
				&corev1.Pod{ObjectMeta: meta.ObjectMeta{UID: tc.podUID, Namespace: testns}},
				volume.VolumeOptions{},
			)
			if tc.shouldFail && err != nil {
				t.Log(err)
				return
			}
			if !tc.shouldFail && err != nil {
				t.Fatal("unexpected error:", err)
			}
			if mounter == nil {
				t.Fatal("failed to create CSI mounter")
			}

			csiMounter := mounter.(*csiMountMgr)
			csiMounter.csiClient = setupClient(t, true)

			if csiMounter.volumeLifecycleMode != tc.mode {
				t.Fatal("unexpected volume mode: ", csiMounter.volumeLifecycleMode)
			}

			if csiMounter.volumeLifecycleMode == storage.VolumeLifecycleEphemeral && csiMounter.volumeID != makeVolumeHandle(string(tc.podUID), csiMounter.specVolumeID) {
				t.Fatal("unexpected generated volumeHandle:", csiMounter.volumeID)
			}

			if csiMounter.volumeLifecycleMode == storage.VolumeLifecyclePersistent {
				attachID := getAttachmentName(csiMounter.volumeID, string(csiMounter.driverName), string(plug.host.GetNodeName()))
				attachment := makeTestAttachment(attachID, "test-node", csiMounter.spec.Name())
				_, err = csiMounter.k8s.StorageV1().VolumeAttachments().Create(context.TODO(), attachment, meta.CreateOptions{})
				if err != nil {
					t.Fatalf("failed to setup VolumeAttachment: %v", err)
				}
			}

			// Mounter.SetUp()
			if err := csiMounter.SetUp(volume.MounterArgs{}); err != nil {
				t.Fatalf("mounter.Setup failed: %v", err)
			}

			// ensure call went all the way
			pubs := csiMounter.csiClient.(*fakeCsiDriverClient).nodeClient.GetNodePublishedVolumes()
			vol, ok := pubs[csiMounter.volumeID]
			if !ok {
				t.Error("csi server may not have received NodePublishVolume call")
			}
			if vol.VolumeHandle != csiMounter.volumeID {
				t.Error("volumeHandle not sent to CSI driver properly")
			}

			// validate stagingTargetPath
			if tc.mode == storage.VolumeLifecycleEphemeral && vol.DeviceMountPath != "" {
				t.Errorf("unexpected devicePathTarget sent to driver: %s", vol.DeviceMountPath)
			}
			if tc.mode == storage.VolumeLifecyclePersistent {
				devicePath, err := makeDeviceMountPath(plug, csiMounter.spec)
				if err != nil {
					t.Fatal(err)
				}
				if vol.DeviceMountPath != devicePath {
					t.Errorf("DeviceMountPath not sent properly to CSI driver: %s, %s", vol.DeviceMountPath, devicePath)
				}

				if !reflect.DeepEqual(vol.MountFlags, csiMounter.spec.PersistentVolume.Spec.MountOptions) {
					t.Errorf("unexpected mount flags passed to driver: %+v", vol.MountFlags)
				}
			}

			if vol.FSType != tc.fsType {
				t.Error("unexpected FSType sent to driver:", vol.FSType)
			}

			if vol.Path != csiMounter.GetPath() {
				t.Error("csi server may not have received NodePublishVolume call")
			}
		})
	}
}

func TestMounterSetUpWithFSGroup(t *testing.T) {
	fakeClient := fakeclient.NewSimpleClientset()
	plug, tmpDir := newTestPlugin(t, fakeClient)
	defer os.RemoveAll(tmpDir)

