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<section class="tex2jax_ignore mathjax_ignore" id="unit-testing">
<h1>Unit Testing<a class="headerlink" href="#unit-testing" title="Permalink to this headline"></a></h1>
<p><em>Unit testing</em> means testing components of a program in isolation from each other to make sure every
part works on its own before using it with others. Extensive testing helps avoid new updates causing
unexpected side effects as well as alleviates general code rot (a more comprehensive wikipedia
article on unit testing can be found <a class="reference external" href="https://en.wikipedia.org/wiki/Unit_test">here</a>).</p>
<p>A typical unit test set calls some function or method with a given input, looks at the result and
makes sure that this result looks as expected. Rather than having lots of stand-alone test programs,
Evennia makes use of a central <em>test runner</em>. This is a program that gathers all available tests all
over the Evennia source code (called <em>test suites</em>) and runs them all in one go. Errors and
tracebacks are reported.</p>
<p>By default Evennia only tests itself. But you can also add your own tests to your game code and have
Evennia run those for you.</p>
<section id="running-the-evennia-test-suite">
<h2>Running the Evennia test suite<a class="headerlink" href="#running-the-evennia-test-suite" title="Permalink to this headline"></a></h2>
<p>To run the full Evennia test suite, go to your game folder and issue the command</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>evennia test evennia
</pre></div>
</div>
<p>This will run all the evennia tests using the default settings. You could also run only a subset of
all tests by specifying a subpackage of the library:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>evennia test evennia.commands.default
</pre></div>
</div>
<p>A temporary database will be instantiated to manage the tests. If everything works out you will see
how many tests were run and how long it took. If something went wrong you will get error messages.
If you contribute to Evennia, this is a useful sanity check to see you haven’t introduced an
unexpected bug.</p>
</section>
<section id="running-tests-with-custom-settings-file">
<h2>Running tests with custom settings file<a class="headerlink" href="#running-tests-with-custom-settings-file" title="Permalink to this headline"></a></h2>
<p>If you have implemented your own tests for your game (see below) you can run them from your game dir
with</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>evennia test .
</pre></div>
</div>
<p>The period (<code class="docutils literal notranslate"><span class="pre">.</span></code>) means to run all tests found in the current directory and all subdirectories. You
could also specify, say, <code class="docutils literal notranslate"><span class="pre">typeclasses</span></code> or <code class="docutils literal notranslate"><span class="pre">world</span></code> if you wanted to just run tests in those subdirs.</p>
<p>Those tests will all be run using the default settings. To run the tests with your own settings file
you must use the <code class="docutils literal notranslate"><span class="pre">--settings</span></code> option:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>evennia test --settings settings.py .
</pre></div>
</div>
<p>The <code class="docutils literal notranslate"><span class="pre">--settings</span></code> option of Evennia takes a file name in the <code class="docutils literal notranslate"><span class="pre">mygame/server/conf</span></code> folder. It is
normally used to swap settings files for testing and development. In combination with <code class="docutils literal notranslate"><span class="pre">test</span></code>, it
forces Evennia to use this settings file over the default one.</p>
</section>
<section id="writing-new-tests">
<h2>Writing new tests<a class="headerlink" href="#writing-new-tests" title="Permalink to this headline"></a></h2>
<p>Evennia’s test suite makes use of Django unit test system, which in turn relies on Python’s
<em>unittest</em> module.</p>
<blockquote>
<div><p>If you want to help out writing unittests for Evennia, take a look at Evennia’s <a class="reference external" href="https://coveralls.io/github/evennia/evennia">coveralls.io
page</a>. There you see which modules have any form of
test coverage and which does not.</p>
</div></blockquote>
<p>To make the test runner find the tests, they must be put in a module named <code class="docutils literal notranslate"><span class="pre">test*.py</span></code> (so <code class="docutils literal notranslate"><span class="pre">test.py</span></code>,
<code class="docutils literal notranslate"><span class="pre">tests.py</span></code> etc). Such a test module will be found wherever it is in the package. It can be a good
idea to look at some of Evennia’s <code class="docutils literal notranslate"><span class="pre">tests.py</span></code> modules to see how they look.</p>
<p>Inside a testing file, a <code class="docutils literal notranslate"><span class="pre">unittest.TestCase</span></code> class is used to test a single aspect or component in
various ways. Each test case contains one or more <em>test methods</em> - these define the actual tests to
run. You can name the test methods anything you want as long as the name starts with “<code class="docutils literal notranslate"><span class="pre">test_</span></code>”.
