Django comes with a test suite of its own, in the tests directory of the code base. It’s our policy to make sure all tests pass at all times.
The tests cover:
- Models, the database API and everything else in core Django core (tests/),
- Contrib apps (django/contrib/<app>/tests or tests/<app>_...).
We appreciate any and all contributions to the test suite!
The Django tests all use the testing infrastructure that ships with Django for testing applications. See Writing and running tests for an explanation of how to write new tests.
Running the unit tests¶
Running the tests requires a Django settings module that defines the databases to use. To make it easy to get started, Django provides and uses a sample settings module that uses the SQLite database. To run the tests:
$ git clone https://github.com/django/django.git django-repo $ cd django-repo/tests $ PYTHONPATH=..:$PYTHONPATH ./runtests.py
Older versions of Django required specifying a settings file:
$ PYTHONPATH=..:$PYTHONPATH python ./runtests.py --settings=test_sqlite
runtests.py now uses test_sqlite by default if settings aren’t provided through either --settings or DJANGO_SETTINGS_MODULE.
You can avoid typing the PYTHONPATH bit each time by adding your Django checkout to your PYTHONPATH or by installing the source checkout using pip. See Installing the development version.
Having problems? See Troubleshooting for some common issues.
Using another settings module¶
The included settings module allows you to run the test suite using SQLite. If you want to test behavior using a different database (and if you’re proposing patches for Django, it’s a good idea to test across databases), you may need to define your own settings file.
To run the tests with different settings, ensure that the module is on your PYTHONPATH and pass the module with --settings.
The DATABASES setting in any test settings module needs to define two databases:
- A default database. This database should use the backend that you want to use for primary testing
- A database with the alias other. The other database is used to establish that queries can be directed to different databases. As a result, this database can use any backend you want. It doesn’t need to use the same backend as the default database (although it can use the same backend if you want to). It cannot be the same database as the default.
If you’re using a backend that isn’t SQLite, you will need to provide other details for each database:
- The USER option needs to specify an existing user account for the database. That user needs permission to execute CREATE DATABASE so that the test database can be created.
- The PASSWORD option needs to provide the password for the USER that has been specified.
Before Django 1.7, the NAME setting was mandatory and had to be the name of an existing database to which the given user had permission to connect.
You will also need to ensure that your database uses UTF-8 as the default character set. If your database server doesn’t use UTF-8 as a default charset, you will need to include a value for TEST_CHARSET in the settings dictionary for the applicable database.
Running only some of the tests¶
Django’s entire test suite takes a while to run, and running every single test could be redundant if, say, you just added a test to Django that you want to run quickly without running everything else. You can run a subset of the unit tests by appending the names of the test modules to runtests.py on the command line.
For example, if you’d like to run tests only for generic relations and internationalization, type:
$ ./runtests.py --settings=path.to.settings generic_relations i18n
How do you find out the names of individual tests? Look in tests/ — each directory name there is the name of a test. Contrib app names are also valid test names.
If you just want to run a particular class of tests, you can specify a list of paths to individual test classes. For example, to run the TranslationTests of the i18n module, type:
$ ./runtests.py --settings=path.to.settings i18n.tests.TranslationTests
Going beyond that, you can specify an individual test method like this:
$ ./runtests.py --settings=path.to.settings i18n.tests.TranslationTests.test_lazy_objects
Running the Selenium tests¶
Some admin tests require Selenium 2, Firefox and Python >= 2.6 to work via a real Web browser. To allow those tests to run and not be skipped, you must install the selenium package (version > 2.13) into your Python path and run the tests with the --selenium option:
$ ./runtests.py --settings=test_sqlite --selenium admin_inlines
Running all the tests¶
If you want to run the full suite of tests, you’ll need to install a number of dependencies:
- memcached, plus a supported Python binding
- gettext (gettext on Windows)
You can find these dependencies in pip requirements files inside the tests/requirements directory of the Django source tree and install them like so:
$ pip install -r tests/requirements/py2.txt # Python 3: py3.txt
You can also install the database adapter(s) of your choice using oracle.txt, mysql.txt, or postgres.txt.
If you want to test the memcached cache backend, you’ll also need to define a CACHES setting that points at your memcached instance.
To run the GeoDjango tests, you will need to setup a spatial database and install the Geospatial libraries.
Each of these dependencies is optional. If you’re missing any of them, the associated tests will be skipped.
Contributors are encouraged to run coverage on the test suite to identify areas that need additional tests. The coverage tool installation and use is described in testing code coverage.
To run coverage on the Django test suite using the standard test settings:
$ coverage run ./runtests.py --settings=test_sqlite
After running coverage, generate the html report by running:
$ coverage html
When running coverage for the Django tests, the included .coveragerc settings file defines coverage_html as the output directory for the report and also excludes several directories not relevant to the results (test code or external code included in Django).
Tests for contrib apps go in their respective directories under django/contrib, in a tests.py file. You can split the tests over multiple modules by using a tests directory in the normal Python way.
If you have URLs that need to be mapped, put them in tests/urls.py.
To run tests for just one contrib app (e.g. auth), use the same method as above:
$ ./runtests.py --settings=settings django.contrib.auth