Method test_no_exception_leak

Lib/test/test_unittest/test_case.py:2316–2341

(self)

            self.assertFalse(wr())

    def test_no_exception_leak(self):
        # Issue #19880: TestCase.run() should not keep a reference
        # to the exception
        class MyException(Exception):
            ninstance = 0

            def __init__(self):
                MyException.ninstance += 1
                Exception.__init__(self)

            def __del__(self):
                MyException.ninstance -= 1

        class TestCase(unittest.TestCase):
            def test1(self):
                raise MyException()

            @unittest.expectedFailure
            def test2(self):
                raise MyException()

        for method_name in ('test1', 'test2'):
            testcase = TestCase(method_name)
            testcase.run()
            gc_collect()  # For PyPy or other GCs.
            self.assertEqual(MyException.ninstance, 0)


if __name__ == "__main__":