	testCases := []struct {
		name                           string
		accessModes                    []corev1.PersistentVolumeAccessMode
		readOnly                       bool
		fsType                         string
		setFsGroup                     bool
		fsGroup                        int64
		driverFSGroupPolicy            bool
		supportMode                    storage.FSGroupPolicy
		driverSupportsVolumeMountGroup bool
		expectedFSGroupInNodePublish   string
	}{
		{
			name: "default fstype, with no fsgroup (should not apply fsgroup)",
			accessModes: []corev1.PersistentVolumeAccessMode{
				corev1.ReadWriteOnce,
			},
			readOnly: false,
			fsType:   "",
		},
		{
			name: "default fstype  with fsgroup (should not apply fsgroup)",
			accessModes: []corev1.PersistentVolumeAccessMode{
				corev1.ReadWriteOnce,
			},
			readOnly:   false,
			fsType:     "",
			setFsGroup: true,
			fsGroup:    3000,
		},
		{
			name: "fstype, fsgroup, RWM, ROM provided (should not apply fsgroup)",
			accessModes: []corev1.PersistentVolumeAccessMode{
				corev1.ReadWriteMany,
				corev1.ReadOnlyMany,
			},
			fsType:     "ext4",
			setFsGroup: true,
			fsGroup:    3000,
		},
		{
			name: "fstype, fsgroup, RWO, but readOnly (should not apply fsgroup)",
			accessModes: []corev1.PersistentVolumeAccessMode{
				corev1.ReadWriteOnce,
			},
			readOnly:   true,
			fsType:     "ext4",
			setFsGroup: true,
			fsGroup:    3000,
		},
		{
			name: "fstype, fsgroup, RWO provided (should apply fsgroup)",
			accessModes: []corev1.PersistentVolumeAccessMode{
				corev1.ReadWriteOnce,
			},
			fsType:     "ext4",
			setFsGroup: true,
			fsGroup:    3000,
		},
		{
			name: "fstype, fsgroup, RWO provided, FSGroupPolicy ReadWriteOnceWithFSType (should apply fsgroup)",
			accessModes: []corev1.PersistentVolumeAccessMode{
				corev1.ReadWriteOnce,
			},
			fsType:              "ext4",
			setFsGroup:          true,
			fsGroup:             3000,
			driverFSGroupPolicy: true,
			supportMode:         storage.ReadWriteOnceWithFSTypeFSGroupPolicy,
		},
		{
			name: "default fstype with no fsgroup, FSGroupPolicy ReadWriteOnceWithFSType (should not apply fsgroup)",
			accessModes: []corev1.PersistentVolumeAccessMode{
				corev1.ReadWriteOnce,
			},
			readOnly:            false,
			fsType:              "",
			driverFSGroupPolicy: true,
			supportMode:         storage.ReadWriteOnceWithFSTypeFSGroupPolicy,
		},
		{
			name: "default fstype with fsgroup, FSGroupPolicy ReadWriteOnceWithFSType (should not apply fsgroup)",
			accessModes: []corev1.PersistentVolumeAccessMode{
				corev1.ReadWriteOnce,
			},
			readOnly:            false,
			fsType:              "",
			setFsGroup:          true,
			fsGroup:             3000,
			driverFSGroupPolicy: true,
			supportMode:         storage.ReadWriteOnceWithFSTypeFSGroupPolicy,
		},
		{
			name: "fstype, fsgroup, RWO provided, readonly, FSGroupPolicy ReadWriteOnceWithFSType (should not apply fsgroup)",
			accessModes: []corev1.PersistentVolumeAccessMode{
				corev1.ReadWriteOnce,
			},
			readOnly:            true,
			fsType:              "ext4",
			setFsGroup:          true,
			fsGroup:             3000,
			driverFSGroupPolicy: true,
			supportMode:         storage.ReadWriteOnceWithFSTypeFSGroupPolicy,
		},
		{
			name: "fstype, fsgroup, RWX provided, FSGroupPolicy ReadWriteOnceWithFSType (should not apply fsgroup)",
			accessModes: []corev1.PersistentVolumeAccessMode{
				corev1.ReadWriteMany,
			},
			readOnly:            false,
			fsType:              "ext4",
			setFsGroup:          true,
			fsGroup:             3000,
			driverFSGroupPolicy: true,
			supportMode:         storage.ReadWriteOnceWithFSTypeFSGroupPolicy,
		},
		{
			name: "fstype, fsgroup, RWO provided, FSGroupPolicy None (should not apply fsgroup)",
			accessModes: []corev1.PersistentVolumeAccessMode{
				corev1.ReadWriteOnce,
			},
			fsType:              "ext4",
			setFsGroup:          true,
			fsGroup:             3000,
			driverFSGroupPolicy: true,
			supportMode:         storage.NoneFSGroupPolicy,
		},
		{
			name: "fstype, fsgroup, RWO provided, readOnly, FSGroupPolicy File (should apply fsgroup)",
			accessModes: []corev1.PersistentVolumeAccessMode{
				corev1.ReadWriteOnce,
			},
			readOnly:            true,
			fsType:              "ext4",
			setFsGroup:          true,
			fsGroup:             3000,
			driverFSGroupPolicy: true,
			supportMode:         storage.FileFSGroupPolicy,
		},
		{
			name:                           "fsgroup provided, driver supports volume mount group; expect fsgroup to be passed to NodePublishVolume",
			fsType:                         "ext4",
			setFsGroup:                     true,
			fsGroup:                        3000,
			driverSupportsVolumeMountGroup: true,
			expectedFSGroupInNodePublish:   "3000",
		},
		{
			name:                           "fsgroup not provided, driver supports volume mount group; expect fsgroup not to be passed to NodePublishVolume",
			fsType:                         "ext4",
			setFsGroup:                     false,
			driverSupportsVolumeMountGroup: true,
			expectedFSGroupInNodePublish:   "",
		},
		{
			name:                           "fsgroup provided, driver does not support volume mount group; expect fsgroup not to be passed to NodePublishVolume",
			fsType:                         "ext4",
			setFsGroup:                     true,
			fsGroup:                        3000,
			driverSupportsVolumeMountGroup: false,
			expectedFSGroupInNodePublish:   "",
		},
	}

