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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/" aria-current="page" class="active sidebar-link">辅助模块单元测试</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header level2"><a href="/blog/pages/13f147a9b355c4c1/#准备工作" class="sidebar-link">准备工作</a></li><li class="sidebar-sub-header level2"><a href="/blog/pages/13f147a9b355c4c1/#util-模块测试" class="sidebar-link">util 模块测试</a></li><li class="sidebar-sub-header level2"><a href="/blog/pages/13f147a9b355c4c1/#cookie-模块测试" class="sidebar-link">cookie 模块测试</a></li><li class="sidebar-sub-header level2"><a href="/blog/pages/13f147a9b355c4c1/#data-模块测试" class="sidebar-link">data 模块测试</a></li><li class="sidebar-sub-header level2"><a href="/blog/pages/13f147a9b355c4c1/#error-模块测试" class="sidebar-link">error 模块测试</a></li><li class="sidebar-sub-header level2"><a href="/blog/pages/13f147a9b355c4c1/#headers-模块测试" class="sidebar-link">headers 模块测试</a></li><li class="sidebar-sub-header level2"><a href="/blog/pages/13f147a9b355c4c1/#url-模块测试" class="sidebar-link">url 模块测试</a></li></ul></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/" class="sidebar-link">mergeConfig 模块单元测试</a></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-06970110><div class="articleInfo" data-v-06970110><ul class="breadcrumbs" data-v-06970110><li data-v-06970110><a href="/blog/" title="首页" class="iconfont icon-home router-link-active" data-v-06970110></a></li> <li data-v-06970110><a href="/blog/note/typescript-axios/#《TypeScript 从零实现 axios》" data-v-06970110>《TypeScript 从零实现 axios》</a></li><li data-v-06970110><a href="/blog/note/typescript-axios/#ts-axios 单元测试" data-v-06970110>ts-axios 单元测试</a></li></ul> <div class="info" data-v-06970110><div title="作者" class="author iconfont icon-touxiang" data-v-06970110><a href="javascript:;" data-v-06970110>HuangYi</a></div> <div title="创建时间" class="date iconfont icon-riqi" data-v-06970110><a href="javascript:;" data-v-06970110>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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">辅助模块单元测试<!----></h1>  <div class="theme-vdoing-content content__default"><h1 id="辅助模块单元测试"><a href="#辅助模块单元测试" class="header-anchor">#</a> 辅助模块单元测试</h1> <h2 id="准备工作"><a href="#准备工作" class="header-anchor">#</a> 准备工作</h2> <p>通常我们会优先为一个库的辅助方法编写测试，我们会优先为 <code>ts-axios</code> 库的 <code>helpers</code> 目录下的模块编写测试。我们在 <code>test</code> 目录下创建一个 <code>helpers</code> 目录，创建一个 <code>boot.ts</code> 空文件，这个是因为我们上节课给 Jest 配置了 <code>setupFilesAfterEnv</code> 指向了这个文件，后面的章节我们会编写这个文件。</p> <p>然后我们可以在控制台运行 <code>npm test</code>，它实际上是执行了 <code>jest --coverage</code> 来跑单元测试，我们会发现它会报错，没有匹配的测试文件，那是因为我们还没有在 <code>test</code> 目录下编写任何一个 .spec.ts 结尾的测试文件。接下来我们就来为这些辅助模块编写相应的测试。</p> <h2 id="util-模块测试"><a href="#util-模块测试" class="header-anchor">#</a> util 模块测试</h2> <p><code>test/helpers/util.spec.ts</code>：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">import</span> <span class="token punctuation">{</span>
    26. 

  26.   isDate<span class="token punctuation">,</span>
    27. 

  27.   isPlainObject<span class="token punctuation">,</span>
    28. 

  28.   isFormData<span class="token punctuation">,</span>
    29. 

  29.   isURLSearchParams<span class="token punctuation">,</span>
    30. 

  30.   extend<span class="token punctuation">,</span>
    31. 

  31.   deepMerge
    32. 

  32. <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'../../src/helpers/util'</span>
    33. 

  33. 

  34. <span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'helpers:util'</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>
    35. 

  35.   <span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'isXX'</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">test</span><span class="token punctuation">(</span><span class="token string">'should validate Date'</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>
    37. 

  37.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">isDate</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">Date</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">toBeTruthy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    38. 

  38.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">isDate</span><span class="token punctuation">(</span>Date<span class="token punctuation">.</span><span class="token function">now</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">toBeFalsy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    39. 

  39.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    40. 

  40. 

  41.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should validate PlainObject'</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>
    42. 

  42.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">isPlainObject</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 function">toBeTruthy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    43. 

  43.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">isPlainObject</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">Date</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">toBeFalsy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    44. 

  44.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    45. 

  45. 

  46.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should validate FormData'</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>
    47. 

  47.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">isFormData</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">FormData</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">toBeTruthy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    48. 

  48.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">isFormData</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 function">toBeFalsy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    49. 

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

  50. 

  51.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should validate URLSearchParams'</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>
    52. 

  52.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">isURLSearchParams</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">URLSearchParams</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">toBeTruthy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    53. 

  53.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">isURLSearchParams</span><span class="token punctuation">(</span><span class="token string">'foo=1&amp;bar=2'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeFalsy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    54. 

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

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

  56. 

  57.   <span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'extend'</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 function">test</span><span class="token punctuation">(</span><span class="token string">'should be mutable'</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>
    59. 

  59.       <span class="token keyword">const</span> a <span class="token operator">=</span> Object<span class="token punctuation">.</span><span class="token function">create</span><span class="token punctuation">(</span><span class="token keyword">null</span><span class="token punctuation">)</span>
    60. 

  60.       <span class="token keyword">const</span> b <span class="token operator">=</span> <span class="token punctuation">{</span> foo<span class="token operator">:</span> <span class="token number">123</span> <span class="token punctuation">}</span>
    61. 

  61. 

  62.       <span class="token function">extend</span><span class="token punctuation">(</span>a<span class="token punctuation">,</span> b<span class="token punctuation">)</span>
    63. 

  63. 

  64.       <span class="token function">expect</span><span class="token punctuation">(</span>a<span class="token punctuation">.</span>foo<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>
    65. 

  65.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    66. 

  66. 

  67.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should extend properties'</span><span class="token punctuation">,</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    68. 

  68.       <span class="token keyword">const</span> a <span class="token operator">=</span> <span class="token punctuation">{</span> foo<span class="token operator">:</span> <span class="token number">123</span><span class="token punctuation">,</span> bar<span class="token operator">:</span> <span class="token number">456</span> <span class="token punctuation">}</span>
    69. 

