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[3.14] gh-143866: Verify return value of `pathlib.write_{bytes,text}` methods in tests (GH-143870) by miss-islington · Pull Request #144029 · python/cpython · GitHub

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[3.14] gh-143866: Verify return value of pathlib.write_{bytes,text} methods in tests (GH-143870) #144029

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Merged
sobolevn merged 1 commit into from
Jan 19, 2026
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[3.14] gh-143866: Verify return value of pathlib.write_{bytes,text} methods in tests (GH-143870) #144029

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10 changes: 6 additions & 4 deletions Lib/test/test_pathlib/test_write.py
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Original file line number Diff line number Diff line change
Expand Up @@ -59,15 +59,17 @@ def test_open_wb(self):

def test_write_bytes(self):
p = self.root / 'fileA'
p.write_bytes(b'abcdefg')
self.assertEqual(self.ground.readbytes(p), b'abcdefg')
data = b'abcdefg'
self.assertEqual(len(data), p.write_bytes(data))
self.assertEqual(self.ground.readbytes(p), data)
# Check that trying to write str does not truncate the file.
self.assertRaises(TypeError, p.write_bytes, 'somestr')
self.assertEqual(self.ground.readbytes(p), b'abcdefg')
self.assertEqual(self.ground.readbytes(p), data)

def test_write_text(self):
p = self.root / 'fileA'
p.write_text('äbcdefg', encoding='latin-1')
data = 'äbcdefg'
self.assertEqual(len(data), p.write_text(data, encoding='latin-1'))
self.assertEqual(self.ground.readbytes(p), b'\xe4bcdefg')
# Check that trying to write bytes does not truncate the file.
self.assertRaises(TypeError, p.write_text, b'somebytes', encoding='utf-8')
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