679 lines
22 KiB
Python
679 lines
22 KiB
Python
import unittest
|
|
from test.support import verbose, run_unittest, strip_python_stderr
|
|
import sys
|
|
import gc
|
|
import weakref
|
|
|
|
### Support code
|
|
###############################################################################
|
|
|
|
# Bug 1055820 has several tests of longstanding bugs involving weakrefs and
|
|
# cyclic gc.
|
|
|
|
# An instance of C1055820 has a self-loop, so becomes cyclic trash when
|
|
# unreachable.
|
|
class C1055820(object):
|
|
def __init__(self, i):
|
|
self.i = i
|
|
self.loop = self
|
|
|
|
class GC_Detector(object):
|
|
# Create an instance I. Then gc hasn't happened again so long as
|
|
# I.gc_happened is false.
|
|
|
|
def __init__(self):
|
|
self.gc_happened = False
|
|
|
|
def it_happened(ignored):
|
|
self.gc_happened = True
|
|
|
|
# Create a piece of cyclic trash that triggers it_happened when
|
|
# gc collects it.
|
|
self.wr = weakref.ref(C1055820(666), it_happened)
|
|
|
|
|
|
### Tests
|
|
###############################################################################
|
|
|
|
class GCTests(unittest.TestCase):
|
|
def test_list(self):
|
|
l = []
|
|
l.append(l)
|
|
gc.collect()
|
|
del l
|
|
self.assertEqual(gc.collect(), 1)
|
|
|
|
def test_dict(self):
|
|
d = {}
|
|
d[1] = d
|
|
gc.collect()
|
|
del d
|
|
self.assertEqual(gc.collect(), 1)
|
|
|
|
def test_tuple(self):
|
|
# since tuples are immutable we close the loop with a list
|
|
l = []
|
|
t = (l,)
|
|
l.append(t)
|
|
gc.collect()
|
|
del t
|
|
del l
|
|
self.assertEqual(gc.collect(), 2)
|
|
|
|
def test_class(self):
|
|
class A:
|
|
pass
|
|
A.a = A
|
|
gc.collect()
|
|
del A
|
|
self.assertNotEqual(gc.collect(), 0)
|
|
|
|
def test_newstyleclass(self):
|
|
class A(object):
|
|
pass
|
|
gc.collect()
|
|
del A
|
|
self.assertNotEqual(gc.collect(), 0)
|
|
|
|
def test_instance(self):
|
|
class A:
|
|
pass
|
|
a = A()
|
|
a.a = a
|
|
gc.collect()
|
|
del a
|
|
self.assertNotEqual(gc.collect(), 0)
|
|
|
|
def test_newinstance(self):
|
|
class A(object):
|
|
pass
|
|
a = A()
|
|
a.a = a
|
|
gc.collect()
|
|
del a
|
|
self.assertNotEqual(gc.collect(), 0)
|
|
class B(list):
|
|
pass
|
|
class C(B, A):
|
|
pass
|
|
a = C()
|
|
a.a = a
|
|
gc.collect()
|
|
del a
|
|
self.assertNotEqual(gc.collect(), 0)
|
|
del B, C
|
|
self.assertNotEqual(gc.collect(), 0)
|
|
A.a = A()
|
|
del A
|
|
self.assertNotEqual(gc.collect(), 0)
|
|
self.assertEqual(gc.collect(), 0)
|
|
|
|
def test_method(self):
|
|
# Tricky: self.__init__ is a bound method, it references the instance.
|
|
class A:
|
|
def __init__(self):
|
|
self.init = self.__init__
|
|
a = A()
|
|
gc.collect()
|
|
del a
|
|
self.assertNotEqual(gc.collect(), 0)
|
|
|
|
def test_finalizer(self):
|
|
# 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:
|
|
pass
|
|
a = A()
|
|
a.a = a
|
|
id_a = id(a)
|
|
b = B()
|
|
b.b = b
|
|
gc.collect()
|
|
del a
|
|
del b
|
|
self.assertNotEqual(gc.collect(), 0)
|
|
for obj in gc.garbage:
|
|
if id(obj) == id_a:
|
|
del obj.a
|
|
break
|
|
else:
|
|
self.fail("didn't find obj in garbage (finalizer)")
|
|
gc.garbage.remove(obj)
|
|
|
|
def test_finalizer_newclass(self):
