}
	fivs, err := getFileInfoVersions(buf, basefi.Volume, basefi.Name, false)
	if err != nil {
		t.Fatalf("getFileInfoVersions failed: %v", err)
	}
	chkNumVersions := func(fis []FileInfo) bool {
		for i := 0; i < len(fis)-1; i++ {
			if fis[i].NumVersions != fis[i+1].NumVersions {
				return false
			}
		}
		return true
	}
	if !chkNumVersions(fivs.Versions) {
		t.Fatalf("Expected all versions to have the same NumVersions")

	for !done {
		// Read up to max number of entries.
		fis, err := d.Readdir(maxEntries)
		if err != nil {
			if err == io.EOF {
				break
			}
			return nil, osErrToFileErr(err)
		}
		if opts.count > -1 {
			if remaining <= len(fis) {
				fis = fis[:remaining]
				done = true
			}
		}
		for _, fi := range fis {
			if fi.Mode()&os.ModeSymlink == os.ModeSymlink {

  }

  private inline fun <T> assertOnFileDescriptor(
    content: String? = null,
    fn: (FileDescriptor) -> T,
  ): T =
    assertOnPath(content) {
      FileInputStream(filePath.toFile()).use { fis ->
        fn(fis.fd)
      }
    }

  private inline fun <T> assertOnPath(
    content: String? = null,
    fn: (okio.Path) -> T,
  ): T {
    FileSystem.SYSTEM.write(filePath) {
      if (content != null) {