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                                <h1 id="tests">Tests</h1>
<p>Les parties principales que l&apos;on veut couvrir par des tests unitaires avec Vuex sont les mutations et les actions.</p>
<h3 id="tester-les-mutations">Tester les mutations</h3>
<p>Les mutations sont tr&#xE8;s simples &#xE0; tester, puisque ce sont de simples fonctions qui se basent uniquement sur leurs arguments. Une astuce est que si vous utilisez les modules ES2015 et mettez vos mutations dans votre fichier <code>store.js</code>, en plus de l&apos;export par d&#xE9;faut, vous pouvez &#xE9;galement exporter vos mutations avec un export nomm&#xE9; :</p>
<pre class="language-"><code class="lang-js"><span class="token keyword">const</span> state <span class="token operator">=</span> <span class="token punctuation">{</span> <span class="token operator">...</span> <span class="token punctuation">}</span>

<span class="token comment" spellcheck="true">// exporter `mutations` en tant qu&apos;export nomm&#xE9;</span>
<span class="token keyword">export</span> <span class="token keyword">const</span> mutations <span class="token operator">=</span> <span class="token punctuation">{</span> <span class="token operator">...</span> <span class="token punctuation">}</span>

<span class="token keyword">export</span> <span class="token keyword">default</span> <span class="token keyword">new</span> <span class="token class-name">Vuex<span class="token punctuation">.</span>Store</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
  state<span class="token punctuation">,</span>
  mutations
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre>
<p>Exemple de test de mutation utilisant Mocha + Chai (vous pouvez utiliser n&apos;importe quel framework/biblioth&#xE8;que d&apos;assertion selon vos pr&#xE9;f&#xE9;rences) :</p>
<pre class="language-"><code class="lang-js"><span class="token comment" spellcheck="true">// mutations.js</span>
<span class="token keyword">export</span> <span class="token keyword">const</span> mutations <span class="token operator">=</span> <span class="token punctuation">{</span>
  increment<span class="token punctuation">:</span> state <span class="token operator">=</span><span class="token operator">&gt;</span> state<span class="token punctuation">.</span>count<span class="token operator">++</span>
<span class="token punctuation">}</span>
</code></pre>
<pre class="language-"><code class="lang-js"><span class="token comment" spellcheck="true">// mutations.spec.js</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> expect <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">&apos;chai&apos;</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> mutations <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">&apos;./store&apos;</span>

<span class="token comment" spellcheck="true">// assignement de `mutations` par d&#xE9;structuration</span>
<span class="token keyword">const</span> <span class="token punctuation">{</span> increment <span class="token punctuation">}</span> <span class="token operator">=</span> mutations

<span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">&apos;mutations&apos;</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
  <span class="token function">it</span><span class="token punctuation">(</span><span class="token string">&apos;INCREMENT&apos;</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
    <span class="token comment" spellcheck="true">// &#xE9;tat simul&#xE9;</span>
    <span class="token keyword">const</span> state <span class="token operator">=</span> <span class="token punctuation">{</span> count<span class="token punctuation">:</span> <span class="token number">0</span> <span class="token punctuation">}</span>
    <span class="token comment" spellcheck="true">// appliquer la mutation</span>
    <span class="token function">increment</span><span class="token punctuation">(</span>state<span class="token punctuation">)</span>
    <span class="token comment" spellcheck="true">// tester le r&#xE9;sultat</span>
    <span class="token function">expect</span><span class="token punctuation">(</span>state<span class="token punctuation">.</span>count<span class="token punctuation">)</span><span class="token punctuation">.</span>to<span class="token punctuation">.</span><span class="token function">equal</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre>
<h3 id="tester-les-actions">Tester les actions</h3>
<p>Les actions sont un peu plus compliqu&#xE9;es car elles peuvent faire appel &#xE0; des APIs externes. Lorsque l&apos;on teste des actions, on a souvent besoin de faire plusieurs niveaux de simulation. Par exemple, on peut abstraire l&apos;appel API dans un service et simuler ce service dans nos tests. Afin de simuler facilement les d&#xE9;pendances, on peut utiliser webpack et <a href="https://github.com/plasticine/inject-loader" target="_blank">inject-loader</a> pour regrouper nos fichiers de test.</p>
<p>Exemple de test d&apos;une action asynchrone :</p>
<pre class="language-"><code class="lang-js"><span class="token comment" spellcheck="true">// actions.js</span>
<span class="token keyword">import</span> shop <span class="token keyword">from</span> <span class="token string">&apos;../api/shop&apos;</span>