|
|
# A() is uncollectable if it is part of a cycle, make sure it shows up
|
|
# in gc.garbage.
|
|
class A(object):
|
|
def __del__(self): pass
|
|
class B(object):
|
|
pass
|
|
a = A()
|
|
a.a = a
|
|
id_a = id(a)
|
|
b = B()
|
|
b.b = b
|
|
gc.collect()
|
|
del a
|
|
del b
|
|
self.assertNotEqual(gc.collect(), 0)
|
|
for obj in gc.garbage:
|
|
if id(obj) == id_a:
|
|
del obj.a
|
|
break
|
|
else:
|
|
self.fail("didn't find obj in garbage (finalizer)")
|
|
gc.garbage.remove(obj)
|
|
|
|
def test_function(self):
|
|
# Tricky: f -> d -> f, code should call d.clear() after the exec to
|
|
# break the cycle.
|
|
d = {}
|
|
exec("def f(): pass\n", d)
|
|
gc.collect()
|
|
del d
|
|
self.assertEqual(gc.collect(), 2)
|
|
|
|
def test_frame(self):
|
|
def f():
|
|
frame = sys._getframe()
|
|
gc.collect()
|
|
f()
|
|
self.assertEqual(gc.collect(), 1)
|
|
|
|
def test_saveall(self):
|
|
# Verify that cyclic garbage like lists show up in gc.garbage if the
|
|
# SAVEALL option is enabled.
|
|
|
|
# First make sure we don't save away other stuff that just happens to
|
|
# be waiting for collection.
|
|
gc.collect()
|
|
# if this fails, someone else created immortal trash
|
|
self.assertEqual(gc.garbage, [])
|
|
|
|
L = []
|
|
L.append(L)
|
|
id_L = id(L)
|
|
|
|
debug = gc.get_debug()
|
|
gc.set_debug(debug | gc.DEBUG_SAVEALL)
|
|
del L
|
|
gc.collect()
|
|
gc.set_debug(debug)
|
|
|
|
self.assertEqual(len(gc.garbage), 1)
|
|
obj = gc.garbage.pop()
|
|
self.assertEqual(id(obj), id_L)
|
|
|
|
def test_del(self):
|
|
# __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()
|
|
gc.set_threshold(*thresholds)
|
|
|
|
def test_del_newclass(self):
|
|
# __del__ methods can trigger collection, make this to happen
|
|
thresholds = gc.get_threshold()
|
|
gc.enable()
|
|
gc.set_threshold(1)
|
|
|
|
class A(object):
|
|
def __del__(self):
|
|
dir(self)
|
|
a = A()
|
|
del a
|
|
|
|
gc.disable()
|
|
gc.set_threshold(*thresholds)
|
|
|
|
# The following two tests are fragile:
|
|
# They precisely count the number of allocations,
|
|
# which is highly implementation-dependent.
|
|
# For example:
|
|
# - disposed tuples are not freed, but reused
|
|
# - the call to assertEqual somehow avoids building its args tuple
|
|
def test_get_count(self):
|
|
# Avoid future allocation of method object
|
|
assertEqual = self._baseAssertEqual
|
|
gc.collect()
|
|
assertEqual(gc.get_count(), (0, 0, 0))
|
|
a = dict()
|
|
# since gc.collect(), we created two objects:
|
|
# the dict, and the tuple returned by get_count()
|
|
assertEqual(gc.get_count(), (2, 0, 0))
|
|
|
|
def test_collect_generations(self):
|
|
# Avoid future allocation of method object
|
|
assertEqual = self.assertEqual
|
|
gc.collect()
|
|
a = dict()
|
|
gc.collect(0)
|
|
assertEqual(gc.get_count(), (0, 1, 0))
|
|
gc.collect(1)
|
|
assertEqual(gc.get_count(), (0, 0, 1))
|
|
gc.collect(2)
|
|
assertEqual(gc.get_count(), (0, 0, 0))
|
|
|
|
def test_trashcan(self):
|
|
class Ouch:
|
|
n = 0
|
|
def __del__(self):
|
|
Ouch.n = Ouch.n + 1
|
|
if Ouch.n % 17 == 0:
|
|
gc.collect()
