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a utilies library reduce boilerplate for vuex
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Vuex가 무엇인가요?
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Getters
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변이
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액션
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테스팅
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<a href="." >테스팅</a>
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<h1 id="테스팅">테스팅</h1>
<p>Vuex에서 단위 테스트를 하고자 하는 주요 부분은 변이와 액션입니다.</p>
<h3 id="변이-테스팅">변이 테스팅</h3>
<p>변이는 테스트하기 매우 간단합니다. 왜냐하면 변이는 전달인자에 완전히 의존하는 함수이기 때문입니다. 한 가지 트릭은 ES2015 모듈을 사용하고 <code>store.js</code> 파일에 변이를 넣는다면 기본 내보내기와 함께 변이를 명명된 내보내기로 내보낼 수 있다는 것입니다.</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">// 변이를 이름을 가지는 내보내기를 이용하여 내보냅니다.</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>Mocha + Chai를 사용하여 변이를 테스팅 하는 예(원하는 프레임워크/assertion 라이브러리를 사용할 수 있습니다.)</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">></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">'chai'</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">'./store'</span>
<span class="token comment" spellcheck="true">// 변이 가져오기</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">'mutations'</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">></span> <span class="token punctuation">{</span>
<span class="token function">it</span><span class="token punctuation">(</span><span class="token string">'INCREMENT'</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">></span> <span class="token punctuation">{</span>
<span class="token comment" spellcheck="true">// mock 상태</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">// 변이 적용</span>
<span class="token function">increment</span><span class="token punctuation">(</span>state<span class="token punctuation">)</span>
<span class="token comment" spellcheck="true">// 결과 확인</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="액션-테스팅">액션 테스팅</h3>
<p>액션은 외부 API를 호출 할 수 있기 때문에 좀 더 까다로울 수 있습니다. 액션을 테스트 할 때 우리는 일반적으로 조작을 어느 정도 해야합니다. 예를 들어 API 호출을 서비스로 추상화하고 테스트 내에서 해당 서비스를 조작 할 수 있습니다. 의존성을 쉽게 모방하기 위해 webpack과 <a href="https://github.com/plasticine/inject-loader" target="_blank">inject-loader</a>를 사용하여 테스트 파일을 묶을 수 있습니다.</p>
<p>비동기 액션 테스트 예제:</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">'../api/shop'</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">></span> <span class="token punctuation">{</span>
<span class="token function">commit</span><span class="token punctuation">(</span><span class="token string">'REQUEST_PRODUCTS'</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">></span> <span class="token punctuation">{</span>
<span class="token function">commit</span><span class="token punctuation">(</span><span class="token string">'RECEIVE_PRODUCTS'</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">// 인라인 로더에는 require 구문을 사용하십시오.</span>
<span class="token comment" spellcheck="true">// inject-loader를 사용하면 조작된 의존성을</span>
<span class="token comment" spellcheck="true">// 주입 할 수있는 모듈 팩토리가 반환됩니다.</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">'chai'</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">'inject-loader!./actions'</span><span class="token punctuation">)</span>
<span class="token comment" spellcheck="true">// 조작된 모의 응답과 함께 모듈 생성</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">'../api/shop'</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">></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">/* 모의 응답 */</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">// 예상되는 변이와 함께 테스팅 액션을 도와주는 헬퍼</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">></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">// 모의 커밋</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">></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">>=</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">// 모의 저장소와 전달인자로 액션을 부릅니다.</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">// 디스패치된 변이가 없는지 확인</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">'actions'</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">></span> <span class="token punctuation">{</span>
<span class="token function">it</span><span class="token punctuation">(</span><span class="token string">'getAllProducts'</span><span class="token punctuation">,</span> done <span class="token operator">=</span><span class="token operator">></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">'REQUEST_PRODUCTS'</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">'RECEIVE_PRODUCTS'</span><span class="token punctuation">,</span> payload<span class="token punctuation">:</span> <span class="token punctuation">{</span> <span class="token comment" spellcheck="true">/* 모의 응답 */</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="getters-테스팅">Getters 테스팅</h3>
<p>Getter에 복잡한 연산이 있는 경우 테스트하는 것이 좋습니다. Getter는 변이와 같은 이유로 테스트하는 것이 매우 간단합니다.</p>
<p>getter 테스팅 예제:</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">></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">'chai'</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">'./getters'</span>
<span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'getters'</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">></span> <span class="token punctuation">{</span>
<span class="token function">it</span><span class="token punctuation">(</span><span class="token string">'filteredProducts'</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">></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">'Apple'</span><span class="token punctuation">,</span> category<span class="token punctuation">:</span> <span class="token string">'fruit'</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">'Orange'</span><span class="token punctuation">,</span> category<span class="token punctuation">:</span> <span class="token string">'fruit'</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">'Carrot'</span><span class="token punctuation">,</span> category<span class="token punctuation">:</span> <span class="token string">'vegetable'</span> <span class="token punctuation">}</span>
<span class="token punctuation">]</span>
<span class="token punctuation">}</span>
<span class="token comment" spellcheck="true">// 모의 getter</span>
<span class="token keyword">const</span> filterCategory <span class="token operator">=</span> <span class="token string">'fruit'</span>
<span class="token comment" spellcheck="true">// getter로 부터 결과를 받습니다</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">// 결과 테스트</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">'Apple'</span><span class="token punctuation">,</span> category<span class="token punctuation">:</span> <span class="token string">'fruit'</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">'Orange'</span><span class="token punctuation">,</span> category<span class="token punctuation">:</span> <span class="token string">'fruit'</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="테스트-실행">테스트 실행</h3>
<p>변이와 액션이 제대로 작성되면 적절한 모의 조작을 한 후 브라우저 API에 직접적인 의존성이 없어야합니다. 따라서 webpack을 사용하여 테스트를 번들로 묶어 Node를 이용해 직접 실행할 수 있습니다. 또는, <code>mocha-loader</code> 나 Karma + <code>karma-webpack</code>을 사용하여 실제 브라우저에서 테스트를 실행할 수 있습니다.</p>
<h4 id="node를-이용한-실행">Node를 이용한 실행</h4>
<p>다음과 같이 webpack 설정을 하십시오 (<a href="https://babeljs.io/docs/usage/babelrc/" target="_blank"><code>.babelrc</code></a>도 함께 필요 합니다.)</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">'./test.js'</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">'test-bundle.js'</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">'babel-loader'</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>이제,</p>
<pre class="language-"><code class="lang-bash">webpack
mocha test-bundle.js
</code></pre>
<h4 id="브라우저에서-테스팅">브라우저에서 테스팅</h4>
<ol>
<li><code>mocha-loader</code>를 설치하세요.</li>
<li>webpack 설정에서 <code>entry</code>를 <code>'mocha!babel!./test.js'</code>로 변경하세요.</li>
<li>설정을 이용하여 <code>webpack-dev-server</code>를 실행하세요.</li>
<li><code>localhost:8080/webpack-dev-server/test-bundle</code>로 가세요.</li>
</ol>
<h4 id="브라우저와-karma--karma-webpack을-이용한-테스팅">브라우저와 Karma + karma-webpack을 이용한 테스팅</h4>
<p><a href="http://vue-loader.vuejs.org/en/workflow/testing.html" target="_blank">vue-loader 문서</a>를 확인하세요.</p>
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