/*
Copyright 2015 The Kubernetes Authors.
Copyright 2020 Authors of Arktos - file modified.

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 configmap

import (
	"fmt"
	"io/ioutil"
	"os"
	"path/filepath"
	"reflect"
	"strings"
	"testing"

	"k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/types"
	clientset "k8s.io/client-go/kubernetes"
	"k8s.io/client-go/kubernetes/fake"
	"k8s.io/kubernetes/pkg/volume"
	"k8s.io/kubernetes/pkg/volume/emptydir"
	volumetest "k8s.io/kubernetes/pkg/volume/testing"
	"k8s.io/kubernetes/pkg/volume/util"
)

func TestMakePayload(t *testing.T) {
	caseMappingMode := int32(0400)
	cases := []struct {
		name      string
		mappings  []v1.KeyToPath
		configMap *v1.ConfigMap
		mode      int32
		optional  bool
		payload   map[string]util.FileProjection
		success   bool
	}{
		{
			name: "no overrides",
			configMap: &v1.ConfigMap{
				Data: map[string]string{
					"foo": "foo",
					"bar": "bar",
				},
			},
			mode: 0644,
			payload: map[string]util.FileProjection{
				"foo": {Data: []byte("foo"), Mode: 0644},
				"bar": {Data: []byte("bar"), Mode: 0644},
			},
			success: true,
		},
		{
			name: "no overrides binary data",
			configMap: &v1.ConfigMap{
				BinaryData: map[string][]byte{
					"foo": []byte("foo"),
					"bar": []byte("bar"),
				},
			},
			mode: 0644,
			payload: map[string]util.FileProjection{
				"foo": {Data: []byte("foo"), Mode: 0644},
				"bar": {Data: []byte("bar"), Mode: 0644},
			},
			success: true,
		},
		{
			name: "no overrides mixed data",
			configMap: &v1.ConfigMap{
				BinaryData: map[string][]byte{
					"foo": []byte("foo"),
				},
				Data: map[string]string{
					"bar": "bar",
				},
			},
			mode: 0644,
			payload: map[string]util.FileProjection{
				"foo": {Data: []byte("foo"), Mode: 0644},
				"bar": {Data: []byte("bar"), Mode: 0644},
			},
			success: true,
		},
		{
			name: "basic 1",
			mappings: []v1.KeyToPath{
				{
					Key:  "foo",
					Path: "path/to/foo.txt",
				},
			},
			configMap: &v1.ConfigMap{
				Data: map[string]string{
					"foo": "foo",
					"bar": "bar",
				},
			},
			mode: 0644,
			payload: map[string]util.FileProjection{
				"path/to/foo.txt": {Data: []byte("foo"), Mode: 0644},
			},
			success: true,
		},
		{
			name: "subdirs",
			mappings: []v1.KeyToPath{
				{
					Key:  "foo",
					Path: "path/to/1/2/3/foo.txt",
				},
			},
			configMap: &v1.ConfigMap{
				Data: map[string]string{
					"foo": "foo",
					"bar": "bar",
				},
			},
			mode: 0644,
			payload: map[string]util.FileProjection{
				"path/to/1/2/3/foo.txt": {Data: []byte("foo"), Mode: 0644},
			},
			success: true,
		},
		{
			name: "subdirs 2",
			mappings: []v1.KeyToPath{
				{
					Key:  "foo",
					Path: "path/to/1/2/3/foo.txt",
				},
			},
			configMap: &v1.ConfigMap{
				Data: map[string]string{
					"foo": "foo",
					"bar": "bar",
				},
			},
			mode: 0644,
			payload: map[string]util.FileProjection{
				"path/to/1/2/3/foo.txt": {Data: []byte("foo"), Mode: 0644},
			},
			success: true,
		},
		{
			name: "subdirs 3",
			mappings: []v1.KeyToPath{
				{
					Key:  "foo",
					Path: "path/to/1/2/3/foo.txt",
				},
				{
					Key:  "bar",
					Path: "another/path/to/the/esteemed/bar.bin",
				},
			},
			configMap: &v1.ConfigMap{
				Data: map[string]string{
					"foo": "foo",
					"bar": "bar",
				},
			},
			mode: 0644,
			payload: map[string]util.FileProjection{
				"path/to/1/2/3/foo.txt":                {Data: []byte("foo"), Mode: 0644},
				"another/path/to/the/esteemed/bar.bin": {Data: []byte("bar"), Mode: 0644},
			},
			success: true,
		},
		{
			name: "non existent key",
			mappings: []v1.KeyToPath{
				{
					Key:  "zab",
					Path: "path/to/foo.txt",
				},
			},
			configMap: &v1.ConfigMap{
				Data: map[string]string{
					"foo": "foo",
					"bar": "bar",
				},
			},
			mode:    0644,
			success: false,
		},
		{
			name: "mapping with Mode",
			mappings: []v1.KeyToPath{
				{
					Key:  "foo",
					Path: "foo.txt",
					Mode: &caseMappingMode,
				},
				{
					Key:  "bar",
					Path: "bar.bin",
					Mode: &caseMappingMode,
				},
			},
			configMap: &v1.ConfigMap{
				Data: map[string]string{
					"foo": "foo",
					"bar": "bar",
				},
			},
			mode: 0644,
			payload: map[string]util.FileProjection{
				"foo.txt": {Data: []byte("foo"), Mode: caseMappingMode},
				"bar.bin": {Data: []byte("bar"), Mode: caseMappingMode},
			},
			success: true,
		},
		{
			name: "mapping with defaultMode",
			mappings: []v1.KeyToPath{
				{
					Key:  "foo",
					Path: "foo.txt",
				},
				{
					Key:  "bar",
					Path: "bar.bin",
				},
			},
			configMap: &v1.ConfigMap{
				Data: map[string]string{
					"foo": "foo",
					"bar": "bar",
				},
			},
			mode: 0644,
			payload: map[string]util.FileProjection{
				"foo.txt": {Data: []byte("foo"), Mode: 0644},
				"bar.bin": {Data: []byte("bar"), Mode: 0644},
			},
			success: true,
		},
		{
			name: "optional non existent key",
			mappings: []v1.KeyToPath{
				{
					Key:  "zab",
					Path: "path/to/foo.txt",
				},
			},
			configMap: &v1.ConfigMap{
				Data: map[string]string{
					"foo": "foo",
					"bar": "bar",
				},
			},
			mode:     0644,
			optional: true,
			payload:  map[string]util.FileProjection{},
			success:  true,
		},
	}

