Summary:
I am attempting to test a React component that listens to native DOM events in its componentWillMount.
I'm finding that jsdom (@8.4.0) doesn't work as expected when it comes to dispatching events and adding event listeners.
The simplest bit of code I can extract:
window.addEventListener('click', () => {
throw new Error("success")
})
const event = new Event('click')
document.dispatchEvent(event)
throw new Error('failure')
This throws "failure".
Context:
At risk of the above being an XY problem, I want to provide more context.
Here is an extracted/simplified version of the component I'm trying to test. You can see it working on Webpackbin.
import React from 'react'
export default class Example extends React.Component {
constructor() {
super()
this._onDocumentClick = this._onDocumentClick.bind(this)
}
componentWillMount() {
this.setState({ clicked: false })
window.addEventListener('click', this._onDocumentClick)
}
_onDocumentClick() {
const clicked = this.state.clicked || false
this.setState({ clicked: !clicked })
}
render() {
return <p>{JSON.stringify(this.state.clicked)}</p>
}
}
Here is the test I'm trying to write.
import React from 'react'
import ReactDOM from 'react-dom'
import { mount } from 'enzyme'
import Example from '../src/example'
describe('test', () => {
it('test', () => {
const wrapper = mount(<Example />)
const event = new Event('click')
document.dispatchEvent(event)
// at this point, I expect the component to re-render,
// with updated state.
expect(wrapper.text()).to.match(/true/)
})
})
Just for completeness, here is my test_helper.js which initializes jsdom:
import { jsdom } from 'jsdom'
import chai from 'chai'
const doc = jsdom('<!doctype html><html><body></body></html>')
const win = doc.defaultView
global.document = doc
global.window = win
Object.keys(window).forEach((key) => {
if (!(key in global)) {
global[key] = window[key]
}
})
Reproduction case:
I have a repro case here: https://github.com/jbinto/repro-jsdom-events-not-firing
git clone https://github.com/jbinto/repro-jsdom-events-not-firing.git
cd repro-jsdom-events-not-firing
npm install
npm test
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