def test_transform_dfs_existing_node(self, patched_transform_op, instance):
res_instance = Resource("resource")
visited = {res_instance.get_id(): instance.BLACK}
instance.transform_dfs(res_instance, set(), set(), visited)
assert patched_transform_op.assert_not_called
def test_transform_dfs_cycle(self, instance):
res_instance = Resource("resource")
visited = {res_instance.get_id(): instance.GREY}
with pytest.raises(exceptions.OrderingException):
instance.transform_dfs(res_instance, set(), set(), visited)