This is the child article of ReactTestUtils - Tutorial. In this article, I will explain how to Simulate events - Click, Change, Key Up, Mouse Over etc.
Example
Observe below example component. This component handles click, double click, mouse over, change events.
import React from 'react'; class EventComponent extends React.Component { constructor(props) { super(props); this.state = { clickClass:'', dblClickClass:'', mouseOverEventClass:'', inputVal:'' } this.clickEventFunc = this.clickEventFunc.bind(this); this.dblClickEventFunc = this.dblClickEventFunc.bind(this); this.onChange = this.onChange.bind(this); this.mouseOverEventFunc = this.mouseOverEventFunc.bind(this); } clickEventFunc() { this.setState({ clickClass:'click-class' }); } dblClickEventFunc() { this.setState({ dblClickClass:'dblclick-class' }); } mouseOverEventFunc() { this.setState({ mouseOverEventClass:'mouseover-class' }); } onChange(event) { this.setState({ inputVal:event.target.value }); } render () { return <div> <div id="clickEventDiv" className={this.state.clickClass} onClick={this.clickEventFunc}> </div> <div id="dblClickEventDiv" className={this.state.dblClickClass} onDoubleClick={this.dblClickEventFunc}> </div> <div id="mouseOverEventDiv" className={this.state.mouseOverEventClass} onMouseOver={this.mouseOverEventFunc}> </div> <input id="inputElm" value={this.state.inputVal} onChange={this.onChange}></input> </div>; } } EventComponent.propTypes = { } EventComponent.defaultProps = { } export default EventComponent;
Find Component by ID
This is small utility function which we use to find element by Id
function scryRenderedDOMComponentsWithId(tree, id) { return ReactTestUtils.findAllInRenderedTree(tree, function(inst) { return ReactTestUtils.isDOMComponent(inst) && inst.id === id; }); }
Click Event
When we click on the clickEventDiv component, click-class will be added. This test case verifies the class
it('click event test', () => { let instance = ReactTestUtils.renderIntoDocument( <EventComponent/> ); let clickDiv = scryRenderedDOMComponentsWithId(instance, "clickEventDiv"); ReactTestUtils.Simulate.click(clickDiv[0]); expect(clickDiv[0].className.match(/\bclick-class\b/)).toExist(); });
Double Click Event
When we double click on the dbClickEventDiv component, dblclick-class will be added. This test case verifies the class
it('double click event test', () => { let instance = ReactTestUtils.renderIntoDocument( <EventComponent/> ); let dbClickDiv = scryRenderedDOMComponentsWithId(instance, "dblClickEventDiv"); ReactTestUtils.Simulate.doubleClick(dbClickDiv[0]); expect(dbClickDiv[0].className.match(/\bdblclick-class\b/)).toExist(); });
Mouse Over Event
When we double click on the mouseOverEventDiv component, mouseover-class will be added. This test case verifies the class
it('mouser over event test', () => { let instance = ReactTestUtils.renderIntoDocument( <EventComponent/> ); let mOverDiv = scryRenderedDOMComponentsWithId(instance, "mouseOverEventDiv"); ReactTestUtils.Simulate.mouseOver(mOverDiv[0]); expect(mOverDiv[0].className.match(/\bmouseover-class\b/)).toExist(); });
Change Event
When we change the input value of inputElm component, inputVal state variable changes. This test case verifies the state variable
it('change event test', () => { let instance = ReactTestUtils.renderIntoDocument( <EventComponent/> ); let inputElm = scryRenderedDOMComponentsWithId(instance, "inputElm"); inputElm[0].value = 'some value'; ReactTestUtils.Simulate.change(inputElm[0]); expect(instance.state.inputVal).toEqual("some value"); });
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