Create step-wise / incremental tests in pytest.

This is the readme for developers. The documentation for users is available here: https://smarie.github.io/python-pytest-steps/

Contributions are welcome ! Simply fork this project on github, commit your contributions, and create pull requests.

Here is a non-exhaustive list of interesting open topics: https://github.com/smarie/python-pytest-steps/issues

This project uses nox to define all lifecycle tasks. In order to be able to run those tasks, you should create python 3.7 environment and install the requirements:

>>> conda create -n noxenv python="3.7"
>>> activate noxenv
(noxenv) >>> pip install -r noxfile-requirements.txt

You should then be able to list all available tasks using:

>>> nox --list
Sessions defined in <path>\noxfile.py:

* tests-2.7 -> Run the test suite, including test reports generation and coverage reports.
* tests-3.5 -> Run the test suite, including test reports generation and coverage reports.
* tests-3.6 -> Run the test suite, including test reports generation and coverage reports.
* tests-3.8 -> Run the test suite, including test reports generation and coverage reports.
* tests-3.7 -> Run the test suite, including test reports generation and coverage reports.
- docs-3.7 -> Generates the doc and serves it on a local http server. Pass '-- build' to build statically instead.
- publish-3.7 -> Deploy the docs+reports on github pages. Note: this rebuilds the docs
- release-3.7 -> Create a release on github corresponding to the latest tag

This project uses pytest so running pytest at the root folder will execute all tests on current environment. However it is a bit cumbersome to manage all requirements by hand ; it is easier to use nox to run pytest on all supported python environments with the correct package requirements:

nox

Tests and coverage reports are automatically generated under ./docs/reports for one of the sessions (tests-3.7).

If you wish to execute tests on a specific environment, use explicit session names, e.g. nox -s tests-3.6.

This project uses mkdocs to generate its documentation page. Therefore building a local copy of the doc page may be done using mkdocs build -f docs/mkdocs.yml. However once again things are easier with nox. You can easily build and serve locally a version of the documentation site using:

>>> nox -s docs
nox > Running session docs-3.7
nox > Creating conda env in .nox\docs-3-7 with python=3.7
nox > [docs] Installing requirements with pip: ['mkdocs-material', 'mkdocs', 'pymdown-extensions', 'pygments']
nox > python -m pip install mkdocs-material mkdocs pymdown-extensions pygments
nox > mkdocs serve -f ./docs/mkdocs.yml
INFO    -  Building documentation...
INFO    -  Cleaning site directory
INFO    -  The following pages exist in the docs directory, but are not included in the "nav" configuration:
  - long_description.md
INFO    -  Documentation built in 1.07 seconds
INFO    -  Serving on http://127.0.0.1:8000
INFO    -  Start watching changes
...

While this is running, you can edit the files under ./docs/ and browse the automatically refreshed documentation at the local http://127.0.0.1:8000 page.

Once you are done, simply hit <CTRL+C> to stop the session.

Publishing the documentation (including tests and coverage reports) is done automatically by the continuous integration engine, using the nox -s publish session, this is not needed for local development.

This project uses setuptools_scm to synchronise the version number. Therefore the following command should be used for development snapshots as well as official releases: python setup.py sdist bdist_wheel. However this is not generally needed since the continuous integration engine does it automatically for us on git tags. For reference, this is done in the nox -s release session.

Ax explained in github ('get commandline instructions'):

git checkout -b <git_name>-<feature_branch> main
git pull https://github.com/<git_name>/python-pytest-steps.git <feature_branch> --no-commit --ff-only

if the second step does not work, do a normal auto-merge (do not use rebase!):

git pull https://github.com/<git_name>/python-pytest-steps.git <feature_branch> --no-commit

Finally review the changes, possibly perform some modifications, and commit.