private final ImmutableTree rootTree = new ImmutableTree(root);
@Test
public void selectDescendant() {
String path = "/a/b/c";
Selector selector = new RelativePathSelector(path, Selectors.PARENT);
UniversalFilter filter = new UniversalFilter(rootTree, rootTree, selector, ALL);
assertEquals(path, selector.select(filter, null, null).getPath());
}