  69.       <span class="token keyword">const</span> b <span class="token operator">=</span> <span class="token punctuation">{</span> bar<span class="token operator">:</span> <span class="token number">789</span> <span class="token punctuation">}</span>
    70. 

  70.       <span class="token keyword">const</span> c <span class="token operator">=</span> <span class="token function">extend</span><span class="token punctuation">(</span>a<span class="token punctuation">,</span> b<span class="token punctuation">)</span>
    71. 

  71. 

  72.       <span class="token function">expect</span><span class="token punctuation">(</span>c<span class="token punctuation">.</span>foo<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>
    73. 

  73.       <span class="token function">expect</span><span class="token punctuation">(</span>c<span class="token punctuation">.</span>bar<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">789</span><span class="token punctuation">)</span>
    74. 

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

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

  76. 

  77.   <span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'deepMerge'</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>
    78. 

  78.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should be immutable'</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>
    79. 

  79.       <span class="token keyword">const</span> a <span class="token operator">=</span> Object<span class="token punctuation">.</span><span class="token function">create</span><span class="token punctuation">(</span><span class="token keyword">null</span><span class="token punctuation">)</span>
    80. 

  80.       <span class="token keyword">const</span> b<span class="token operator">:</span> <span class="token builtin">any</span> <span class="token operator">=</span> <span class="token punctuation">{</span> foo<span class="token operator">:</span> <span class="token number">123</span> <span class="token punctuation">}</span>
    81. 

  81.       <span class="token keyword">const</span> c<span class="token operator">:</span> <span class="token builtin">any</span> <span class="token operator">=</span> <span class="token punctuation">{</span> bar<span class="token operator">:</span> <span class="token number">456</span> <span class="token punctuation">}</span>
    82. 

  82. 

  83.       <span class="token function">deepMerge</span><span class="token punctuation">(</span>a<span class="token punctuation">,</span> b<span class="token punctuation">,</span> c<span class="token punctuation">)</span>
    84. 

  84. 

  85.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token keyword">typeof</span> a<span class="token punctuation">.</span>foo<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'undefined'</span><span class="token punctuation">)</span>
    86. 

  86.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token keyword">typeof</span> a<span class="token punctuation">.</span>bar<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'undefined'</span><span class="token punctuation">)</span>
    87. 

  87.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token keyword">typeof</span> b<span class="token punctuation">.</span>bar<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'undefined'</span><span class="token punctuation">)</span>
    88. 

  88.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token keyword">typeof</span> c<span class="token punctuation">.</span>foo<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'undefined'</span><span class="token punctuation">)</span>
    89. 

  89.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    90. 

  90. 

  91.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should deepMerge properties'</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>
    92. 

  92.       <span class="token keyword">const</span> a <span class="token operator">=</span> <span class="token punctuation">{</span> foo<span class="token operator">:</span> <span class="token number">123</span> <span class="token punctuation">}</span>
    93. 

  93.       <span class="token keyword">const</span> b <span class="token operator">=</span> <span class="token punctuation">{</span> bar<span class="token operator">:</span> <span class="token number">456</span> <span class="token punctuation">}</span>
    94. 

  94.       <span class="token keyword">const</span> c <span class="token operator">=</span> <span class="token punctuation">{</span> foo<span class="token operator">:</span> <span class="token number">789</span> <span class="token punctuation">}</span>
    95. 

  95.       <span class="token keyword">const</span> d <span class="token operator">=</span> <span class="token function">deepMerge</span><span class="token punctuation">(</span>a<span class="token punctuation">,</span> b<span class="token punctuation">,</span> c<span class="token punctuation">)</span>
    96. 

  96. 

  97.       <span class="token function">expect</span><span class="token punctuation">(</span>d<span class="token punctuation">.</span>foo<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">789</span><span class="token punctuation">)</span>
    98. 

  98.       <span class="token function">expect</span><span class="token punctuation">(</span>d<span class="token punctuation">.</span>bar<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">456</span><span class="token punctuation">)</span>
    99. 

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

  100. 

  101.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should deepMerge recursively'</span><span class="token punctuation">,</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    102. 

  102.       <span class="token keyword">const</span> a <span class="token operator">=</span> <span class="token punctuation">{</span> foo<span class="token operator">:</span> <span class="token punctuation">{</span> bar<span class="token operator">:</span> <span class="token number">123</span> <span class="token punctuation">}</span> <span class="token punctuation">}</span>
    103. 

  103.       <span class="token keyword">const</span> b <span class="token operator">=</span> <span class="token punctuation">{</span> foo<span class="token operator">:</span> <span class="token punctuation">{</span> baz<span class="token operator">:</span> <span class="token number">456</span> <span class="token punctuation">}</span><span class="token punctuation">,</span> bar<span class="token operator">:</span> <span class="token punctuation">{</span> qux<span class="token operator">:</span> <span class="token number">789</span> <span class="token punctuation">}</span> <span class="token punctuation">}</span>
    104. 

  104.       <span class="token keyword">const</span> c <span class="token operator">=</span> <span class="token function">deepMerge</span><span class="token punctuation">(</span>a<span class="token punctuation">,</span> b<span class="token punctuation">)</span>
    105. 

  105. 

  106.       <span class="token function">expect</span><span class="token punctuation">(</span>c<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>
    107. 

  107.         foo<span class="token operator">:</span> <span class="token punctuation">{</span>
    108. 

  108.           bar<span class="token operator">:</span> <span class="token number">123</span><span class="token punctuation">,</span>
    109. 

  109.           baz<span class="token operator">:</span> <span class="token number">456</span>
    110. 

  110.         <span class="token punctuation">}</span><span class="token punctuation">,</span>
    111. 

  111.         bar<span class="token operator">:</span> <span class="token punctuation">{</span>
    112. 

  112.           qux<span class="token operator">:</span> <span class="token number">789</span>
    113. 

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

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

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

  116. 

  117.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should remove all references from nested objects'</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>
    118. 

  118.       <span class="token keyword">const</span> a <span class="token operator">=</span> <span class="token punctuation">{</span> foo<span class="token operator">:</span> <span class="token punctuation">{</span> bar<span class="token operator">:</span> <span class="token number">123</span> <span class="token punctuation">}</span> <span class="token punctuation">}</span>
    119. 

  119.       <span class="token keyword">const</span> b <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token punctuation">}</span>
    120. 

  120.       <span class="token keyword">const</span> c <span class="token operator">=</span> <span class="token function">deepMerge</span><span class="token punctuation">(</span>a<span class="token punctuation">,</span> b<span class="token punctuation">)</span>
    121. 

