VolumeMounts: []v1.VolumeMount{{SubPathExpr: "$()"}},
			},
			expectedSubPath:   "$()",
			expectedMountPath: "",
			expectedOk:        false,
		},
		{
			name: "subpaths with nested expandable envs",
			container: &v1.Container{
				VolumeMounts: []v1.VolumeMount{{SubPathExpr: "$(POD_NAME$(ANNOTATION))"}},
			},
			envs: []EnvVar{
				{
					Name:  "POD_NAME",
					Value: "foo",
				},

		volumePlugin, err := asw.volumePluginMgr.FindNodeExpandablePluginBySpec(volumeObj.spec)
		if err != nil || volumePlugin == nil {
			// Log and continue processing
			klog.InfoS("PodExistsInVolume failed to find expandable plugin",
				"volume", volumeObj.volumeName,
				"volumeSpecName", volumeObj.spec.Name())
			return currentSize, false
		}
		if volumePlugin.RequiresFSResize() {
			return currentSize, true
		}
	}

func (pm *VolumePluginMgr) FindExpandablePluginBySpec(spec *Spec) (ExpandableVolumePlugin, error) {
	volumePlugin, err := pm.FindPluginBySpec(spec)
	if err != nil {
		if spec.IsKubeletExpandable() {
			// for kubelet expandable volumes, return a noop plugin that
			// returns success for expand on the controller
			klog.V(4).InfoS("FindExpandablePluginBySpec -> returning noopExpandableVolumePluginInstance", "specName", spec.Name())

		Volume: &v1.Volume{
			Name: volumeName,
		},
	}, nil
}

func (plugin *FakeVolumePlugin) GetDeviceMountRefs(deviceMountPath string) ([]string, error) {
	return []string{}, nil
}

// Expandable volume support
func (plugin *FakeVolumePlugin) ExpandVolumeDevice(spec *volume.Spec, newSize resource.Quantity, oldSize resource.Quantity) (resource.Quantity, error) {
	return resource.Quantity{}, nil
}