/usr/lib/python2.7/dist-packages/traits/tests/test_weak_ref.py is in python-traits 4.6.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Copyright (c) 2013, Enthought, Inc.
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in /LICENSE.txt and may be redistributed only
# under the conditions described in the aforementioned license. The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
#
# Thanks for using Enthought open source!
#
#------------------------------------------------------------------------------
""" Test cases for weakref (WeakRef) traits. """
import contextlib
import gc
from traits.testing.unittest_tools import unittest, UnittestTools
from ..trait_types import Str, WeakRef
from ..has_traits import HasTraits
class Eggs(HasTraits):
name = Str
class Spam(HasTraits):
eggs = WeakRef(Eggs)
@contextlib.contextmanager
def restore_gc_state():
"""Ensure that gc state is restored on exit of the with statement."""
originally_enabled = gc.isenabled()
try:
yield
finally:
if originally_enabled:
gc.enable()
else:
gc.disable()
class TestWeakRef(UnittestTools, unittest.TestCase):
""" Test cases for weakref (WeakRef) traits. """
def test_set_and_get(self):
eggs = Eggs(name='platypus')
spam = Spam()
self.assertIsNone(spam.eggs)
spam.eggs = eggs
self.assertIs(spam.eggs, eggs)
del eggs
self.assertIsNone(spam.eggs)
def test_target_freed_notification(self):
eggs = Eggs(name='duck')
spam = Spam(eggs=eggs)
# Removal of the last reference to 'eggs' should trigger notification.
with self.assertTraitChanges(spam, 'eggs'):
del eggs
def test_weakref_trait_doesnt_leak_cycles(self):
eggs = Eggs(name='ostrich')
with restore_gc_state():
gc.disable()
gc.collect()
spam = Spam(eggs=eggs)
del spam
self.assertEqual(gc.collect(), 0)
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