  121. 

  122.       <span class="token function">expect</span><span class="token punctuation">(</span>c<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>
    123. 

  123.         foo<span class="token operator">:</span> <span class="token punctuation">{</span>
    124. 

  124.           bar<span class="token operator">:</span> <span class="token number">123</span>
    125. 

  125.         <span class="token punctuation">}</span>
    126. 

  126.       <span class="token punctuation">}</span><span class="token punctuation">)</span>
    127. 

  127. 

  128.       <span class="token function">expect</span><span class="token punctuation">(</span>c<span class="token punctuation">.</span>foo<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>a<span class="token punctuation">.</span>foo<span class="token punctuation">)</span>
    129. 

  129.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    130. 

  130. 

  131.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should handle null and undefined arguments'</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>
    132. 

  132.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">deepMerge</span><span class="token punctuation">(</span><span class="token keyword">undefined</span><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><span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    133. 

  133.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">deepMerge</span><span class="token punctuation">(</span><span class="token keyword">undefined</span><span class="token punctuation">,</span> <span class="token punctuation">{</span> foo<span class="token operator">:</span> <span class="token number">123</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><span class="token punctuation">{</span> foo<span class="token operator">:</span> <span class="token number">123</span> <span class="token punctuation">}</span><span class="token punctuation">)</span>
    134. 

  134.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">deepMerge</span><span class="token punctuation">(</span><span class="token punctuation">{</span> foo<span class="token operator">:</span> <span class="token number">123</span> <span class="token punctuation">}</span><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><span class="token punctuation">{</span> foo<span class="token operator">:</span> <span class="token number">123</span> <span class="token punctuation">}</span><span class="token punctuation">)</span>
    135. 

  135. 

  136.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">deepMerge</span><span class="token punctuation">(</span><span class="token keyword">null</span><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 function">toEqual</span><span class="token punctuation">(</span><span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    137. 

  137.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">deepMerge</span><span class="token punctuation">(</span><span class="token keyword">null</span><span class="token punctuation">,</span> <span class="token punctuation">{</span> foo<span class="token operator">:</span> <span class="token number">123</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><span class="token punctuation">{</span> foo<span class="token operator">:</span> <span class="token number">123</span> <span class="token punctuation">}</span><span class="token punctuation">)</span>
    138. 

  138.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">deepMerge</span><span class="token punctuation">(</span><span class="token punctuation">{</span> foo<span class="token operator">:</span> <span class="token number">123</span> <span class="token punctuation">}</span><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 function">toEqual</span><span class="token punctuation">(</span><span class="token punctuation">{</span> foo<span class="token operator">:</span> <span class="token number">123</span> <span class="token punctuation">}</span><span class="token punctuation">)</span>
    139. 

  139.     <span class="token punctuation">}</span><span class="token punctuation">)</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. </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></div></div><p>其中 <a href="https://jestjs.io/docs/en/api#describename-fn" target="_blank" rel="noopener noreferrer"><code>describe</code><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> 方法用来定义一组测试，它可以支持嵌套，<a href="https://jestjs.io/docs/en/api#testname-fn-timeout" target="_blank" rel="noopener noreferrer"><code>test</code><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> 函数是用来定义单个测试用例，它是测试的最小单元。<a href="https://jestjs.io/docs/en/expect#expectvalue" target="_blank" rel="noopener noreferrer"><code>expect</code><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> 是断言函数，所谓&quot;断言&quot;，就是判断代码的实际执行结果与预期结果是否一致，如果不一致就抛出一个错误。</p> <p>测试文件编写好后，我们可以去控制台运行一次 <code>npm test</code>，看一下测试结果，我们可以看跑了几个测试文件，测试是否通过，测试覆盖率等。</p> <h2 id="cookie-模块测试"><a href="#cookie-模块测试" class="header-anchor">#</a> cookie 模块测试</h2> <p><code>test/helpers/cookie.spec.ts</code>：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">import</span> cookie <span class="token keyword">from</span> <span class="token string">'../../src/helpers/cookie'</span>
    143. 

  143. 

  144. <span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'helpers:cookie'</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>
    145. 

  145.   <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should read cookies'</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>
    146. 

  146.     document<span class="token punctuation">.</span>cookie <span class="token operator">=</span> <span class="token string">'foo=baz'</span>
    147. 

  147.     <span class="token function">expect</span><span class="token punctuation">(</span>cookie<span class="token punctuation">.</span><span class="token function">read</span><span class="token punctuation">(</span><span class="token string">'foo'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'baz'</span><span class="token punctuation">)</span>
    148. 

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

  149. 

  150.   <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should return null if cookie name is not exist'</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>
    151. 

  151.     document<span class="token punctuation">.</span>cookie <span class="token operator">=</span> <span class="token string">'foo=baz'</span>
    152. 

  152.     <span class="token function">expect</span><span class="token punctuation">(</span>cookie<span class="token punctuation">.</span><span class="token function">read</span><span class="token punctuation">(</span><span class="token string">'bar'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeNull</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    153. 

  153.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    154. 

  154. <span class="token punctuation">}</span><span class="token punctuation">)</span>
    155. 

  155. </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></div></div><p>这里我们可以通过 <code>document.cookie</code> 去设置 cookie，就像在浏览器里一样操作。</p> <h2 id="data-模块测试"><a href="#data-模块测试" class="header-anchor">#</a> data 模块测试</h2> <p><code>test/helpers/data.spec.ts</code>：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">import</span> <span class="token punctuation">{</span> transformRequest<span class="token punctuation">,</span> transformResponse <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'../../src/helpers/data'</span>
    156. 

  156. 

  157. <span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'helpers:data'</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>
    158. 

  158.   <span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'transformRequest'</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>
    159. 

  159.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should transform request data to string if data is a PlainObject'</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>
    160. 

  160.       <span class="token keyword">const</span> a <span class="token operator">=</span> <span class="token punctuation">{</span> a<span class="token operator">:</span> <span class="token number">1</span> <span class="token punctuation">}</span>
    161. 

  161.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">transformRequest</span><span class="token punctuation">(</span>a<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'{&quot;a&quot;:1}'</span><span class="token punctuation">)</span>
    162. 

  162.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    163. 

  163. 

  164.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should do nothing if data is not a PlainObject'</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>
    165. 

  165.       <span class="token keyword">const</span> a <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">URLSearchParams</span><span class="token punctuation">(</span><span class="token string">'a=b'</span><span class="token punctuation">)</span>
    166. 

  166.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">transformRequest</span><span class="token punctuation">(</span>a<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span>a<span class="token punctuation">)</span>
    167. 

  167.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    168. 

