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  25.     <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav>  <ul class="sidebar-links"><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>初识 TypeScript</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>TypeScript 常用语法</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 项目初始化</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 基础功能实现</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 异常情况处理</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 接口扩展</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 拦截器实现</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 配置化实现</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 取消功能实现</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 更多功能实现</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>ts-axios 单元测试</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/blog/pages/df36888424843793/" class="sidebar-link">前言</a></li><li><a href="/blog/pages/bf5c625a35757b37/" class="sidebar-link">Jest 安装和配置</a></li><li><a href="/blog/pages/13f147a9b355c4c1/" class="sidebar-link">辅助模块单元测试</a></li><li><a href="/blog/pages/e1d15dec8634e6b5/" class="sidebar-link">请求模块单元测试</a></li><li><a href="/blog/pages/ddd86ec39b5dfe33/" class="sidebar-link">headers 模块单元测试</a></li><li><a href="/blog/pages/2eac7a0a0d644c15/" class="sidebar-link">Axios 实例模块单元测试</a></li><li><a href="/blog/pages/97de6fd6293a2c6e/" class="sidebar-link">拦截器模块单元测试</a></li><li><a href="/blog/pages/cdf59840306f9e81/" aria-current="page" class="active sidebar-link">mergeConfig 模块单元测试</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header level2"><a href="/blog/pages/cdf59840306f9e81/#测试代码编写" class="sidebar-link">测试代码编写</a></li></ul></li><li><a href="/blog/pages/6fa16aee29527032/" class="sidebar-link">请求取消模块单元测试</a></li><li><a href="/blog/pages/9572134781ba6a25/" class="sidebar-link">剩余模块单元测试</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 部署与发布</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <div><main class="page"><div class="theme-vdoing-wrapper "><div class="articleInfo-wrap" data-v-06225672><div class="articleInfo" data-v-06225672><ul class="breadcrumbs" data-v-06225672><li data-v-06225672><a href="/blog/" title="首页" class="iconfont icon-home router-link-active" data-v-06225672></a></li> <li data-v-06225672><a href="/blog/note/typescript-axios/#《TypeScript 从零实现 axios》" data-v-06225672>《TypeScript 从零实现 axios》</a></li><li data-v-06225672><a href="/blog/note/typescript-axios/#ts-axios 单元测试" data-v-06225672>ts-axios 单元测试</a></li></ul> <div class="info" data-v-06225672><div title="作者" class="author iconfont icon-touxiang" data-v-06225672><a href="javascript:;" data-v-06225672>HuangYi</a></div> <div title="创建时间" class="date iconfont icon-riqi" data-v-06225672><a href="javascript:;" data-v-06225672>2020-01-05</a></div> <!----></div></div></div> <!----> <div class="content-wrapper"><div class="right-menu-wrapper"><div class="right-menu-margin"><div class="right-menu-title">目录</div> <div class="right-menu-content"></div></div></div> <h1><img src="data:image/png;base64,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">mergeConfig 模块单元测试<!----></h1>  <div class="theme-vdoing-content content__default"><h1 id="mergeconfig-模块单元测试"><a href="#mergeconfig-模块单元测试" class="header-anchor">#</a> mergeConfig 模块单元测试</h1> <p>合并配置是 <code>ts-axios</code> 核心流程中非常重要的一个环节，我们需要为它的各种情况去编写测试。</p> <h2 id="测试代码编写"><a href="#测试代码编写" class="header-anchor">#</a> 测试代码编写</h2> <p><code>test/mergeConfig.spec.ts</code>：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">import</span> axios <span class="token keyword">from</span> <span class="token string">'../src/index'</span>
    26. 

  26. <span class="token keyword">import</span> mergeConfig <span class="token keyword">from</span> <span class="token string">'../src/core/mergeConfig'</span>
    27. 

  27. 

  28. <span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'mergeConfig'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    29. 

  29.   <span class="token keyword">const</span> defaults <span class="token operator">=</span> axios<span class="token punctuation">.</span>defaults
    30. 

  30. 

  31.   <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should accept undefined for second argument'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    32. 

  32.     <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">mergeConfig</span><span class="token punctuation">(</span>defaults<span class="token punctuation">,</span> <span class="token keyword">undefined</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toEqual</span><span class="token punctuation">(</span>defaults<span class="token punctuation">)</span>
    33. 

  33.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    34. 

  34. 

  35.   <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should accept an object for second argument'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    36. 

  36.     <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">mergeConfig</span><span class="token punctuation">(</span>defaults<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 function">toEqual</span><span class="token punctuation">(</span>defaults<span class="token punctuation">)</span>
    37. 

  37.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    38. 

  38. 

  39.   <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should not leave references'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    40. 

