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gh-109956: Also test typing.NamedTuple with copy.replace #109957

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Merged
merged 3 commits into from
Oct 3, 2023
Merged

gh-109956: Also test typing.NamedTuple with copy.replace #109957

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2bb84a0
gh-109956: Also test `typing.NamedTuple` with `copy.replace`
sobolevn Sep 27, 2023
8452d94
Address review
sobolevn Sep 29, 2023
2e3db6f
Update Lib/test/test_copy.py
serhiy-storchaka Oct 3, 2023
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26 changes: 18 additions & 8 deletions Lib/test/test_copy.py
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Original file line number Diff line number Diff line change
Expand Up @@ -936,14 +936,24 @@ def __replace__(self, **changes):

def test_namedtuple(self):
from collections import namedtuple
Point = namedtuple('Point', 'x y', defaults=(0,))
p = Point(11, 22)
self.assertEqual(copy.replace(p), (11, 22))
self.assertEqual(copy.replace(p, x=1), (1, 22))
self.assertEqual(copy.replace(p, y=2), (11, 2))
self.assertEqual(copy.replace(p, x=1, y=2), (1, 2))
with self.assertRaisesRegex(ValueError, 'unexpected field name'):
copy.replace(p, x=1, error=2)
from typing import NamedTuple
PointFromCall = namedtuple('Point', 'x y', defaults=(0,))
class PointFromInheritance(PointFromCall):
pass
class PointFromClass(NamedTuple):
x: int
y: int = 0
for Point in (PointFromCall, PointFromInheritance, PointFromClass):
with self.subTest(Point=Point):
p = Point(11, 22)
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Should we test the class?

Suggested change
p = Point(11, 22)
p = Point(11, 22)
assert isinstance(copy.replace(p, x=12), Point)

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Why not? :)
Done.

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Oh I meant to test the copy, not the original p!

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I did not notice this conversation (I can't see the text few lines above the line I'm looking at), but I added a test for a copy just before merging. I was puzzled as to why the test for the original was added, but decided not to drag the review out.

self.assertIsInstance(p, Point)
self.assertEqual(copy.replace(p), (11, 22))
self.assertIsInstance(copy.replace(p), Point)
self.assertEqual(copy.replace(p, x=1), (1, 22))
self.assertEqual(copy.replace(p, y=2), (11, 2))
self.assertEqual(copy.replace(p, x=1, y=2), (1, 2))
with self.assertRaisesRegex(ValueError, 'unexpected field name'):
copy.replace(p, x=1, error=2)

def test_dataclass(self):
from dataclasses import dataclass
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