	for _, tc := range cases {
		actualPayload, err := MakePayload(tc.mappings, tc.configMap, &tc.mode, tc.optional)
		if err != nil && tc.success {
			t.Errorf("%v: unexpected failure making payload: %v", tc.name, err)
			continue
		}

		if err == nil && !tc.success {
			t.Errorf("%v: unexpected success making payload", tc.name)
			continue
		}

		if !tc.success {
			continue
		}

		if e, a := tc.payload, actualPayload; !reflect.DeepEqual(e, a) {
			t.Errorf("%v: expected and actual payload do not match", tc.name)
		}
	}
}

func newTestHost(t *testing.T, clientset clientset.Interface) (string, volume.VolumeHost) {
	tempDir, err := ioutil.TempDir("/tmp", "configmap_volume_test.")
	if err != nil {
		t.Fatalf("can't make a temp rootdir: %v", err)
	}

	return tempDir, volumetest.NewFakeVolumeHost(tempDir, clientset, emptydir.ProbeVolumePlugins())
}

func TestCanSupport(t *testing.T) {
	pluginMgr := volume.VolumePluginMgr{}
	tempDir, host := newTestHost(t, nil)
	defer os.RemoveAll(tempDir)
	pluginMgr.InitPlugins(ProbeVolumePlugins(), nil /* prober */, host)

	plugin, err := pluginMgr.FindPluginByName(configMapPluginName)
	if err != nil {
		t.Errorf("Can't find the plugin by name")
	}
	if plugin.GetPluginName() != configMapPluginName {
		t.Errorf("Wrong name: %s", plugin.GetPluginName())
	}
	if !plugin.CanSupport(&volume.Spec{Volume: &v1.Volume{VolumeSource: v1.VolumeSource{ConfigMap: &v1.ConfigMapVolumeSource{LocalObjectReference: v1.LocalObjectReference{Name: ""}}}}}) {
		t.Errorf("Expected true")
	}
	if plugin.CanSupport(&volume.Spec{}) {
		t.Errorf("Expected false")
	}
}

