if err != io.EOF {
		t.Fatal(err, entries.len())
	}
	want := loadMetacacheSampleNames
	var noDirs []string
	for i, entry := range entries.entries() {
		if entry.name != want[i] {
			t.Errorf("entry %d, want %q, got %q", i, want[i], entry.name)
		}
		if !entry.isDir() {
			noDirs = append(noDirs, entry.name)
		}
	}
	if entries.len() != len(want) {

          "web.MIT.edu",
          "www.google.com",
          "www.state.pa.us",
          "www4.yahoo.co.uk"
          // keep-sorted end
          );

  private static final ImmutableSet<String> NON_RS =
      ImmutableSet.<String>builder().addAll(NON_PS).addAll(PS_NOT_RS).build();

  private static final ImmutableSet<String> TOP_UNDER_REGISTRY_SUFFIX =
      ImmutableSet.of("google.com", "foo.Co.uk", "foo.ca.us.");

	testCases := []struct {
		volumeName     string
		prefix         string
		expectedResult []string
		expectErr      bool
	}{
		{"foo", "path", []string{"to/"}, false},
		// prefix not found error.
		{"foo", "nodir", nil, true},
	}

	for i, testCase := range testCases {
		result, err := storage.ListDir(t.Context(), "", testCase.volumeName, testCase.prefix, -1)
		expectErr := (err != nil)

		if expectErr != testCase.expectErr {