Method test_fromtimestamp_limits

Lib/test/datetimetester.py:2884–2921

(self)

    @unittest.skipIf(sys.platform == "win32", "Windows doesn't support min timestamp")
    def test_fromtimestamp_limits(self):
        try:
            self.theclass.fromtimestamp(-2**32 - 1)
        except (OSError, OverflowError):
            self.skipTest("Test not valid on this platform")

        # XXX: Replace these with datetime.{min,max}.timestamp() when we solve
        # the issue with gh-91012
        min_dt = self.theclass.min + timedelta(days=1)
        min_ts = min_dt.timestamp()

        max_dt = self.theclass.max.replace(microsecond=0)
        max_ts = ((self.theclass.max - timedelta(hours=23)).timestamp() +
                  timedelta(hours=22, minutes=59, seconds=59).total_seconds())

        for (test_name, ts, expected) in [
                ("minimum", min_ts, min_dt),
                ("maximum", max_ts, max_dt),
        ]:
            with self.subTest(test_name, ts=ts, expected=expected):
                actual = self.theclass.fromtimestamp(ts)

                self.assertEqual(actual, expected)

        # Test error conditions
        test_cases = [
            ("Too small by a little", min_ts - timedelta(days=1, hours=12).total_seconds()),
            ("Too small by a lot", min_ts - timedelta(days=400).total_seconds()),
            ("Too big by a little", max_ts + timedelta(days=1).total_seconds()),
            ("Too big by a lot", max_ts + timedelta(days=400).total_seconds()),
        ]

        for test_name, ts in test_cases:
            with self.subTest(test_name, ts=ts):
                with self.assertRaises((ValueError, OverflowError)):
                    # converting a Python int to C time_t can raise a
                    # OverflowError, especially on 32-bit platforms.
                    self.theclass.fromtimestamp(ts)

    @unittest.skipIf(sys.platform == "win32", "Windows doesn't support min timestamp")
    def test_utcfromtimestamp_limits(self):