### Question:
TreesImpl implements Trees { @Override public TreeSelectorFactory treeSelectors() { return treeSelectorFactory; } TreesImpl(); @Override TreeSelectorFactory treeSelectors(); @Override NodeSelectorFactory nodeSelectors(); @Override TreeWalkerFactory treeWalkers(); @Override TreeIteratorFactory treeIterators(); @Override NodeStreamFactory nodeStreams(); @Override TreeBuilderFactory treeBuilders(); @Override TreeTransformer transformations(); @Override Querier querier(); @Override SimpleCollection<Class<?>> availableTreeImplementations();  }### Answer:
@Test public void treeSelectors() { final Trees trees = Trees.get(); final TreeSelectorFactory selectors = trees.treeSelectors(); assertTrue(selectors instanceof TreeSelectorFactoryImpl); }