Your <code class="docutils literal notranslate"><span class="pre">TestCase</span></code> class can also have a method <code class="docutils literal notranslate"><span class="pre">setUp()</span></code>. This is run before each test, setting up and
storing whatever preparations the test methods need. Conversely, a <code class="docutils literal notranslate"><span class="pre">tearDown()</span></code> method can
optionally do cleanup after each test.</p>
<p>To test the results, you use special methods of the <code class="docutils literal notranslate"><span class="pre">TestCase</span></code> class. Many of those start with
“<code class="docutils literal notranslate"><span class="pre">assert</span></code>”, such as <code class="docutils literal notranslate"><span class="pre">assertEqual</span></code> or <code class="docutils literal notranslate"><span class="pre">assertTrue</span></code>.</p>
<p>Example of a <code class="docutils literal notranslate"><span class="pre">TestCase</span></code> class:</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span> <span class="kn">import</span> <span class="nn">unittest</span>
<span class="c1"># the function we want to test</span>
<span class="kn">from</span> <span class="nn">mypath</span> <span class="kn">import</span> <span class="n">myfunc</span>
<span class="k">class</span> <span class="nc">TestObj</span><span class="p">(</span><span class="n">unittest</span><span class="o">.</span><span class="n">TestCase</span><span class="p">):</span>
<span class="s2">&quot;This tests a function myfunc.&quot;</span>
<span class="k">def</span> <span class="nf">test_return_value</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="s2">&quot;test method. Makes sure return value is as expected.&quot;</span>
<span class="n">expected_return</span> <span class="o">=</span> <span class="s2">&quot;This is me being nice.&quot;</span>
<span class="n">actual_return</span> <span class="o">=</span> <span class="n">myfunc</span><span class="p">()</span>
<span class="c1"># test</span>
<span class="bp">self</span><span class="o">.</span><span class="n">assertEqual</span><span class="p">(</span><span class="n">expected_return</span><span class="p">,</span> <span class="n">actual_return</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">test_alternative_call</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="s2">&quot;test method. Calls with a keyword argument.&quot;</span>
<span class="n">expected_return</span> <span class="o">=</span> <span class="s2">&quot;This is me being baaaad.&quot;</span>
<span class="n">actual_return</span> <span class="o">=</span> <span class="n">myfunc</span><span class="p">(</span><span class="n">bad</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
<span class="c1"># test</span>
<span class="bp">self</span><span class="o">.</span><span class="n">assertEqual</span><span class="p">(</span><span class="n">expected_return</span><span class="p">,</span> <span class="n">actual_return</span><span class="p">)</span>
</pre></div>
</div>
<p>You might also want to read the <a class="reference external" href="https://docs.python.org/library/unittest.html">documentation for the unittest
module</a>.</p>
<section id="using-the-evenniatest-class">
<h3>Using the EvenniaTest class<a class="headerlink" href="#using-the-evenniatest-class" title="Permalink to this headline"></a></h3>
<p>Evennia offers a custom TestCase, the <code class="docutils literal notranslate"><span class="pre">evennia.utils.test_resources.EvenniaTest</span></code> class. This class
initiates a range of useful properties on themselves for testing Evennia systems. Examples are
<code class="docutils literal notranslate"><span class="pre">.account</span></code> and <code class="docutils literal notranslate"><span class="pre">.session</span></code> representing a mock connected Account and its Session and <code class="docutils literal notranslate"><span class="pre">.char1</span></code> and
<code class="docutils literal notranslate"><span class="pre">char2</span></code> representing Characters complete with a location in the test database. These are all useful
when testing Evennia system requiring any of the default Evennia typeclasses as inputs. See the full
definition of the <code class="docutils literal notranslate"><span class="pre">EvenniaTest</span></code> class in
<a class="reference external" href="https://github.com/evennia/evennia/blob/master/evennia/utils/test_resources.py">evennia/utils/test_resources.py</a>.</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="c1"># in a test module</span>
<span class="kn">from</span> <span class="nn">evennia.utils.test_resources</span> <span class="kn">import</span> <span class="n">EvenniaTest</span>
<span class="k">class</span> <span class="nc">TestObject</span><span class="p">(</span><span class="n">EvenniaTest</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">test_object_search</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="c1"># char1 and char2 are both created in room1</span>