	for i, tc := range testCases {
		t.Logf("Running test %s", tc.name)

		volName := fmt.Sprintf("test-vol-%d", i)
		registerFakePlugin(testDriver, "endpoint", []string{"1.0.0"}, t)
		pv := makeTestPV("test-pv", 10, testDriver, volName)
		pv.Spec.AccessModes = tc.accessModes
		pvName := pv.GetName()

		spec := volume.NewSpecFromPersistentVolume(pv, tc.readOnly)

		if tc.fsType != "" {
			spec.PersistentVolume.Spec.CSI.FSType = tc.fsType
		}

		mounter, err := plug.NewMounter(
			spec,
			&corev1.Pod{ObjectMeta: meta.ObjectMeta{UID: testPodUID, Namespace: testns}},
			volume.VolumeOptions{},
		)
		if err != nil {
			t.Fatalf("Failed to make a new Mounter: %v", err)
		}

		if mounter == nil {
			t.Fatal("failed to create CSI mounter")
		}

		csiMounter := mounter.(*csiMountMgr)
		csiMounter.csiClient = setupClientWithVolumeMountGroup(t, true /* stageUnstageSet */, tc.driverSupportsVolumeMountGroup)

		attachID := getAttachmentName(csiMounter.volumeID, string(csiMounter.driverName), string(plug.host.GetNodeName()))
		attachment := makeTestAttachment(attachID, "test-node", pvName)

		_, err = csiMounter.k8s.StorageV1().VolumeAttachments().Create(context.TODO(), attachment, meta.CreateOptions{})
		if err != nil {
			t.Errorf("failed to setup VolumeAttachment: %v", err)
			continue
		}

		// Mounter.SetUp()
		var mounterArgs volume.MounterArgs
		var fsGroupPtr *int64
		if tc.setFsGroup {
			fsGroup := tc.fsGroup
			fsGroupPtr = &fsGroup
		}
		mounterArgs.FsGroup = fsGroupPtr
		if err := csiMounter.SetUp(mounterArgs); err != nil {
			t.Fatalf("mounter.Setup failed: %v", err)
		}

		//Test the default value of file system type is not overridden
		if len(csiMounter.spec.PersistentVolume.Spec.CSI.FSType) != len(tc.fsType) {
			t.Errorf("file system type was overridden by type %s", csiMounter.spec.PersistentVolume.Spec.CSI.FSType)
		}

