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gh-130718: Normalize edge cases in datetime.timestamp and datetime.astimezone #130752

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gh-130718: Normalize edge cases in datetime.timestamp and datetime.astimezone #130752

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Add checks for edge cases in `datetime.timestamp` and `datetime.astim…
donBarbos Mar 2, 2025
c836cb3
Add tests
donBarbos Mar 2, 2025
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Add Py_DECREF
donBarbos Mar 2, 2025
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donBarbos Mar 3, 2025
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Merge branch 'main' into issue-130718
donBarbos Mar 16, 2025
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Add tests
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@donBarbos
donBarbos committed Mar 2, 2025
commit c836cb3dcbc19533e7c93f438b6fc3c6d968c256
12 changes: 12 additions & 0 deletions 12 Lib/test/datetimetester.py
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Expand Up @@ -3122,6 +3122,18 @@ def dst(self, dt): return 1
with self.assertRaises(TypeError):
dt_broken.astimezone()

dt_big = self.theclass(9999, 12, 31, 23, 59, 59)
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I don't love that the original style violates the one-assert-per-test style, and we should probably not continue that.

Let's move this into its own method, like test_astimezone_max and test_astimezone_min. We can test the values near datetime.min and datetime.max separately, and use self.subTest to try a few different values for time zone.

I'm not sure if @support.run_with_tz can be parameterized, but if it can we should try it on a few different time zones.

dt_big_utc = dt_big.replace(hour=19,
tzinfo=timezone(timedelta(hours=-4), 'EDT'))
self.assertEqual(dt_big_utc,
dt_big.replace(tzinfo=timezone.utc).astimezone())

other_tz = timezone(timedelta(hours=+4), '+04')
dt_other_tz = dt_big.replace(tzinfo=other_tz)
dt_utc_tz = dt_big.replace(tzinfo=timezone.utc)
self.assertEqual(dt_other_tz, dt_other_tz.astimezone(tz=other_tz))
self.assertEqual(dt_utc_tz, dt_utc_tz.astimezone(tz=timezone.utc))

def test_subclass_datetime(self):

class C(self.theclass):
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