|
|
|
|
# "trashcan" is a hack to prevent stack overflow when deallocating
|
|
# very deeply nested tuples etc. It works in part by abusing the
|
|
# type pointer and refcount fields, and that can yield horrible
|
|
# problems when gc tries to traverse the structures.
|
|
# If this test fails (as it does in 2.0, 2.1 and 2.2), it will
|
|
# most likely die via segfault.
|
|
|
|
# Note: In 2.3 the possibility for compiling without cyclic gc was
|
|
# removed, and that in turn allows the trashcan mechanism to work
|
|
# via much simpler means (e.g., it never abuses the type pointer or
|
|
# refcount fields anymore). Since it's much less likely to cause a
|
|
# problem now, the various constants in this expensive (we force a lot
|
|
# of full collections) test are cut back from the 2.2 version.
|
|
gc.enable()
|
|
N = 150
|
|
for count in range(2):
|
|
t = []
|
|
for i in range(N):
|
|
t = [t, Ouch()]
|
|
u = []
|
|
for i in range(N):
|
|
u = [u, Ouch()]
|
|
v = {}
|
|
for i in range(N):
|
|
v = {1: v, 2: Ouch()}
|
|
gc.disable()
|
|
|
|
def test_boom(self):
|
|
class Boom:
|
|
def __getattr__(self, someattribute):
|
|
del self.attr
|
|
raise AttributeError
|
|
|
|
a = Boom()
|
|
b = Boom()
|
|
a.attr = b
|
|
b.attr = a
|
|
|
|
gc.collect()
|
|
garbagelen = len(gc.garbage)
|
|
del a, b
|
|
# a<->b are in a trash cycle now. Collection will invoke
|
|
# Boom.__getattr__ (to see whether a and b have __del__ methods), and
|
|
# __getattr__ deletes the internal "attr" attributes as a side effect.
|
|
# That causes the trash cycle to get reclaimed via refcounts falling to
|
|
# 0, thus mutating the trash graph as a side effect of merely asking
|
|
# whether __del__ exists. This used to (before 2.3b1) crash Python.
|
|
# Now __getattr__ isn't called.
|
|
self.assertEqual(gc.collect(), 4)
|
|
self.assertEqual(len(gc.garbage), garbagelen)
|
|
|
|
def test_boom2(self):
|
|
class Boom2:
|
|
def __init__(self):
|
|
self.x = 0
|
|
|
|
def __getattr__(self, someattribute):
|
|
self.x += 1
|
|
if self.x > 1:
|
|
del self.attr
|
|
raise AttributeError
|
|
|
|
a = Boom2()
|
|
b = Boom2()
|
|
a.attr = b
|
|
b.attr = a
|
|
|
|
gc.collect()
|
|
garbagelen = len(gc.garbage)
|
|
del a, b
|
|
# Much like test_boom(), except that __getattr__ doesn't break the
|
|
# cycle until the second time gc checks for __del__. As of 2.3b1,
|
|
# there isn't a second time, so this simply cleans up the trash cycle.
|
|
# We expect a, b, a.__dict__ and b.__dict__ (4 objects) to get
|
|
# reclaimed this way.
|
|
self.assertEqual(gc.collect(), 4)
|
|
self.assertEqual(len(gc.garbage), garbagelen)
|
|
|
|
def test_boom_new(self):