		// ensure call went all the way
		pubs := csiMounter.csiClient.(*fakeCsiDriverClient).nodeClient.GetNodePublishedVolumes()
		if pubs[csiMounter.volumeID].Path != csiMounter.GetPath() {
			t.Error("csi server may not have received NodePublishVolume call")
		}
		if pubs[csiMounter.volumeID].VolumeMountGroup != tc.expectedFSGroupInNodePublish {
			t.Errorf("expected VolumeMountGroup parameter in NodePublishVolumeRequest to be %q, got: %q", tc.expectedFSGroupInNodePublish, pubs[csiMounter.volumeID].VolumeMountGroup)
		}
	}
}

func TestUnmounterTeardown(t *testing.T) {
	plug, tmpDir := newTestPlugin(t, nil)
	defer os.RemoveAll(tmpDir)
	registerFakePlugin(testDriver, "endpoint", []string{"1.0.0"}, t)
	pv := makeTestPV("test-pv", 10, testDriver, testVol)

	// save the data file prior to unmount
	targetDir := getTargetPath(testPodUID, pv.ObjectMeta.Name, plug.host)
	dir := filepath.Join(targetDir, "mount")
	if err := os.MkdirAll(dir, 0755); err != nil && !os.IsNotExist(err) {
		t.Errorf("failed to create dir [%s]: %v", dir, err)
	}

	// do a fake local mount
	diskMounter := util.NewSafeFormatAndMountFromHost(plug.GetPluginName(), plug.host)
	device := "/fake/device"
	if goruntime.GOOS == "windows" {
		// We need disk numbers on Windows.
		device = "1"
	}
	if err := diskMounter.FormatAndMount(device, dir, "testfs", nil); err != nil {
		t.Errorf("failed to mount dir [%s]: %v", dir, err)
	}

	if err := saveVolumeData(
		targetDir,
		volDataFileName,
		map[string]string{
			volDataKey.specVolID:  pv.ObjectMeta.Name,
			volDataKey.driverName: testDriver,
			volDataKey.volHandle:  testVol,
		},
	); err != nil {
		t.Fatalf("failed to save volume data: %v", err)
	}

	unmounter, err := plug.NewUnmounter(pv.ObjectMeta.Name, testPodUID)
	if err != nil {
		t.Fatalf("failed to make a new Unmounter: %v", err)
	}

	csiUnmounter := unmounter.(*csiMountMgr)
	csiUnmounter.csiClient = setupClient(t, true)
	err = csiUnmounter.TearDownAt(dir)
	if err != nil {
		t.Fatal(err)
	}

	// ensure csi client call
	pubs := csiUnmounter.csiClient.(*fakeCsiDriverClient).nodeClient.GetNodePublishedVolumes()
	if _, ok := pubs[csiUnmounter.volumeID]; ok {
		t.Error("csi server may not have received NodeUnpublishVolume call")
	}

}

func TestIsCorruptedDir(t *testing.T) {
	existingMountPath, err := ioutil.TempDir(os.TempDir(), "blobfuse-csi-mount-test")
	if err != nil {
		t.Fatalf("failed to create tmp dir: %v", err)
	}
	defer os.RemoveAll(existingMountPath)

	tests := []struct {
		desc           string
		dir            string
		expectedResult bool
	}{
		{
			desc:           "NotExist dir",
			dir:            "/tmp/NotExist",
			expectedResult: false,
		},
		{
			desc:           "Existing dir",
			dir:            existingMountPath,
			expectedResult: false,
		},
	}

	for i, test := range tests {
		isCorruptedDir := isCorruptedDir(test.dir)
		assert.Equal(t, test.expectedResult, isCorruptedDir, "TestCase[%d]: %s", i, test.desc)
	}
}

func TestPodServiceAccountTokenAttrs(t *testing.T) {
	scheme := runtime.NewScheme()
	utilruntime.Must(pkgauthenticationv1.RegisterDefaults(scheme))
	utilruntime.Must(pkgstoragev1.RegisterDefaults(scheme))
	utilruntime.Must(pkgcorev1.RegisterDefaults(scheme))