  40.     <span class="token keyword">const</span> merged <span class="token operator">=</span> <span class="token function">mergeConfig</span><span class="token punctuation">(</span>defaults<span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    41. 

  41.     <span class="token function">expect</span><span class="token punctuation">(</span>merged<span class="token punctuation">)</span><span class="token punctuation">.</span>not<span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span>defaults<span class="token punctuation">)</span>
    42. 

  42.     <span class="token function">expect</span><span class="token punctuation">(</span>merged<span class="token punctuation">.</span>headers<span class="token punctuation">)</span><span class="token punctuation">.</span>not<span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span>defaults<span class="token punctuation">.</span>headers<span class="token punctuation">)</span>
    43. 

  43.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    44. 

  44. 

  45.   <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should allow setting request options'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    46. 

  46.     <span class="token keyword">const</span> config <span class="token operator">=</span> <span class="token punctuation">{</span>
    47. 

  47.       url<span class="token operator">:</span> <span class="token string">'__sample url__'</span><span class="token punctuation">,</span>
    48. 

  48.       params<span class="token operator">:</span> <span class="token string">'__sample params__'</span><span class="token punctuation">,</span>
    49. 

  49.       data<span class="token operator">:</span> <span class="token punctuation">{</span> foo<span class="token operator">:</span> <span class="token boolean">true</span> <span class="token punctuation">}</span>
    50. 

  50.     <span class="token punctuation">}</span>
    51. 

  51.     <span class="token keyword">const</span> merged <span class="token operator">=</span> <span class="token function">mergeConfig</span><span class="token punctuation">(</span>defaults<span class="token punctuation">,</span> config<span class="token punctuation">)</span>
    52. 

  52.     <span class="token function">expect</span><span class="token punctuation">(</span>merged<span class="token punctuation">.</span>url<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span>config<span class="token punctuation">.</span>url<span class="token punctuation">)</span>
    53. 

  53.     <span class="token function">expect</span><span class="token punctuation">(</span>merged<span class="token punctuation">.</span>params<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span>config<span class="token punctuation">.</span>params<span class="token punctuation">)</span>
    54. 

  54.     <span class="token function">expect</span><span class="token punctuation">(</span>merged<span class="token punctuation">.</span>data<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toEqual</span><span class="token punctuation">(</span>config<span class="token punctuation">.</span>data<span class="token punctuation">)</span>
    55. 

  55.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    56. 

  56. 

  57.   <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should not inherit request options'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    58. 

  58.     <span class="token keyword">const</span> localDefaults <span class="token operator">=</span> <span class="token punctuation">{</span>
    59. 

  59.       url<span class="token operator">:</span> <span class="token string">'__sample url__'</span><span class="token punctuation">,</span>
    60. 

  60.       params<span class="token operator">:</span> <span class="token string">'__sample params__'</span><span class="token punctuation">,</span>
    61. 

  61.       data<span class="token operator">:</span> <span class="token punctuation">{</span> foo<span class="token operator">:</span> <span class="token boolean">true</span> <span class="token punctuation">}</span>
    62. 

  62.     <span class="token punctuation">}</span>
    63. 

  63.     <span class="token keyword">const</span> merged <span class="token operator">=</span> <span class="token function">mergeConfig</span><span class="token punctuation">(</span>localDefaults<span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    64. 

  64.     <span class="token function">expect</span><span class="token punctuation">(</span>merged<span class="token punctuation">.</span>url<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeUndefined</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    65. 

  65.     <span class="token function">expect</span><span class="token punctuation">(</span>merged<span class="token punctuation">.</span>params<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeUndefined</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    66. 

  66.     <span class="token function">expect</span><span class="token punctuation">(</span>merged<span class="token punctuation">.</span>data<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeUndefined</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    67. 

  67.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    68. 

  68. 

  69.   <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should return default headers if pass config2 with undefined'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    70. 

  70.     <span class="token function">expect</span><span class="token punctuation">(</span>
    71. 

  71.       <span class="token function">mergeConfig</span><span class="token punctuation">(</span>
    72. 

  72.         <span class="token punctuation">{</span>
    73. 

  73.           headers<span class="token operator">:</span> <span class="token string">'x-mock-header'</span>
    74. 

  74.         <span class="token punctuation">}</span><span class="token punctuation">,</span>
    75. 

  75.         <span class="token keyword">undefined</span>
    76. 

  76.       <span class="token punctuation">)</span>
    77. 

  77.     <span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toEqual</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
    78. 

  78.       headers<span class="token operator">:</span> <span class="token string">'x-mock-header'</span>
    79. 

  79.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    80. 

  80.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    81. 

  81. 

  82.   <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should merge auth, headers with defaults'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    83. 