  168.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    169. 

  169. 

  170.   <span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'transformResponse'</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>
    171. 

  171.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should transform response data to Object if data is a JSON string'</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>
    172. 

  172.       <span class="token keyword">const</span> a <span class="token operator">=</span> <span class="token string">'{&quot;a&quot;: 2}'</span>
    173. 

  173.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">transformResponse</span><span class="token punctuation">(</span>a<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><span class="token punctuation">{</span> a<span class="token operator">:</span> <span class="token number">2</span> <span class="token punctuation">}</span><span class="token punctuation">)</span>
    174. 

  174.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    175. 

  175. 

  176.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should do nothing if data is a string but not a JSON string'</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>
    177. 

  177.       <span class="token keyword">const</span> a <span class="token operator">=</span> <span class="token string">'{a: 2}'</span>
    178. 

  178.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">transformResponse</span><span class="token punctuation">(</span>a<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'{a: 2}'</span><span class="token punctuation">)</span>
    179. 

  179.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    180. 

  180. 

  181.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should do nothing if data is not a string'</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>
    182. 

  182.       <span class="token keyword">const</span> a <span class="token operator">=</span> <span class="token punctuation">{</span> a<span class="token operator">:</span> <span class="token number">2</span> <span class="token punctuation">}</span>
    183. 

  183.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">transformResponse</span><span class="token punctuation">(</span>a<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span>a<span class="token punctuation">)</span>
    184. 

  184.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    185. 

  185.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    186. 

  186. <span class="token punctuation">}</span><span class="token punctuation">)</span>
    187. 

  187. </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></div></div><h2 id="error-模块测试"><a href="#error-模块测试" class="header-anchor">#</a> error 模块测试</h2> <p><code>test/helpers/error.spec.ts</code>：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">import</span> <span class="token punctuation">{</span> createError <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'../../src/helpers/error'</span>
    188. 

  188. <span class="token keyword">import</span> <span class="token punctuation">{</span> AxiosRequestConfig<span class="token punctuation">,</span> AxiosResponse <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'../../src/types'</span>
    189. 

  189. 

  190. <span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'helpers::error'</span><span class="token punctuation">,</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    191. 

  191.   <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should create an Error with message, config, code, request, response and isAxiosError'</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>
    192. 

  192.     <span class="token keyword">const</span> request <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">XMLHttpRequest</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    193. 

  193.     <span class="token keyword">const</span> config<span class="token operator">:</span> AxiosRequestConfig <span class="token operator">=</span> <span class="token punctuation">{</span> method<span class="token operator">:</span> <span class="token string">'post'</span> <span class="token punctuation">}</span>
    194. 

  194.     <span class="token keyword">const</span> response<span class="token operator">:</span> AxiosResponse <span class="token operator">=</span> <span class="token punctuation">{</span>
    195. 

  195.       status<span class="token operator">:</span> <span class="token number">200</span><span class="token punctuation">,</span>
    196. 

  196.       statusText<span class="token operator">:</span> <span class="token string">'OK'</span><span class="token punctuation">,</span>
    197. 

  197.       headers<span class="token operator">:</span> <span class="token keyword">null</span><span class="token punctuation">,</span>
    198. 

  198.       request<span class="token punctuation">,</span>
    199. 

  199.       config<span class="token punctuation">,</span>
    200. 

  200.       data<span class="token operator">:</span> <span class="token punctuation">{</span> foo<span class="token operator">:</span> <span class="token string">'bar'</span> <span class="token punctuation">}</span>
    201. 

  201.     <span class="token punctuation">}</span>
    202. 

  202.     <span class="token keyword">const</span> error <span class="token operator">=</span> <span class="token function">createError</span><span class="token punctuation">(</span><span class="token string">'Boom!'</span><span class="token punctuation">,</span> config<span class="token punctuation">,</span> <span class="token string">'SOMETHING'</span><span class="token punctuation">,</span> request<span class="token punctuation">,</span> response<span class="token punctuation">)</span>
    203. 

  203.     <span class="token function">expect</span><span class="token punctuation">(</span>error <span class="token keyword">instanceof</span> <span class="token class-name">Error</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeTruthy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    204. 

  204.     <span class="token function">expect</span><span class="token punctuation">(</span>error<span class="token punctuation">.</span>message<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'Boom!'</span><span class="token punctuation">)</span>
    205. 

  205.     <span class="token function">expect</span><span class="token punctuation">(</span>error<span class="token punctuation">.</span>config<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>
    206. 

  206.     <span class="token function">expect</span><span class="token punctuation">(</span>error<span class="token punctuation">.</span>code<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'SOMETHING'</span><span class="token punctuation">)</span>
    207. 

  207.     <span class="token function">expect</span><span class="token punctuation">(</span>error<span class="token punctuation">.</span>request<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span>request<span class="token punctuation">)</span>
    208. 

  208.     <span class="token function">expect</span><span class="token punctuation">(</span>error<span class="token punctuation">.</span>response<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span>response<span class="token punctuation">)</span>
    209. 

  209.     <span class="token function">expect</span><span class="token punctuation">(</span>error<span class="token punctuation">.</span>isAxiosError<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeTruthy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    210. 

  210.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    211. 

  211. <span class="token punctuation">}</span><span class="token punctuation">)</span>
    212. 

  212. </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></div></div><p>该模块跑完我们会发现，分支覆盖率是在 <code>50%</code>，因为第十七行代码</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">super</span><span class="token punctuation">(</span>message<span class="token punctuation">)</span>
    213. 

  213. </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>这个是 <code>super</code> 继承对测试覆盖率支持的坑，目前没有好的解决方案，可以先忽略。</p> <h2 id="headers-模块测试"><a href="#headers-模块测试" class="header-anchor">#</a> headers 模块测试</h2> <p><code>test/helpers/headers.spec.ts</code>：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">import</span> <span class="token punctuation">{</span> parseHeaders<span class="token punctuation">,</span> processHeaders<span class="token punctuation">,</span> flattenHeaders <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'../../src/helpers/headers'</span>
    214. 

  214. 

  215. <span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'helpers:header'</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>
    216. 

  216.   <span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'parseHeaders'</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>
    217. 

  217.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should parse headers'</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>
    218. 

  218.       <span class="token keyword">const</span> parsed <span class="token operator">=</span> <span class="token function">parseHeaders</span><span class="token punctuation">(</span>
    219. 

  219.         <span class="token string">'Content-Type: application/json\r\n'</span> <span class="token operator">+</span>
    220. 

  220.           <span class="token string">'Connection: keep-alive\r\n'</span> <span class="token operator">+</span>
    221. 

