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<a href="/react/tips/use-react-with-other-libraries.html">Use React with Other Libraries</a>
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<div class="inner-content">
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<h1>
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Test Utilities
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<a class="edit-page-link" href="https://github.com/facebook/react/tree/master/docs/docs/10.4-test-utils.md" target="_blank">Edit on GitHub</a>
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</h1>
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<div class="subHeader"></div>
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<p><code>ReactTestUtils</code> makes it easy to test React components in the testing framework of your choice (we use <a href="https://facebook.github.io/jest/">Jest</a>).</p>
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<div class="highlight"><pre><code class="language-text" data-lang="text">var ReactTestUtils = require('react-addons-test-utils');
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</code></pre></div><h3><a class="anchor" name="simulate"></a>Simulate <a class="hash-link" href="#simulate">#</a></h3><div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">Simulate</span><span class="p">.{</span><span class="nx">eventName</span><span class="p">}(</span>
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<span class="nx">DOMElement</span> <span class="nx">element</span><span class="p">,</span>
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<span class="p">[</span><span class="nx">object</span> <span class="nx">eventData</span><span class="p">]</span>
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<span class="p">)</span>
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</code></pre></div>
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<p>Simulate an event dispatch on a DOM node with optional <code>eventData</code> event data. <strong>This is possibly the single most useful utility in <code>ReactTestUtils</code>.</strong></p>
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<p><strong>Clicking an element</strong></p>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="c1">// <button ref="button">...</button></span>
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<span class="kd">var</span> <span class="nx">node</span> <span class="o">=</span> <span class="k">this</span><span class="p">.</span><span class="nx">refs</span><span class="p">.</span><span class="nx">button</span><span class="p">;</span>
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<span class="nx">ReactTestUtils</span><span class="p">.</span><span class="nx">Simulate</span><span class="p">.</span><span class="nx">click</span><span class="p">(</span><span class="nx">node</span><span class="p">);</span>
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</code></pre></div>
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<p><strong>Changing the value of an input field and then pressing ENTER.</strong></p>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="c1">// <input ref="input" /></span>
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<span class="kd">var</span> <span class="nx">node</span> <span class="o">=</span> <span class="k">this</span><span class="p">.</span><span class="nx">refs</span><span class="p">.</span><span class="nx">input</span><span class="p">;</span>
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<span class="nx">node</span><span class="p">.</span><span class="nx">value</span> <span class="o">=</span> <span class="s1">'giraffe'</span>
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<span class="nx">ReactTestUtils</span><span class="p">.</span><span class="nx">Simulate</span><span class="p">.</span><span class="nx">change</span><span class="p">(</span><span class="nx">node</span><span class="p">);</span>
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<span class="nx">ReactTestUtils</span><span class="p">.</span><span class="nx">Simulate</span><span class="p">.</span><span class="nx">keyDown</span><span class="p">(</span><span class="nx">node</span><span class="p">,</span> <span class="p">{</span><span class="nx">key</span><span class="o">:</span> <span class="s2">"Enter"</span><span class="p">,</span> <span class="nx">keyCode</span><span class="o">:</span> <span class="mi">13</span><span class="p">,</span> <span class="nx">which</span><span class="o">:</span> <span class="mi">13</span><span class="p">});</span>
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</code></pre></div>
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<p><em>Note that you will have to provide any event property that you're using in your component (e.g. keyCode, which, etc...) as React is not creating any of these for you.</em></p>