func TestPlugin(t *testing.T) {
	var (
		testPodUID     = types.UID("test_pod_uid")
		testVolumeName = "test_volume_name"
		testNamespace  = "test_configmap_namespace"
		testName       = "test_configmap_name"

		volumeSpec    = volumeSpec(testVolumeName, testName, 0644)
		configMap     = configMap(testNamespace, testName)
		client        = fake.NewSimpleClientset(&configMap)
		pluginMgr     = volume.VolumePluginMgr{}
		tempDir, host = newTestHost(t, client)
	)

	defer os.RemoveAll(tempDir)
	pluginMgr.InitPlugins(ProbeVolumePlugins(), nil /* prober */, host)

	plugin, err := pluginMgr.FindPluginByName(configMapPluginName)
	if err != nil {
		t.Errorf("Can't find the plugin by name")
	}

	pod := &v1.Pod{ObjectMeta: metav1.ObjectMeta{Tenant: metav1.TenantSystem, Namespace: testNamespace, UID: testPodUID}}
	mounter, err := plugin.NewMounter(volume.NewSpecFromVolume(volumeSpec), pod, volume.VolumeOptions{})
	if err != nil {
		t.Errorf("Failed to make a new Mounter: %v", err)
	}
	if mounter == nil {
		t.Fatalf("Got a nil Mounter")
	}

	vName, err := plugin.GetVolumeName(volume.NewSpecFromVolume(volumeSpec))
	if err != nil {
		t.Errorf("Failed to GetVolumeName: %v", err)
	}
	if vName != "test_volume_name/test_configmap_name" {
		t.Errorf("Got unexpect VolumeName %v", vName)
	}

	volumePath := mounter.GetPath()
	if !strings.HasSuffix(volumePath, fmt.Sprintf("pods/test_pod_uid/volumes/kubernetes.io~configmap/test_volume_name")) {
		t.Errorf("Got unexpected path: %s", volumePath)
	}

	var mounterArgs volume.MounterArgs
	group := int64(1001)
	mounterArgs.FsGroup = &group
	err = mounter.SetUp(mounterArgs)
	if err != nil {
		t.Errorf("Failed to setup volume: %v", err)
	}
	if _, err := os.Stat(volumePath); err != nil {
		if os.IsNotExist(err) {
			t.Errorf("SetUp() failed, volume path not created: %s", volumePath)
		} else {
			t.Errorf("SetUp() failed: %v", err)
		}
	}

	doTestConfigMapDataInVolume(volumePath, configMap, t)
	doTestCleanAndTeardown(plugin, testPodUID, testVolumeName, volumePath, t)
}

// Test the case where the plugin's ready file exists, but the volume dir is not a
// mountpoint, which is the state the system will be in after reboot.  The dir
// should be mounter and the configMap data written to it.
func TestPluginReboot(t *testing.T) {
	var (
		testPodUID     = types.UID("test_pod_uid3")
		testVolumeName = "test_volume_name"
		testNamespace  = "test_configmap_namespace"
		testName       = "test_configmap_name"

		volumeSpec    = volumeSpec(testVolumeName, testName, 0644)
		configMap     = configMap(testNamespace, testName)
		client        = fake.NewSimpleClientset(&configMap)
		pluginMgr     = volume.VolumePluginMgr{}
		rootDir, host = newTestHost(t, client)
	)

	defer os.RemoveAll(rootDir)
	pluginMgr.InitPlugins(ProbeVolumePlugins(), nil /* prober */, host)

	plugin, err := pluginMgr.FindPluginByName(configMapPluginName)
	if err != nil {
		t.Errorf("Can't find the plugin by name")
	}

	pod := &v1.Pod{ObjectMeta: metav1.ObjectMeta{Tenant: metav1.TenantSystem, Namespace: testNamespace, UID: testPodUID}}
	mounter, err := plugin.NewMounter(volume.NewSpecFromVolume(volumeSpec), pod, volume.VolumeOptions{})
	if err != nil {
		t.Errorf("Failed to make a new Mounter: %v", err)
	}
	if mounter == nil {
		t.Fatalf("Got a nil Mounter")
	}