  221.           <span class="token string">'Transfer-Encoding: chunked\r\n'</span> <span class="token operator">+</span>
    222. 

  222.           <span class="token string">'Date: Tue, 21 May 2019 09:23:44 GMT\r\n'</span> <span class="token operator">+</span>
    223. 

  223.           <span class="token string">':aa\r\n'</span> <span class="token operator">+</span>
    224. 

  224.           <span class="token string">'key:'</span>
    225. 

  225.       <span class="token punctuation">)</span>
    226. 

  226. 

  227.       <span class="token function">expect</span><span class="token punctuation">(</span>parsed<span class="token punctuation">[</span><span class="token string">'content-type'</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'application/json'</span><span class="token punctuation">)</span>
    228. 

  228.       <span class="token function">expect</span><span class="token punctuation">(</span>parsed<span class="token punctuation">[</span><span class="token string">'connection'</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'keep-alive'</span><span class="token punctuation">)</span>
    229. 

  229.       <span class="token function">expect</span><span class="token punctuation">(</span>parsed<span class="token punctuation">[</span><span class="token string">'transfer-encoding'</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'chunked'</span><span class="token punctuation">)</span>
    230. 

  230.       <span class="token function">expect</span><span class="token punctuation">(</span>parsed<span class="token punctuation">[</span><span class="token string">'date'</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'Tue, 21 May 2019 09:23:44 GMT'</span><span class="token punctuation">)</span>
    231. 

  231.       <span class="token function">expect</span><span class="token punctuation">(</span>parsed<span class="token punctuation">[</span><span class="token string">'key'</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">''</span><span class="token punctuation">)</span>
    232. 

  232.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    233. 

  233. 

  234.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should return empty object if headers is empty string'</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>
    235. 

  235.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">parseHeaders</span><span class="token punctuation">(</span><span class="token string">''</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><span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    236. 

  236.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    237. 

  237.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    238. 

  238. 

  239.   <span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'processHeaders'</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>
    240. 

  240.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should normalize Content-Type header name'</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>
    241. 

  241.       <span class="token keyword">const</span> headers<span class="token operator">:</span> <span class="token builtin">any</span> <span class="token operator">=</span> <span class="token punctuation">{</span>
    242. 

  242.         <span class="token string-property property">'conTenT-Type'</span><span class="token operator">:</span> <span class="token string">'foo/bar'</span><span class="token punctuation">,</span>
    243. 

  243.         <span class="token string-property property">'Content-length'</span><span class="token operator">:</span> <span class="token number">1024</span>
    244. 

  244.       <span class="token punctuation">}</span>
    245. 

  245.       <span class="token function">processHeaders</span><span class="token punctuation">(</span>headers<span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    246. 

  246.       <span class="token function">expect</span><span class="token punctuation">(</span>headers<span class="token punctuation">[</span><span class="token string">'Content-Type'</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'foo/bar'</span><span class="token punctuation">)</span>
    247. 

  247.       <span class="token function">expect</span><span class="token punctuation">(</span>headers<span class="token punctuation">[</span><span class="token string">'conTenT-Type'</span><span class="token punctuation">]</span><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>
    248. 

  248.       <span class="token function">expect</span><span class="token punctuation">(</span>headers<span class="token punctuation">[</span><span class="token string">'Content-length'</span><span class="token punctuation">]</span><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">1024</span><span class="token punctuation">)</span>
    249. 

  249.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    250. 

  250. 

  251.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should set Content-Type if not set and data is PlainObject'</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>
    252. 

  252.       <span class="token keyword">const</span> headers<span class="token operator">:</span> <span class="token builtin">any</span> <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token punctuation">}</span>
    253. 

  253.       <span class="token function">processHeaders</span><span class="token punctuation">(</span>headers<span class="token punctuation">,</span> <span class="token punctuation">{</span> a<span class="token operator">:</span> <span class="token number">1</span> <span class="token punctuation">}</span><span class="token punctuation">)</span>
    254. 

  254.       <span class="token function">expect</span><span class="token punctuation">(</span>headers<span class="token punctuation">[</span><span class="token string">'Content-Type'</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'application/json;charset=utf-8'</span><span class="token punctuation">)</span>
    255. 

  255.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    256. 

  256. 

  257.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should set not Content-Type if not set and data is not PlainObject'</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>
    258. 

  258.       <span class="token keyword">const</span> headers<span class="token operator">:</span> <span class="token builtin">any</span> <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token punctuation">}</span>
    259. 

  259.       <span class="token function">processHeaders</span><span class="token punctuation">(</span>headers<span class="token punctuation">,</span> <span class="token keyword">new</span> <span class="token class-name">URLSearchParams</span><span class="token punctuation">(</span><span class="token string">'a=b'</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
    260. 

  260.       <span class="token function">expect</span><span class="token punctuation">(</span>headers<span class="token punctuation">[</span><span class="token string">'Content-Type'</span><span class="token punctuation">]</span><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>
    261. 

  261.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    262. 

  262. 

  263.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should do nothing if headers is undefined or null'</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>
    264. 

  264.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">processHeaders</span><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 punctuation">)</span><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>
    265. 

  265.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">processHeaders</span><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><span class="token function">toBeNull</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    266. 

  266.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    267. 

  267.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    268. 

  268. 

  269.   <span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'flattenHeaders'</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>
    270. 

  270.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should flatten the headers and include common headers'</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>
    271. 

  271.       <span class="token keyword">const</span> headers <span class="token operator">=</span> <span class="token punctuation">{</span>
    272. 

  272.         Accept<span class="token operator">:</span> <span class="token string">'application/json'</span><span class="token punctuation">,</span>
    273. 

  273.         common<span class="token operator">:</span> <span class="token punctuation">{</span>
    274. 

  274.           <span class="token string-property property">'X-COMMON-HEADER'</span><span class="token operator">:</span> <span class="token string">'commonHeaderValue'</span>
    275. 

  275.         <span class="token punctuation">}</span><span class="token punctuation">,</span>
    276. 

  276.         get<span class="token operator">:</span> <span class="token punctuation">{</span>
    277. 

  277.           <span class="token string-property property">'X-GET-HEADER'</span><span class="token operator">:</span> <span class="token string">'getHeaderValue'</span>
    278. 

  278.         <span class="token punctuation">}</span><span class="token punctuation">,</span>
    279. 

  279.         post<span class="token operator">:</span> <span class="token punctuation">{</span>
    280. 

  280.           <span class="token string-property property">'X-POST-HEADER'</span><span class="token operator">:</span> <span class="token string">'postHeaderValue'</span>
    281. 

  281.         <span class="token punctuation">}</span>
    282. 

