def test_preorder(self):
tree = CWTree(CWRootNode([
CWDocumentNode('doc', [
CWNode('a'),
CWNode('b', [
CWNode('x'),
CWNode('y'),
]),
CWNode('c'),
])
]))
self.assertEqual(
[node.name for node in tree.preorder_traversal()],
['Root', 'Document', 'a', 'b', 'x', 'y', 'c'])