|
|
# boom__new and boom2_new are exactly like boom and boom2, except use
|
|
# new-style classes.
|
|
|
|
class Boom_New(object):
|
|
def __getattr__(self, someattribute):
|
|
del self.attr
|
|
raise AttributeError
|
|
|
|
a = Boom_New()
|
|
b = Boom_New()
|
|
a.attr = b
|
|
b.attr = a
|
|
|
|
gc.collect()
|
|
garbagelen = len(gc.garbage)
|
|
del a, b
|
|
self.assertEqual(gc.collect(), 4)
|
|
self.assertEqual(len(gc.garbage), garbagelen)
|
|
|
|
def test_boom2_new(self):
|
|
class Boom2_New(object):
|
|
def __init__(self):
|
|
self.x = 0
|
|
|
|
def __getattr__(self, someattribute):
|
|
self.x += 1
|
|
if self.x > 1:
|
|
del self.attr
|
|
raise AttributeError
|
|
|
|
a = Boom2_New()
|
|
b = Boom2_New()
|
|
a.attr = b
|
|
b.attr = a
|
|
|
|
gc.collect()
|
|
garbagelen = len(gc.garbage)
|
|
del a, b
|
|
self.assertEqual(gc.collect(), 4)
|
|
self.assertEqual(len(gc.garbage), garbagelen)
|
|
|
|
def test_get_referents(self):
|
|
alist = [1, 3, 5]
|
|
got = gc.get_referents(alist)
|
|
got.sort()
|
|
self.assertEqual(got, alist)
|
|
|
|
atuple = tuple(alist)
|
|
got = gc.get_referents(atuple)
|
|
got.sort()
|
|
self.assertEqual(got, alist)
|
|
|
|
adict = {1: 3, 5: 7}
|
|
expected = [1, 3, 5, 7]
|
|
got = gc.get_referents(adict)
|
|
got.sort()
|
|
self.assertEqual(got, expected)
|
|
|
|
got = gc.get_referents([1, 2], {3: 4}, (0, 0, 0))
|
|
got.sort()
|
|
self.assertEqual(got, [0, 0] + list(range(5)))
|
|
|
|
self.assertEqual(gc.get_referents(1, 'a', 4j), [])
|
|
|
|
def test_is_tracked(self):
|
|
# Atomic built-in types are not tracked, user-defined objects and
|
|
# mutable containers are.
|
|
# NOTE: types with special optimizations (e.g. tuple) have tests
|
|
# in their own test files instead.
|
|
self.assertFalse(gc.is_tracked(None))
|
|
self.assertFalse(gc.is_tracked(1))
|
|
self.assertFalse(gc.is_tracked(1.0))
|
|
self.assertFalse(gc.is_tracked(1.0 + 5.0j))
|
|
self.assertFalse(gc.is_tracked(True))
|
|
self.assertFalse(gc.is_tracked(False))
|
|
self.assertFalse(gc.is_tracked(b"a"))
|
|
self.assertFalse(gc.is_tracked("a"))
|
|
self.assertFalse(gc.is_tracked(bytearray(b"a")))
|
|
self.assertFalse(gc.is_tracked(type))
|
|
self.assertFalse(gc.is_tracked(int))
|
|
self.assertFalse(gc.is_tracked(object))
|
|
self.assertFalse(gc.is_tracked(object()))
|
|
|
|
class UserClass:
|
|
pass
|
|
self.assertTrue(gc.is_tracked(gc))
|
|
self.assertTrue(gc.is_tracked(UserClass))
|
|
self.assertTrue(gc.is_tracked(UserClass()))
|
|
self.assertTrue(gc.is_tracked([]))
|
|
self.assertTrue(gc.is_tracked(set()))
|
|
|
|
def test_bug1055820b(self):
|
|
# Corresponds to temp2b.py in the bug report.
|
|
|
|
ouch = []
|
|
def callback(ignored):
|
|
ouch[:] = [wr() for wr in WRs]
|
|
|
|
Cs = [C1055820(i) for i in range(2)]
|
|
WRs = [weakref.ref(c, callback) for c in Cs]
|
|
c = None
|
|
|
|
gc.collect()
|
|
self.assertEqual(len(ouch), 0)
|
|
# Make the two instances trash, and collect again. The bug was that
|
|
# the callback materialized a strong reference to an instance, but gc
|
|
# cleared the instance's dict anyway.
|
|
Cs = None
|
|
gc.collect()
|
|
self.assertEqual(len(ouch), 2) # else the callbacks didn't run
|
|
for x in ouch:
