Installing and Using plugins

This section talks about installing and using third party plugins. For writing your own plugins, please refer to Writing plugins.

Installing a third party plugin can be easily done with pip:

pip install pytest-NAME
pip uninstall pytest-NAME

If a plugin is installed, pytest automatically finds and integrates it, there is no need to activate it.

Here is a little annotated list for some popular plugins:

To see a complete list of all plugins with their latest testing status against different py.test and Python versions, please visit plugincompat.

You may also discover more plugins through a pytest- pypi.python.org search.

Requiring/Loading plugins in a test module or conftest file

You can require plugins in a test module or a conftest file like this:

pytest_plugins = "myapp.testsupport.myplugin",

When the test module or conftest plugin is loaded the specified plugins will be loaded as well.

pytest_plugins = “myapp.testsupport.myplugin”

which will import the specified module as a pytest plugin.

Finding out which plugins are active

If you want to find out which plugins are active in your environment you can type:

py.test --trace-config

and will get an extended test header which shows activated plugins and their names. It will also print local plugins aka conftest.py files when they are loaded.

Deactivating / unregistering a plugin by name

You can prevent plugins from loading or unregister them:

py.test -p no:NAME

This means that any subsequent try to activate/load the named plugin will not work.

If you want to unconditionally disable a plugin for a project, you can add this option to your pytest.ini file:

[pytest]
addopts = -p no:NAME

Alternatively to disable it only in certain environments (for example in a CI server), you can set PYTEST_ADDOPTS environment variable to -p no:name.

See Finding out which plugins are active for how to obtain the name of a plugin.

Pytest default plugin reference

You can find the source code for the following plugins in the pytest repository.

_pytest.assertion support for presenting detailed information in failing assertions.
_pytest.cacheprovider merged implementation of the cache provider
_pytest.capture per-test stdout/stderr capturing mechanism.
_pytest.config command line options, ini-file and conftest.py processing.
_pytest.doctest discover and run doctests in modules and test files.
_pytest.genscript (deprecated) generate a single-file self-contained version of pytest
_pytest.helpconfig version info, help messages, tracing configuration.
_pytest.junitxml report test results in JUnit-XML format,
_pytest.mark generic mechanism for marking and selecting python functions.
_pytest.monkeypatch monkeypatching and mocking functionality.
_pytest.nose run test suites written for nose.
_pytest.pastebin submit failure or test session information to a pastebin service.
_pytest.pdb
_pytest.pytester (disabled by default) support for testing pytest and pytest plugins.
_pytest.python Python test discovery, setup and run of test functions.
_pytest.recwarn recording warnings during test function execution.
_pytest.resultlog log machine-parseable test session result information in a plain
_pytest.runner basic collect and runtest protocol implementations
_pytest.main core implementation of testing process: init, session, runtest loop.
_pytest.skipping support for skip/xfail functions and markers.
_pytest.terminal terminal reporting of the full testing process.
_pytest.tmpdir support for providing temporary directories to test functions.
_pytest.unittest discovery and running of std-library “unittest” style tests.