Class MyFileIO

Lib/test/test_io.py:690–704

    def test_destructor(self):
        record = []
        class MyFileIO(self.FileIO):
            def __del__(self):
                record.append(1)
                try:
                    f = super().__del__
                except AttributeError:
                    pass
                else:
                    f()
            def close(self):
                record.append(2)
                super().close()
            def flush(self):
                record.append(3)
                super().flush()
        with warnings_helper.check_warnings(('', ResourceWarning)):
            f = MyFileIO(os_helper.TESTFN, "wb")
            f.write(b"xxx")