<span class="bp">self</span><span class="o">.</span><span class="n">assertEqual</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">char1</span><span class="o">.</span><span class="n">search</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">char2</span><span class="o">.</span><span class="n">key</span><span class="p">),</span> <span class="bp">self</span><span class="o">.</span><span class="n">char2</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">assertEqual</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">char1</span><span class="o">.</span><span class="n">search</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">char1</span><span class="o">.</span><span class="n">location</span><span class="o">.</span><span class="n">key</span><span class="p">),</span> <span class="bp">self</span><span class="o">.</span><span class="n">char1</span><span class="o">.</span><span class="n">location</span><span class="p">)</span>
<span class="c1"># ...</span>
</pre></div>
</div>
</section>
<section id="testing-in-game-commands">
<h3>Testing in-game Commands<a class="headerlink" href="#testing-in-game-commands" title="Permalink to this headline"></a></h3>
<p>In-game Commands are a special case. Tests for the default commands are put in
<code class="docutils literal notranslate"><span class="pre">evennia/commands/default/tests.py</span></code>. This uses a custom <code class="docutils literal notranslate"><span class="pre">CommandTest</span></code> class that inherits from
<code class="docutils literal notranslate"><span class="pre">evennia.utils.test_resources.EvenniaTest</span></code> described above. <code class="docutils literal notranslate"><span class="pre">CommandTest</span></code> supplies extra convenience
functions for executing commands and check that their return values (calls of <code class="docutils literal notranslate"><span class="pre">msg()</span></code> returns
expected values. It uses Characters and Sessions generated on the <code class="docutils literal notranslate"><span class="pre">EvenniaTest</span></code> class to call each
class).</p>
<p>Each command tested should have its own <code class="docutils literal notranslate"><span class="pre">TestCase</span></code> class. Inherit this class from the <code class="docutils literal notranslate"><span class="pre">CommandTest</span></code>
class in the same module to get access to the command-specific utilities mentioned.</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span> <span class="kn">from</span> <span class="nn">evennia.commands.default.tests</span> <span class="kn">import</span> <span class="n">CommandTest</span>
<span class="kn">from</span> <span class="nn">evennia.commands.default</span> <span class="kn">import</span> <span class="n">general</span>
<span class="k">class</span> <span class="nc">TestSet</span><span class="p">(</span><span class="n">CommandTest</span><span class="p">):</span>
<span class="s2">&quot;tests the look command by simple call, using Char2 as a target&quot;</span>
<span class="k">def</span> <span class="nf">test_mycmd_char</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">call</span><span class="p">(</span><span class="n">general</span><span class="o">.</span><span class="n">CmdLook</span><span class="p">(),</span> <span class="s2">&quot;Char2&quot;</span><span class="p">,</span> <span class="s2">&quot;Char2(#7)&quot;</span><span class="p">)</span>
<span class="s2">&quot;tests the look command by simple call, with target as room&quot;</span>
<span class="k">def</span> <span class="nf">test_mycmd_room</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">call</span><span class="p">(</span><span class="n">general</span><span class="o">.</span><span class="n">CmdLook</span><span class="p">(),</span> <span class="s2">&quot;Room&quot;</span><span class="p">,</span>
<span class="s2">&quot;Room(#1)</span><span class="se">\n</span><span class="s2">room_desc</span><span class="se">\n</span><span class="s2">Exits: out(#3)</span><span class="se">\n</span><span class="s2">&quot;</span>
<span class="s2">&quot;You see: Obj(#4), Obj2(#5), Char2(#7)&quot;</span><span class="p">)</span>
</pre></div>
</div>
</section>
<section id="unit-testing-contribs-with-custom-models">
<h3>Unit testing contribs with custom models<a class="headerlink" href="#unit-testing-contribs-with-custom-models" title="Permalink to this headline"></a></h3>
<p>A special case is if you were to create a contribution to go to the <code class="docutils literal notranslate"><span class="pre">evennia/contrib</span></code> folder that
uses its <a class="reference internal" href="../Concepts/New-Models.html"><span class="doc std std-doc">own database models</span></a>. The problem with this is that Evennia (and Django) will
only recognize models in <code class="docutils literal notranslate"><span class="pre">settings.INSTALLED_APPS</span></code>. If a user wants to use your contrib, they will
be required to add your models to their settings file. But since contribs are optional you cannot
add the model to Evennia’s central <code class="docutils literal notranslate"><span class="pre">settings_default.py</span></code> file - this would always create your
optional models regardless of if the user wants them. But at the same time a contribution is a part
of the Evennia distribution and its unit tests should be run with all other Evennia tests using