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<p><code>Simulate</code> has a method for every event that React understands.</p>
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<h3><a class="anchor" name="renderintodocument"></a>renderIntoDocument <a class="hash-link" href="#renderintodocument">#</a></h3><div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">ReactComponent</span> <span class="nx">renderIntoDocument</span><span class="p">(</span>
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<span class="nx">ReactElement</span> <span class="nx">instance</span>
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<span class="p">)</span>
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</code></pre></div>
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<p>Render a component into a detached DOM node in the document. <strong>This function requires a DOM.</strong></p>
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<blockquote>
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<p>Note:</p>
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<p>You will need to have <code>window</code>, <code>window.document</code> and <code>window.document.createElement</code>
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globally available <strong>before</strong> you import React. Otherwise React will think it can't access the DOM and methods like <code>setState</code> won't work.</p>
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</blockquote>
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<h3><a class="anchor" name="mockcomponent"></a>mockComponent <a class="hash-link" href="#mockcomponent">#</a></h3><div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">object</span> <span class="nx">mockComponent</span><span class="p">(</span>
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<span class="kd">function</span> <span class="nx">componentClass</span><span class="p">,</span>
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<span class="p">[</span><span class="nx">string</span> <span class="nx">mockTagName</span><span class="p">]</span>
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<span class="p">)</span>
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</code></pre></div>
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<p>Pass a mocked component module to this method to augment it with useful methods that allow it to be used as a dummy React component. Instead of rendering as usual, the component will become a simple <code><div></code> (or other tag if <code>mockTagName</code> is provided) containing any provided children.</p>
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<h3><a class="anchor" name="iselement"></a>isElement <a class="hash-link" href="#iselement">#</a></h3><div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="kr">boolean</span> <span class="nx">isElement</span><span class="p">(</span>
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<span class="nx">ReactElement</span> <span class="nx">element</span>
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<span class="p">)</span>
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</code></pre></div>
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<p>Returns <code>true</code> if <code>element</code> is any ReactElement.</p>
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<h3><a class="anchor" name="iselementoftype"></a>isElementOfType <a class="hash-link" href="#iselementoftype">#</a></h3><div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="kr">boolean</span> <span class="nx">isElementOfType</span><span class="p">(</span>
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<span class="nx">ReactElement</span> <span class="nx">element</span><span class="p">,</span>
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<span class="kd">function</span> <span class="nx">componentClass</span>
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<span class="p">)</span>
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</code></pre></div>
|
|
<p>Returns <code>true</code> if <code>element</code> is a ReactElement whose type is of a React <code>componentClass</code>.</p>
|
|
<h3><a class="anchor" name="isdomcomponent"></a>isDOMComponent <a class="hash-link" href="#isdomcomponent">#</a></h3><div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="kr">boolean</span> <span class="nx">isDOMComponent</span><span class="p">(</span>
|
|
<span class="nx">ReactComponent</span> <span class="nx">instance</span>
|
|
<span class="p">)</span>
|
|
</code></pre></div>
|
|
<p>Returns <code>true</code> if <code>instance</code> is a DOM component (such as a <code><div></code> or <code><span></code>).</p>
|
|
<h3><a class="anchor" name="iscompositecomponent"></a>isCompositeComponent <a class="hash-link" href="#iscompositecomponent">#</a></h3><div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="kr">boolean</span> <span class="nx">isCompositeComponent</span><span class="p">(</span>
