Class BOFS

Lib/test/datetimetester.py:5315–5317

        self.assertEqual(0, t.tm_isdst)
        # Check that bad tzinfo is detected
        class BOFS(DST):
            def utcoffset(self, dt):
                return "EST"
        d = cls(1, 2, 3, 10, 20, 30, 40, tzinfo=BOFS())
        self.assertRaises(TypeError, d.utctimetuple)