diff options
| -rw-r--r-- | Lib/test/test_gc.py | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/Lib/test/test_gc.py b/Lib/test/test_gc.py index 7f8e424..e2e6d0c 100644 --- a/Lib/test/test_gc.py +++ b/Lib/test/test_gc.py @@ -15,6 +15,7 @@ def test_dict(): assert gc.collect() == 1 def test_tuple(): + # since tuples are immutable we close the loop with a list l = [] t = (l,) l.append(t) @@ -41,6 +42,7 @@ def test_instance(): assert gc.collect() > 0 def test_method(): + # Tricky: self.__init__ is a bound method, it references the instance. class A: def __init__(self): self.init = self.__init__ @@ -50,6 +52,8 @@ def test_method(): assert gc.collect() > 0 def test_finalizer(): + # A() is uncollectable if it is part of a cycle, make sure it shows up + # in gc.garbage. class A: def __del__(self): pass class B: @@ -67,12 +71,29 @@ def test_finalizer(): assert id(gc.garbage[0]) == id_a def test_function(): + # Tricky: f -> d -> f, code should call d.clear() after the exec to + # break the cycle. d = {} exec("def f(): pass\n") in d gc.collect() del d assert gc.collect() == 2 +def test_del(): + # __del__ methods can trigger collection, make this to happen + thresholds = gc.get_threshold() + gc.enable() + gc.set_threshold(1) + + class A: + def __del__(self): + dir(self) + a = A() + del a + + gc.disable() + apply(gc.set_threshold, thresholds) + def test_all(): @@ -88,6 +109,7 @@ def test_all(): test_method() test_finalizer() test_function() + test_del() # test gc.enable() even if GC is disabled by default gc.enable() |