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diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md index 12f3efc09..50bb09470 100644 --- a/CONTRIBUTING.md +++ b/CONTRIBUTING.md @@ -75,7 +75,10 @@ See the [RPM build instructions](BUILD.md). We use [tox](http://readthedocs.org/docs/tox/) to manage virtualenvs and run tests. Alternatively, tests can be run using [detox](https://pypi.python.org/pypi/detox/) which allows for running tests in -parallel +parallel. + +Note: while `detox` may be useful in development to make use of multiple cores, +it can be buggy at times and produce flakes, thus we do not use it in our CI. ``` @@ -95,43 +98,90 @@ by `tox`: $ find . -path '*/bin/python' | grep -vF .tox ``` -Extraneous virtualenvs cause tools such as `pylint` to take a very long time -going through files that are part of the virtualenv. +The reason for this recommendation is that extraneous virtualenvs cause tools +such as `pylint` to take a very long time going through files that are part of +the virtualenv, and test discovery to go through lots of irrelevant files and +potentially fail. --- List the test environments available: + ``` tox -l ``` -Run all of the tests with: +Run all of the tests and linters with: + ``` tox ``` -Run all of the tests in parallel with detox: +Run all of the tests linters in parallel (may flake): + ``` detox ``` -Running a particular test environment (python 2.7 flake8 tests in this case): +### Run only unit tests or some specific linter + +Run a particular test environment (`flake8` on Python 2.7 in this case): + ``` tox -e py27-flake8 ``` -Running a particular test environment in a clean virtualenv (python 3.5 pylint -tests in this case): +Run a particular test environment in a clean virtualenv (`pylint` on Python 3.5 +in this case): + ``` -tox -r -e py35-pylint +tox -re py35-pylint ``` -If you want to enter the virtualenv created by tox to do additional +### Tricks + +#### Activating a virtualenv managed by tox + +If you want to enter a virtualenv created by tox to do additional testing/debugging (py27-flake8 env in this case): + ``` source .tox/py27-flake8/bin/activate ``` +#### Limiting the unit tests that are run + +During development, it might be useful to constantly run just a single test file +or test method, or to pass custom arguments to `pytest`: + +``` +tox -e py27-unit -- path/to/test/file.py +``` + +Anything after `--` is passed directly to `pytest`. To learn more about what +other flags you can use, try: + +``` +tox -e py27-unit -- -h +``` + +As a practical example, the snippet below shows how to list all tests in a +certain file, and then execute only one test of interest: + +``` +$ tox -e py27-unit -- roles/lib_openshift/src/test/unit/test_oc_project.py --collect-only --no-cov +... +collected 1 items +<Module 'roles/lib_openshift/src/test/unit/test_oc_project.py'> + <UnitTestCase 'OCProjectTest'> + <TestCaseFunction 'test_adding_a_project'> +... +$ tox -e py27-unit -- roles/lib_openshift/src/test/unit/test_oc_project.py -k test_adding_a_project +``` + +Among other things, this can be used for instance to see the coverage levels of +individual modules as we work on improving tests. + ## Submitting contributions 1. Go through the guides from the [introduction](#Introduction). |