<code class="docutils literal notranslate"><span class="pre">evennia</span> <span class="pre">test</span> <span class="pre">evennia</span></code>.</p>
<p>The way to do this is to only temporarily add your models to the <code class="docutils literal notranslate"><span class="pre">INSTALLED_APPS</span></code> directory when the
test runs. here is an example of how to do it.</p>
<blockquote>
<div><p>Note that this solution, derived from this [stackexchange
answer](<a class="reference external" href="http://stackoverflow.com/questions/502916/django-how-to-create-a-model-dynamically-just-for-">http://stackoverflow.com/questions/502916/django-how-to-create-a-model-dynamically-just-for-</a>
testing#503435) is currently untested! Please report your findings.</p>
</div></blockquote>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="c1"># a file contrib/mycontrib/tests.py</span>
<span class="kn">from</span> <span class="nn">django.conf</span> <span class="kn">import</span> <span class="n">settings</span>
<span class="kn">import</span> <span class="nn">django</span>
<span class="kn">from</span> <span class="nn">evennia.utils.test_resources</span> <span class="kn">import</span> <span class="n">EvenniaTest</span>
<span class="n">OLD_DEFAULT_SETTINGS</span> <span class="o">=</span> <span class="n">settings</span><span class="o">.</span><span class="n">INSTALLED_APPS</span>
<span class="n">DEFAULT_SETTINGS</span> <span class="o">=</span> <span class="nb">dict</span><span class="p">(</span>
<span class="n">INSTALLED_APPS</span><span class="o">=</span><span class="p">(</span>
<span class="s1">&#39;contrib.mycontrib.tests&#39;</span><span class="p">,</span>
<span class="p">),</span>
<span class="n">DATABASES</span><span class="o">=</span><span class="p">{</span>
<span class="s2">&quot;default&quot;</span><span class="p">:</span> <span class="p">{</span>
<span class="s2">&quot;ENGINE&quot;</span><span class="p">:</span> <span class="s2">&quot;django.db.backends.sqlite3&quot;</span>
<span class="p">}</span>
<span class="p">},</span>
<span class="n">SILENCED_SYSTEM_CHECKS</span><span class="o">=</span><span class="p">[</span><span class="s2">&quot;1_7.W001&quot;</span><span class="p">],</span>
<span class="p">)</span>
<span class="k">class</span> <span class="nc">TestMyModel</span><span class="p">(</span><span class="n">EvenniaTest</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">setUp</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">settings</span><span class="o">.</span><span class="n">configured</span><span class="p">:</span>
<span class="n">settings</span><span class="o">.</span><span class="n">configure</span><span class="p">(</span><span class="o">**</span><span class="n">DEFAULT_SETTINGS</span><span class="p">)</span>
<span class="n">django</span><span class="o">.</span><span class="n">setup</span><span class="p">()</span>
<span class="kn">from</span> <span class="nn">django.core.management</span> <span class="kn">import</span> <span class="n">call_command</span>
<span class="kn">from</span> <span class="nn">django.db.models</span> <span class="kn">import</span> <span class="n">loading</span>
<span class="n">loading</span><span class="o">.</span><span class="n">cache</span><span class="o">.</span><span class="n">loaded</span> <span class="o">=</span> <span class="kc">False</span>
<span class="n">call_command</span><span class="p">(</span><span class="s1">&#39;syncdb&#39;</span><span class="p">,</span> <span class="n">verbosity</span><span class="o">=</span><span class="mi">0</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">tearDown</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="n">settings</span><span class="o">.</span><span class="n">configure</span><span class="p">(</span><span class="o">**</span><span class="n">OLD_DEFAULT_SETTINGS</span><span class="p">)</span>
<span class="n">django</span><span class="o">.</span><span class="n">setup</span><span class="p">()</span>
<span class="kn">from</span> <span class="nn">django.core.management</span> <span class="kn">import</span> <span class="n">call_command</span>
<span class="kn">from</span> <span class="nn">django.db.models</span> <span class="kn">import</span> <span class="n">loading</span>
<span class="n">loading</span><span class="o">.</span><span class="n">cache</span><span class="o">.</span><span class="n">loaded</span> <span class="o">=</span> <span class="kc">False</span>
<span class="n">call_command</span><span class="p">(</span><span class="s1">&#39;syncdb&#39;</span><span class="p">,</span> <span class="n">verbosity</span><span class="o">=</span><span class="mi">0</span><span class="p">)</span>
<span class="c1"># test cases below ...</span>
<span class="k">def</span> <span class="nf">test_case</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="c1"># test case here</span>
</pre></div>
</div>
</section>
<section id="a-note-on-adding-new-tests">
<h3>A note on adding new tests<a class="headerlink" href="#a-note-on-adding-new-tests" title="Permalink to this headline"></a></h3>
<p>Having an extensive tests suite is very important for avoiding code degradation as Evennia is
developed. Only a small fraction of the Evennia codebase is covered by test suites at this point.
