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<article class="md-content__inner md-typeset">
<h1 id="testing-react">Testing React</h1>
<h2 id="jest"><a href="https://jestjs.io/">Jest</a></h2>
<h3 id="jest-configuration">Jest Configuration</h3>
<div class="highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">JavaScript</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-0-1">1</a></span>
<span class="normal"><a href="#__codelineno-0-2">2</a></span>
<span class="normal"><a href="#__codelineno-0-3">3</a></span>
<span class="normal"><a href="#__codelineno-0-4">4</a></span>
<span class="normal"><a href="#__codelineno-0-5">5</a></span>
<span class="normal"><a href="#__codelineno-0-6">6</a></span>
<span class="normal"><a href="#__codelineno-0-7">7</a></span></pre></div></td><td class="code"><div><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1"></a><span class="c1">// jest.config.js</span>
<a id="__codelineno-0-2" name="__codelineno-0-2"></a><span class="nx">module</span><span class="p">.</span><span class="nx">exports</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-0-3" name="__codelineno-0-3"></a><span class="w"> </span><span class="nx">testEnvironment</span><span class="o">:</span><span class="w"> </span><span class="s1">'jsdom'</span><span class="p">,</span>
<a id="__codelineno-0-4" name="__codelineno-0-4"></a><span class="w"> </span><span class="nx">moduleFileExtensions</span><span class="o">:</span><span class="w"> </span><span class="p">[</span><span class="s1">'js'</span><span class="p">,</span><span class="w"> </span><span class="s1">'jsx'</span><span class="p">,</span><span class="w"> </span><span class="s1">'ts'</span><span class="p">,</span><span class="w"> </span><span class="s1">'tsx'</span><span class="p">,</span><span class="w"> </span><span class="s1">'json'</span><span class="p">,</span><span class="w"> </span><span class="s1">'node'</span><span class="p">],</span>
<a id="__codelineno-0-5" name="__codelineno-0-5"></a><span class="w"> </span><span class="nx">setupFilesAfterEnv</span><span class="o">:</span><span class="w"> </span><span class="p">[</span><span class="s1">'@testing-library/jest-dom/extend-expect'</span><span class="p">],</span><span class="w"> </span><span class="c1">// add testing-library methods to expect()</span>
<a id="__codelineno-0-6" name="__codelineno-0-6"></a><span class="w"> </span><span class="nx">transform</span><span class="o">:</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="s1">'^.+\\.tsx?$'</span><span class="o">:</span><span class="w"> </span><span class="s1">'ts-jest'</span><span class="p">}</span><span class="w"> </span><span class="c1">// use ts-jest fo ts files</span>
<a id="__codelineno-0-7" name="__codelineno-0-7"></a><span class="p">}</span>
</code></pre></div></td></tr></table></div>
<h3 id="jest-tests">Jest Tests</h3>
<p><a href="https://jestjs.io/docs/expect">Expect docs</a></p>
<div class="highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">JavaScript</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-1-1"> 1</a></span>
<span class="normal"><a href="#__codelineno-1-2"> 2</a></span>
<span class="normal"><a href="#__codelineno-1-3"> 3</a></span>
<span class="normal"><a href="#__codelineno-1-4"> 4</a></span>
<span class="normal"><a href="#__codelineno-1-5"> 5</a></span>
<span class="normal"><a href="#__codelineno-1-6"> 6</a></span>
<span class="normal"><a href="#__codelineno-1-7"> 7</a></span>
<span class="normal"><a href="#__codelineno-1-8"> 8</a></span>
<span class="normal"><a href="#__codelineno-1-9"> 9</a></span>
<span class="normal"><a href="#__codelineno-1-10">10</a></span>
<span class="normal"><a href="#__codelineno-1-11">11</a></span></pre></div></td><td class="code"><div><pre><span></span><code><a id="__codelineno-1-1" name="__codelineno-1-1"></a><span class="c1">// .spec.js or .test.js</span>