  282.       <span class="token punctuation">}</span>
    283. 

  283. 

  284.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">flattenHeaders</span><span class="token punctuation">(</span>headers<span class="token punctuation">,</span> <span class="token string">'get'</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><span class="token punctuation">{</span>
    285. 

  285.         Accept<span class="token operator">:</span> <span class="token string">'application/json'</span><span class="token punctuation">,</span>
    286. 

  286.         <span class="token string-property property">'X-COMMON-HEADER'</span><span class="token operator">:</span> <span class="token string">'commonHeaderValue'</span><span class="token punctuation">,</span>
    287. 

  287.         <span class="token string-property property">'X-GET-HEADER'</span><span class="token operator">:</span> <span class="token string">'getHeaderValue'</span>
    288. 

  288.       <span class="token punctuation">}</span><span class="token punctuation">)</span>
    289. 

  289.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    290. 

  290. 

  291.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should flatten the headers without common headers'</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>
    292. 

  292.       <span class="token keyword">const</span> headers <span class="token operator">=</span> <span class="token punctuation">{</span>
    293. 

  293.         Accept<span class="token operator">:</span> <span class="token string">'application/json'</span><span class="token punctuation">,</span>
    294. 

  294.         get<span class="token operator">:</span> <span class="token punctuation">{</span>
    295. 

  295.           <span class="token string-property property">'X-GET-HEADER'</span><span class="token operator">:</span> <span class="token string">'getHeaderValue'</span>
    296. 

  296.         <span class="token punctuation">}</span>
    297. 

  297.       <span class="token punctuation">}</span>
    298. 

  298. 

  299.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">flattenHeaders</span><span class="token punctuation">(</span>headers<span class="token punctuation">,</span> <span class="token string">'patch'</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><span class="token punctuation">{</span>
    300. 

  300.         Accept<span class="token operator">:</span> <span class="token string">'application/json'</span>
    301. 

  301.       <span class="token punctuation">}</span><span class="token punctuation">)</span>
    302. 

  302.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    303. 

  303. 

  304.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should do nothing if headers is undefined or null'</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>
    305. 

  305.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">flattenHeaders</span><span class="token punctuation">(</span><span class="token keyword">undefined</span><span class="token punctuation">,</span> <span class="token string">'get'</span><span class="token punctuation">)</span><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>
    306. 

  306.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">flattenHeaders</span><span class="token punctuation">(</span><span class="token keyword">null</span><span class="token punctuation">,</span> <span class="token string">'post'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeNull</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    307. 

  307.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    308. 

  308.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    309. 

  309. <span class="token punctuation">}</span><span class="token punctuation">)</span>
    310. 

  310. </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></div></div><p>运行后，我们会发现 <code>parseHeaders</code> 测试组的 <code>should parse headers</code> 测试没通过，<code>expect(parsed['date']).toBe('Tue, 21 May 2019 09:23:44 GMT')</code> 我们期望解析后的 <code>date</code> 字段是 <code>Tue, 21 May 2019 09:23:44 GMT</code>，而实际的值是 <code>Tue, 21 May 2019 09</code>。</p> <p>测试没通过，我们检查一下代码，发现我们 <code>parseHeaders</code> 的代码逻辑漏洞，我们只考虑了第一个 &quot;:&quot; 号，没考虑后半部分的字符串内部也可能有 &quot;:&quot;，按我们现有的逻辑就会把字符串中 &quot;:&quot; 后面部分都截断了。</p> <p>因此我们修改 <code>parseHeaders</code> 的实现逻辑。</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">export</span> <span class="token keyword">function</span> <span class="token function">parseHeaders</span><span class="token punctuation">(</span>headers<span class="token operator">:</span> <span class="token builtin">string</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token builtin">any</span> <span class="token punctuation">{</span>
    311. 

  311.   <span class="token keyword">let</span> parsed <span class="token operator">=</span> Object<span class="token punctuation">.</span><span class="token function">create</span><span class="token punctuation">(</span><span class="token keyword">null</span><span class="token punctuation">)</span>
    312. 

  312.   <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>headers<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    313. 

  313.     <span class="token keyword">return</span> parsed
    314. 

  314.   <span class="token punctuation">}</span>
    315. 

  315. 

  316.   headers<span class="token punctuation">.</span><span class="token function">split</span><span class="token punctuation">(</span><span class="token string">'\r\n'</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span>line <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    317. 

  317.     <span class="token keyword">let</span> <span class="token punctuation">[</span>key<span class="token punctuation">,</span> <span class="token operator">...</span>vals<span class="token punctuation">]</span> <span class="token operator">=</span> line<span class="token punctuation">.</span><span class="token function">split</span><span class="token punctuation">(</span><span class="token string">':'</span><span class="token punctuation">)</span>
    318. 

  318.     key <span class="token operator">=</span> key<span class="token punctuation">.</span><span class="token function">trim</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toLowerCase</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    319. 

  319.     <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>key<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    320. 

  320.       <span class="token keyword">return</span>
    321. 

  321.     <span class="token punctuation">}</span>
    322. 

  322.     <span class="token keyword">let</span> val <span class="token operator">=</span> vals<span class="token punctuation">.</span><span class="token function">join</span><span class="token punctuation">(</span><span class="token string">':'</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">trim</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    323. 

  323.     parsed<span class="token punctuation">[</span>key<span class="token punctuation">]</span> <span class="token operator">=</span> val
    324. 

  324.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    325. 

  325. 

  326.   <span class="token keyword">return</span> parsed
    327. 

  327. <span class="token punctuation">}</span>
    328. 

  328. </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></div></div><p>这样我们再重新跑测试，就会通过了。</p> <h2 id="url-模块测试"><a href="#url-模块测试" class="header-anchor">#</a> url 模块测试</h2> <p><code>test/helpers/url.spec.ts</code>：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">import</span> <span class="token punctuation">{</span> buildURL<span class="token punctuation">,</span> isAbsoluteURL<span class="token punctuation">,</span> combineURL<span class="token punctuation">,</span> isURLSameOrigin <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'../../src/helpers/url'</span>
    329. 

  329. 

  330. <span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'helpers:url'</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>
    331. 

  331.   <span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'buildURL'</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>
    332. 

  332.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should support null params'</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>
    333. 

  333.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">buildURL</span><span class="token punctuation">(</span><span class="token string">'/foo'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'/foo'</span><span class="token punctuation">)</span>
    334. 

  334.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    335. 

  335. 

  336.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should support params'</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>
    337. 

  337.       <span class="token function">expect</span><span class="token punctuation">(</span>
    338. 