Writing new tests is not hard, it’s more a matter of finding the time to do so. So adding new tests
is really an area where everyone can contribute, also with only limited Python skills.</p>
</section>
<section id="a-note-on-making-the-test-runner-faster">
<h3>A note on making the test runner faster<a class="headerlink" href="#a-note-on-making-the-test-runner-faster" title="Permalink to this headline"></a></h3>
<p>If you have custom models with a large number of migrations, creating the test database can take a
very long time. If you don’t require migrations to run for your tests, you can disable them with the
django-test-without-migrations package. To install it, simply:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ pip install django-test-without-migrations
</pre></div>
</div>
<p>Then add it to your <code class="docutils literal notranslate"><span class="pre">INSTALLED_APPS</span></code> in your <code class="docutils literal notranslate"><span class="pre">server.conf.settings.py</span></code>:</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="n">INSTALLED_APPS</span> <span class="o">=</span> <span class="p">(</span>
<span class="c1"># ...</span>
<span class="s1">&#39;test_without_migrations&#39;</span><span class="p">,</span>
<span class="p">)</span>
</pre></div>
</div>
<p>After doing so, you can then run tests without migrations by adding the <code class="docutils literal notranslate"><span class="pre">--nomigrations</span></code> argument:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">evennia</span> <span class="n">test</span> <span class="o">--</span><span class="n">settings</span> <span class="n">settings</span><span class="o">.</span><span class="n">py</span> <span class="o">--</span><span class="n">nomigrations</span> <span class="o">.</span>
</pre></div>
</div>
</section>
</section>
<section id="testing-for-game-development-mini-tutorial">
<h2>Testing for Game development (mini-tutorial)<a class="headerlink" href="#testing-for-game-development-mini-tutorial" title="Permalink to this headline"></a></h2>
<p>Unit testing can be of paramount importance to game developers. When starting with a new game, it is
recommended to look into unit testing as soon as possible; an already huge game is much harder to
write tests for. The benefits of testing a game aren’t different from the ones regarding library
testing. For example it is easy to introduce bugs that affect previously working code. Testing is
there to ensure your project behaves the way it should and continue to do so.</p>
<p>If you have never used unit testing (with Python or another language), you might want to check the
<a class="reference external" href="https://docs.python.org/2/library/unittest.html">official Python documentation about unit testing</a>,
particularly the first section dedicated to a basic example.</p>
<section id="basic-testing-using-evennia">
<h3>Basic testing using Evennia<a class="headerlink" href="#basic-testing-using-evennia" title="Permalink to this headline"></a></h3>
<p>Evennia’s test runner can be used to launch tests in your game directory (let’s call it ‘mygame’).
