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<meta content="shallow() · mount() · wrap.setProps() · wrap.find().simulate(&#39;click&#39;) · wrap.contains(&lt;div/&gt;) · Enzyme lets you write unit tests for React components. This guide covers Enzyme 3.x." name="description">
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<h1 class='h1'>Enzyme <em>cheatsheet</em></h1>
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<div class='intro-content MarkdownBody'>
<p><a href="http://airbnb.io/enzyme">Enzyme</a> lets you write unit tests for React components. This guide covers Enzyme 3.x.</p>
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<main class='post-content MarkdownBody' data-js-main-body data-js-anchors role='main'>
<h2 id="getting-started">Getting started</h2>
<h3 class="-prime" id="mounting">Mounting</h3>
<pre class="-setup"><code class="language-js">import {shallow, mount} from 'enzyme'
</code></pre>
<pre><code class="language-js">wrap = shallow(&lt;MyComponent /&gt;)
</code></pre>
<pre><code class="language-js">wrap = mount(&lt;MyComponent /&gt;)
</code></pre>
<p>Shallow wrapping doesn’t descend down to sub-components.
A full mount also mounts sub-components.</p>
<p>See: <a href="http://airbnb.io/enzyme/docs/api/shallow.html">Shallow rendering</a>,
<a href="http://airbnb.io/enzyme/docs/api/mount.html">Full rendering</a></p>
<h3 id="debugging">Debugging</h3>
<pre><code class="language-js">console.log(wrap.debug())
</code></pre>
<p>Shows HTML for debugging purposes.</p>
<p>See: <a href="http://airbnb.io/enzyme/docs/api/ReactWrapper/debug.html">debug()</a></p>
<h2 class="-three-column" id="examples">Examples</h2>
<h3 class="-prime" id="basic-example">Basic example</h3>
<pre class="-setup"><code class="language-js">import { shallow } from 'enzyme'
import MyComponent from '../MyComponent'
</code></pre>
<pre><code class="language-js">it('works', () =&gt; {
const wrap = shallow(
&lt;MyComponent name='Groot' /&gt;
)
expect(wrap.text()).toEqual('I am Groot')
})
</code></pre>
<h3 id="props-and-state">Props and state</h3>
<h4 id="setting">Setting</h4>
<pre><code class="language-js">wrap.setProps({ name: 'Moe' })
wrap.setState({ show: true })
</code></pre>
<h4 id="asserting">Asserting</h4>
<pre><code class="language-js">expect(wrap.prop('name')).toEqual('Moe')
expect(wrap.state('show')).toEqual(true)
</code></pre>
<pre><code class="language-js">expect('name' in wrap.props()).toEqual('Moe')
expect('show' in wrap.state()).toEqual(true)
</code></pre>
<h3 id="matching-elements">Matching elements</h3>
<pre><code class="language-js">expect(
wrap.containsMatchingElement(
&lt;span&gt;I am groot&lt;/span&gt;
)
).toBeTruthy()
</code></pre>
<p><code>containsMatchingElement()</code> is probably the most useful assertion in Jest.</p>
<h3 id="snapshots">Snapshots</h3>
<pre><code class="language-js">expect(wrap).toMatchSnapshot()
</code></pre>
<p>Be sure you’ve set up enzyme-to-json for snapshots (see <a href="#installing">Installing</a> below).</p>
<h3 id="traversions">Traversions</h3>
<pre><code class="language-js">expect(
wrap.find('button').text()
).toEqual('Submit')
</code></pre>
<p>Use <code>.find()</code> to traverse down to nodes. It will return wrapper objects, too.</p>
<h3 id="simulating-events">Simulating events</h3>
<pre><code class="language-js">wrap.find('input').simulate('click')
</code></pre>
<h4 id="with-event-object-props">With event object props</h4>
<pre><code class="language-js">wrap.find('input').simulate('change', {
target: { value: 'hello' }
})
</code></pre>
<h2 id="installing">Installing</h2>
<h3 id="initial-setup">Initial setup</h3>
<pre class="-setup"><code>npm install --save-dev enzyme \
