Lib/test/test_gc.py

   1 import gc
   2
   3 def test_list():
   4     l = []
   5     l.append(l)
   6     gc.collect()
   7     del l
   8     assert gc.collect() == 1
   9
  10 def test_dict():
  11     d = {}
  12     d[1] = d
  13     gc.collect()
  14     del d
  15     assert gc.collect() == 1
  16
  17 def test_tuple():
  18     l = []
  19     t = (l,)
  20     l.append(t)
  21     gc.collect()
  22     del t
  23     del l
  24     assert gc.collect() == 2
  25
  26 def test_class():
  27     class A:
  28         pass
  29     A.a = A
  30     gc.collect()
  31     del A
  32     assert gc.collect() > 0
  33
  34 def test_instance():
  35     class A:
  36         pass
  37     a = A()
  38     a.a = a
  39     gc.collect()
  40     del a
  41     assert gc.collect() > 0
  42
  43 def test_method():
  44     class A:
  45         def __init__(self):
  46             self.init = self.__init__
  47     a = A()
  48     gc.collect()
  49     del a
  50     assert gc.collect() > 0
  51
  52 def test_finalizer():
  53     class A:
  54         def __del__(self): pass
  55     class B:
  56         pass
  57     a = A()
  58     a.a = a
  59     id_a = id(a)
  60     b = B()
  61     b.b = b
  62     gc.collect()
  63     gc.garbage[:] = []
  64     del a
  65     del b
  66     assert gc.collect() > 0
  67     assert id(gc.garbage[0]) == id_a
  68
  69 def test_function():
  70     d = {}
  71     exec("def f(): pass\n") in d
  72     gc.collect()
  73     del d
  74     assert gc.collect() == 2
  75
  76
  77 def test_all():
  78
  79     enabled = gc.isenabled()
  80     gc.disable()
  81     assert not gc.isenabled()
  82
  83     test_list()
  84     test_dict()
  85     test_tuple()
  86     test_class()
  87     test_instance()
  88     test_method()
  89     test_finalizer()
  90     test_function()
  91
  92     # test gc.enable() even if GC is disabled by default
  93     gc.enable()
  94     assert gc.isenabled()
  95     if not enabled:
  96         gc.disable()
  97
  98
  99 test_all()