<span class="token keyword">export</span> <span class="token keyword">const</span> getAllProducts <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">{</span> commit <span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
  <span class="token function">commit</span><span class="token punctuation">(</span><span class="token string">&apos;REQUEST_PRODUCTS&apos;</span><span class="token punctuation">)</span>
  shop<span class="token punctuation">.</span><span class="token function">getProducts</span><span class="token punctuation">(</span>products <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
    <span class="token function">commit</span><span class="token punctuation">(</span><span class="token string">&apos;RECEIVE_PRODUCTS&apos;</span><span class="token punctuation">,</span> products<span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span>
</code></pre>
<pre class="language-"><code class="lang-js"><span class="token comment" spellcheck="true">// actions.spec.js</span>

<span class="token comment" spellcheck="true">// utilisation de la syntaxe `require` pour les loaders.</span>
<span class="token comment" spellcheck="true">// avec inject-loader, cela retourne un module de fabrique</span>
<span class="token comment" spellcheck="true">// cela nous permet d&apos;injecter les d&#xE9;pendances simul&#xE9;es.</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> expect <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">&apos;chai&apos;</span>
<span class="token keyword">const</span> actionsInjector <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">&apos;inject-loader!./actions&apos;</span><span class="token punctuation">)</span>

<span class="token comment" spellcheck="true">// cr&#xE9;er un module avec nos simulations</span>
<span class="token keyword">const</span> actions <span class="token operator">=</span> <span class="token function">actionsInjector</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
  <span class="token string">&apos;../api/shop&apos;</span><span class="token punctuation">:</span> <span class="token punctuation">{</span>
    getProducts <span class="token punctuation">(</span>cb<span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token function">setTimeout</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
        <span class="token function">cb</span><span class="token punctuation">(</span><span class="token punctuation">[</span> <span class="token comment" spellcheck="true">/* r&#xE9;ponse simul&#xE9;e */</span> <span class="token punctuation">]</span><span class="token punctuation">)</span>
      <span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token number">100</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>

<span class="token comment" spellcheck="true">// fonction utilitaire pour tester des actions avec les mutations attendues</span>
<span class="token keyword">const</span> testAction <span class="token operator">=</span> <span class="token punctuation">(</span>action<span class="token punctuation">,</span> args<span class="token punctuation">,</span> state<span class="token punctuation">,</span> expectedMutations<span class="token punctuation">,</span> done<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
  <span class="token keyword">let</span> count <span class="token operator">=</span> <span class="token number">0</span>

  <span class="token comment" spellcheck="true">// acter une simulation</span>
  <span class="token keyword">const</span> commit <span class="token operator">=</span> <span class="token punctuation">(</span>type<span class="token punctuation">,</span> payload<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
    <span class="token keyword">const</span> mutation <span class="token operator">=</span> expectedMutations<span class="token punctuation">[</span>count<span class="token punctuation">]</span>

    <span class="token keyword">try</span> <span class="token punctuation">{</span>
      <span class="token function">expect</span><span class="token punctuation">(</span>type<span class="token punctuation">)</span><span class="token punctuation">.</span>to<span class="token punctuation">.</span><span class="token function">equal</span><span class="token punctuation">(</span>mutation<span class="token punctuation">.</span>type<span class="token punctuation">)</span>
      <span class="token keyword">if</span> <span class="token punctuation">(</span>payload<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token function">expect</span><span class="token punctuation">(</span>payload<span class="token punctuation">)</span><span class="token punctuation">.</span>to<span class="token punctuation">.</span>deep<span class="token punctuation">.</span><span class="token function">equal</span><span class="token punctuation">(</span>mutation<span class="token punctuation">.</span>payload<span class="token punctuation">)</span>
      <span class="token punctuation">}</span>
    <span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">error</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token function">done</span><span class="token punctuation">(</span>error<span class="token punctuation">)</span>
    <span class="token punctuation">}</span>

    count<span class="token operator">++</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span>count <span class="token operator">&gt;=</span> expectedMutations<span class="token punctuation">.</span>length<span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token function">done</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span>

  <span class="token comment" spellcheck="true">// appeler l&apos;action avec le store simul&#xE9; et les arguments</span>
  <span class="token function">action</span><span class="token punctuation">(</span><span class="token punctuation">{</span> commit<span class="token punctuation">,</span> state <span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token operator">...</span>args<span class="token punctuation">)</span>

  <span class="token comment" spellcheck="true">// v&#xE9;rifier qu&apos;aucune mutation n&apos;ait &#xE9;t&#xE9; propag&#xE9;e</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span>expectedMutations<span class="token punctuation">.</span>length <span class="token operator">===</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token function">expect</span><span class="token punctuation">(</span>count<span class="token punctuation">)</span><span class="token punctuation">.</span>to<span class="token punctuation">.</span><span class="token function">equal</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span>
    <span class="token function">done</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