	podMetadataDir := fmt.Sprintf("%v/pods/test_pod_uid3/plugins/kubernetes.io~configmap/test_volume_name", rootDir)
	util.SetReady(podMetadataDir)
	volumePath := mounter.GetPath()
	if !strings.HasSuffix(volumePath, fmt.Sprintf("pods/test_pod_uid3/volumes/kubernetes.io~configmap/test_volume_name")) {
		t.Errorf("Got unexpected path: %s", volumePath)
	}

	var mounterArgs volume.MounterArgs
	group := int64(1001)
	mounterArgs.FsGroup = &group
	err = mounter.SetUp(mounterArgs)
	if err != nil {
		t.Errorf("Failed to setup volume: %v", err)
	}
	if _, err := os.Stat(volumePath); err != nil {
		if os.IsNotExist(err) {
			t.Errorf("SetUp() failed, volume path not created: %s", volumePath)
		} else {
			t.Errorf("SetUp() failed: %v", err)
		}
	}

	doTestConfigMapDataInVolume(volumePath, configMap, t)
	doTestCleanAndTeardown(plugin, testPodUID, testVolumeName, volumePath, t)
}

func TestPluginOptional(t *testing.T) {
	var (
		testPodUID     = types.UID("test_pod_uid")
		testVolumeName = "test_volume_name"
		testNamespace  = "test_configmap_namespace"
		testName       = "test_configmap_name"
		trueVal        = true

		volumeSpec    = volumeSpec(testVolumeName, testName, 0644)
		client        = fake.NewSimpleClientset()
		pluginMgr     = volume.VolumePluginMgr{}
		tempDir, host = newTestHost(t, client)
	)
	volumeSpec.VolumeSource.ConfigMap.Optional = &trueVal

	defer os.RemoveAll(tempDir)
	pluginMgr.InitPlugins(ProbeVolumePlugins(), nil /* prober */, host)

	plugin, err := pluginMgr.FindPluginByName(configMapPluginName)
	if err != nil {
		t.Errorf("Can't find the plugin by name")
	}

	pod := &v1.Pod{ObjectMeta: metav1.ObjectMeta{Tenant: metav1.TenantSystem, Namespace: testNamespace, UID: testPodUID}}
	mounter, err := plugin.NewMounter(volume.NewSpecFromVolume(volumeSpec), pod, volume.VolumeOptions{})
	if err != nil {
		t.Errorf("Failed to make a new Mounter: %v", err)
	}
	if mounter == nil {
		t.Errorf("Got a nil Mounter")
	}

	vName, err := plugin.GetVolumeName(volume.NewSpecFromVolume(volumeSpec))
	if err != nil {
		t.Errorf("Failed to GetVolumeName: %v", err)
	}
	if vName != "test_volume_name/test_configmap_name" {
		t.Errorf("Got unexpect VolumeName %v", vName)
	}

	volumePath := mounter.GetPath()
	if !strings.HasSuffix(volumePath, fmt.Sprintf("pods/test_pod_uid/volumes/kubernetes.io~configmap/test_volume_name")) {
		t.Errorf("Got unexpected path: %s", volumePath)
	}

	var mounterArgs volume.MounterArgs
	group := int64(1001)
	mounterArgs.FsGroup = &group
	err = mounter.SetUp(mounterArgs)
	if err != nil {
		t.Errorf("Failed to setup volume: %v", err)
	}
	if _, err := os.Stat(volumePath); err != nil {
		if os.IsNotExist(err) {
			t.Errorf("SetUp() failed, volume path not created: %s", volumePath)
		} else {
			t.Errorf("SetUp() failed: %v", err)
		}
	}

	datadirSymlink := filepath.Join(volumePath, "..data")
	datadir, err := os.Readlink(datadirSymlink)
	if err != nil && os.IsNotExist(err) {
		t.Fatalf("couldn't find volume path's data dir, %s", datadirSymlink)
	} else if err != nil {
		t.Fatalf("couldn't read symlink, %s", datadirSymlink)
	}
	datadirPath := filepath.Join(volumePath, datadir)

	infos, err := ioutil.ReadDir(volumePath)
	if err != nil {
		t.Fatalf("couldn't find volume path, %s", volumePath)
	}
	if len(infos) != 0 {
		for _, fi := range infos {
			if fi.Name() != "..data" && fi.Name() != datadir {
				t.Errorf("empty data directory, %s, is not empty. Contains: %s", datadirSymlink, fi.Name())
			}
		}
	}

