[issue42866] test test_multibytecodec: Test_IncrementalEncoder.test_subinterp() leaks references

[STINNER Victor]

STINNER Victor <vstin...@python.org> added the comment:

The leak can be simplified to:

    @support.cpython_only
    def test_subinterp(self):
        import _testcapi
        code = textwrap.dedent("""
            import encodings
            import _codecs_jp
            encodings._cache['cp932'] = _codecs_jp.getcodec('cp932')
        """)
        res = _testcapi.run_in_subinterp(code)
        self.assertEqual(res, 0)

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<https://bugs.python.org/issue42866>
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