  338.         <span class="token function">buildURL</span><span class="token punctuation">(</span><span class="token string">'/foo'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
    339. 

  339.           foo<span class="token operator">:</span> <span class="token string">'bar'</span>
    340. 

  340.         <span class="token punctuation">}</span><span class="token punctuation">)</span>
    341. 

  341.       <span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'/foo?foo=bar'</span><span class="token punctuation">)</span>
    342. 

  342.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    343. 

  343. 

  344.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should ignore if some param value is null'</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>
    345. 

  345.       <span class="token function">expect</span><span class="token punctuation">(</span>
    346. 

  346.         <span class="token function">buildURL</span><span class="token punctuation">(</span><span class="token string">'/foo'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
    347. 

  347.           foo<span class="token operator">:</span> <span class="token string">'bar'</span><span class="token punctuation">,</span>
    348. 

  348.           baz<span class="token operator">:</span> <span class="token keyword">null</span>
    349. 

  349.         <span class="token punctuation">}</span><span class="token punctuation">)</span>
    350. 

  350.       <span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'/foo?foo=bar'</span><span class="token punctuation">)</span>
    351. 

  351.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    352. 

  352. 

  353.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should ignore if the only param value is null'</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>
    354. 

  354.       <span class="token function">expect</span><span class="token punctuation">(</span>
    355. 

  355.         <span class="token function">buildURL</span><span class="token punctuation">(</span><span class="token string">'/foo'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
    356. 

  356.           baz<span class="token operator">:</span> <span class="token keyword">null</span>
    357. 

  357.         <span class="token punctuation">}</span><span class="token punctuation">)</span>
    358. 

  358.       <span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'/foo'</span><span class="token punctuation">)</span>
    359. 

  359.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    360. 

  360. 

  361.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should support object params'</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>
    362. 

  362.       <span class="token function">expect</span><span class="token punctuation">(</span>
    363. 

  363.         <span class="token function">buildURL</span><span class="token punctuation">(</span><span class="token string">'/foo'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
    364. 

  364.           foo<span class="token operator">:</span> <span class="token punctuation">{</span>
    365. 

  365.             bar<span class="token operator">:</span> <span class="token string">'baz'</span>
    366. 

  366.           <span class="token punctuation">}</span>
    367. 

  367.         <span class="token punctuation">}</span><span class="token punctuation">)</span>
    368. 

  368.       <span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'/foo?foo='</span> <span class="token operator">+</span> <span class="token function">encodeURI</span><span class="token punctuation">(</span><span class="token string">'{&quot;bar&quot;:&quot;baz&quot;}'</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
    369. 

  369.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    370. 

  370. 

  371.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should support date params'</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>
    372. 

  372.       <span class="token keyword">const</span> date <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Date</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    373. 

  373. 

  374.       <span class="token function">expect</span><span class="token punctuation">(</span>
    375. 

  375.         <span class="token function">buildURL</span><span class="token punctuation">(</span><span class="token string">'/foo'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
    376. 

  376.           date<span class="token operator">:</span> date
    377. 

  377.         <span class="token punctuation">}</span><span class="token punctuation">)</span>
    378. 

  378.       <span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'/foo?date='</span> <span class="token operator">+</span> date<span class="token punctuation">.</span><span class="token function">toISOString</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
    379. 

  379.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    380. 

  380. 

  381.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should support array params'</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>
    382. 

  382.       <span class="token function">expect</span><span class="token punctuation">(</span>
    383. 

  383.         <span class="token function">buildURL</span><span class="token punctuation">(</span><span class="token string">'/foo'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
    384. 

  384.           foo<span class="token operator">:</span> <span class="token punctuation">[</span><span class="token string">'bar'</span><span class="token punctuation">,</span> <span class="token string">'baz'</span><span class="token punctuation">]</span>
    385. 

  385.         <span class="token punctuation">}</span><span class="token punctuation">)</span>
    386. 

  386.       <span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'/foo?foo[]=bar&amp;foo[]=baz'</span><span class="token punctuation">)</span>
    387. 

  387.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    388. 

  388. 

  389.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should support special char params'</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>
    390. 

  390.       <span class="token function">expect</span><span class="token punctuation">(</span>
    391. 

  391.         <span class="token function">buildURL</span><span class="token punctuation">(</span><span class="token string">'/foo'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
    392. 

  392.           foo<span class="token operator">:</span> <span class="token string">'@:$, '</span>
    393. 

  393.         <span class="token punctuation">}</span><span class="token punctuation">)</span>
    394. 

  394.       <span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'/foo?foo=@:$,+'</span><span class="token punctuation">)</span>
    395. 

  395.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    396. 

  396. 

  397.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should support existing params'</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>
    398. 

  398.       <span class="token function">expect</span><span class="token punctuation">(</span>
    399. 

  399.         <span class="token function">buildURL</span><span class="token punctuation">(</span><span class="token string">'/foo?foo=bar'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
    400. 

  400.           bar<span class="token operator">:</span> <span class="token string">'baz'</span>
    401. 

  401.         <span class="token punctuation">}</span><span class="token punctuation">)</span>
    402. 

  402.       <span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'/foo?foo=bar&amp;bar=baz'</span><span class="token punctuation">)</span>
    403. 

  403.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    404. 

  404. 

  405.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should correct discard url hash mark'</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>
    406. 

  406.       <span class="token function">expect</span><span class="token punctuation">(</span>
    407. 

  407.         <span class="token function">buildURL</span><span class="token punctuation">(</span><span class="token string">'/foo?foo=bar#hash'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
    408. 

  408.           query<span class="token operator">:</span> <span class="token string">'baz'</span>
    409. 

  409.         <span class="token punctuation">}</span><span class="token punctuation">)</span>
    410. 

  410.       <span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'/foo?foo=bar&amp;query=baz'</span><span class="token punctuation">)</span>
    411. 

  411.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    412. 

  412. 

  413.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should use serializer if provided'</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>
    414. 

  414.       <span class="token keyword">const</span> serializer <span class="token operator">=</span> jest<span class="token punctuation">.</span><span class="token function">fn</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>
    415. 

  415.         <span class="token keyword">return</span> <span class="token string">'foo=bar'</span>
    416. 

  416.       <span class="token punctuation">}</span><span class="token punctuation">)</span>
    417. 

  417.       <span class="token keyword">const</span> params <span class="token operator">=</span> <span class="token punctuation">{</span> foo<span class="token operator">:</span> <span class="token string">'bar'</span> <span class="token punctuation">}</span>
    418. 

