Method test_one_transition

Lib/test/test_zoneinfo/test_zoneinfo.py:592–631

(self)

    module = py_zoneinfo

    def test_one_transition(self):
        LMT = ZoneOffset("LMT", -timedelta(hours=6, minutes=31, seconds=2))
        STD = ZoneOffset("STD", -timedelta(hours=6))

        transitions = [
            ZoneTransition(datetime(1883, 6, 9, 14), LMT, STD),
        ]

        after = "STD6"

        zf = self.construct_zone(transitions, after)
        zi = self.klass.from_file(zf)

        dt0 = datetime(1883, 6, 9, 1, tzinfo=zi)
        dt1 = datetime(1883, 6, 10, 1, tzinfo=zi)

        for dt, offset in [(dt0, LMT), (dt1, STD)]:
            with self.subTest(name="local", dt=dt):
                self.assertEqual(dt.tzname(), offset.tzname)
                self.assertEqual(dt.utcoffset(), offset.utcoffset)
                self.assertEqual(dt.dst(), offset.dst)

        dts = [
            (
                datetime(1883, 6, 9, 1, tzinfo=zi),
                datetime(1883, 6, 9, 7, 31, 2, tzinfo=timezone.utc),
            ),
            (
                datetime(2010, 4, 1, 12, tzinfo=zi),
                datetime(2010, 4, 1, 18, tzinfo=timezone.utc),
            ),
        ]

        for dt_local, dt_utc in dts:
            with self.subTest(name="fromutc", dt=dt_local):
                dt_actual = dt_utc.astimezone(zi)
                self.assertEqual(dt_actual, dt_local)

                dt_utc_actual = dt_local.astimezone(timezone.utc)
                self.assertEqual(dt_utc_actual, dt_utc)

    def test_one_zone_dst(self):
        DST = ZoneOffset("DST", ONE_H, ONE_H)