def test_del_at_non_existent_path(example_tree):
with pytest.raises(AttributeError):
del_at(example_tree, ('does', 'not', 'exist'))
def test_del_at_non_existent_leaf(example_tree):
with pytest.raises(AttributeError):
del_at(example_tree, ('foo', 'bar', 'new_node'))
def test_del_at_empty_path(example_tree):
with pytest.raises(ValueError):
del_at(example_tree, [])
def test_del_at_empty_path_in_empty_tree():
with pytest.raises(ValueError):
del_at(Tree(), [])
def test_del_at_can_remove_a_subtree(example_tree):
pre_exisiting_paths = {path for path, _ in walk(example_tree)}
del_at(example_tree, ('foo', 'bar'))
assert {path for path, _ in walk(example_tree)} == pre_exisiting_paths - {('foo', 'bar', 'baz'),
('foo', 'bar', 'bang')}
