}
	_, _, wwid, err := getWwnsLunWwids(fc)
	// if no wwn and lun, exit
	if len(wwid) == 0 || err != nil {
		t.Errorf("no fc disk found")
	}
}

func Test_getWwnsLunWwidsError(t *testing.T) {
	fc := &v1.FCVolumeSource{
		FSType: "ext4",
	}
	wwn, lun, wwid, err := getWwnsLunWwids(fc)
	// expected no wwn and lun and wwid
	if (len(wwn) != 0 && lun != "" && len(wwid) != 0) || err == nil {

	return ioutil.WriteFile(filename, data, perm)
}

// given a wwn and lun, find the device and associated devicemapper parent
func findDisk(wwn, lun string, io ioHandler, deviceUtil volumeutil.DeviceUtil) (string, string) {
	fcPathExp := "^(pci-.*-fc|fc)-0x" + wwn + "-lun-" + lun + "$"
	r := regexp.MustCompile(fcPathExp)
	devPath := byPath
	if dirs, err := io.ReadDir(devPath); err == nil {

			if test.expectError && err == nil {
				t.Errorf("expected error but got none")
			}
			if !test.expectError && err != nil {
				t.Errorf("got unexpected error: %s", err)
			}
			// if no disk matches input wwn and lun, exit
			if devicePath == "" && !test.expectError {
				t.Errorf("no fc disk found")
			}
			if devicePath != test.disk {
				t.Errorf("matching wrong disk, expected: %s, actual: %s", test.disk, devicePath)

	// Retrieve globalPDPath from globalMapPathUUID
	// globalMapPathUUID examples:
	//   wwn+lun: plugins/kubernetes.io/fc/volumeDevices/50060e801049cfd1-lun-0/{pod uuid}
	//   wwid: plugins/kubernetes.io/fc/volumeDevices/3600508b400105e210000900000490000/{pod uuid}
	globalPDPath := filepath.Dir(globalMapPathUUID)
	// Create volume from wwn+lun or wwid
	wwns, lun, wwids, err := parsePDName(globalPDPath)
	if err != nil {

			}},
		}, {
			name: "FC valid targetWWNs and empty lun",
			vol: core.Volume{
				Name: "fc",
				VolumeSource: core.VolumeSource{
					FC: &core.FCVolumeSource{
						TargetWWNs: []string{"wwn"},
						Lun:        nil,
						FSType:     "ext4",
						ReadOnly:   false,
					},
				},
			},
			errs: []verr{{
				etype:  field.ErrorTypeRequired,
				field:  "fc.lun",

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