Enzyme Example

require("react-dom") require("react-addons-test-utils"); const React = require('react'); const Component = require('react').Component; const expect = require('chai').expect; const shallow = require('enzyme').shallow; class MyComponent extends Component { constructor(props) { super(props); this.state = { counter: 0, }; } render() { return ( <div> {this.state.counter} <button onClick={() => this.setState({ counter: this.state.counter + 1 })} /> </div> ); } } const wrapper = shallow(<MyComponent />); expect(wrapper.text()).to.contain(0); wrapper.find('button').simulate('click'); expect(wrapper.text()).to.contain(1);