<a id="__codelineno-1-2" name="__codelineno-1-2"></a><span class="nx">it</span><span class="p">(</span><span class="s2">"test description"</span><span class="p">,</span><span class="w"> </span><span class="p">()</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-1-3" name="__codelineno-1-3"></a><span class="w"> </span><span class="c1">// test body</span>
<a id="__codelineno-1-4" name="__codelineno-1-4"></a><span class="w"> </span><span class="nx">expect</span><span class="p">(</span><span class="nx">expected</span><span class="p">).</span><span class="nx">toEqual</span><span class="p">(</span><span class="nx">actual</span><span class="p">);</span>
<a id="__codelineno-1-5" name="__codelineno-1-5"></a><span class="p">});</span>
<a id="__codelineno-1-6" name="__codelineno-1-6"></a>
<a id="__codelineno-1-7" name="__codelineno-1-7"></a><span class="c1">// group related tests</span>
<a id="__codelineno-1-8" name="__codelineno-1-8"></a><span class="nx">describe</span><span class="p">(</span><span class="s2">"test group name"</span><span class="p">,</span><span class="w"> </span><span class="p">()</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-1-9" name="__codelineno-1-9"></a><span class="w"> </span><span class="nx">it</span><span class="p">(</span><span class="cm">/* ... */</span><span class="p">);</span>
<a id="__codelineno-1-10" name="__codelineno-1-10"></a><span class="w"> </span><span class="nx">it</span><span class="p">(</span><span class="cm">/* ... */</span><span class="p">);</span>
<a id="__codelineno-1-11" name="__codelineno-1-11"></a><span class="p">});</span>
</code></pre></div></td></tr></table></div>
<h3 id="snapshots">Snapshots</h3>
<p>In <code>Component.Snapshots.js</code>:</p>
<div class="highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">JavaScript</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-2-1"> 1</a></span>
<span class="normal"><a href="#__codelineno-2-2"> 2</a></span>
<span class="normal"><a href="#__codelineno-2-3"> 3</a></span>
<span class="normal"><a href="#__codelineno-2-4"> 4</a></span>
<span class="normal"><a href="#__codelineno-2-5"> 5</a></span>
<span class="normal"><a href="#__codelineno-2-6"> 6</a></span>
<span class="normal"><a href="#__codelineno-2-7"> 7</a></span>
<span class="normal"><a href="#__codelineno-2-8"> 8</a></span>
<span class="normal"><a href="#__codelineno-2-9"> 9</a></span>
<span class="normal"><a href="#__codelineno-2-10">10</a></span>
<span class="normal"><a href="#__codelineno-2-11">11</a></span>
<span class="normal"><a href="#__codelineno-2-12">12</a></span>
<span class="normal"><a href="#__codelineno-2-13">13</a></span>
<span class="normal"><a href="#__codelineno-2-14">14</a></span>
<span class="normal"><a href="#__codelineno-2-15">15</a></span></pre></div></td><td class="code"><div><pre><span></span><code><a id="__codelineno-2-1" name="__codelineno-2-1"></a><span class="k">import</span><span class="w"> </span><span class="nx">React</span><span class="w"> </span><span class="kr">from</span><span class="w"> </span><span class="s2">"react"</span><span class="p">;</span>
<a id="__codelineno-2-2" name="__codelineno-2-2"></a><span class="k">import</span><span class="w"> </span><span class="nx">renderer</span><span class="w"> </span><span class="kr">from</span><span class="w"> </span><span class="s2">"react-test-renderer"</span><span class="p">;</span>
<a id="__codelineno-2-3" name="__codelineno-2-3"></a>
<a id="__codelineno-2-4" name="__codelineno-2-4"></a><span class="k">import</span><span class="w"> </span><span class="nx">Component</span><span class="w"> </span><span class="kr">from</span><span class="w"> </span><span class="s2">"./path/to/Component"</span><span class="p">;</span>
<a id="__codelineno-2-5" name="__codelineno-2-5"></a><span class="c1">// import mock data if necessary</span>
<a id="__codelineno-2-6" name="__codelineno-2-6"></a>
<a id="__codelineno-2-7" name="__codelineno-2-7"></a><span class="nx">it</span><span class="p">(</span><span class="s2">"test description"</span><span class="p">,</span><span class="w"> </span><span class="p">()</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-2-8" name="__codelineno-2-8"></a><span class="w"> </span><span class="c1">// renders the DOM tree of the component</span>