|
|
# If the callback resurrected one of these guys, the instance
|
|
# would be damaged, with an empty __dict__.
|
|
self.assertEqual(x, None)
|
|
|
|
def test_garbage_at_shutdown(self):
|
|
import subprocess
|
|
code = """if 1:
|
|
import gc
|
|
class X:
|
|
def __init__(self, name):
|
|
self.name = name
|
|
def __repr__(self):
|
|
return "<X %%r>" %% self.name
|
|
def __del__(self):
|
|
pass
|
|
|
|
x = X('first')
|
|
x.x = x
|
|
x.y = X('second')
|
|
del x
|
|
gc.set_debug(%s)
|
|
"""
|
|
def run_command(code):
|
|
p = subprocess.Popen([sys.executable, "-c", code],
|
|
stdout=subprocess.PIPE,
|
|
stderr=subprocess.PIPE)
|
|
stdout, stderr = p.communicate()
|
|
self.assertEqual(p.returncode, 0)
|
|
self.assertEqual(stdout.strip(), b"")
|
|
return strip_python_stderr(stderr)
|
|
|
|
stderr = run_command(code % "0")
|
|
self.assertIn(b"gc: 2 uncollectable objects at shutdown", stderr)
|
|
self.assertNotIn(b"<X 'first'>", stderr)
|
|
# With DEBUG_UNCOLLECTABLE, the garbage list gets printed
|
|
stderr = run_command(code % "gc.DEBUG_UNCOLLECTABLE")
|
|
self.assertIn(b"gc: 2 uncollectable objects at shutdown", stderr)
|
|
self.assertTrue(
|
|
(b"[<X 'first'>, <X 'second'>]" in stderr) or
|
|
(b"[<X 'second'>, <X 'first'>]" in stderr), stderr)
|
|
# With DEBUG_SAVEALL, no additional message should get printed
|
|
# (because gc.garbage also contains normally reclaimable cyclic
|
|
# references, and its elements get printed at runtime anyway).
|
|
stderr = run_command(code % "gc.DEBUG_SAVEALL")
|
|
self.assertNotIn(b"uncollectable objects at shutdown", stderr)
|
|
|
|
|
|
class GCTogglingTests(unittest.TestCase):
|
|
def setUp(self):
|
|
gc.enable()
|
|
|
|
def tearDown(self):
|
|
gc.disable()
|
|
|
|
def test_bug1055820c(self):
|
|
# Corresponds to temp2c.py in the bug report. This is pretty
|
|
# elaborate.
|
|
|
|
c0 = C1055820(0)
|
|
# Move c0 into generation 2.
|
|
gc.collect()
|
|
|
|
c1 = C1055820(1)
|
|
c1.keep_c0_alive = c0
|
|
del c0.loop # now only c1 keeps c0 alive
|
|
|
|
c2 = C1055820(2)
|
|
c2wr = weakref.ref(c2) # no callback!
|
|
|
|
ouch = []
|
|
def callback(ignored):
|
|
ouch[:] = [c2wr()]
|
|
|
|
# The callback gets associated with a wr on an object in generation 2.
|
|
c0wr = weakref.ref(c0, callback)
|
|
|
|
c0 = c1 = c2 = None
|
|
|
|
# What we've set up: c0, c1, and c2 are all trash now. c0 is in
|
|
# generation 2. The only thing keeping it alive is that c1 points to
|
|
# it. c1 and c2 are in generation 0, and are in self-loops. There's a
|
|
# global weakref to c2 (c2wr), but that weakref has no callback.
|
|
# There's also a global weakref to c0 (c0wr), and that does have a
|
|
# callback, and that callback references c2 via c2wr().
|
|
#
|
|
# c0 has a wr with callback, which references c2wr
|
|
# ^
|
|
# |
|
|
# | Generation 2 above dots
|
|
#. . . . . . . .|. . . . . . . . . . . . . . . . . . . . . . . .
