def test_uncollectable(self):
"""Test uncollectable object tracking.
This is fixed in Python 3.4 (PEP 442).
"""
foo = Foo()
foo.parent = foo
enemy = Enemy()
enemy.parent = enemy
idfoo = id(foo)
idenemy = id(enemy)
del foo
del enemy
gb = GarbageGraph(collectable=0)
gfoo = [x for x in gb.metadata if x.id == idfoo]
self.assertEqual(len(gfoo), 0)
genemy = [x for x in gb.metadata if x.id == idenemy]
if sys.version_info < (3, 4):
self.assertEqual(len(genemy), 1)
self.assertEqual(gb.reduce_to_cycles(), None)
def test_prune(self):
"""Test pruning of reference graph.
"""
foo = Foo()
bar = Bar()
foo.parent = foo
foo.leaf = bar
idb = id(bar)
del foo
del bar
gb1 = GarbageGraph()
gb2 = GarbageGraph(reduce=True)
self.assertEqual(gb1.count, gb2.count)
self.assert_(len(gb1.metadata) > len(gb2.metadata))
gbar = [x for x in gb1.metadata if x.id == idb]
self.assertEqual(len(gbar), 1)
gbar = [x for x in gb2.metadata if x.id == idb]
self.assertEqual(len(gbar), 0)
full = StringIO()
gb1.print_stats(stream=full)
reduced = StringIO()
gb2.print_stats(stream=reduced)
lazy_reduce = StringIO()
gb1_pruned = gb1.reduce_to_cycles()
self.assertTrue(gb1_pruned is gb1.reduce_to_cycles())
gb1_pruned.print_stats(stream=lazy_reduce)
self.assertEqual(lazy_reduce.getvalue(), reduced.getvalue())
self.assertTrue('Foo' in reduced.getvalue())
self.assertFalse('Bar' in reduced.getvalue())
self.assertTrue('Foo' in full.getvalue())
self.assertTrue('Bar' in full.getvalue())
def test_uncollectable(self):
"""Test uncollectable object tracking.
"""
foo = Foo()
foo.parent = foo
enemy = Enemy()
enemy.parent = enemy
idfoo = id(foo)
idenemy = id(enemy)
del foo
del enemy
gb = GarbageGraph(collectable=0)
gfoo = [x for x in gb.metadata if x.id == idfoo]
self.assertEqual(len(gfoo), 0)
genemy = [x for x in gb.metadata if x.id == idenemy]
self.assertEqual(len(genemy), 1)
self.assertEqual(gb.reduce_to_cycles(), None)
