func checkListDir(ctx context.Context, t *testing.T, ts topo.Impl, cell string, dirPath string, expected []string) {
entries, err := ts.ListDir(ctx, cell, dirPath)
switch err {
case topo.ErrNoNode:
if len(expected) != 0 {
t.Errorf("ListDir(%v) returned ErrNoNode but was expecting %v", dirPath, expected)
}
case nil:
if !reflect.DeepEqual(entries, expected) {
t.Errorf("ListDir(%v) returned %v but was expecting %v", dirPath, entries, expected)
}
default:
t.Errorf("ListDir(%v) returned unexpected error: %v", dirPath, err)
}
}