|
|
# | Generation 0 below dots
|
|
# |
|
|
# |
|
|
# ^->c1 ^->c2 has a wr but no callback
|
|
# | | | |
|
|
# <--v <--v
|
|
#
|
|
# So this is the nightmare: when generation 0 gets collected, we see
|
|
# that c2 has a callback-free weakref, and c1 doesn't even have a
|
|
# weakref. Collecting generation 0 doesn't see c0 at all, and c0 is
|
|
# the only object that has a weakref with a callback. gc clears c1
|
|
# and c2. Clearing c1 has the side effect of dropping the refcount on
|
|
# c0 to 0, so c0 goes away (despite that it's in an older generation)
|
|
# and c0's wr callback triggers. That in turn materializes a reference
|
|
# to c2 via c2wr(), but c2 gets cleared anyway by gc.
|
|
|
|
# We want to let gc happen "naturally", to preserve the distinction
|
|
# between generations.
|
|
junk = []
|
|
i = 0
|
|
detector = GC_Detector()
|
|
while not detector.gc_happened:
|
|
i += 1
|
|
if i > 10000:
|
|
self.fail("gc didn't happen after 10000 iterations")
|
|
self.assertEqual(len(ouch), 0)
|
|
junk.append([]) # this will eventually trigger gc
|
|
|
|
self.assertEqual(len(ouch), 1) # else the callback wasn't invoked
|
|
for x in ouch:
|
|
# If the callback resurrected c2, the instance would be damaged,
|
|
# with an empty __dict__.
|
|
self.assertEqual(x, None)
|
|
|
|
def test_bug1055820d(self):
|
|
# Corresponds to temp2d.py in the bug report. This is very much like
|
|
# test_bug1055820c, but uses a __del__ method instead of a weakref
|
|
# callback to sneak in a resurrection of cyclic trash.
|
|
|
|
ouch = []
|
|
class D(C1055820):
|
|
def __del__(self):
|
|
ouch[:] = [c2wr()]
|
|
|
|
d0 = D(0)
|
|
# Move all the above into generation 2.
|
|
gc.collect()
|
|
|
|
c1 = C1055820(1)
|
|
c1.keep_d0_alive = d0
|
|
del d0.loop # now only c1 keeps d0 alive
|
|
|
|
c2 = C1055820(2)
|
|
c2wr = weakref.ref(c2) # no callback!
|
|
|
|
d0 = c1 = c2 = None
|
|
|
|
# What we've set up: d0, c1, and c2 are all trash now. d0 is in
|
|
# generation 2. The only thing keeping it alive is that c1 points to
|
|
# it. c1 and c2 are in generation 0, and are in self-loops. There's
|
|
# a global weakref to c2 (c2wr), but that weakref has no callback.
|
|
# There are no other weakrefs.
|
|
#
|
|
# d0 has a __del__ method that references c2wr
|
|
# ^
|
|
# |
|
|
# | Generation 2 above dots
|
|
#. . . . . . . .|. . . . . . . . . . . . . . . . . . . . . . . .
|
|
# | Generation 0 below dots
|
|
# |
|
|
# |
|
|
# ^->c1 ^->c2 has a wr but no callback
|
|
# | | | |
|
|
# <--v <--v
|
|
#
|
|
# So this is the nightmare: when generation 0 gets collected, we see
|
|
# that c2 has a callback-free weakref, and c1 doesn't even have a
|
|
# weakref. Collecting generation 0 doesn't see d0 at all. gc clears
|
|
# c1 and c2. Clearing c1 has the side effect of dropping the refcount
|
|
# on d0 to 0, so d0 goes away (despite that it's in an older
|
|
# generation) and d0's __del__ triggers. That in turn materializes
|
|
# a reference to c2 via c2wr(), but c2 gets cleared anyway by gc.
|
|
|
|
# We want to let gc happen "naturally", to preserve the distinction
|
|
# between generations.
|
|
detector = GC_Detector()
|
|
junk = []
|
|
i = 0
|
|
while not detector.gc_happened:
|
|
i += 1
|
|
if i > 10000:
|
|
self.fail("gc didn't happen after 10000 iterations")
|
|
self.assertEqual(len(ouch), 0)
|
|
junk.append([]) # this will eventually trigger gc
|
|
|
|
self.assertEqual(len(ouch), 1) # else __del__ wasn't invoked
|
|
for x in ouch:
|
|
# If __del__ resurrected c2, the instance would be damaged, with an
|
|
# empty __dict__.
|
|
self.assertEqual(x, None)
|
|
|
|
def test_main():
|
|
enabled = gc.isenabled()
|
|
gc.disable()
|
|
assert not gc.isenabled()
|
|
debug = gc.get_debug()
|
|
gc.set_debug(debug & ~gc.DEBUG_LEAK) # this test is supposed to leak
|
|
|
|
try:
|
|
gc.collect() # Delete 2nd generation garbage
|
|
run_unittest(GCTests, GCTogglingTests)
|
|
finally:
|
|
gc.set_debug(debug)
|
|
# test gc.enable() even if GC is disabled by default
|
|
if verbose:
|
|
print("restoring automatic collection")
|
|
# make sure to always test gc.enable()
|
|
gc.enable()
|
|
assert gc.isenabled()
|
|
if not enabled:
|
|
gc.disable()
|
|
|
|
if __name__ == "__main__":
|
|
test_main()
|