Nova Style Commandments ======================= - Step 1: Read the OpenStack Style Commandments https://github.com/openstack-dev/hacking/blob/master/HACKING.rst - Step 2: Read on Nova Specific Commandments --------------------------- - ``nova.db`` imports are not allowed in ``nova/virt/*`` - [N309] no db session in public API methods (disabled) This enforces a guideline defined in ``nova.openstack.common.db.sqlalchemy.session`` - [N310] timeutils.utcnow() wrapper must be used instead of direct calls to datetime.datetime.utcnow() to make it easy to override its return value in tests Creating Unit Tests ------------------- 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 ``nova/tests/README.rst``. Running Tests ------------- The testing system is based on a combination of tox and testr. 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 ``testr run --parallel``, but is set up such that you can supply any additional testr arguments that are needed to tox. For example, you can run: ``tox -- --analyze-isolation`` to cause tox to tell testr to add --analyze-isolation to its argument list. 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 testr command directly. Running ``testr run`` will run the entire test suite. ``testr run --parallel`` will run it in parallel (this is the default incantation tox uses.) More information about testr can be found at: http://wiki.openstack.org/testr Building Docs ------------- Normal Sphinx docs can be built via the setuptools ``build_sphinx`` command. To do this via ``tox``, simply run ``tox -evenv -- python setup.py build_sphinx``, 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 installed, and additionally some fonts. On Ubuntu systems, you can get what you need with:: apt-get install texlive-latex-recommended texlive-latex-extra texlive-fonts-recommended Then run ``build_sphinx_latex``, change to the build dir and run ``make``. Like so:: tox -evenv -- python setup.py build_sphinx_latex cd build/sphinx/latex make You should wind up with a PDF - Nova.pdf.