	gcp := "gcp"

	tests := []struct {
		desc              string
		driver            *storage.CSIDriver
		volumeContext     map[string]string
		wantVolumeContext map[string]string
	}{
		{
			desc: "csi driver has no ServiceAccountToken",
			driver: &storage.CSIDriver{
				ObjectMeta: meta.ObjectMeta{
					Name: testDriver,
				},
				Spec: storage.CSIDriverSpec{},
			},
			wantVolumeContext: nil,
		},
		{
			desc: "one token with empty string as audience",
			driver: &storage.CSIDriver{
				ObjectMeta: meta.ObjectMeta{
					Name: testDriver,
				},
				Spec: storage.CSIDriverSpec{
					TokenRequests: []storage.TokenRequest{
						{
							Audience: "",
						},
					},
				},
			},
			wantVolumeContext: map[string]string{"csi.storage.k8s.io/serviceAccount.tokens": `{"":{"token":"test-ns:test-service-account:3600:[api]","expirationTimestamp":"1970-01-01T00:00:01Z"}}`},
		},
		{
			desc: "one token with non-empty string as audience",
			driver: &storage.CSIDriver{
				ObjectMeta: meta.ObjectMeta{
					Name: testDriver,
				},
				Spec: storage.CSIDriverSpec{
					TokenRequests: []storage.TokenRequest{
						{
							Audience: gcp,
						},
					},
				},
			},
			wantVolumeContext: map[string]string{"csi.storage.k8s.io/serviceAccount.tokens": `{"gcp":{"token":"test-ns:test-service-account:3600:[gcp]","expirationTimestamp":"1970-01-01T00:00:01Z"}}`},
		},
	}

	for _, test := range tests {
		t.Run(test.desc, func(t *testing.T) {
			registerFakePlugin(testDriver, "endpoint", []string{"1.0.0"}, t)
			client := fakeclient.NewSimpleClientset()
			if test.driver != nil {
				test.driver.Spec.VolumeLifecycleModes = []storage.VolumeLifecycleMode{
					storage.VolumeLifecycleEphemeral,
					storage.VolumeLifecyclePersistent,
				}
				scheme.Default(test.driver)
				client = fakeclient.NewSimpleClientset(test.driver)
			}
			client.PrependReactor("create", "serviceaccounts", clitesting.ReactionFunc(func(action clitesting.Action) (bool, runtime.Object, error) {
				tr := action.(clitesting.CreateAction).GetObject().(*authenticationv1.TokenRequest)
				scheme.Default(tr)
				if len(tr.Spec.Audiences) == 0 {
					tr.Spec.Audiences = []string{"api"}
				}
				tr.Status.Token = fmt.Sprintf("%v:%v:%d:%v", action.GetNamespace(), testAccount, *tr.Spec.ExpirationSeconds, tr.Spec.Audiences)
				tr.Status.ExpirationTimestamp = meta.NewTime(time.Unix(1, 1))
				return true, tr, nil
			}))
			plug, tmpDir := newTestPlugin(t, client)
			defer os.RemoveAll(tmpDir)
			mounter, err := plug.NewMounter(
				volume.NewSpecFromVolume(makeTestVol("test", testDriver)),
				&corev1.Pod{
					ObjectMeta: meta.ObjectMeta{UID: testPodUID, Namespace: testns, Name: testPod},
					Spec: corev1.PodSpec{
						ServiceAccountName: testAccount,
					},
				},
				volume.VolumeOptions{},
			)
			if err != nil {
				t.Fatalf("Failed to create a csi mounter, err: %v", err)
			}

			csiMounter := mounter.(*csiMountMgr)
			csiMounter.csiClient = setupClient(t, false)
			if err := csiMounter.SetUp(volume.MounterArgs{}); err != nil {
				t.Fatalf("mounter.Setup failed: %v", err)
			}

