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-
- <h1>
- <span><a id="jumper" href="#jumpto" title="Un peu perdu ?">?</a></span>
- Your tests as your specs (archive)
- <time>Pour la pérennité des contenus liés. Non-indexé, retrait sur simple email.</time>
- </h1>
- <section>
- <article>
- <h3><a href="http://blog.mathieu-leplatre.info/your-tests-as-your-specs.html">Source originale du contenu</a></h3>
- <p>At last, with all this surrounding pressure, you finally decided to write tests.
- Now, you always setup TravisCI to run when code change is submitted. You now feel
- confident when pull-requests come in, and soon your test suite code coverage will
- reach 100%.</p>
-
- <p>Let me be difficult to please here...</p>
-
- <p><img alt="" class="align-center" src="/images/tests-specs-nitpick.jpg"/>
- <p>You can reach clean code heaven with one final little step: <strong>transform the tests
- suites into specifications</strong>!</p>
- <div class="section" id="bad-pattern">
- <h2>Bad pattern</h2>
- <p>In many Open Source projects, a great attention is paid to the quality of the
- code itself. It is quite often that some code is merged without the tests being
- exhaustively reviewed.</p>
- <p>In other words, it is not rare that the quality of the tests is not reflecting
- the quality of the application code.</p>
- <p>The most frequent pattern is that all tests are implemented in the same test case :</p>
- <div class="highlight"><pre><span class="k">class</span> <span class="nc">GameTest</span><span class="p">(</span><span class="n">unittest</span><span class="o">.</span><span class="n">TestCase</span><span class="p">):</span></p>
- <pre><code><span class="k">def</span> <span class="nf">test_update</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
- <span class="n">game</span> <span class="o">=</span> <span class="n">Game</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="n">game</span><span class="o">.</span><span class="n">played</span><span class="p">,</span> <span class="bp">False</span><span class="p">)</span>
-
- <span class="n">game</span><span class="o">.</span><span class="n">score</span> <span class="o">=</span> <span class="mi">4</span>
- <span class="bp">self</span><span class="o">.</span><span class="n">assertEqual</span><span class="p">(</span><span class="n">game</span><span class="o">.</span><span class="n">played</span><span class="p">,</span> <span class="bp">True</span><span class="p">)</span>
-
- <span class="n">game</span><span class="o">.</span><span class="n">player</span> <span class="o">=</span> <span class="s">'Jean-Louis'</span>
- <span class="bp">self</span><span class="o">.</span><span class="n">assertEqual</span><span class="p">(</span><span class="nb">unicode</span><span class="p">(</span><span class="n">game</span><span class="p">),</span> <span class="s">'Jean-Louis (score: 4)'</span><span class="p">)</span>
-
- <span class="c"># See bug #2780</span>
- <span class="n">game</span><span class="o">.</span><span class="n">score</span> <span class="o">=</span> <span class="bp">None</span>
- <span class="bp">self</span><span class="o">.</span><span class="n">assertEqual</span><span class="p">(</span><span class="nb">unicode</span><span class="p">(</span><span class="n">game</span><span class="p">),</span> <span class="s">'Jean-Louis'</span><span class="p">)</span>
- </code></pre>
- <p></pre></div>
- <p>Writing tests like this has many drawbacks:</p>
- <ul class="simple">
- <li>One has to read the entire test to understand the expected behaviour of the code;</li>
- <li>If the test fails, it will be hard to find out what part of the code has failed precisely;</li>
- <li>Refactoring the code will probably mean to rewrite the entire test since instructions are
- inter-dependant;</li>
- <li>The <tt class="docutils literal">TestCase</tt> and <tt class="docutils literal">setUp()</tt> notions are underused.</li>
- </ul>
- </div>
- <div class="section" id="better-pattern">
- <h2>Better pattern</h2>
- <p>A simple way to improve the quality of the tests is to see them as specifications.
