vuex-help
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a utilies library reduce boilerplate for vuex
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Vuex とは何か?
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Vuex 入門
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ステート
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ゲッター
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ミューテーション
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アクション
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テスト
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<h1 id="テスト">テスト</h1>
<p>私たちが Vuex でユニットテストしたい主な部分はミューテーションとアクションです。</p>
<h3 id="ミューテーションのテスト">ミューテーションのテスト</h3>
<p>ミューテーションは完全に引数に依存しているだけの関数であるため、テストするのがとても簡単です。効果的なやり方として、もし ES2015 のモジュールを使っていて <code>store.js</code> ファイルの中にミューテーションがあるなら、デフォルトエクスポートに加えて、名前付きエクスポートでミューテーションをエクスポートできます。</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">// 名前付きエクスポートでミューテーションをエクスポートする</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 + Chai を使用してミューテーションをテストする例です(あなたの好きな任意のフレームワーク/アサーションライブラリを使用できます):</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">// ミューテーションの分割束縛</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">// ステートのモック</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">// ミューテーションを適用する</span>
<span class="token function">increment</span><span class="token punctuation">(</span>state<span class="token punctuation">)</span>
<span class="token comment" spellcheck="true">// 結果を検証する</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="アクションのテスト">アクションのテスト</h3>
<p>アクションは外部の API を呼び出す可能性があるため、ミューテーションのテストよりも少し注意が必要です。アクションをテストするとき、通常、いくつかの段階でモックを作る必要があります。例えば API 呼び出しをサービスとして抽象化し、そしてテストの内部ではそのサービスをモックにすることができます。簡単に依存関係をモック化するために、webpack と <a href="https://github.com/plasticine/inject-loader" target="_blank">inject-loader</a> を使ってテストファイルをバンドルすることができます。</p>
<p>非同期なアクションのテストの例:</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">// inline loader のために require 構文を使用する</span>
<span class="token comment" spellcheck="true">// ここでは inject-loader を使って、モック化された依存関係を注入できるようにするモジュールファクトリーを返す</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">// モックによってモジュールを作成する</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">/* レスポンスのモック */</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">// 期待されるミューテーションをアクションが呼び出すかをテストするためのヘルパー</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">// コミットをモックする</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">// モック化したストアと引数でアクションを呼び出す</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">// 呼び出されるべきミューテーションが残っていないか確認する</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">/* レスポンスのモック */</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="ゲッターのテスト">ゲッターのテスト</h3>
<p>もしゲッターが複雑な計算を行っているならば、テストコードを書く価値があります。ゲッターはミューテーションと同様の理由でテストしやすいです。</p>
<p>ゲッターのテストの例:</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">// ステートをモックする</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">// ゲッターをモックする</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">// ゲッターから結果を受け取る</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">// 結果を検証する</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="テストの実行">テストの実行</h3>
<p>ミューテーションやアクションが適切に書かれている場合は、適切にモック化された後、テストコードはブラウザの API に直接依存関係を持つことはないでしょう。したがって、単純に webpack でテストをバンドルでき、それを直接 Node で実行できます。別の方法として、本当のブラウザでテストを実行するためには <code>mocha-loader</code> または Karma + <code>karma-webpack</code> を使用できます。</p>
<h4 id="node-での実行">Node での実行</h4>
<p>以下のような webpack の設定を作成します(<a href="https://babeljs.io/docs/usage/babelrc/" target="_blank"><code>.babelrc</code></a> もあわせて使います):</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>それから下記コマンドを実行します:</p>
<pre class="language-"><code class="lang-bash">webpack
mocha test-bundle.js
</code></pre>
<h4 id="ブラウザでの実行">ブラウザでの実行</h4>
<ol>
<li><code>mocha-loader</code> をインストールする</li>
<li>上記 webpack 設定から <code>entry</code> を <code>'mocha-loader!babel-loader!./test.js'</code> に変更する</li>
<li>設定を使用して <code>webpack-dev-server</code> を開始する</li>
<li>ブラウザで <code>localhost:8080/webpack-dev-server/test-bundle</code> を開く </li>
</ol>
<h4 id="karma--karma-webpack-を使ったブラウザでの実行">Karma + karma-webpack を使ったブラウザでの実行</h4>
<p><a href="https://vue-loader.vuejs.org/ja/workflow/testing.html" target="_blank">vue-loader ドキュメント</a> 内のセットアップ方法を参考にしてください。</p>
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