			pubs := csiMounter.csiClient.(*fakeCsiDriverClient).nodeClient.GetNodePublishedVolumes()
			vol, ok := pubs[csiMounter.volumeID]
			if !ok {
				t.Error("csi server may not have received NodePublishVolume call")
			}
			if vol.Path != csiMounter.GetPath() {
				t.Errorf("csi server expected path %s, got %s", csiMounter.GetPath(), vol.Path)
			}
			if diff := cmp.Diff(test.wantVolumeContext, vol.VolumeContext); diff != "" {
				t.Errorf("podServiceAccountTokenAttrs() = diff (-want +got):\n%s", diff)
			}
		})
	}
}

func Test_csiMountMgr_supportsFSGroup(t *testing.T) {
	type fields struct {
		plugin              *csiPlugin
		driverName          csiDriverName
		volumeLifecycleMode storage.VolumeLifecycleMode
		volumeID            string
		specVolumeID        string
		readOnly            bool
		supportsSELinux     bool
		spec                *volume.Spec
		pod                 *corev1.Pod
		podUID              types.UID
		publishContext      map[string]string
		kubeVolHost         volume.KubeletVolumeHost
		MetricsProvider     volume.MetricsProvider
	}
	type args struct {
		fsType       string
		fsGroup      *int64
		driverPolicy storage.FSGroupPolicy
	}
	tests := []struct {
		name   string
		fields fields
		args   args
		want   bool
	}{
		{
			name: "empty all",
			args: args{},
			want: false,
		},
		{
			name: "driverPolicy is FileFSGroupPolicy",
			args: args{
				fsGroup:      new(int64),
				driverPolicy: storage.FileFSGroupPolicy,
			},
			want: true,
		},
		{
			name: "driverPolicy is ReadWriteOnceWithFSTypeFSGroupPolicy",
			args: args{
				fsGroup:      new(int64),
				driverPolicy: storage.ReadWriteOnceWithFSTypeFSGroupPolicy,
			},
			want: false,
		},
		{
			name: "driverPolicy is ReadWriteOnceWithFSTypeFSGroupPolicy with empty Spec",
			args: args{
				fsGroup:      new(int64),
				fsType:       "ext4",
				driverPolicy: storage.ReadWriteOnceWithFSTypeFSGroupPolicy,
			},
			fields: fields{
				spec: &volume.Spec{},
			},
			want: false,
		},
		{
			name: "driverPolicy is ReadWriteOnceWithFSTypeFSGroupPolicy with empty PersistentVolume",
			args: args{
				fsGroup:      new(int64),
				fsType:       "ext4",
				driverPolicy: storage.ReadWriteOnceWithFSTypeFSGroupPolicy,
			},
			fields: fields{
				spec: volume.NewSpecFromPersistentVolume(&corev1.PersistentVolume{}, true),
			},
			want: false,
		},
		{
			name: "driverPolicy is ReadWriteOnceWithFSTypeFSGroupPolicy with empty AccessModes",
			args: args{
				fsGroup:      new(int64),
				fsType:       "ext4",
				driverPolicy: storage.ReadWriteOnceWithFSTypeFSGroupPolicy,
			},
			fields: fields{
				spec: volume.NewSpecFromPersistentVolume(&corev1.PersistentVolume{
					Spec: corev1.PersistentVolumeSpec{
						AccessModes: []corev1.PersistentVolumeAccessMode{},
					},
				}, true),
			},
			want: false,
		},
		{
			name: "driverPolicy is ReadWriteOnceWithFSTypeFSGroupPolicy with ReadWriteOnce AccessModes",
			args: args{
				fsGroup:      new(int64),
				fsType:       "ext4",
				driverPolicy: storage.ReadWriteOnceWithFSTypeFSGroupPolicy,
			},
			fields: fields{
				spec: volume.NewSpecFromPersistentVolume(&corev1.PersistentVolume{
					Spec: corev1.PersistentVolumeSpec{
						AccessModes: []corev1.PersistentVolumeAccessMode{corev1.ReadWriteOnce},
					},
				}, true),
			},
			want: true,
		},
		{
			name: "driverPolicy is ReadWriteOnceWithFSTypeFSGroupPolicy with CSI inline volume",
			args: args{
				fsGroup:      new(int64),
				fsType:       "ext4",
				driverPolicy: storage.ReadWriteOnceWithFSTypeFSGroupPolicy,
			},
			fields: fields{
				spec: volume.NewSpecFromVolume(&corev1.Volume{
					VolumeSource: corev1.VolumeSource{
						CSI: &corev1.CSIVolumeSource{
							Driver: testDriver,
						},
					},
				}),
			},
			want: true,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			c := &csiMountMgr{
				plugin:              tt.fields.plugin,
				driverName:          tt.fields.driverName,
				volumeLifecycleMode: tt.fields.volumeLifecycleMode,
				volumeID:            tt.fields.volumeID,
				specVolumeID:        tt.fields.specVolumeID,
				readOnly:            tt.fields.readOnly,
				needSELinuxRelabel:  tt.fields.supportsSELinux,
				spec:                tt.fields.spec,
				pod:                 tt.fields.pod,
				podUID:              tt.fields.podUID,
				publishContext:      tt.fields.publishContext,
				kubeVolHost:         tt.fields.kubeVolHost,
				MetricsProvider:     tt.fields.MetricsProvider,
			}
			if got := c.supportsFSGroup(tt.args.fsType, tt.args.fsGroup, tt.args.driverPolicy); got != tt.want {
				t.Errorf("supportsFSGroup() = %v, want %v", got, tt.want)
			}
		})
	}
}

