hooks.ts

import React from 'react';
import ReactDOM from 'react-dom';
import { act } from 'react-dom/test-utils'
import { AfterAll, BeforeAll } from 'cucumber';

import App from './path/to/your/app';

const $root = document.createElement('div');

document.body.appendChild($root);

BeforeAll(function () {
    act(() => {
        ReactDOM.render(
            <App/>,
            $root
        )
    });
});

AfterAll(function () {
    act(() => {
        ReactDOM.unmountComponentAtNode(
            $root
        )
    });
});