|
|
<span class="nx">ReactComponent</span> <span class="nx">instance</span>
|
|
<span class="p">)</span>
|
|
</code></pre></div>
|
|
<p>Returns <code>true</code> if <code>instance</code> is a composite component (created with <code>React.createClass()</code>).</p>
|
|
<h3><a class="anchor" name="iscompositecomponentwithtype"></a>isCompositeComponentWithType <a class="hash-link" href="#iscompositecomponentwithtype">#</a></h3><div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="kr">boolean</span> <span class="nx">isCompositeComponentWithType</span><span class="p">(</span>
|
|
<span class="nx">ReactComponent</span> <span class="nx">instance</span><span class="p">,</span>
|
|
<span class="kd">function</span> <span class="nx">componentClass</span>
|
|
<span class="p">)</span>
|
|
</code></pre></div>
|
|
<p>Returns <code>true</code> if <code>instance</code> is a composite component (created with <code>React.createClass()</code>) whose type is of a React <code>componentClass</code>.</p>
|
|
<h3><a class="anchor" name="findallinrenderedtree"></a>findAllInRenderedTree <a class="hash-link" href="#findallinrenderedtree">#</a></h3><div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">array</span> <span class="nx">findAllInRenderedTree</span><span class="p">(</span>
|
|
<span class="nx">ReactComponent</span> <span class="nx">tree</span><span class="p">,</span>
|
|
<span class="kd">function</span> <span class="nx">test</span>
|
|
<span class="p">)</span>
|
|
</code></pre></div>
|
|
<p>Traverse all components in <code>tree</code> and accumulate all components where <code>test(component)</code> is <code>true</code>. This is not that useful on its own, but it's used as a primitive for other test utils.</p>
|
|
<h3><a class="anchor" name="scryrendereddomcomponentswithclass"></a>scryRenderedDOMComponentsWithClass <a class="hash-link" href="#scryrendereddomcomponentswithclass">#</a></h3><div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">array</span> <span class="nx">scryRenderedDOMComponentsWithClass</span><span class="p">(</span>
|
|
<span class="nx">ReactComponent</span> <span class="nx">tree</span><span class="p">,</span> <span class="nx">string</span> <span class="nx">className</span>
|
|
<span class="p">)</span>
|
|
</code></pre></div>
|
|
<p>Finds all instances of components in the rendered tree that are DOM components with the class name matching <code>className</code>.</p>
|
|
<h3><a class="anchor" name="findrendereddomcomponentwithclass"></a>findRenderedDOMComponentWithClass <a class="hash-link" href="#findrendereddomcomponentwithclass">#</a></h3><div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">ReactComponent</span> <span class="nx">findRenderedDOMComponentWithClass</span><span class="p">(</span>
|
|
<span class="nx">ReactComponent</span> <span class="nx">tree</span><span class="p">,</span>
|
|
<span class="nx">string</span> <span class="nx">className</span>
|
|
<span class="p">)</span>
|
|
</code></pre></div>
|
|
<p>Like <code>scryRenderedDOMComponentsWithClass()</code> but expects there to be one result, and returns that one result, or throws exception if there is any other number of matches besides one.</p>
|
|
<h3><a class="anchor" name="scryrendereddomcomponentswithtag"></a>scryRenderedDOMComponentsWithTag <a class="hash-link" href="#scryrendereddomcomponentswithtag">#</a></h3><div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">array</span> <span class="nx">scryRenderedDOMComponentsWithTag</span><span class="p">(</span>
|
|
<span class="nx">ReactComponent</span> <span class="nx">tree</span><span class="p">,</span>
|
|
<span class="nx">string</span> <span class="nx">tagName</span>
|
|
<span class="p">)</span>
|
|
</code></pre></div>
|
|
<p>Finds all instances of components in the rendered tree that are DOM components with the tag name matching <code>tagName</code>.</p>
|
|
<h3><a class="anchor" name="findrendereddomcomponentwithtag"></a>findRenderedDOMComponentWithTag <a class="hash-link" href="#findrendereddomcomponentwithtag">#</a></h3><div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">ReactComponent</span> <span class="nx">findRenderedDOMComponentWithTag</span><span class="p">(</span>
|
|
<span class="nx">ReactComponent</span> <span class="nx">tree</span><span class="p">,</span>
|
|
<span class="nx">string</span> <span class="nx">tagName</span>
|
|
<span class="p">)</span>
|
|
</code></pre></div>
|
|
<p>Like <code>scryRenderedDOMComponentsWithTag()</code> but expects there to be one result, and returns that one result, or throws exception if there is any other number of matches besides one.</p>
|
|
<h3><a class="anchor" name="scryrenderedcomponentswithtype"></a>scryRenderedComponentsWithType <a class="hash-link" href="#scryrenderedcomponentswithtype">#</a></h3><div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">array</span> <span class="nx">scryRenderedComponentsWithType</span><span class="p">(</span>
