Class Bogus

Lib/test/datetimetester.py:3119–3121

        self.assertEqual(dt.astimezone(tz=f), dt_f) # naive

        class Bogus(tzinfo):
            def utcoffset(self, dt): return None
            def dst(self, dt): return timedelta(0)
        bog = Bogus()
        self.assertRaises(ValueError, dt.astimezone, bog)   # naive
        self.assertEqual(dt.replace(tzinfo=bog).astimezone(f), dt_f)