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Remember that a mock's job is to say, "You got it, boss" whenever anyone calls
it. It will do real work, like raising an exception, when one of its
convenience methods is called, like assert_called_once_with
. But it won't
do real work when you call a method that only resembles a convenience method,
such as assert_called_once
(no _with
!). Sometimes developers may not
notice that they are using a non-existent mock method, because they are not
getting an output error telling them so. And for some reason they can also
forget to verify that the test cases fail before writing implementation code.
This plugin checks for possible non-existent mock methods when you run
flake8
, the Python code checker.
Inspired by http://engineeringblog.yelp.com/2015/02/assert_called_once-threat-or-menace.html.
Includes edits from
You can install or upgrade flake8-mock
with these commands::
$ pip install flake8-mock $ pip install --upgrade flake8-mock
When both flake8 3.5.0
and flake8-mock
are installed, the plugin is
available in flake8
::
$ flake8 --version
3.5.0 (flake8-mock: 0.4, pyflakes: 0.8.1)
Once you run flake8, you can have something like::
$ flake8 test_file.py
test_file.py:55:5: M201 called_once is a non-existent mock property
test_file.py:56:5: M200 called_once_with is a non-existent mock method
* Alejandro Gabriel Pereira is the original author.
* Ania Warzecha has rewritten it for flake8 3 and with support for more methods
0.4 (24-11-2018)
* Added `has_calls` to checked methods
* Added a check for not existent properties on mocks
* Added compatibility for flake8 3.x
* Added tests
0.3 (09-10-2016)
assert_not_called
, assert_called
or assert_called_once
.0.2 (12-16-2015)
* Add Python 3 compatibility.
0.1 (10-20-2015)
0.1dev0 (10-19-2015)
* First dev release.
FAQs
Provides checking for non-existent mock methods and properties
We found that flake8-mock-x2 demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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