react-dom/test-utils Deprecation Warnings

ReactDOMTestUtils.act() warning

act from react-dom/test-utils has been deprecated in favor of act from react.

Before:

import {act} from 'react-dom/test-utils';

After:

import {act} from 'react';

All APIs except act have been removed.

The React Team recommends migrating your tests to @testing-library/react for a modern and well supported testing experience.

renderIntoDocument can be replaced with render from @testing-library/react.

Before:

import {renderIntoDocument} from 'react-dom/test-utils';

renderIntoDocument(<Component />);

After:

import {render} from '@testing-library/react';

render(<Component />);

Simulate can be replaced with fireEvent from @testing-library/react.

Before:

import {Simulate} from 'react-dom/test-utils';

const element = document.querySelector('button');
Simulate.click(element);

After:

import {fireEvent} from '@testing-library/react';

const element = document.querySelector('button');
fireEvent.click(element);

Be aware that fireEvent dispatches an actual event on the element and doesn’t just synthetically call the event handler.