<a id="__codelineno-2-9" name="__codelineno-2-9"></a><span class="w"> </span><span class="kd">const</span><span class="w"> </span><span class="nx">tree</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nx">renderer</span><span class="p">.</span><span class="nx">create</span><span class="p">(</span><span class="o"><</span><span class="nx">Component</span><span class="w"> </span><span class="nx">funcProp</span><span class="o">=</span><span class="p">{</span><span class="nx">jest</span><span class="p">.</span><span class="nx">fn</span><span class="p">()</span><span class="w"> </span><span class="cm">/* mock function */</span><span class="p">}</span><span class="w"> </span><span class="cm">/* component props */</span><span class="w"> </span><span class="o">/></span><span class="p">);</span>
<a id="__codelineno-2-10" name="__codelineno-2-10"></a>
<a id="__codelineno-2-11" name="__codelineno-2-11"></a><span class="w"> </span><span class="c1">// save a snapshot of the component at this point in time ( in __snapshots__ folder)</span>
<a id="__codelineno-2-12" name="__codelineno-2-12"></a><span class="w"> </span><span class="c1">// in future test it will be checked to avoid regressions</span>
<a id="__codelineno-2-13" name="__codelineno-2-13"></a><span class="w"> </span><span class="c1">// can be updated during jest --watch pressing "u"</span>
<a id="__codelineno-2-14" name="__codelineno-2-14"></a><span class="w"> </span><span class="nx">expect</span><span class="p">(</span><span class="nx">tree</span><span class="p">).</span><span class="nx">matchSnapshot</span><span class="p">();</span>
<a id="__codelineno-2-15" name="__codelineno-2-15"></a><span class="p">});</span>
</code></pre></div></td></tr></table></div>
<hr />
<h2 id="enzyme"><a href="https://enzymejs.github.io/enzyme/">Enzyme</a></h2>
<h3 id="enzyme-configuration">Enzyme Configuration</h3>
<div class="highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">JavaScript</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-3-1">1</a></span>
<span class="normal"><a href="#__codelineno-3-2">2</a></span>
<span class="normal"><a href="#__codelineno-3-3">3</a></span>
<span class="normal"><a href="#__codelineno-3-4">4</a></span>
<span class="normal"><a href="#__codelineno-3-5">5</a></span></pre></div></td><td class="code"><div><pre><span></span><code><a id="__codelineno-3-1" name="__codelineno-3-1"></a><span class="c1">// testSetup.js</span>
<a id="__codelineno-3-2" name="__codelineno-3-2"></a><span class="k">import</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="nx">configure</span><span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="kr">from</span><span class="w"> </span><span class="s2">"enzyme"</span><span class="p">;</span>
<a id="__codelineno-3-3" name="__codelineno-3-3"></a><span class="k">import</span><span class="w"> </span><span class="nx">Adapter</span><span class="w"> </span><span class="kr">from</span><span class="w"> </span><span class="s2">"enzyme-adapter-react-<version>"</span><span class="p">;</span>
<a id="__codelineno-3-4" name="__codelineno-3-4"></a>
<a id="__codelineno-3-5" name="__codelineno-3-5"></a><span class="nx">configure</span><span class="p">({</span><span class="w"> </span><span class="nx">adapter</span><span class="o">:</span><span class="w"> </span><span class="ow">new</span><span class="w"> </span><span class="nx">Adapter</span><span class="p">()</span><span class="w"> </span><span class="p">});</span>
</code></pre></div></td></tr></table></div>
<h3 id="enzyme-tests">Enzyme Tests</h3>
<p>In <code>Component.test.js</code>:</p>
<div class="highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">JavaScript</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-4-1"> 1</a></span>
<span class="normal"><a href="#__codelineno-4-2"> 2</a></span>
<span class="normal"><a href="#__codelineno-4-3"> 3</a></span>
