Method constructor

test-utils/test/shared/rerender.test.jsx:27–32

(props)

		let increment;
		class Counter extends Component {
			constructor(props) {
				super(props);

				this.state = { count: 0 };
				increment = () => this.setState({ count: this.state.count + 1 });
			}

			render() {
				return <div>{this.state.count}</div>;