[Python-checkins] CVS: python/dist/src/Lib/test test_gc.py,1.3,1.4

[Neil Schemenauer]

Update of /cvsroot/python/python/dist/src/Lib/test
In directory slayer.i.sourceforge.net:/tmp/cvs-serv16973/Lib/test

Modified Files:
	test_gc.py 
Log Message:
- add a new test
- document some of the tricky tests (hopefully correctly :)


Index: test_gc.py
===================================================================
RCS file: /cvsroot/python/python/dist/src/Lib/test/test_gc.py,v
retrieving revision 1.3
retrieving revision 1.4
diff -C2 -r1.3 -r1.4
*** test_gc.py	2000/08/06 22:45:31	1.3
--- test_gc.py	2000/09/15 22:32:29	1.4
***************
*** 16,19 ****
--- 16,20 ----
  
  def test_tuple():
+     # since tuples are immutable we close the loop with a list
      l = []
      t = (l,)
***************
*** 42,45 ****
--- 43,47 ----
  
  def test_method():
+     # Tricky: self.__init__ is a bound method, it references the instance.
      class A:
          def __init__(self):
***************
*** 51,54 ****
--- 53,58 ----
  
  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
***************
*** 68,71 ****
--- 72,77 ----
  
  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
***************
*** 74,77 ****
--- 80,98 ----
      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():
***************
*** 89,92 ****
--- 110,114 ----
      test_finalizer()
      test_function()
+     test_del()
  
      # test gc.enable() even if GC is disabled by default