return nil, f.nextErr
	}

	if req.GetVolumeId() == "" {
		return nil, errors.New("missing volume id")
	}
	if req.GetStagingTargetPath() == "" {
		return nil, errors.New("missing staging target path")
	}

	csiVol := CSIVolume{
		Path:          req.GetStagingTargetPath(),
		VolumeContext: req.GetVolumeContext(),
	}

	fsType := ""
	fsTypes := "block|ext4|xfs|zfs"

					t.Errorf("expected failed precondition error got: %v", err)
				}
			}

			// verify device staging target path
			stagingTargetPath := fakeNodeClient.FakeNodeExpansionRequest.GetStagingTargetPath()
			if tc.deviceStagePath != "" && tc.deviceStagePath != stagingTargetPath {
				t.Errorf("For %s: expected staging path %s got %s", tc.name, tc.deviceStagePath, stagingTargetPath)
			}

			if ok != tc.success {