.. _wiki_adding_tests:

============
Adding Tests
============

We will now add tests for the models and the views and a few functional tests
in ``tests.py``.  Tests ensure that an application works, and that it
continues to work when changes are made in the future.

Test the models
===============

We write tests for the ``model`` classes and the ``appmaker``.  Changing
``tests.py``, we'll write a separate test class for each ``model`` class, and
we'll write a test class for the ``appmaker``.

To do so, we'll retain the ``tutorial.tests.ViewTests`` class that was
generated from choosing the ``zodb`` backend option.  We'll add three test
classes: one for the ``Page`` model named ``PageModelTests``, one for the
``Wiki`` model named ``WikiModelTests``, and one for the appmaker named
``AppmakerTests``.

Test the views
==============

We'll modify our ``tests.py`` file, adding tests for each view function we
added previously.  As a result, we'll delete the ``ViewTests`` class that the
``zodb`` backend option provided, and add four other test classes:
``ViewWikiTests``, ``ViewPageTests``, ``AddPageTests``, and ``EditPageTests``.
These test the ``view_wiki``, ``view_page``, ``add_page``, and ``edit_page``
views.

Functional tests
================

We'll test the whole application, covering security aspects that are not
tested in the unit tests, like logging in, logging out, checking that
the ``viewer`` user cannot add or edit pages, but the ``editor`` user
can, and so on.

View the results of all our edits to ``tests.py``
=================================================

Open the ``tutorial/tests.py`` module, and edit it such that it appears as
follows:

.. literalinclude:: src/tests/tutorial/tests.py
    :linenos:
    :language: python

Running the tests
=================

We can run these tests by using ``pytest`` similarly to how we did in
:ref:`running_tests`. Courtesy of the cookiecutter, our testing dependencies have
already been satisfied and ``pytest`` and coverage have already been
configured, so we can jump right to running tests.

On Unix:

.. code-block:: bash

    $VENV/bin/pytest -q

On Windows:

.. code-block:: doscon

    %VENV%\Scripts\pytest -q

The expected result should look like the following:

.. code-block:: text

    .........................
    25 passed in 6.87 seconds