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31 """A subclass of unittest.TestCase which checks for reference leaks.
34 - Use testing_refleak.BaseTestCase instead of unittest.TestCase
35 - Configure and compile Python with --with-pydebug
37 If sys.gettotalrefcount() is not available (because Python was built without
38 the Py_DEBUG option), then this module is a no-op and tests will run normally.
45 import copy_reg as copyreg #PY26
50 import unittest2 as unittest #PY26
55 class LocalTestResult(unittest.TestResult):
56 """A TestResult which forwards events to a parent object, except for Skips."""
58 def __init__(self, parent_result):
59 unittest.TestResult.__init__(self)
60 self.parent_result = parent_result
62 def addError(self, test, error):
63 self.parent_result.addError(test, error)
65 def addFailure(self, test, error):
66 self.parent_result.addFailure(test, error)
68 def addSkip(self, test, reason):
72 class ReferenceLeakCheckerMixin(object):
73 """A mixin class for TestCase, which checks reference counts."""
77 def run(self, result=None):
78 # python_message.py registers all Message classes to some pickle global
79 # registry, which makes the classes immortal.
80 # We save a copy of this registry, and reset it before we could references.
81 self._saved_pickle_registry = copyreg.dispatch_table.copy()
83 # Run the test twice, to warm up the instance attributes.
84 super(ReferenceLeakCheckerMixin, self).run(result=result)
85 super(ReferenceLeakCheckerMixin, self).run(result=result)
88 local_result = LocalTestResult(result)
91 for _ in range(self.NB_RUNS):
92 oldrefcount = self._getRefcounts()
93 super(ReferenceLeakCheckerMixin, self).run(result=local_result)
94 newrefcount = self._getRefcounts()
95 refcount_deltas.append(newrefcount - oldrefcount)
96 print(refcount_deltas, self)
99 self.assertEqual(refcount_deltas, [0] * self.NB_RUNS)
100 except Exception: # pylint: disable=broad-except
101 result.addError(self, sys.exc_info())
103 def _getRefcounts(self):
104 copyreg.dispatch_table.clear()
105 copyreg.dispatch_table.update(self._saved_pickle_registry)
106 # It is sometimes necessary to gc.collect() multiple times, to ensure
107 # that all objects can be collected.
111 return sys.gettotalrefcount()
114 if hasattr(sys, 'gettotalrefcount'):
116 def TestCase(test_class):
117 new_bases = (ReferenceLeakCheckerMixin,) + test_class.__bases__
118 new_class = type(test_class)(
119 test_class.__name__, new_bases, dict(test_class.__dict__))
121 SkipReferenceLeakChecker = unittest.skip
124 # When PyDEBUG is not enabled, run the tests normally.
126 def TestCase(test_class):
129 def SkipReferenceLeakChecker(reason):
130 del reason # Don't skip, so don't need a reason.