  418.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">buildURL</span><span class="token punctuation">(</span><span class="token string">'/foo'</span><span class="token punctuation">,</span> params<span class="token punctuation">,</span> serializer<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'/foo?foo=bar'</span><span class="token punctuation">)</span>
    419. 

  419.       <span class="token function">expect</span><span class="token punctuation">(</span>serializer<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toHaveBeenCalled</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    420. 

  420.       <span class="token function">expect</span><span class="token punctuation">(</span>serializer<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toHaveBeenCalledWith</span><span class="token punctuation">(</span>params<span class="token punctuation">)</span>
    421. 

  421.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    422. 

  422. 

  423.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should support URLSearchParams'</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>
    424. 

  424.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">buildURL</span><span class="token punctuation">(</span><span class="token string">'/foo'</span><span class="token punctuation">,</span> <span class="token keyword">new</span> <span class="token class-name">URLSearchParams</span><span class="token punctuation">(</span><span class="token string">'bar=baz'</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">toBe</span><span class="token punctuation">(</span><span class="token string">'/foo?bar=baz'</span><span class="token punctuation">)</span>
    425. 

  425.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    426. 

  426.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    427. 

  427. 

  428.   <span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'isAbsoluteURL'</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>
    429. 

  429.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should return true if URL begins with valid scheme name'</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>
    430. 

  430.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">isAbsoluteURL</span><span class="token punctuation">(</span><span class="token string">'https://api.github.com/users'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeTruthy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    431. 

  431.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">isAbsoluteURL</span><span class="token punctuation">(</span><span class="token string">'custom-scheme-v1.0://example.com/'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeTruthy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    432. 

  432.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">isAbsoluteURL</span><span class="token punctuation">(</span><span class="token string">'HTTP://example.com/'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeTruthy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    433. 

  433.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    434. 

  434. 

  435.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should return false if URL begins with invalid scheme name'</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>
    436. 

  436.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">isAbsoluteURL</span><span class="token punctuation">(</span><span class="token string">'123://example.com/'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeFalsy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    437. 

  437.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">isAbsoluteURL</span><span class="token punctuation">(</span><span class="token string">'!valid://example.com/'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeFalsy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    438. 

  438.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    439. 

  439. 

  440.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should return true if URL is protocol-relative'</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>
    441. 

  441.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">isAbsoluteURL</span><span class="token punctuation">(</span><span class="token string">'//example.com/'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeTruthy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    442. 

  442.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    443. 

  443. 

  444.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should return false if URL is relative'</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>
    445. 

  445.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">isAbsoluteURL</span><span class="token punctuation">(</span><span class="token string">'/foo'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeFalsy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    446. 

  446.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">isAbsoluteURL</span><span class="token punctuation">(</span><span class="token string">'foo'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeFalsy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    447. 

  447.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    448. 

  448.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    449. 

  449. 

  450.   <span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'combineURL'</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>
    451. 

  451.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should combine URL'</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>
    452. 

  452.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">combineURL</span><span class="token punctuation">(</span><span class="token string">'https://api.github.com'</span><span class="token punctuation">,</span> <span class="token string">'/users'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'https://api.github.com/users'</span><span class="token punctuation">)</span>
    453. 

  453.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    454. 

  454. 

  455.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should remove duplicate slashes'</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>
    456. 

  456.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">combineURL</span><span class="token punctuation">(</span><span class="token string">'https://api.github.com/'</span><span class="token punctuation">,</span> <span class="token string">'/users'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'https://api.github.com/users'</span><span class="token punctuation">)</span>
    457. 

  457.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    458. 

  458. 

  459.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should insert missing slash'</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>
    460. 

  460.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">combineURL</span><span class="token punctuation">(</span><span class="token string">'https://api.github.com'</span><span class="token punctuation">,</span> <span class="token string">'users'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'https://api.github.com/users'</span><span class="token punctuation">)</span>
    461. 

  461.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    462. 

  462. 

  463.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should not insert slash when relative url missing/empty'</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>
    464. 

  464.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">combineURL</span><span class="token punctuation">(</span><span class="token string">'https://api.github.com/users'</span><span class="token punctuation">,</span> <span class="token string">''</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'https://api.github.com/users'</span><span class="token punctuation">)</span>
    465. 

  465.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    466. 

  466. 

  467.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should allow a single slash for relative url'</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>
    468. 

  468.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">combineURL</span><span class="token punctuation">(</span><span class="token string">'https://api.github.com/users'</span><span class="token punctuation">,</span> <span class="token string">'/'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'https://api.github.com/users/'</span><span class="token punctuation">)</span>
    469. 

  469.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    470. 

  470.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    471. 

  471. 

  472.   <span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'isURLSameOrigin'</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>
    473. 

  473.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should detect same origin'</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>
    474. 

  474.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">isURLSameOrigin</span><span class="token punctuation">(</span>window<span class="token punctuation">.</span>location<span class="token punctuation">.</span>href<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeTruthy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    475. 

  475.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    476. 

  476. 

  477.     <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should detect different origin'</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>
    478. 

  478.       <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">isURLSameOrigin</span><span class="token punctuation">(</span><span class="token string">'https://github.com/axios/axios'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeFalsy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    479. 

  479.     <span class="token punctuation">}</span><span class="token punctuation">)</span>
    480. 

  480.   <span class="token punctuation">}</span><span class="token punctuation">)</span>
    481. 

  481. <span class="token punctuation">}</span><span class="token punctuation">)</span>
    482. 

  482. </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 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class="line-number">150</span><br><span class="line-number">151</span><br><span class="line-number">152</span><br><span class="line-number">153</span><br><span class="line-number">154</span><br></div></div><p>这里要注意的是，我们使用了 <a href="https://jestjs.io/docs/en/jest-object#jestfnimplementation" target="_blank" rel="noopener noreferrer"><code>jest.fn</code><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> 去模拟了一个函数，这个也是在编写 Jest 测试中非常常用的一个 API。</p> <p>至此，我们就实现了 <code>ts-axios</code> 库 <code>helpers</code> 目录下所有模块的测试，并把该目录下的测试覆盖率达到了近乎 100% 的覆盖率。下面的章节我们就开始测试 <code>ts-axios</code> 的核心流程，针对不同的 <code>feature</code> 去编写单元测试了。</p></div></div>  <div class="page-edit"><div class="edit-link"><a href="https://github.com/heBody/blog/edit/master/docs/《TypeScript 从零实现 axios》/11.ts-axios 单元测试/03.辅助模块单元测试.md" target="_blank" rel="noopener noreferrer">编辑</a> <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></div> <div class="tags"><a href="/blog/tags/?tag=TypeScript" title="标签">#TypeScript</a></div> <div class="last-updated"><span 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