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gh-94808: Cover PyObject_PyBytes case with custom __bytes__ method #96610

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merged 2 commits into from
Oct 6, 2022
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gh-94808: Cover PyObject_PyBytes case with custom __bytes__ method #96610

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gh-94808: Cover `PyObject_PyBytes` case with custom `__bytes__` method
sobolevn Sep 6, 2022
27d5e5c
Update Lib/test/test_long.py
sobolevn Oct 6, 2022
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16 changes: 16 additions & 0 deletions Lib/test/test_long.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1518,6 +1518,22 @@ def __init__(self, value):
self.assertEqual(i, 1)
self.assertEqual(getattr(i, 'foo', 'none'), 'bar')

class ValidBytes:
def __bytes__(self):
return b'\x01'
class InvalidBytes:
def __bytes__(self):
return 'abc'
class MissingBytes: ...
class RaisingBytes:
def __bytes__(self):
1 / 0

self.assertEqual(int.from_bytes(ValidBytes()), 1)
self.assertRaises(TypeError, int.from_bytes, InvalidBytes)
self.assertRaises(TypeError, int.from_bytes, MissingBytes)
self.assertRaises(TypeError, int.from_bytes, RaisingBytes)
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This shouldn't raise TypeError:

>>> class RaisingBytes:
...             def __bytes__(self):
...                 1 / 0
... 
>>> int.from_bytes(RaisingBytes())
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 3, in __bytes__
ZeroDivisionError: division by zero

And yet CI is green. Am I missing something? I'm compiling your PR locally now to see what's going on.

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Ah it's because you don't instantiate the class.

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Oh, Good catch! Even I missed this.

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@support.cpython_only
def test_from_bytes_small(self):
# bpo-46361
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