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<a class="edit-page-link" href="https://github.com/facebook/react/tree/master/docs/docs/addons-test-utils.md" target="_blank">Edit on GitHub</a>
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<h1>
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Test Utilities
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</h1>
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<div class="subHeader"></div>
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<p><strong>Importing</strong></p>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="kr">import</span> <span class="nx">ReactTestUtils</span> <span class="nx">from</span> <span class="s1">'react-dom/test-utils'</span><span class="p">;</span> <span class="c1">// ES6</span>
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<span class="kd">var</span> <span class="nx">ReactTestUtils</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">'react-dom/test-utils'</span><span class="p">);</span> <span class="c1">// ES5 with npm</span>
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</code></pre></div>
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<h2>Overview</h2>
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<p><code>ReactTestUtils</code> makes it easy to test React components in the testing framework of your choice. At Facebook we use <a href="https://facebook.github.io/jest/">Jest</a> for painless JavaScript testing. Learn how to get started with Jest through the Jest website's <a href="http://facebook.github.io/jest/docs/tutorial-react.html#content">React Tutorial</a>.</p>
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<blockquote>
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<p>Note:</p>
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<p>Airbnb has released a testing utility called Enzyme, which makes it easy to assert, manipulate, and traverse your React Components' output. If you're deciding on a unit testing utility to use together with Jest, or any other test runner, it's worth checking out: <a href="http://airbnb.io/enzyme/">http://airbnb.io/enzyme/</a></p>
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</blockquote>
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<ul>
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<li><a href="#simulate"><code>Simulate</code></a></li>
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<li><a href="#renderintodocument"><code>renderIntoDocument()</code></a></li>
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<li><a href="#mockcomponent"><code>mockComponent()</code></a></li>
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<li><a href="#iselement"><code>isElement()</code></a></li>
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<li><a href="#iselementoftype"><code>isElementOfType()</code></a></li>
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<li><a href="#isdomcomponent"><code>isDOMComponent()</code></a></li>
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<li><a href="#iscompositecomponent"><code>isCompositeComponent()</code></a></li>
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<li><a href="#iscompositecomponentwithtype"><code>isCompositeComponentWithType()</code></a></li>
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<li><a href="#findallinrenderedtree"><code>findAllInRenderedTree()</code></a></li>
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<li><a href="#scryrendereddomcomponentswithclass"><code>scryRenderedDOMComponentsWithClass()</code></a></li>
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<li><a href="#findrendereddomcomponentwithclass"><code>findRenderedDOMComponentWithClass()</code></a></li>
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<li><a href="#scryrendereddomcomponentswithtag"><code>scryRenderedDOMComponentsWithTag()</code></a></li>
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<li><a href="#findrendereddomcomponentwithtag"><code>findRenderedDOMComponentWithTag()</code></a></li>
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<li><a href="#scryrenderedcomponentswithtype"><code>scryRenderedComponentsWithType()</code></a></li>
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<li><a href="#findrenderedcomponentwithtype"><code>findRenderedComponentWithType()</code></a></li>
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</ul>
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<h2>Reference</h2>
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<h3><code>Simulate</code></h3>
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<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">element</span><span class="p">,</span>
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<span class="p">[</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.</p>
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<p><code>Simulate</code> has a method for <a href="/react/docs/events.html#supported-events">every event that React understands</a>.</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="kr">const</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="kr">const</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><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">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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<blockquote>
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<p>Note</p>
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<p>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.</p>
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</blockquote>
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<hr>
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<h3><code>renderIntoDocument()</code></h3>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">renderIntoDocument</span><span class="p">(</span><span class="nx">element</span><span class="p">)</span>
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</code></pre></div>
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<p>Render a React element 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> globally available <strong>before</strong> you import <code>React</code>. 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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<hr>
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<h3><code>mockComponent()</code></h3>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">mockComponent</span><span class="p">(</span>
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<span class="nx">componentClass</span><span class="p">,</span>
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<span class="p">[</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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<hr>
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<h3><code>isElement()</code></h3>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">isElement</span><span class="p">(</span><span class="nx">element</span><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 React element.</p>
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<hr>
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<h3><code>isElementOfType()</code></h3>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">isElementOfType</span><span class="p">(</span>
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<span class="nx">element</span><span class="p">,</span>
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<span class="nx">componentClass</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 a React element whose type is of a React <code>componentClass</code>.</p>
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<hr>
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<h3><code>isDOMComponent()</code></h3>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">isDOMComponent</span><span class="p">(</span><span class="nx">instance</span><span class="p">)</span>
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</code></pre></div>
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<p>Returns <code>true</code> if <code>instance</code> is a DOM component (such as a <code><div></code> or <code><span></code>).</p>
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<hr>
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<h3><code>isCompositeComponent()</code></h3>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">isCompositeComponent</span><span class="p">(</span><span class="nx">instance</span><span class="p">)</span>
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</code></pre></div>
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<p>Returns <code>true</code> if <code>instance</code> is a user-defined component, such as a class or a function.</p>
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<hr>
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<h3><code>isCompositeComponentWithType()</code></h3>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">isCompositeComponentWithType</span><span class="p">(</span>
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<span class="nx">instance</span><span class="p">,</span>