	infos, err = ioutil.ReadDir(datadirPath)
	if err != nil {
		t.Fatalf("couldn't find volume data path, %s", datadirPath)
	}
	if len(infos) != 0 {
		t.Errorf("empty data directory, %s, is not empty. Contains: %s", datadirSymlink, infos[0].Name())
	}

	doTestCleanAndTeardown(plugin, testPodUID, testVolumeName, volumePath, t)
}

func TestPluginKeysOptional(t *testing.T) {
	var (
		testPodUID     = types.UID("test_pod_uid")
		testVolumeName = "test_volume_name"
		testNamespace  = "test_configmap_namespace"
		testName       = "test_configmap_name"
		trueVal        = true

		volumeSpec    = volumeSpec(testVolumeName, testName, 0644)
		configMap     = configMap(testNamespace, testName)
		client        = fake.NewSimpleClientset(&configMap)
		pluginMgr     = volume.VolumePluginMgr{}
		tempDir, host = newTestHost(t, client)
	)
	volumeSpec.VolumeSource.ConfigMap.Items = []v1.KeyToPath{
		{Key: "data-1", Path: "data-1"},
		{Key: "data-2", Path: "data-2"},
		{Key: "data-3", Path: "data-3"},
		{Key: "missing", Path: "missing"},
	}
	volumeSpec.VolumeSource.ConfigMap.Optional = &trueVal

	defer os.RemoveAll(tempDir)
	pluginMgr.InitPlugins(ProbeVolumePlugins(), nil /* prober */, host)

	plugin, err := pluginMgr.FindPluginByName(configMapPluginName)
	if err != nil {
		t.Errorf("Can't find the plugin by name")
	}

	pod := &v1.Pod{ObjectMeta: metav1.ObjectMeta{Tenant: metav1.TenantSystem, Namespace: testNamespace, UID: testPodUID}}
	mounter, err := plugin.NewMounter(volume.NewSpecFromVolume(volumeSpec), pod, volume.VolumeOptions{})
	if err != nil {
		t.Errorf("Failed to make a new Mounter: %v", err)
	}
	if mounter == nil {
		t.Errorf("Got a nil Mounter")
	}

	vName, err := plugin.GetVolumeName(volume.NewSpecFromVolume(volumeSpec))
	if err != nil {
		t.Errorf("Failed to GetVolumeName: %v", err)
	}
	if vName != "test_volume_name/test_configmap_name" {
		t.Errorf("Got unexpect VolumeName %v", vName)
	}

	volumePath := mounter.GetPath()
	if !strings.HasSuffix(volumePath, fmt.Sprintf("pods/test_pod_uid/volumes/kubernetes.io~configmap/test_volume_name")) {
		t.Errorf("Got unexpected path: %s", volumePath)
	}

	var mounterArgs volume.MounterArgs
	group := int64(1001)
	mounterArgs.FsGroup = &group
	err = mounter.SetUp(mounterArgs)
	if err != nil {
		t.Errorf("Failed to setup volume: %v", err)
	}
	if _, err := os.Stat(volumePath); err != nil {
		if os.IsNotExist(err) {
			t.Errorf("SetUp() failed, volume path not created: %s", volumePath)
		} else {
			t.Errorf("SetUp() failed: %v", err)
		}
	}

	doTestConfigMapDataInVolume(volumePath, configMap, t)
	doTestCleanAndTeardown(plugin, testPodUID, testVolumeName, volumePath, t)
}

func volumeSpec(volumeName, configMapName string, defaultMode int32) *v1.Volume {
	return &v1.Volume{
		Name: volumeName,
		VolumeSource: v1.VolumeSource{
			ConfigMap: &v1.ConfigMapVolumeSource{
				LocalObjectReference: v1.LocalObjectReference{
					Name: configMapName,
				},
				DefaultMode: &defaultMode,
			},
		},
	}
}

func TestInvalidConfigMapSetup(t *testing.T) {
	var (
		testPodUID     = types.UID("test_pod_uid")
		testVolumeName = "test_volume_name"
		testNamespace  = "test_configmap_namespace"
		testName       = "test_configmap_name"

