Fixed a deprecation warning on Python 3.

        obj = self.lazy_wrap(42)

        # __repr__ contains __repr__ of setup function and does not evaluate

        # the SimpleLazyObject

        self.assertRegexpMatches(repr(obj), '^<SimpleLazyObject:')

        six.assertRegex(self, repr(obj), '^<SimpleLazyObject:')

        self.assertIs(obj._wrapped, empty)  # make sure evaluation hasn't been triggered

        self.assertEqual(obj, 42)  # evaluate the lazy object