Evennia’s test runner does a few useful things beyond the normal Python unittest module:</p>
<ul class="simple">
<li><p>It creates and sets up an empty database, with some useful objects (accounts, characters and
rooms, among others).</p></li>
<li><p>It provides simple ways to test commands, which can be somewhat tricky at times, if not tested
properly.</p></li>
</ul>
<p>Therefore, you should use the command-line to execute the test runner, while specifying your own
game directories (not the one containing evennia). Go to your game directory (referred as ‘mygame’
in this section) and execute the test runner:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>evennia --settings settings.py test commands
</pre></div>
</div>
<p>This command will execute Evennia’s test runner using your own settings file. It will set up a dummy
database of your choice and look into the ‘commands’ package defined in your game directory
(<code class="docutils literal notranslate"><span class="pre">mygame/commands</span></code> in this example) to find tests. The test module’s name should begin with ‘test’
and contain one or more <code class="docutils literal notranslate"><span class="pre">TestCase</span></code>. A full example can be found below.</p>
</section>
<section id="a-simple-example">
<h3>A simple example<a class="headerlink" href="#a-simple-example" title="Permalink to this headline"></a></h3>
<p>In your game directory, go to <code class="docutils literal notranslate"><span class="pre">commands</span></code> and create a new file <code class="docutils literal notranslate"><span class="pre">tests.py</span></code> inside (it could be named
anything starting with <code class="docutils literal notranslate"><span class="pre">test</span></code>). We will start by making a test that has nothing to do with Commands,
just to show how unit testing works:</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span> <span class="c1"># mygame/commands/tests.py</span>
<span class="kn">import</span> <span class="nn">unittest</span>
<span class="k">class</span> <span class="nc">TestString</span><span class="p">(</span><span class="n">unittest</span><span class="o">.</span><span class="n">TestCase</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;Unittest for strings (just a basic example).&quot;&quot;&quot;</span>
<span class="k">def</span> <span class="nf">test_upper</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;Test the upper() str method.&quot;&quot;&quot;</span>
<span class="bp">self</span><span class="o">.</span><span class="n">assertEqual</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="o">.</span><span class="n">upper</span><span class="p">(),</span> <span class="s1">&#39;FOO&#39;</span><span class="p">)</span>
</pre></div>
</div>
<p>This example, inspired from the Python documentation, is used to test the ‘upper()’ method of the
‘str’ class. Not very useful, but it should give you a basic idea of how tests are used.</p>
<p>Let’s execute that test to see if it works.</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>&gt; evennia --settings settings.py test commands
TESTING: Using specified settings file &#39;server.conf.settings&#39;.
(Obs: Evennia&#39;s full test suite may not pass if the settings are very
different from the default. Use &#39;test .&#39; as arguments to run only tests
on the game dir.)
Creating test database for alias &#39;default&#39;...
.
----------------------------------------------------------------------
Ran 1 test in 0.001s
OK
Destroying test database for alias &#39;default&#39;...
</pre></div>
</div>
<p>We specified the <code class="docutils literal notranslate"><span class="pre">commands</span></code> package to the evennia test command since that’s where we put our test
file. In this case we could just as well just said <code class="docutils literal notranslate"><span class="pre">.</span></code> to search all of <code class="docutils literal notranslate"><span class="pre">mygame</span></code> for testing files.
If we have a lot of tests it may be useful to test only a single set at a time though. We get an
information text telling us we are using our custom settings file (instead of Evennia’s default
file) and then the test runs. The test passes! Change the “FOO” string to something else in the test
to see how it looks when it fails.</p>
</section>
<section id="testing-commands">
<h3>Testing commands<a class="headerlink" href="#testing-commands" title="Permalink to this headline"></a></h3>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>This is not correct anymore.</p>
</div>
<p>This section will test the proper execution of the ‘abilities’ command, as described in the DELETED
tutorial to create the ‘abilities’ command, we will need it to test it.</p>
<p>Testing commands in Evennia is a bit more complex than the simple testing example we have seen.