<span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">&apos;actions&apos;</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
  <span class="token function">it</span><span class="token punctuation">(</span><span class="token string">&apos;getAllProducts&apos;</span><span class="token punctuation">,</span> done <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
    <span class="token function">testAction</span><span class="token punctuation">(</span>actions<span class="token punctuation">.</span>getAllProducts<span class="token punctuation">,</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token punctuation">[</span>
      <span class="token punctuation">{</span> type<span class="token punctuation">:</span> <span class="token string">&apos;REQUEST_PRODUCTS&apos;</span> <span class="token punctuation">}</span><span class="token punctuation">,</span>
      <span class="token punctuation">{</span> type<span class="token punctuation">:</span> <span class="token string">&apos;RECEIVE_PRODUCTS&apos;</span><span class="token punctuation">,</span> payload<span class="token punctuation">:</span> <span class="token punctuation">{</span> <span class="token comment" spellcheck="true">/* mocked response */</span> <span class="token punctuation">}</span> <span class="token punctuation">}</span>
    <span class="token punctuation">]</span><span class="token punctuation">,</span> done<span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre>
<h3 id="tester-les-accesseurs">Tester les accesseurs</h3>
<p>Si vos accesseurs font des calculs compliqu&#xE9;s, il peut &#xEA;tre judicieux de les tester. Les accesseurs sont &#xE9;galement tr&#xE8;s simples &#xE0; tester, pour les m&#xEA;mes raisons que les mutations.</p>
<p>Exemple de test d&apos;un accesseur :</p>
<pre class="language-"><code class="lang-js"><span class="token comment" spellcheck="true">// getters.js</span>
<span class="token keyword">export</span> <span class="token keyword">const</span> getters <span class="token operator">=</span> <span class="token punctuation">{</span>
  filteredProducts <span class="token punctuation">(</span>state<span class="token punctuation">,</span> <span class="token punctuation">{</span> filterCategory <span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> state<span class="token punctuation">.</span>products<span class="token punctuation">.</span><span class="token function">filter</span><span class="token punctuation">(</span>product <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
      <span class="token keyword">return</span> product<span class="token punctuation">.</span>category <span class="token operator">===</span> filterCategory
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<pre class="language-"><code class="lang-js"><span class="token comment" spellcheck="true">// getters.spec.js</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> expect <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">&apos;chai&apos;</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> getters <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">&apos;./getters&apos;</span>

<span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">&apos;getters&apos;</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
  <span class="token function">it</span><span class="token punctuation">(</span><span class="token string">&apos;filteredProducts&apos;</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
    <span class="token comment" spellcheck="true">// &#xE9;tat simul&#xE9;</span>
    <span class="token keyword">const</span> state <span class="token operator">=</span> <span class="token punctuation">{</span>
      products<span class="token punctuation">:</span> <span class="token punctuation">[</span>
        <span class="token punctuation">{</span> id<span class="token punctuation">:</span> <span class="token number">1</span><span class="token punctuation">,</span> title<span class="token punctuation">:</span> <span class="token string">&apos;Apple&apos;</span><span class="token punctuation">,</span> category<span class="token punctuation">:</span> <span class="token string">&apos;fruit&apos;</span> <span class="token punctuation">}</span><span class="token punctuation">,</span>
        <span class="token punctuation">{</span> id<span class="token punctuation">:</span> <span class="token number">2</span><span class="token punctuation">,</span> title<span class="token punctuation">:</span> <span class="token string">&apos;Orange&apos;</span><span class="token punctuation">,</span> category<span class="token punctuation">:</span> <span class="token string">&apos;fruit&apos;</span> <span class="token punctuation">}</span><span class="token punctuation">,</span>
        <span class="token punctuation">{</span> id<span class="token punctuation">:</span> <span class="token number">3</span><span class="token punctuation">,</span> title<span class="token punctuation">:</span> <span class="token string">&apos;Carrot&apos;</span><span class="token punctuation">,</span> category<span class="token punctuation">:</span> <span class="token string">&apos;vegetable&apos;</span> <span class="token punctuation">}</span>
      <span class="token punctuation">]</span>
    <span class="token punctuation">}</span>
    <span class="token comment" spellcheck="true">// accesseur simul&#xE9;</span>
    <span class="token keyword">const</span> filterCategory <span class="token operator">=</span> <span class="token string">&apos;fruit&apos;</span>

