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102 lines
3.7 KiB
ReStructuredText
102 lines
3.7 KiB
ReStructuredText
.. _test_plugins:
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Test plugins
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=============
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.. contents::
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:local:
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:depth: 2
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Test plugins evaluate template expressions and return True or False. With test plugins you can create :ref:`conditionals <playbooks_conditionals>` to implement the logic of your tasks, blocks, plays, playbooks, and roles. Ansible uses the `standard tests `_ shipped as part of Jinja, and adds some specialized test plugins. You can :ref:`create custom Ansible test plugins <developing_test_plugins>`.
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.. _enabling_test:
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Enabling test plugins
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----------------------
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You can add a custom test plugin by dropping it into a ``test_plugins`` directory adjacent to your play, inside a role, or by putting it in one of the test plugin directory sources configured in :ref:`ansible.cfg <ansible_configuration_settings>`.
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.. _using_test:
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Using test plugins
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-------------------
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You can use tests anywhere you can use templating in Ansible: in a play, in variables file, or in a Jinja2 template for the :ref:`template <template_module>` module. For more information on using test plugins, see :ref:`playbooks_tests`.
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Tests always return ``True`` or ``False``, they are always a boolean, if you need a different return type, you should be looking at filters.
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You can recognize test plugins by the use of the ``is`` statement in a template, they can also be used as part of the ``select`` family of filters.
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.. code-block:: YAML+Jinja
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vars:
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is_ready: '{{ task_result is success }}'
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tasks:
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- name: conditionals are always in 'template' context
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action: dostuff
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when: task_result is failed
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Tests will always have an ``_input`` and this is normally what is on the left side of ``is``. Tests can also take additional parameters as you would to most programming functions. These parameters can be either ``positional`` (passed in order) or ``named`` (passed as key=value pairs). When passing both types, positional arguments should go first.
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.. code-block:: YAML+Jinja
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tasks:
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- name: pass positional parameter to match test
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action: dostuff
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when: myurl is match("https://example.com/users/.*/resources")
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- name: pass named parameter to truthy test
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action: dostuff
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when: myvariable is truthy(convert_bool=True)
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- name: pass both types to 'version' test
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action: dostuff
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when: sample_semver_var is version('2.0.0-rc.1+build.123', 'lt', version_type='semver')
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Using test plugins with lists
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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As mentioned above, one way to use tests is with the ``select`` familiy of filters (``select``, ``reject``, ``selectattr``, ``rejectattr``).
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.. code-block:: YAML+Jinja
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# give me only defined variables from a list of variables, using 'defined' test
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good_vars: "{{ all_vars|select('defined') }}"
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# this uses the 'equalto' test to filter out non 'fixed' type of addresses from a list
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only_fixed_addresses: "{{ all_addresses|selectattr('type', 'equalsto', 'fixed') }}"
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# this does the opposite of the previous one
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only_fixed_addresses: "{{ all_addresses|rejectattr('type', 'equalsto', 'fixed') }}"
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Plugin list
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-----------
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You can use ``ansible-doc -t filter -l`` to see the list of available plugins. Use ``ansible-doc -t filter <plugin name>`` to see specific documents and examples.
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.. seealso::
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:ref:`about_playbooks`
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An introduction to playbooks
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:ref:`playbooks_tests`
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Using tests
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:ref:`playbooks_conditionals`
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Using conditional statements
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:ref:`filter_plugins`
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Filter plugins
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:ref:`playbooks_tests`
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Using tests
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:ref:`lookup_plugins`
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Lookup plugins
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`User Mailing List <https://groups.google.com/group/ansible-devel>`_
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Have a question? Stop by the google group!
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:ref:`communication_irc`
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How to join Ansible chat channels
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