def test_node_copy():
node = Node('root')
copy = node.copy()
copy.parent = node
assert isinstance(copy, Node)
assert copy.path == 'root'
assert copy.full_path == ('root', 'root')
def test_node_hierarchy():
root = Node('root')
child = Node('child')
child.parent = root
assert child.parent is root
assert child.path == 'child'
assert child.full_path == ('root', 'child')
assert repr(child) == "<Node {'path': root.child}>"