New submission from Barry McLarnon <[email protected]>:
The error handling in mock.decorate_callable (3.5-3.7) and
mock.decoration_helper (3.8-3.9) is incorrectly implemented. If the error
handler is triggered in the loop, the `patching` variable is out of scope and
raises an unhandled `UnboundLocalError` instead.
This happened as a result of a 3rd-party library that attempts to clear the
`patchings` list of a decorated function. The below code shows a recreation of
the incorrect error handling:
import functools
from unittest import mock
def is_valid():
return True
def mock_is_valid():
return False
def decorate(f):
@functools.wraps(f)
def decorate_wrapper(*args, **kwargs):
# This happens in a 3rd-party library
f.patchings = []
return f(*args, **kwargs)
return decorate_wrapper
@decorate
@mock.patch('test.is_valid', new=mock_is_valid)
def test_patch():
raise Exception()
----------
components: Tests
messages: 365395
nosy: bmclarnon
priority: normal
severity: normal
status: open
title: Incorrect error handling in unittest.mock
type: behavior
versions: Python 3.5, Python 3.6, Python 3.7, Python 3.8, Python 3.9
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Python tracker <[email protected]>
<https://bugs.python.org/issue40126>
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