Method test_from_file

Lib/test/test_zoneinfo/test_zoneinfo.py:1729–1746

(self)

                    self.assertIsNot(zi_rt, zi_cache)

    def test_from_file(self):
        key = "Europe/Dublin"
        with open(self.zoneinfo_data.path_from_key(key), "rb") as f:
            zi_nokey = self.klass.from_file(f)

            f.seek(0)
            zi_key = self.klass.from_file(f, key=key)

        test_cases = [
            (zi_key, "ZoneInfo with key"),
            (zi_nokey, "ZoneInfo without key"),
        ]

        for zi, test_name in test_cases:
            for proto in range(pickle.HIGHEST_PROTOCOL + 1):
                with self.subTest(test_name=test_name, proto=proto):
                    with self.assertRaises(pickle.PicklingError):
                        pickle.dumps(zi, protocol=proto)

    def test_pickle_after_from_file(self):
        # This may be a bit of paranoia, but this test is to ensure that no