Luckily, Evennia supplies a special test class to do just that … we just need to inherit from it
and use it properly. This class is called ‘CommandTest’ and is defined in the
‘evennia.commands.default.tests’ package. To create a test for our ‘abilities’ command, we just
need to create a class that inherits from ‘CommandTest’ and add methods.</p>
<p>We could create a new test file for this but for now we just append to the <code class="docutils literal notranslate"><span class="pre">tests.py</span></code> file we
already have in <code class="docutils literal notranslate"><span class="pre">commands</span></code> from before.</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span> <span class="c1"># bottom of mygame/commands/tests.py</span>
<span class="kn">from</span> <span class="nn">evennia.commands.default.tests</span> <span class="kn">import</span> <span class="n">CommandTest</span>
<span class="kn">from</span> <span class="nn">commands.command</span> <span class="kn">import</span> <span class="n">CmdAbilities</span>
<span class="kn">from</span> <span class="nn">typeclasses.characters</span> <span class="kn">import</span> <span class="n">Character</span>
<span class="k">class</span> <span class="nc">TestAbilities</span><span class="p">(</span><span class="n">CommandTest</span><span class="p">):</span>
<span class="n">character_typeclass</span> <span class="o">=</span> <span class="n">Character</span>
<span class="k">def</span> <span class="nf">test_simple</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">call</span><span class="p">(</span><span class="n">CmdAbilities</span><span class="p">(),</span> <span class="s2">&quot;&quot;</span><span class="p">,</span> <span class="s2">&quot;STR: 5, AGI: 4, MAG: 2&quot;</span><span class="p">)</span>
</pre></div>
</div>
<ul class="simple">
<li><p>Line 1-4: we do some importing. ‘CommandTest’ is going to be our base class for our test, so we
need it. We also import our command (‘CmdAbilities’ in this case). Finally we import the
‘Character’ typeclass. We need it, since ‘CommandTest’ doesn’t use ‘Character’, but
‘DefaultCharacter’, which means the character calling the command won’t have the abilities we have
written in the ‘Character’ typeclass.</p></li>
<li><p>Line 6-8: that’s the body of our test. Here, a single command is tested in an entire class.
Default commands are usually grouped by category in a single class. There is no rule, as long as
you know where you put your tests. Note that we set the ‘character_typeclass’ class attribute to
Character. As explained above, if you didn’t do that, the system would create a ‘DefaultCharacter’
object, not a ‘Character’. You can try to remove line 4 and 8 to see what happens when running the
test.</p></li>
<li><p>Line 10-11: our unique testing method. Note its name: it should begin by ‘test_’. Apart from
that, the method is quite simple: it’s an instance method (so it takes the ‘self’ argument) but no
other arguments are needed. Line 11 uses the ‘call’ method, which is defined in ‘CommandTest’.
It’s a useful method that compares a command against an expected result. It would be like comparing
two strings with ‘assertEqual’, but the ‘call’ method does more things, including testing the
command in a realistic way (calling its hooks in the right order, so you don’t have to worry about
that).</p></li>
</ul>
<p>Line 11 can be understood as: test the ‘abilities’ command (first parameter), with no argument
(second parameter), and check that the character using it receives his/her abilities (third
parameter).</p>
<p>Let’s run our new test:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>&gt; evennia --settings settings.py test commands
[...]
Creating test database for alias &#39;default&#39;...
..
----------------------------------------------------------------------
Ran 2 tests in 0.156s
OK
Destroying test database for alias &#39;default&#39;...
</pre></div>
</div>
<p>Two tests were executed, since we have kept ‘TestString’ from last time. In case of failure, you
will get much more information to help you fix the bug.</p>
</section>
</section>
</section>
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<p><h3><a href="../index.html">Table of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#">Unit Testing</a><ul>
<li><a class="reference internal" href="#running-the-evennia-test-suite">Running the Evennia test suite</a></li>
<li><a class="reference internal" href="#running-tests-with-custom-settings-file">Running tests with custom settings file</a></li>
<li><a class="reference internal" href="#writing-new-tests">Writing new tests</a><ul>
<li><a class="reference internal" href="#using-the-evenniatest-class">Using the EvenniaTest class</a></li>
<li><a class="reference internal" href="#testing-in-game-commands">Testing in-game Commands</a></li>
<li><a class="reference internal" href="#unit-testing-contribs-with-custom-models">Unit testing contribs with custom models</a></li>
<li><a class="reference internal" href="#a-note-on-adding-new-tests">A note on adding new tests</a></li>
<li><a class="reference internal" href="#a-note-on-making-the-test-runner-faster">A note on making the test runner faster</a></li>
</ul>
</li>
<li><a class="reference internal" href="#testing-for-game-development-mini-tutorial">Testing for Game development (mini-tutorial)</a><ul>
<li><a class="reference internal" href="#basic-testing-using-evennia">Basic testing using Evennia</a></li>
<li><a class="reference internal" href="#a-simple-example">A simple example</a></li>
<li><a class="reference internal" href="#testing-commands">Testing commands</a></li>
</ul>
</li>
</ul>
</li>
</ul>
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