    <span class="token comment" spellcheck="true">// obtenir le r&#xE9;sultat depuis l&apos;accesseur</span>
    <span class="token keyword">const</span> result <span class="token operator">=</span> getters<span class="token punctuation">.</span><span class="token function">filteredProducts</span><span class="token punctuation">(</span>state<span class="token punctuation">,</span> <span class="token punctuation">{</span> filterCategory <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token comment" spellcheck="true">// tester le r&#xE9;sultat</span>
    <span class="token function">expect</span><span class="token punctuation">(</span>result<span class="token punctuation">)</span><span class="token punctuation">.</span>to<span class="token punctuation">.</span>deep<span class="token punctuation">.</span><span class="token function">equal</span><span class="token punctuation">(</span><span class="token punctuation">[</span>
      <span class="token punctuation">{</span> id<span class="token punctuation">:</span> <span class="token number">1</span><span class="token punctuation">,</span> title<span class="token punctuation">:</span> <span class="token string">&apos;Apple&apos;</span><span class="token punctuation">,</span> category<span class="token punctuation">:</span> <span class="token string">&apos;fruit&apos;</span> <span class="token punctuation">}</span><span class="token punctuation">,</span>
      <span class="token punctuation">{</span> id<span class="token punctuation">:</span> <span class="token number">2</span><span class="token punctuation">,</span> title<span class="token punctuation">:</span> <span class="token string">&apos;Orange&apos;</span><span class="token punctuation">,</span> category<span class="token punctuation">:</span> <span class="token string">&apos;fruit&apos;</span> <span class="token punctuation">}</span>
    <span class="token punctuation">]</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre>
<h3 id="lancer-les-tests">Lancer les tests</h3>
<p>Si vos mutations et actions sont &#xE9;crites comme il se doit, les tests ne devraient pas avoir de d&#xE9;pendance directe sur les APIs navigateur apr&#xE8;s une simulation pr&#xE9;alable. Cela signifie que vous pouvez simplement regrouper les tests avec webpack et les lancer directement dans Node.js. De fa&#xE7;on alternative, vous pouvez utiliser <code>mocha-loader</code> ou Karma + <code>karma-webpack</code> afin d&apos;effectuer les tests dans des vrais navigateurs.</p>
<h4 id="lancer-dans-nodejs">Lancer dans Node.js</h4>
<p>Cr&#xE9;ez la configuration webpack suivante (ainsi que le fichier <a href="https://babeljs.io/docs/usage/babelrc/" target="_blank"><code>.babelrc</code></a> qui correspond) :</p>
<pre class="language-"><code class="lang-js"><span class="token comment" spellcheck="true">// webpack.config.js</span>
module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
  entry<span class="token punctuation">:</span> <span class="token string">&apos;./test.js&apos;</span><span class="token punctuation">,</span>
  output<span class="token punctuation">:</span> <span class="token punctuation">{</span>
    path<span class="token punctuation">:</span> __dirname<span class="token punctuation">,</span>
    filename<span class="token punctuation">:</span> <span class="token string">&apos;test-bundle.js&apos;</span>
  <span class="token punctuation">}</span><span class="token punctuation">,</span>
  module<span class="token punctuation">:</span> <span class="token punctuation">{</span>
    loaders<span class="token punctuation">:</span> <span class="token punctuation">[</span>
      <span class="token punctuation">{</span>
        test<span class="token punctuation">:</span> <span class="token regex">/\.js$/</span><span class="token punctuation">,</span>
        loader<span class="token punctuation">:</span> <span class="token string">&apos;babel-loader&apos;</span><span class="token punctuation">,</span>
        exclude<span class="token punctuation">:</span> <span class="token regex">/node_modules/</span>
      <span class="token punctuation">}</span>
    <span class="token punctuation">]</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<p>Puis :</p>
<pre class="language-"><code class="lang-bash">webpack
mocha test-bundle.js
</code></pre>
<h4 id="lancer-dans-un-navigateur">Lancer dans un navigateur</h4>
<ol>
<li>Installez <code>mocha-loader</code>.</li>
<li>Changez l&apos;option <code>entry</code> de la configuration webpack ci-dessus pour <code>&apos;mocha-loader!babel-loader!./test.js&apos;</code>.</li>
<li>D&#xE9;marrez <code>webpack-dev-server</code> en utilisant la configuration.</li>
<li>Rendez-vous avec votre navigateur sur <code>localhost:8080/webpack-dev-server/test-bundle</code>.</li>
</ol>
<h4 id="lancer-dans-un-navigateur-avec-karma--karma-webpack">Lancer dans un navigateur avec Karma + karma-webpack</h4>
<p>Consultez la proc&#xE9;dure sur la <a href="https://vue-loader.vuejs.org/en/workflow/testing.html" target="_blank">documentation vue-loader</a>.</p>

                                
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