New submission from Evan Fagerberg <[email protected]>:
Hello, I really like that this library allows for really strict mocking however
one thing I have noticed is that it seems like using spec on a mock does not
properly read the class body for attributes like some of the documentation
claims. For example this is a snippet of the Logger class in python 3.6's
`logging` module
```python
class Logger(Filterer):
name: str
level: int
parent: Union[Logger, PlaceHolder]
propagate: bool
handlers: List[Handler]
disabled: int
```
Now I want to mock that class ensuring that propagate gets set to False for
example
```python
from unittest import mock
from logging import Logger
logger = mock.Mock(spec_set=Logger)
logger.propagate = False
assert logger.propagate is False
*** AttributeError: Mock object has no attribute 'propagate'
```
I have noticed this does work when the value is initialized in the class body
so for example
```python
class Logger(Filterer):
name: str
level: int
parent: Union[Logger, PlaceHolder]
propagate: bool = False
handlers: List[Handler]
disabled: int
```
This would not fail with the test in question.
Wondering if this is intended behavior or not or if I am misunderstanding
something. I have tested this with Python 3.6.10, 3.8.2, all with the same
result.
----------
components: Tests
messages: 370712
nosy: efagerberg
priority: normal
severity: normal
status: open
title: spec_set/autospec/spec seems to not be reading attributes defined in
class body
type: behavior
versions: Python 3.6, Python 3.8, Python 3.9
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Python tracker <[email protected]>
<https://bugs.python.org/issue40864>
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