This little IPython extension gives you the ability to run tests using Pytest in an IPython Notebook.
Note: There are now better and more actively maintained tools to achieve this. There was also a rejected Pytest feature request for supporting notebooks - see the discussion for interesting details about this challenge:
Pytest issue #2268_See also testbook_ for adding separate unit tests for a notebook.
The motivation for the extension was to make it possible to demonstrate test-driven development using pytest in an IPython notebook driven presentation.
This extension does not attempt to enable using notebooks as test suites. The intention is also not to collect test results from multiple cells, but to do separate test runs for cells in an interactive presentation.
This extension attempts to achieve for pytest_ what the
ipythonnose extension does for nose_. Unfortunately it isn't able
to inject globals from the notebook environment into the test like the
%%nose cell magic in ipython_nose_. Instead, in
ipython_pytest, all imports, constants and helper functions need
to be contained in the test cell itself.
.. _jupyter-pytest-2: https://github.com/sashgorokhov/jupyter-pytest-2 .. _ipytest: https://github.com/chmp/ipytest .. _pytest_exploratory: https://pytest-exploratory.readthedocs.io/ .. _Pytest issue #2268: https://github.com/pytest-dev/pytest/issues/2268 .. _testbook: https://testbook.readthedocs.io/en/latest/ .. _pytest: https://pytest.org/ .. _ipython_nose: https://github.com/taavi/ipython_nose .. _cell magic in ipython_nose: https://github.com/taavi/ipython_nose/pull/11/files .. _nose: https://nose.readthedocs.io/
Make sure your IPython Notebook server can import ipython_pytest.py (e.g.
copy it to a directory in your PYTHONPATH, or modify PYTHONPATH
before starting IPython Notebook). It's also probably sufficient to have
ipython_pytest.py in the directory from which you run the notebook, e.g.::
$ ls ipython_pytest.py $ ipython notebook
You can also install it in a virtualenv in development mode::
$ cd ipython-pytest $ pip install -e .
Add a cell containing::
%load_ext ipython_pytest
somewhere in your notebook.
Write tests that conform to Pytest conventions, e.g.::
def test_arithmetic(): assert 1+1 == 2
Add a cell consisting of::
%%pytest
def test_my_stuff(): assert 42 == 42
to your notebook and run that cell. That will discover your
test_* functions, run them, and show console output from
Pytest.
Pass standard Pytest arguments to the magic::
%%pytest --tb=short
Thanks to Taavi Burns for the idea in his ipythonnose package.
::
git clone https://github.com/akaihola/ipython_pytest.git
Copyright (c) 2016, 2018, Antti Kaihola.
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