<span class="normal"><a href="#__codelineno-4-4"> 4</a></span>
<span class="normal"><a href="#__codelineno-4-5"> 5</a></span>
<span class="normal"><a href="#__codelineno-4-6"> 6</a></span>
<span class="normal"><a href="#__codelineno-4-7"> 7</a></span>
<span class="normal"><a href="#__codelineno-4-8"> 8</a></span>
<span class="normal"><a href="#__codelineno-4-9"> 9</a></span>
<span class="normal"><a href="#__codelineno-4-10">10</a></span>
<span class="normal"><a href="#__codelineno-4-11">11</a></span>
<span class="normal"><a href="#__codelineno-4-12">12</a></span>
<span class="normal"><a href="#__codelineno-4-13">13</a></span>
<span class="normal"><a href="#__codelineno-4-14">14</a></span>
<span class="normal"><a href="#__codelineno-4-15">15</a></span>
<span class="normal"><a href="#__codelineno-4-16">16</a></span>
<span class="normal"><a href="#__codelineno-4-17">17</a></span>
<span class="normal"><a href="#__codelineno-4-18">18</a></span>
<span class="normal"><a href="#__codelineno-4-19">19</a></span>
<span class="normal"><a href="#__codelineno-4-20">20</a></span>
<span class="normal"><a href="#__codelineno-4-21">21</a></span>
<span class="normal"><a href="#__codelineno-4-22">22</a></span>
<span class="normal"><a href="#__codelineno-4-23">23</a></span>
<span class="normal"><a href="#__codelineno-4-24">24</a></span>
<span class="normal"><a href="#__codelineno-4-25">25</a></span>
<span class="normal"><a href="#__codelineno-4-26">26</a></span>
<span class="normal"><a href="#__codelineno-4-27">27</a></span>
<span class="normal"><a href="#__codelineno-4-28">28</a></span>
<span class="normal"><a href="#__codelineno-4-29">29</a></span>
<span class="normal"><a href="#__codelineno-4-30">30</a></span>
<span class="normal"><a href="#__codelineno-4-31">31</a></span>
<span class="normal"><a href="#__codelineno-4-32">32</a></span>
<span class="normal"><a href="#__codelineno-4-33">33</a></span>
<span class="normal"><a href="#__codelineno-4-34">34</a></span>
<span class="normal"><a href="#__codelineno-4-35">35</a></span>
<span class="normal"><a href="#__codelineno-4-36">36</a></span>
<span class="normal"><a href="#__codelineno-4-37">37</a></span>
<span class="normal"><a href="#__codelineno-4-38">38</a></span>
<span class="normal"><a href="#__codelineno-4-39">39</a></span>
<span class="normal"><a href="#__codelineno-4-40">40</a></span></pre></div></td><td class="code"><div><pre><span></span><code><a id="__codelineno-4-1" name="__codelineno-4-1"></a><span class="k">import</span><span class="w"> </span><span class="nx">React</span><span class="w"> </span><span class="kr">from</span><span class="w"> </span><span class="s2">"react"</span><span class="p">;</span>
<a id="__codelineno-4-2" name="__codelineno-4-2"></a><span class="k">import</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="nx">shallow</span><span class="p">,</span><span class="w"> </span><span class="nx">mount</span><span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="kr">from</span><span class="w"> </span><span class="s2">"enzyme"</span><span class="p">;</span>
<a id="__codelineno-4-3" name="__codelineno-4-3"></a><span class="c1">// eventual wrapper components (react-router, react-redux's provider, ...) for mount render</span>
<a id="__codelineno-4-4" name="__codelineno-4-4"></a>
<a id="__codelineno-4-5" name="__codelineno-4-5"></a><span class="c1">// shallow renders single component w/o children, no DOM generated</span>
<a id="__codelineno-4-6" name="__codelineno-4-6"></a><span class="c1">// mount renders component w/ it's children</span>
<a id="__codelineno-4-7" name="__codelineno-4-7"></a>
<a id="__codelineno-4-8" name="__codelineno-4-8"></a><span class="k">import</span><span class="w"> </span><span class="nx">Component</span><span class="w"> </span><span class="kr">from</span><span class="w"> </span><span class="s2">"./path/to/Component"</span><span class="p">;</span>
<a id="__codelineno-4-9" name="__codelineno-4-9"></a>
<a id="__codelineno-4-10" name="__codelineno-4-10"></a><span class="c1">// factory to setup shallow test easily</span>
