Method test_resurrection_is_transitive

Lib/test/test_gc.py:963–995

(self)

        gc.enable()

    def test_resurrection_is_transitive(self):
        class Cargo:
            def __init__(self):
                self.me = self

        class Lazarus:
            resurrected_instances = []

            def __del__(self):
                Lazarus.resurrected_instances.append(self)

        gc.collect()
        gc.disable()

        laz = Lazarus()
        cargo = Cargo()
        cargo_id = id(cargo)

        # Create a cycle between cargo and laz
        laz.cargo = cargo
        cargo.laz = laz

        # Drop the references, force a collection and check that
        # everything was resurrected.
        del laz, cargo
        gc.collect()
        self.assertEqual(len(Lazarus.resurrected_instances), 1)
        instance = Lazarus.resurrected_instances.pop()
        self.assertHasAttr(instance, "cargo")
        self.assertEqual(id(instance.cargo), cargo_id)

        gc.collect()
        gc.enable()

    def test_resurrection_does_not_block_cleanup_of_other_objects(self):