- After all, it makes sense, you add some code for a reason! The tests are not only
- here to prevent regressions, but also to explicit the expected behaviour of the application!</p>
- <p>I believe that many projects would take great benefits if following this approach .</p>
- <div class="highlight"><pre><span class="c"># test_game.py</span></p>
- <p><span class="k">class</span> <span class="nc">InitializationTest</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="k">def</span> <span class="nf">setUp</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">game</span> <span class="o">=</span> <span class="n">Game</span><span class="p">()</span></p>
- <pre><code><span class="k">def</span> <span class="nf">test_default_played_status_is_false</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">assertEqual</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">game</span><span class="o">.</span><span class="n">played</span><span class="p">,</span> <span class="bp">False</span><span class="p">)</span>
- </code></pre>
- <p><span class="k">class</span> <span class="nc">UpdateTest</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="k">def</span> <span class="nf">setUp</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">game</span> <span class="o">=</span> <span class="n">Game</span><span class="p">()</span>
- <span class="bp">self</span><span class="o">.</span><span class="n">game</span><span class="o">.</span><span class="n">player</span> <span class="o">=</span> <span class="s">'Jean-Louis'</span>
- <span class="bp">self</span><span class="o">.</span><span class="n">game</span><span class="o">.</span><span class="n">score</span> <span class="o">=</span> <span class="mi">4</span></p>
- <pre><code><span class="k">def</span> <span class="nf">test_played_status_is_true_if_score_is_set</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">assertEqual</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">game</span><span class="o">.</span><span class="n">played</span><span class="p">,</span> <span class="bp">True</span><span class="p">)</span>
-
- <span class="k">def</span> <span class="nf">test_string_representation_is_player_with_score_if_played</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">assertEqual</span><span class="p">(</span><span class="nb">unicode</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">game</span><span class="p">),</span> <span class="s">'Jean-Louis (score: 4)'</span><span class="p">)</span>
-
- <span class="k">def</span> <span class="nf">test_string_representation_is_only_player_if_not_played</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
- <span class="c"># See bug #2780</span>
- <span class="bp">self</span><span class="o">.</span><span class="n">game</span><span class="o">.</span><span class="n">score</span> <span class="o">=</span> <span class="bp">None</span>
- <span class="bp">self</span><span class="o">.</span><span class="n">assertEqual</span><span class="p">(</span><span class="nb">unicode</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">game</span><span class="p">),</span> <span class="s">'Jean-Louis'</span><span class="p">)</span>
- </code></pre>
- <p></pre></div>
- <p>Writing tests like this has many advantages:</p>
- <ul class="simple">
- <li>Each case isolates a situation;</li>
- <li>Each test is an aspect of the specification;</li>
- <li>Each test is independant;</li>
- <li>The testing vocabulary is honored: we <em>setup</em> a <em>test case</em>;</li>
- <li>If a test fails, it is straightforward to understand what part of the spec
- was violated;</li>
- <li>Tests that were written when fixing bugs will explicit the expected behaviour
- for edge cases.</li>
- </ul>
- </div>
- <div class="section" id="reporting">
- <h2>Reporting</h2>
- <p>Now that we have explicited the specs, we will want to read them properly.</p>
- <p>One of things I like in JavaScript is <a class="reference external" href="http://mochajs.org">Mocha</a>. Appart
- from the nice API and the very rich feature set, its default test reporter is
- great, tt is colourful and structurally invites you to write tests as specs.</p>
- <img alt="" class="align-center" src="/images/tests-specs-mocha.png"/>
- <p>In our project, we were using <a class="reference external" href="http://nose.readthedocs.org">nose</a>, so I
- decided to write a reporter that would produce the same output as Mocha.</p>
- <p>You can install and use it this way:</p>
- <pre class="literal-block">
- $ pip install nose-mocha-reporter</p>
- <p>$ nosetests --with-mocha-reporter yourpackage/
- </pre>
- <p>It will produce the following output:</p>
- <img alt="" class="align-center" src="/images/tests-specs-nose-reporter.png"/>
- <p>It takes the tests suites and extract the names as readable strings:</p>
- <ul class="simple">
- <li><tt class="docutils literal">tests/core/test_game.py</tt> → <tt class="docutils literal">CORE GAME</tt></li>
- <li><tt class="docutils literal">class InitializationTest(TestCase)</tt> → <tt class="docutils literal">Initialization</tt></li>
- <li><tt class="docutils literal">def test_played_status_is_true_if_score_is_set</tt> → <tt class="docutils literal">Played status is true if score is set</tt></li>
- </ul>
- <p>It also mesures the execution time of each test in order highlight the slow ones.</p>
- <p>To conclude, this reporter has a pretty modest objective: remind you that <strong>the tests
- you write should be read as specifications</strong> !</p>
- </div>
- <div class="section" id="special-thanks">
- <h2>Special thanks!</h2>
- <p>I'm very grateful to <a class="reference external" href="http://antoine.cezar.fr/">Antoine</a> and
- <a class="reference external" href="http://alexmarandon.com/">Alex</a> that showed me the light on
- this. Since they might not be conscious of the influence they had on me,
- I jump on the occasion to thank them loudly :)</p></p>
- </article>
- </section>
-
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- <a href="/david/blog/2018/commodite-effondrement/" title="Accéder à l’article complet">Commodité et effondrement</a>,
- <a href="/david/blog/2017/donnees-communs/" title="Accéder à l’article complet">Des données aux communs</a>,
- <a href="/david/blog/2016/accompagner-enfant/" title="Accéder à l’article complet">Accompagner un enfant</a>,
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- <a href="/david/blog/2016/instantane-scopyleft/" title="Accéder à l’article complet">Instantané Scopyleft</a>,
- <a href="/david/blog/2016/enseigner-web/" title="Accéder à l’article complet">Enseigner le Web</a>,
- <a href="/david/blog/2016/simplicite-defaut/" title="Accéder à l’article complet">Simplicité par défaut</a>,
- <a href="/david/blog/2016/minimalisme-esthetique/" title="Accéder à l’article complet">Minimalisme et esthétique</a>,
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- <a href="/david/blog/2013/confort-convivialite/" title="Accéder à l’article complet">Confort et convivialité</a>,
- <a href="/david/blog/2013/testament-numerique/" title="Accéder à l’article complet">Testament numérique</a>,
- et <a href="/david/blog/" title="Accéder aux archives">bien d’autres…</a>
- </p>
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