<a id="__codelineno-4-11" name="__codelineno-4-11"></a><span class="kd">function</span><span class="w"> </span><span class="nx">testHelper</span><span class="p">(</span><span class="nx">args</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-4-12" name="__codelineno-4-12"></a><span class="w"> </span><span class="kd">const</span><span class="w"> </span><span class="nx">defaultProps</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="cm">/* default value for props in each test */</span><span class="w"> </span><span class="p">};</span>
<a id="__codelineno-4-13" name="__codelineno-4-13"></a>
<a id="__codelineno-4-14" name="__codelineno-4-14"></a><span class="w"> </span><span class="kd">const</span><span class="w"> </span><span class="nx">props</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="p">...</span><span class="nx">defaultProps</span><span class="p">,</span><span class="w"> </span><span class="p">...</span><span class="nx">args</span><span class="w"> </span><span class="p">};</span>
<a id="__codelineno-4-15" name="__codelineno-4-15"></a><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="nx">shallow</span><span class="p">(</span><span class="o"><</span><span class="nx">Component</span><span class="w"> </span><span class="p">{...</span><span class="nx">props</span><span class="p">}</span><span class="w"> </span><span class="o">/></span><span class="p">);</span>
<a id="__codelineno-4-16" name="__codelineno-4-16"></a><span class="p">}</span>
<a id="__codelineno-4-17" name="__codelineno-4-17"></a>
<a id="__codelineno-4-18" name="__codelineno-4-18"></a><span class="c1">// shallow rendering test</span>
<a id="__codelineno-4-19" name="__codelineno-4-19"></a><span class="nx">it</span><span class="p">(</span><span class="s2">"test description"</span><span class="p">,</span><span class="w"> </span><span class="p">()</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-4-20" name="__codelineno-4-20"></a><span class="w"> </span><span class="kd">const</span><span class="w"> </span><span class="nx">dom</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nx">testHelper</span><span class="p">(</span><span class="cm">/* optional args */</span><span class="p">);</span>
<a id="__codelineno-4-21" name="__codelineno-4-21"></a><span class="w"> </span><span class="c1">// or</span>
<a id="__codelineno-4-22" name="__codelineno-4-22"></a><span class="w"> </span><span class="kd">const</span><span class="w"> </span><span class="nx">dom</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nx">shallow</span><span class="p">(</span><span class="o"><</span><span class="nx">Component</span><span class="w"> </span><span class="cm">/* props */</span><span class="w"> </span><span class="o">/></span><span class="p">);</span>
<a id="__codelineno-4-23" name="__codelineno-4-23"></a>
<a id="__codelineno-4-24" name="__codelineno-4-24"></a><span class="w"> </span><span class="c1">// check a property of expected component</span>
<a id="__codelineno-4-25" name="__codelineno-4-25"></a><span class="w"> </span><span class="c1">// selector can be from raw JSX (name of a component)</span>
<a id="__codelineno-4-26" name="__codelineno-4-26"></a><span class="w"> </span><span class="nx">expect</span><span class="p">(</span><span class="nx">dom</span><span class="p">.</span><span class="nx">find</span><span class="p">(</span><span class="s2">"selector"</span><span class="p">).</span><span class="nx">property</span><span class="p">).</span><span class="nx">toBe</span><span class="p">(</span><span class="nx">expected</span><span class="p">);</span>
<a id="__codelineno-4-27" name="__codelineno-4-27"></a><span class="p">});</span>
<a id="__codelineno-4-28" name="__codelineno-4-28"></a>
<a id="__codelineno-4-29" name="__codelineno-4-29"></a><span class="c1">// mount rendering test</span>