		volumeSpec    = volumeSpec(testVolumeName, testName, 0644)
		configMap     = configMap(testNamespace, testName)
		client        = fake.NewSimpleClientset(&configMap)
		pluginMgr     = volume.VolumePluginMgr{}
		tempDir, host = newTestHost(t, client)
	)
	volumeSpec.VolumeSource.ConfigMap.Items = []v1.KeyToPath{
		{Key: "missing", Path: "missing"},
	}

	defer os.RemoveAll(tempDir)
	pluginMgr.InitPlugins(ProbeVolumePlugins(), nil /* prober */, host)

	plugin, err := pluginMgr.FindPluginByName(configMapPluginName)
	if err != nil {
		t.Errorf("Can't find the plugin by name")
	}

	pod := &v1.Pod{ObjectMeta: metav1.ObjectMeta{Tenant: metav1.TenantSystem, Namespace: testNamespace, UID: testPodUID}}
	mounter, err := plugin.NewMounter(volume.NewSpecFromVolume(volumeSpec), pod, volume.VolumeOptions{})
	if err != nil {
		t.Errorf("Failed to make a new Mounter: %v", err)
	}
	if mounter == nil {
		t.Errorf("Got a nil Mounter")
	}

	vName, err := plugin.GetVolumeName(volume.NewSpecFromVolume(volumeSpec))
	if err != nil {
		t.Errorf("Failed to GetVolumeName: %v", err)
	}
	if vName != "test_volume_name/test_configmap_name" {
		t.Errorf("Got unexpect VolumeName %v", vName)
	}

	volumePath := mounter.GetPath()
	if !strings.HasSuffix(volumePath, fmt.Sprintf("pods/test_pod_uid/volumes/kubernetes.io~configmap/test_volume_name")) {
		t.Errorf("Got unexpected path: %s", volumePath)
	}

	var mounterArgs volume.MounterArgs
	group := int64(1001)
	mounterArgs.FsGroup = &group
	err = mounter.SetUp(mounterArgs)
	if err == nil {
		t.Errorf("Expected setup to fail")
	}
	_, err = os.Stat(volumePath)
	if err == nil {
		t.Errorf("Expected %s to not exist", volumePath)
	}

	doTestCleanAndTeardown(plugin, testPodUID, testVolumeName, volumePath, t)
}

func configMap(namespace, name string) v1.ConfigMap {
	return v1.ConfigMap{
		ObjectMeta: metav1.ObjectMeta{
			Tenant:    metav1.TenantSystem,
			Namespace: namespace,
			Name:      name,
		},
		Data: map[string]string{
			"data-1": "value-1",
			"data-2": "value-2",
			"data-3": "value-3",
		},
	}
}

func doTestConfigMapDataInVolume(volumePath string, configMap v1.ConfigMap, t *testing.T) {
	for key, value := range configMap.Data {
		configMapDataHostPath := filepath.Join(volumePath, key)
		if _, err := os.Stat(configMapDataHostPath); err != nil {
			t.Fatalf("SetUp() failed, couldn't find configMap data on disk: %v", configMapDataHostPath)
		} else {
			actualValue, err := ioutil.ReadFile(configMapDataHostPath)
			if err != nil {
				t.Fatalf("Couldn't read configMap data from: %v", configMapDataHostPath)
			}

			if value != string(actualValue) {
				t.Errorf("Unexpected value; expected %q, got %q", value, actualValue)
			}
		}
	}
}

func doTestCleanAndTeardown(plugin volume.VolumePlugin, podUID types.UID, testVolumeName, volumePath string, t *testing.T) {
	unmounter, err := plugin.NewUnmounter(testVolumeName, podUID)
	if err != nil {
		t.Errorf("Failed to make a new Unmounter: %v", err)
	}
	if unmounter == nil {
		t.Fatalf("Got a nil Unmounter")
	}

	if err := unmounter.TearDown(); err != nil {
		t.Errorf("Expected success, got: %v", err)
	}
	if _, err := os.Stat(volumePath); err == nil {
		t.Errorf("TearDown() failed, volume path still exists: %s", volumePath)
	} else if !os.IsNotExist(err) {
		t.Errorf("TearDown() failed: %v", err)
	}
}
