'''Test case for "self.__dict__ = self" circular reference bug (#1469629)'''

from test import test_support
import unittest

import gc


class LeakyDict(dict):
    def __init__(self):
        dict.__init__(self)
        self.__dict__ = self


class DictSelfLeakTestCase(unittest.TestCase):
    def test_for_dict_eq_self_leak(self):
        runs = 1000
        gc.collect(); gc.collect(); gc.collect();

        objcount_before = len(gc.get_objects())

        for x in range(runs):
            a = LeakyDict()

        del x, a  # to keep object count constant

        gc.collect(); gc.collect(); gc.collect()

        objcount_after = len(gc.get_objects())

        # so assertion error traceback gets the actual assertion
        error_string = "leak found: %d new objects in %d runs " % \
                (runs, objcount_after - objcount_before)

        assert objcount_after == objcount_before, error_string


def test_main():
    test_support.run_unittest(DictSelfLeakTestCase)

if __name__ == '__main__':
    test_main()