<a id="__codelineno-4-30" name="__codelineno-4-30"></a><span class="k">if</span><span class="p">(</span><span class="s2">"test description"</span><span class="w"> </span><span class="p">()</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-4-31" name="__codelineno-4-31"></a><span class="w"> </span><span class="kd">const</span><span class="w"> </span><span class="nx">dom</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nx">mount</span><span class="p">(</span>
<a id="__codelineno-4-32" name="__codelineno-4-32"></a><span class="w"> </span><span class="o"><</span><span class="nx">WrapperComponent</span><span class="o">></span>
<a id="__codelineno-4-33" name="__codelineno-4-33"></a><span class="w"> </span><span class="o"><</span><span class="nx">Component</span><span class="w"> </span><span class="cm">/* props */</span><span class="o">/></span>
<a id="__codelineno-4-34" name="__codelineno-4-34"></a><span class="w"> </span><span class="o"><</span><span class="err">/WrapperComponent></span>
<a id="__codelineno-4-35" name="__codelineno-4-35"></a><span class="w"> </span><span class="p">);</span>
<a id="__codelineno-4-36" name="__codelineno-4-36"></a>
<a id="__codelineno-4-37" name="__codelineno-4-37"></a><span class="w"> </span><span class="c1">// selector has to be HTML selector since the component is rendered completely</span>
<a id="__codelineno-4-38" name="__codelineno-4-38"></a><span class="w"> </span><span class="c1">// possible to test child components</span>
<a id="__codelineno-4-39" name="__codelineno-4-39"></a><span class="w"> </span><span class="nx">expect</span><span class="p">(</span><span class="nx">dom</span><span class="p">.</span><span class="nx">find</span><span class="p">(</span><span class="s2">"selector"</span><span class="p">).</span><span class="nx">property</span><span class="p">).</span><span class="nx">toBe</span><span class="p">(</span><span class="nx">expected</span><span class="p">);</span>
<a id="__codelineno-4-40" name="__codelineno-4-40"></a><span class="p">});</span>
</code></pre></div></td></tr></table></div>
<hr />
<h2 id="react-testing-library"><a href="https://testing-library.com/docs/react-testing-library/intro/">React Testing Library</a></h2>
<p>Encourages to write test based on what the user sees. So components are always <em>mounted</em> and fully rendered.</p>
<h3 id="react-testing-library-tests">React Testing Library Tests</h3>
<p>In <code>Components.test.js</code>:</p>
<div class="highlight"><table class="highlighttable"><tr><th colspan="2" class="filename"><span class="filename">JavaScript</span></th></tr><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-5-1"> 1</a></span>
<span class="normal"><a href="#__codelineno-5-2"> 2</a></span>
<span class="normal"><a href="#__codelineno-5-3"> 3</a></span>
<span class="normal"><a href="#__codelineno-5-4"> 4</a></span>
<span class="normal"><a href="#__codelineno-5-5"> 5</a></span>
<span class="normal"><a href="#__codelineno-5-6"> 6</a></span>
<span class="normal"><a href="#__codelineno-5-7"> 7</a></span>
<span class="normal"><a href="#__codelineno-5-8"> 8</a></span>
<span class="normal"><a href="#__codelineno-5-9"> 9</a></span>
<span class="normal"><a href="#__codelineno-5-10">10</a></span>
<span class="normal"><a href="#__codelineno-5-11">11</a></span>
<span class="normal"><a href="#__codelineno-5-12">12</a></span>
<span class="normal"><a href="#__codelineno-5-13">13</a></span>
<span class="normal"><a href="#__codelineno-5-14">14</a></span>
<span class="normal"><a href="#__codelineno-5-15">15</a></span>
<span class="normal"><a href="#__codelineno-5-16">16</a></span>
<span class="normal"><a href="#__codelineno-5-17">17</a></span>
<span class="normal"><a href="#__codelineno-5-18">18</a></span>
<span class="normal"><a href="#__codelineno-5-19">19</a></span>
<span class="normal"><a href="#__codelineno-5-20">20</a></span>
<span class="normal"><a href="#__codelineno-5-21">21</a></span></pre></div></td><td class="code"><div><pre><span></span><code><a id="__codelineno-5-1" name="__codelineno-5-1"></a><span class="k">import</span><span class="w"> </span><span class="nx">React</span><span class="w"> </span><span class="kr">from</span><span class="w"> </span><span class="s2">"react"</span><span class="p">;</span>