func TestMounterGetFSGroupPolicy(t *testing.T) {
	defaultPolicy := storage.ReadWriteOnceWithFSTypeFSGroupPolicy
	testCases := []struct {
		name                  string
		defined               bool
		expectedFSGroupPolicy storage.FSGroupPolicy
	}{
		{
			name:                  "no FSGroupPolicy defined, expect default",
			defined:               false,
			expectedFSGroupPolicy: storage.ReadWriteOnceWithFSTypeFSGroupPolicy,
		},
		{
			name:                  "File FSGroupPolicy defined, expect File",
			defined:               true,
			expectedFSGroupPolicy: storage.FileFSGroupPolicy,
		},
		{
			name:                  "None FSGroupPolicy defined, expected None",
			defined:               true,
			expectedFSGroupPolicy: storage.NoneFSGroupPolicy,
		},
	}
	for _, tc := range testCases {
		t.Logf("testing: %s", tc.name)
		// Define the driver and set the FSGroupPolicy
		driver := getTestCSIDriver(testDriver, nil, nil, nil)
		if tc.defined {
			driver.Spec.FSGroupPolicy = &tc.expectedFSGroupPolicy
		} else {
			driver.Spec.FSGroupPolicy = &defaultPolicy
		}

		// Create the client and register the resources
		fakeClient := fakeclient.NewSimpleClientset(driver)
		plug, tmpDir := newTestPlugin(t, fakeClient)
		defer os.RemoveAll(tmpDir)
		registerFakePlugin(testDriver, "endpoint", []string{"1.3.0"}, t)

		mounter, err := plug.NewMounter(
			volume.NewSpecFromPersistentVolume(makeTestPV("test.vol.id", 20, testDriver, "testvol-handle1"), true),
			&corev1.Pod{ObjectMeta: meta.ObjectMeta{UID: "1", Namespace: testns}},
			volume.VolumeOptions{},
		)
		if err != nil {
			t.Fatalf("Error creating a new mounter: %s", err)
		}

		csiMounter := mounter.(*csiMountMgr)

		// Check to see if we can obtain the CSIDriver, along with examining its FSGroupPolicy
		fsGroup, err := csiMounter.getFSGroupPolicy()
		if err != nil {
			t.Fatalf("Error attempting to obtain FSGroupPolicy: %v", err)
		}
		if fsGroup != *driver.Spec.FSGroupPolicy {
			t.Fatalf("FSGroupPolicy doesn't match expected value: %v, %v", fsGroup, tc.expectedFSGroupPolicy)
		}
	}
}
