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For every new feature, unit tests should be created that both test and (implicitly) document the usage of said feature. If submitting a patch for a bug that had no unit test, a new passing unit test should be added. If a submitted bug fix does have a unit test, be sure to add a new one that fails without the patch and passes with the patch.
For more information on creating unit tests and utilizing the testing infrastructure in OpenStack Nova, please read
The testing system is based on a combination of tox and stestr. The canonical approach to running tests is to simply run the command
tox. This will create virtual environments, populate them with dependencies and run all of the tests that OpenStack CI systems run. Behind the scenes, tox is running
stestr run, but is set up such that you can supply any additional stestr arguments that are needed to tox. For example, you can run:
tox -- --analyze-isolation to cause tox to tell stestr to add --analyze-isolation to its argument list.
Python packages may also have dependencies that are outside of tox's ability to install. Please refer to Development Quickstart for a list of those packages on Ubuntu, Fedora and Mac OS X.
To run a single or restricted set of tests, pass a regex that matches the class name containing the tests as an extra
tox argument; e.g.
tox -- TestWSGIServer (note the double-hypen) will test all WSGI server tests from
-- TestWSGIServer.test_uri_length_limit would run just that test, and
-- TestWSGIServer|TestWSGIServerWithSSL would run tests from both classes.
It is also possible to run the tests inside of a virtual environment you have created, or it is possible that you have all of the dependencies installed locally already. In this case, you can interact with the stestr command directly. Running
stestr run will run the entire test suite.
stestr run --concurrency=1 will run tests serially (by default, stestr runs tests in parallel). More information about stestr can be found at: http://stestr.readthedocs.io/
Since when testing locally, running the entire test suite on a regular basis is prohibitively expensive, the
tools/run-tests-for-diff.sh script is provided as a convenient way to run selected tests using output from
git diff. For example, this allows running only the test files changed/added in the working tree:
However since it passes its arguments directly to
git diff, tests can be selected in lots of other interesting ways, e.g. it can run all tests affected by a single commit at the tip of a given branch:
or all those affected by a range of commits, e.g. a branch containing a whole patch series for a blueprint:
It supports the same
-HEAD invocation syntax as
flake8wrap.sh (as used by the
fast8 tox environment):
By default tests log at
INFO level. It is possible to make them log at
DEBUG level by exporting the
OS_DEBUG environment variable to
Normal Sphinx docs can be built via the setuptools
build_sphinx command. To do this via
tox, simply run
tox -e docs, which will cause a virtualenv with all of the needed dependencies to be created and then inside of the virtualenv, the docs will be created and put into doc/build/html.
If you'd like a PDF of the documentation, you'll need LaTeX and ImageMagick installed, and additionally some fonts. On Ubuntu systems, you can get what you need with:
apt-get install texlive-full imagemagick
Then you can use the
build_latex_pdf.sh script in tools/ to take care of both the sphinx latex generation and the latex compilation. For example:
The script must be run from the root of the Nova repository and it'll copy the output pdf to Nova.pdf in that directory.