<a id="__codelineno-5-2" name="__codelineno-5-2"></a><span class="k">import</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="nx">cleanup</span><span class="p">,</span><span class="w"> </span><span class="nx">render</span><span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="kr">from</span><span class="w"> </span><span class="s2">"@testing-library/react"</span><span class="p">;</span>
<a id="__codelineno-5-3" name="__codelineno-5-3"></a>
<a id="__codelineno-5-4" name="__codelineno-5-4"></a><span class="k">import</span><span class="w"> </span><span class="nx">Component</span><span class="w"> </span><span class="kr">from</span><span class="w"> </span><span class="s2">"./path/to/Component"</span><span class="p">;</span>
<a id="__codelineno-5-5" name="__codelineno-5-5"></a>
<a id="__codelineno-5-6" name="__codelineno-5-6"></a><span class="nx">afterEach</span><span class="p">(</span><span class="nx">cleanup</span><span class="p">);</span>
<a id="__codelineno-5-7" name="__codelineno-5-7"></a>
<a id="__codelineno-5-8" name="__codelineno-5-8"></a><span class="c1">// factory to setup test easily</span>
<a id="__codelineno-5-9" name="__codelineno-5-9"></a><span class="kd">function</span><span class="w"> </span><span class="nx">testHelper</span><span class="p">(</span><span class="nx">args</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-5-10" name="__codelineno-5-10"></a><span class="w"> </span><span class="kd">const</span><span class="w"> </span><span class="nx">defaultProps</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="cm">/* default value for props in each test */</span><span class="w"> </span><span class="p">};</span>
<a id="__codelineno-5-11" name="__codelineno-5-11"></a>
<a id="__codelineno-5-12" name="__codelineno-5-12"></a><span class="w"> </span><span class="kd">const</span><span class="w"> </span><span class="nx">props</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="p">...</span><span class="nx">defaultProps</span><span class="p">,</span><span class="w"> </span><span class="p">...</span><span class="nx">args</span><span class="w"> </span><span class="p">};</span>
<a id="__codelineno-5-13" name="__codelineno-5-13"></a><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="nx">render</span><span class="p">(</span><span class="o"><</span><span class="nx">Component</span><span class="w"> </span><span class="p">{...</span><span class="nx">props</span><span class="p">}</span><span class="w"> </span><span class="o">/></span><span class="p">);</span>
<a id="__codelineno-5-14" name="__codelineno-5-14"></a><span class="p">}</span>
<a id="__codelineno-5-15" name="__codelineno-5-15"></a>
<a id="__codelineno-5-16" name="__codelineno-5-16"></a><span class="nx">it</span><span class="p">(</span><span class="s2">"test description"</span><span class="p">,</span><span class="w"> </span><span class="p">()</span><span class="w"> </span><span class="p">=></span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-5-17" name="__codelineno-5-17"></a><span class="w"> </span><span class="kd">const</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="nx">getByText</span><span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nx">testHelper</span><span class="p">();</span>
<a id="__codelineno-5-18" name="__codelineno-5-18"></a>
<a id="__codelineno-5-19" name="__codelineno-5-19"></a><span class="w"> </span><span class="c1">// react testing library func</span>
<a id="__codelineno-5-20" name="__codelineno-5-20"></a><span class="w"> </span><span class="nx">getByText</span><span class="p">(</span><span class="s2">"text"</span><span class="p">);</span><span class="w"> </span><span class="c1">// check if test is present in the rendered component</span>
<a id="__codelineno-5-21" name="__codelineno-5-21"></a><span class="p">});</span>
</code></pre></div></td></tr></table></div>
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