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<span class="nx">componentClass</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>instance</code> is a component whose type is of a React <code>componentClass</code>.</p>
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<hr>
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<h3><code>findAllInRenderedTree()</code></h3>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">findAllInRenderedTree</span><span class="p">(</span>
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<span class="nx">tree</span><span class="p">,</span>
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<span class="nx">test</span>
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<span class="p">)</span>
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</code></pre></div>
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<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>
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<hr>
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<h3><code>scryRenderedDOMComponentsWithClass()</code></h3>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">scryRenderedDOMComponentsWithClass</span><span class="p">(</span>
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<span class="nx">tree</span><span class="p">,</span>
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<span class="nx">className</span>
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<span class="p">)</span>
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</code></pre></div>
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<p>Finds all DOM elements of components in the rendered tree that are DOM components with the class name matching <code>className</code>.</p>
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<hr>
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<h3><code>findRenderedDOMComponentWithClass()</code></h3>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">findRenderedDOMComponentWithClass</span><span class="p">(</span>
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<span class="nx">tree</span><span class="p">,</span>
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<span class="nx">className</span>
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<span class="p">)</span>
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</code></pre></div>
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<p>Like <a href="#scryrendereddomcomponentswithclass"><code>scryRenderedDOMComponentsWithClass()</code></a> 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>
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<hr>
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<h3><code>scryRenderedDOMComponentsWithTag()</code></h3>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">scryRenderedDOMComponentsWithTag</span><span class="p">(</span>
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<span class="nx">tree</span><span class="p">,</span>
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<span class="nx">tagName</span>
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<span class="p">)</span>
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</code></pre></div>
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<p>Finds all DOM elements of components in the rendered tree that are DOM components with the tag name matching <code>tagName</code>.</p>
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<hr>
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<h3><code>findRenderedDOMComponentWithTag()</code></h3>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">findRenderedDOMComponentWithTag</span><span class="p">(</span>
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<span class="nx">tree</span><span class="p">,</span>
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<span class="nx">tagName</span>
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<span class="p">)</span>
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</code></pre></div>
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<p>Like <a href="#scryrendereddomcomponentswithtag"><code>scryRenderedDOMComponentsWithTag()</code></a> 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>
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<hr>
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<h3><code>scryRenderedComponentsWithType()</code></h3>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">scryRenderedComponentsWithType</span><span class="p">(</span>
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<span class="nx">tree</span><span class="p">,</span>
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<span class="nx">componentClass</span>
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<span class="p">)</span>
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</code></pre></div>
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<p>Finds all instances of components with type equal to <code>componentClass</code>.</p>
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<hr>
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<h3><code>findRenderedComponentWithType()</code></h3>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">findRenderedComponentWithType</span><span class="p">(</span>
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<span class="nx">tree</span><span class="p">,</span>
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<span class="nx">componentClass</span>
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<span class="p">)</span>
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</code></pre></div>
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<p>Same as <a href="#scryrenderedcomponentswithtype"><code>scryRenderedComponentsWithType()</code></a> 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>
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<hr>
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<h2>Shallow Rendering</h2>
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<h3><code>createRenderer()</code></h3>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">createRenderer</span><span class="p">()</span>
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</code></pre></div>
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<p>Call this in your tests to create a <a href="#shallow-rendering">shallow renderer</a>.</p>
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<hr>
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<h3><code>shallowRenderer.render()</code></h3>
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<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>
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<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>Similar to <a href="/react/docs/react-dom.html#render"><code>ReactDOM.render</code></a> but it doesn't require DOM and only renders a single level deep. See <a href="#shallow-rendering">Shallow Rendering</a>.</p>
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<hr>
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<h3><code>shallowRenderer.getRenderOutput()</code></h3>
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<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">shallowRenderer</span><span class="p">.</span><span class="nx">getRenderOutput</span><span class="p">()</span>
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</code></pre></div>
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<p>After <a href="#shallowrenderer.render"><code>shallowRenderer.render()</code></a> has been called, returns shallowly rendered output.</p>
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<div class="docs-prevnext">
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</div>
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</div>
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<div class="nav-docs">
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<div class="nav-docs-section">
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<h3>Quick Start</h3>
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<ul>
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<li>
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<a href="/react/docs/installation.html">Installation</a>
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</li>
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<li>
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<a href="/react/docs/hello-world.html">Hello World</a>
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</li>
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<li>
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<a href="/react/docs/introducing-jsx.html">Introducing JSX</a>
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</li>
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<li>
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<a href="/react/docs/rendering-elements.html">Rendering Elements</a>
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</li>
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<li>
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<a href="/react/docs/components-and-props.html">Components and Props</a>
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</li>
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