|
|
<span class="nx">ReactComponent</span> <span class="nx">tree</span><span class="p">,</span>
|
|
<span class="kd">function</span> <span class="nx">componentClass</span>
|
|
<span class="p">)</span>
|
|
</code></pre></div>
|
|
<p>Finds all instances of components with type equal to <code>componentClass</code>.</p>
|
|
<h3><a class="anchor" name="findrenderedcomponentwithtype"></a>findRenderedComponentWithType <a class="hash-link" href="#findrenderedcomponentwithtype">#</a></h3><div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">ReactComponent</span> <span class="nx">findRenderedComponentWithType</span><span class="p">(</span>
|
|
<span class="nx">ReactComponent</span> <span class="nx">tree</span><span class="p">,</span> <span class="kd">function</span> <span class="nx">componentClass</span>
|
|
<span class="p">)</span>
|
|
</code></pre></div>
|
|
<p>Same as <code>scryRenderedComponentsWithType()</code> but expects there to be one result and returns that one result, or throws exception if there is any other number of matches besides one.</p>
|
|
<h2><a class="anchor" name="shallow-rendering"></a>Shallow rendering <a class="hash-link" href="#shallow-rendering">#</a></h2>
|
|
<p>Shallow rendering is an experimental feature that lets you render a component "one level deep" and assert facts about what its render method returns, without worrying about the behavior of child components, which are not instantiated or rendered. This does not require a DOM.</p>
|
|
<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">ReactShallowRenderer</span> <span class="nx">createRenderer</span><span class="p">()</span>
|
|
</code></pre></div>
|
|
<p>Call this in your tests to create a shallow renderer. You can think of this as a "place" to render the component you're testing, where it can respond to events and update itself.</p>
|
|
<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">shallowRenderer</span><span class="p">.</span><span class="nx">render</span><span class="p">(</span>
|
|
<span class="nx">ReactElement</span> <span class="nx">element</span>
|
|
<span class="p">)</span>
|
|
</code></pre></div>
|
|
<p>Similar to <code>ReactDOM.render</code>.</p>
|
|
<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">ReactComponent</span> <span class="nx">shallowRenderer</span><span class="p">.</span><span class="nx">getRenderOutput</span><span class="p">()</span>
|
|
</code></pre></div>
|
|
<p>After <code>render</code> has been called, returns shallowly rendered output. You can then begin to assert facts about the output. For example, if your component's render method returns:</p>
|
|
<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="o"><</span><span class="nx">div</span><span class="o">></span>
|
|
<span class="o"><</span><span class="nx">span</span> <span class="nx">className</span><span class="o">=</span><span class="s2">"heading"</span><span class="o">></span><span class="nx">Title</span><span class="o"><</span><span class="err">/span></span>
|
|
<span class="o"><</span><span class="nx">Subcomponent</span> <span class="nx">foo</span><span class="o">=</span><span class="s2">"bar"</span> <span class="o">/></span>
|
|
<span class="o"><</span><span class="err">/div></span>
|
|
</code></pre></div>
|
|
<p>Then you can assert:</p>
|
|
<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">result</span> <span class="o">=</span> <span class="nx">renderer</span><span class="p">.</span><span class="nx">getRenderOutput</span><span class="p">();</span>
|
|
<span class="nx">expect</span><span class="p">(</span><span class="nx">result</span><span class="p">.</span><span class="nx">type</span><span class="p">).</span><span class="nx">toBe</span><span class="p">(</span><span class="s1">'div'</span><span class="p">);</span>
|
|
<span class="nx">expect</span><span class="p">(</span><span class="nx">result</span><span class="p">.</span><span class="nx">props</span><span class="p">.</span><span class="nx">children</span><span class="p">).</span><span class="nx">toEqual</span><span class="p">([</span>
|
|
<span class="o"><</span><span class="nx">span</span> <span class="nx">className</span><span class="o">=</span><span class="s2">"heading"</span><span class="o">></span><span class="nx">Title</span><span class="o"><</span><span class="err">/span>,</span>
|
|
<span class="o"><</span><span class="nx">Subcomponent</span> <span class="nx">foo</span><span class="o">=</span><span class="s2">"bar"</span> <span class="o">/></span>
|
|
<span class="p">]);</span>
|
|
</code></pre></div>
|
|
<p>Shallow testing currently has some limitations, namely not supporting refs. We're releasing this feature early and would appreciate the React community's feedback on how it should evolve.</p>
|
|
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