  83.     <span class="token function">expect</span><span class="token punctuation">(</span>
    84. 

  84.       <span class="token function">mergeConfig</span><span class="token punctuation">(</span>
    85. 

  85.         <span class="token punctuation">{</span>
    86. 

  86.           auth<span class="token operator">:</span> <span class="token keyword">undefined</span>
    87. 

  87.         <span class="token punctuation">}</span><span class="token punctuation">,</span>
    88. 

  88.         <span class="token punctuation">{</span>
    89. 

  89.           auth<span class="token operator">:</span> <span class="token punctuation">{</span>
    90. 

  90.             username<span class="token operator">:</span> <span class="token string">'foo'</span><span class="token punctuation">,</span>
    91. 

  91.             password<span class="token operator">:</span> <span class="token string">'test'</span>
    92. 

  92.           <span class="token punctuation">}</span>
    93. 

  93.         <span class="token punctuation">}</span>
    94. 

  94.       <span class="token punctuation">)</span>
    95. 

  95.     <span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toEqual</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
    96. 

  96.       auth<span class="token operator">:</span> <span class="token punctuation">{</span>
    97. 

  97.         username<span class="token operator">:</span> <span class="token string">'foo'</span><span class="token punctuation">,</span>
    98. 

  98.         password<span class="token operator">:</span> <span class="token string">'test'</span>
    99. 

  99.       <span class="token punctuation">}</span>
    100. 

  100.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    101. 

  101.     <span class="token function">expect</span><span class="token punctuation">(</span>
    102. 

  102.       <span class="token function">mergeConfig</span><span class="token punctuation">(</span>
    103. 

  103.         <span class="token punctuation">{</span>
    104. 

  104.           auth<span class="token operator">:</span> <span class="token punctuation">{</span>
    105. 

  105.             username<span class="token operator">:</span> <span class="token string">'foo'</span><span class="token punctuation">,</span>
    106. 

  106.             password<span class="token operator">:</span> <span class="token string">'test'</span>
    107. 

  107.           <span class="token punctuation">}</span>
    108. 

  108.         <span class="token punctuation">}</span><span class="token punctuation">,</span>
    109. 

  109.         <span class="token punctuation">{</span>
    110. 

  110.           auth<span class="token operator">:</span> <span class="token punctuation">{</span>
    111. 

  111.             username<span class="token operator">:</span> <span class="token string">'baz'</span><span class="token punctuation">,</span>
    112. 

  112.             password<span class="token operator">:</span> <span class="token string">'foobar'</span>
    113. 

  113.           <span class="token punctuation">}</span>
    114. 

  114.         <span class="token punctuation">}</span>
    115. 

  115.       <span class="token punctuation">)</span>
    116. 

  116.     <span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toEqual</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
    117. 

  117.       auth<span class="token operator">:</span> <span class="token punctuation">{</span>
    118. 

  118.         username<span class="token operator">:</span> <span class="token string">'baz'</span><span class="token punctuation">,</span>
    119. 

  119.         password<span class="token operator">:</span> <span class="token string">'foobar'</span>
    120. 

  120.       <span class="token punctuation">}</span>
    121. 

  121.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    122. 

  122.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    123. 

  123. 

  124.   <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should overwrite auth, headers with a non-object value'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    125. 

  125.     <span class="token function">expect</span><span class="token punctuation">(</span>
    126. 

  126.       <span class="token function">mergeConfig</span><span class="token punctuation">(</span>
    127. 

  127.         <span class="token punctuation">{</span>
    128. 

  128.           headers<span class="token operator">:</span> <span class="token punctuation">{</span>
    129. 

  129.             common<span class="token operator">:</span> <span class="token punctuation">{</span>
    130. 

  130.               Accept<span class="token operator">:</span> <span class="token string">'application/json, text/plain, */*'</span>
    131. 

  131.             <span class="token punctuation">}</span>
    132. 

  132.           <span class="token punctuation">}</span>
    133. 

  133.         <span class="token punctuation">}</span><span class="token punctuation">,</span>
    134. 

  134.         <span class="token punctuation">{</span>
    135. 

  135.           headers<span class="token operator">:</span> <span class="token keyword">null</span>
    136. 

  136.         <span class="token punctuation">}</span>
    137. 

  137.       <span class="token punctuation">)</span>
    138. 

  138.     <span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toEqual</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
    139. 

  139.       headers<span class="token operator">:</span> <span class="token keyword">null</span>
    140. 

  140.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    141. 

  141.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    142. 

  142. 

  143.   <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should allow setting other options'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    144. 