enzyme-adapter-react-16 \
react-test-renderer
</code></pre>
<h4 id="testsetupjs">test/setup.js</h4>
<pre><code class="language-js">import Enzyme from 'enzyme'
import Adapter from 'enzyme-adapter-react-16'
Enzyme.configure({ adapter: new Adapter() })
</code></pre>
<h4 id="packagejson">package.json</h4>
<pre><code class="language-js">"jest": {
"setupFiles": [
"test/setup.js"
]
}
</code></pre>
<p>This configures Enzyme for React v16, and Jest to automatically configure Enzyme for you. There are other adapters in Enzyme’s installation instructions.</p>
<p>See: <a href="http://airbnb.io/enzyme/#installation">Installation</a></p>
<h3 id="jest-snapshots">Jest snapshots</h3>
<pre class="-setup"><code>npm install --save-dev enzyme-to-json
</code></pre>
<h4 id="packagejson-1">package.json</h4>
<pre><code class="language-js">"jest": {
"snapshotSerializers": [
"enzyme-to-json/serializer"
]
}
</code></pre>
<h4 id="test">Test</h4>
<pre><code class="language-js">it('works', () =&gt; {
wrap = mount(&lt;MyComponent /&gt;)
expect(wrap).toMatchSnapshot()
})
</code></pre>
<p>Optional, but recommended: This allows you to use Enzyme wrappers with Jest snapshots.</p>
<p>See: <a href="https://www.npmjs.com/package/enzyme-to-json">enzyme-to-json</a></p>
<h2 id="reactwrapper">ReactWrapper</h2>
<h3 id="traversing">Traversing</h3>
<pre><code class="language-js">wrap.find('button') // → ReactWrapper
wrap.filter('button') // → ReactWrapper
wrap.not('span') // → ReactWrapper (inverse of filter())
wrap.children() // → ReactWrapper
wrap.parent() // → ReactWrapper
wrap.closest('div') // → ReactWrapper
wrap.childAt(0) // → ReactWrapper
wrap.at(0) // → ReactWrapper
wrap.first() // → ReactWrapper
wrap.last() // → ReactWrapper
</code></pre>
<pre><code class="language-js">wrap.get(0) // → ReactElement
wrap.getElement() // → ReactElement
wrap.getElements() // → Array&lt;ReactElement&gt;
wrap.getDOMNode() // → DOMComponent
</code></pre>
<p>See: <a href="http://airbnb.io/enzyme/docs/api/mount.html">Full rendering API</a></p>
<h3 id="actions">Actions</h3>
<pre><code class="language-js">wrap.simulate('click')
</code></pre>
<h3 id="react-components">React components</h3>
<pre><code class="language-js">wrap.setState({ ··· })
wrap.setProps({ ··· })
wrap.setContext({ ··· })
</code></pre>
<pre><code class="language-js">wrap.state() // get full state
wrap.props() // get full props
wrap.context() // get full context
</code></pre>
<pre><code class="language-js">wrap.state('key') // → any
wrap.prop('key') // → any
wrap.context('key') // → any
</code></pre>
<pre><code class="language-js">wrap.instance() // → ReactComponent
</code></pre>
<h3 id="mount">Mount</h3>
<pre><code class="language-js">wrap.mount()
wrap.unmount()
wrap.update() // calls forceUpdate()
</code></pre>
<h3 id="tests">Tests</h3>
<pre><code class="language-js">wrap.debug() // → string
wrap.html() // → string
wrap.text() // → string
wrap.type() // → string | function
wrap.name() // → string
wrap.is('.classname') // → boolean
wrap.hasClass('class') // → boolean
wrap.exists() // → boolean
wrap.contains(&lt;div /&gt;) // → boolean
wrap.contains([ &lt;div /&gt; ]) // → boolean
wrap.some('.child') // → boolean
wrap.someWhere(n =&gt; n.hasClass('foo'))
wrap.containsMatchingElement(&lt;div /&gt;) // → boolean
wrap.containsAllMatchingElements([ &lt;div /&gt; ]) // → boolean
wrap.containsAnyMatchingElements([ &lt;div /&gt; ]) // → boolean
</code></pre>
<h2 id="references">References</h2>
<ul>
<li><a href="https://airbnb.io/enzyme">Enzyme website</a> <em>(airbnb.io)</em></li>
<li><a href="./enzyme@2">Enzyme v2 cheatsheet</a> <em>(devhints.io)</em> (old version)</li>
</ul>
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