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                                <h1 id="testando">Testando</h1>
<p>As partes principais que queremos testar em Vuex s&#xE3;o muta&#xE7;&#xF5;es e a&#xE7;&#xF5;es.</p>
<h3 id="testando-muta&#xE7;&#xF5;es">Testando Muta&#xE7;&#xF5;es</h3>
<p>As muta&#xE7;&#xF5;es s&#xE3;o muito simples de testar, porque s&#xE3;o apenas fun&#xE7;&#xF5;es que dependem completamente de seus argumentos. Um truque &#xE9; que se voc&#xEA; estiver usando m&#xF3;dulos ES2015 e colocar suas muta&#xE7;&#xF5;es dentro do arquivo <code>store.js</code>, al&#xE9;m da exporta&#xE7;&#xE3;o padr&#xE3;o, voc&#xEA; tamb&#xE9;m deve exportar as muta&#xE7;&#xF5;es como uma exporta&#xE7;&#xE3;o nomeada:</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">// exportar `muta&#xE7;&#xF5;es` como uma exporta&#xE7;&#xE3;o nomeada</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>Exemplo de teste de uma muta&#xE7;&#xE3;o usando Mocha + Chai (voc&#xEA; pode usar qualquer biblioteca de estrutura / asser&#xE7;&#xE3;o que voc&#xEA; gosta):</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">// destructure assign `mutations`</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">// mock state</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">// apply 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">// assert result</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="testando-a&#xE7;&#xF5;es">Testando a&#xE7;&#xF5;es</h3>
<p>As a&#xE7;&#xF5;es podem ser um pouco mais complicadas porque podem chamar as APIs externas. Ao testar a&#xE7;&#xF5;es, geralmente precisamos fazer algum n&#xED;vel de <em>mocking</em>  - por exemplo, podemos resumir as chamadas da API em um servi&#xE7;o e simular esse servi&#xE7;o dentro de nossos testes. A fim de simular facilmente as depend&#xEA;ncias, podemos usar o webpack e <a href="https://github.com/plasticine/inject-loader" target="_blank">injetor-carregador</a> para agrupar nossos arquivos de teste.</p>
<p>Exemplo de teste de uma a&#xE7;&#xE3;o ass&#xED;ncrona:</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">// uso a sintaxe &apos;require&apos; para inline loaders.</span>
<span class="token comment" spellcheck="true">// com inject-loader, isso retorna uma factory de m&#xF3;dulos</span>
<span class="token comment" spellcheck="true">// que nos permite injetar depend&#xEA;ncias simuladas. import { expect } from &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">// crie o m&#xF3;dulo com nossos mocks</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">/* mocked response */</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">// ajudante para teste de a&#xE7;&#xE3;o com muta&#xE7;&#xF5;es esperadas</span>
<span class="token keyword">const</span> testAction <span class="token operator">=</span> <span class="token punctuation">(</span>action<span class="token punctuation">,</span> payload<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">// mock commit</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>mutation<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>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>mutation<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>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">// chame a a&#xE7;&#xE3;o com uma loja e argumentos simulados</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> payload<span class="token punctuation">)</span>

  <span class="token comment" spellcheck="true">// verificar se nenhuma muta&#xE7;&#xE3;o deveria ter sido enviada</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 keyword">null</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="testando-getters">Testando Getters</h3>
<p>Se seus getters tiverem uma computa&#xE7;&#xE3;o complicada, vale a pena test&#xE1;-los. Os Getters tamb&#xE9;m s&#xE3;o muito diretos para testar o mesmo motivo que as muta&#xE7;&#xF5;es.</p>
<p>Exemplo testando um getter:</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">// mock state</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">// mock getter</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">// obter o resultado do getter</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">// afirma o resultado</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="execu&#xE7;&#xE3;o-de-testes">Execu&#xE7;&#xE3;o de testes</h3>
<p>Se suas muta&#xE7;&#xF5;es e a&#xE7;&#xF5;es estiverem escritas corretamente, os testes n&#xE3;o devem ter depend&#xEA;ncia direta das APIs do navegador ap&#xF3;s uma mudan&#xE7;a apropriada. Assim, voc&#xEA; pode simplesmente agrupar os testes com o webpack e execut&#xE1;-lo diretamente no Node. Alternativamente, voc&#xEA; pode usar <code>mocha-loader</code> ou Karma +<code>karma-webpack</code> para executar os testes em navegadores reais.</p>
<h4 id="rodando-no-node">Rodando no Node</h4>
<p>Crie a seguinte configura&#xE7;&#xE3;o de webpack (juntamente com <a href="https://babeljs.io/docs/usage/babelrc/" target="_blank"><code>.babelrc</code></a>):</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>Ent&#xE3;o:</p>
<pre class="language-"><code class="lang-bash">webpack
mocha test-bundle.js
</code></pre>
<h4 id="rodando-no-browser">Rodando no Browser</h4>
<ol>
<li>Instale <code>mocha-loader</code>.</li>
<li>Mude a <code>entrada</code> da configura&#xE7;&#xE3;o do webpack acima para <code>&apos;mocha-loader! Babel-loader! ./ test.js&apos;</code>.</li>
<li>Inicie <code>webpack-dev-server</code> usando a configura&#xE7;&#xE3;o.</li>
<li>V&#xE1; para <code>localhost: 8080 / webpack-dev-server / test-bundle</code>.</li>
</ol>
<h4 id="rodando-no-browser-com-karma--karma-webpack">Rodando no Browser com Karma + karma-webpack</h4>
<p>Consulte a instala&#xE7;&#xE3;o na <a href="https://vue-loader.vuejs.org/pt_BR/workflow/testing.html" target="_blank">documenta&#xE7;&#xE3;o do vue-loader</a>.</p>

                                
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