  144.     <span class="token keyword">const</span> merged <span class="token operator">=</span> <span class="token function">mergeConfig</span><span class="token punctuation">(</span>defaults<span class="token punctuation">,</span> <span class="token punctuation">{</span>
    145. 

  145.       timeout<span class="token operator">:</span> <span class="token number">123</span>
    146. 

  146.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    147. 

  147.     <span class="token function">expect</span><span class="token punctuation">(</span>merged<span class="token punctuation">.</span>timeout<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token number">123</span><span class="token punctuation">)</span>
    148. 

  148.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    149. 

  149. <span class="token punctuation">}</span><span class="token punctuation">)</span>
    150. 

  150. </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span class="line-number">50</span><br><span class="line-number">51</span><br><span class="line-number">52</span><br><span class="line-number">53</span><br><span class="line-number">54</span><br><span class="line-number">55</span><br><span class="line-number">56</span><br><span class="line-number">57</span><br><span class="line-number">58</span><br><span class="line-number">59</span><br><span class="line-number">60</span><br><span class="line-number">61</span><br><span class="line-number">62</span><br><span class="line-number">63</span><br><span class="line-number">64</span><br><span class="line-number">65</span><br><span class="line-number">66</span><br><span class="line-number">67</span><br><span class="line-number">68</span><br><span class="line-number">69</span><br><span class="line-number">70</span><br><span class="line-number">71</span><br><span class="line-number">72</span><br><span class="line-number">73</span><br><span class="line-number">74</span><br><span class="line-number">75</span><br><span class="line-number">76</span><br><span class="line-number">77</span><br><span class="line-number">78</span><br><span class="line-number">79</span><br><span class="line-number">80</span><br><span class="line-number">81</span><br><span class="line-number">82</span><br><span class="line-number">83</span><br><span class="line-number">84</span><br><span class="line-number">85</span><br><span class="line-number">86</span><br><span class="line-number">87</span><br><span class="line-number">88</span><br><span class="line-number">89</span><br><span class="line-number">90</span><br><span class="line-number">91</span><br><span class="line-number">92</span><br><span class="line-number">93</span><br><span class="line-number">94</span><br><span class="line-number">95</span><br><span class="line-number">96</span><br><span class="line-number">97</span><br><span class="line-number">98</span><br><span class="line-number">99</span><br><span class="line-number">100</span><br><span class="line-number">101</span><br><span class="line-number">102</span><br><span class="line-number">103</span><br><span class="line-number">104</span><br><span class="line-number">105</span><br><span class="line-number">106</span><br><span class="line-number">107</span><br><span class="line-number">108</span><br><span class="line-number">109</span><br><span class="line-number">110</span><br><span class="line-number">111</span><br><span class="line-number">112</span><br><span class="line-number">113</span><br><span class="line-number">114</span><br><span class="line-number">115</span><br><span class="line-number">116</span><br><span class="line-number">117</span><br><span class="line-number">118</span><br><span class="line-number">119</span><br><span class="line-number">120</span><br><span class="line-number">121</span><br><span class="line-number">122</span><br><span class="line-number">123</span><br><span class="line-number">124</span><br><span class="line-number">125</span><br></div></div><p>运行测试后我们发现 <code>mergeConfig.ts</code> 文件的分支覆盖率并未达到 100%，提示是 23 行，打开文件后发现最后一个 <code>else</code> 逻辑并未走到，也就是 <code>val1</code> 为 <code>undefined</code> 的情况。但实际上即使 <code>val1</code> 为 <code>undefined</code>，我们也是返回 <code>undefined</code>，也就是返回 <code>val1</code>，所以这块代码的逻辑可以优化。</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">function</span> <span class="token function">deepMergeStrat</span><span class="token punctuation">(</span>val1<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">,</span> val2<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token builtin">any</span> <span class="token punctuation">{</span>
    151. 

  151.   <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">isPlainObject</span><span class="token punctuation">(</span>val2<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    152. 

  152.     <span class="token keyword">return</span> <span class="token function">deepMerge</span><span class="token punctuation">(</span>val1<span class="token punctuation">,</span> val2<span class="token punctuation">)</span>
    153. 

  153.   <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">typeof</span> val2 <span class="token operator">!==</span> <span class="token string">'undefined'</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    154. 

  154.     <span class="token keyword">return</span> val2
    155. 

  155.   <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">isPlainObject</span><span class="token punctuation">(</span>val1<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    156. 

  156.     <span class="token keyword">return</span> <span class="token function">deepMerge</span><span class="token punctuation">(</span>val1<span class="token punctuation">)</span>
    157. 

  157.   <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
    158. 

  158.     <span class="token keyword">return</span> val1
    159. 

  159.   <span class="token punctuation">}</span>
    160. 

  160. <span class="token punctuation">}</span>
    161. 

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