When using the @testing-library/react you can write jsx to test your components.

If you use:

render(<><MyComponent /><SecondComponent /></>)

You may get an error saying it can’t unmount the component.

Warning: unmountComponentAtNode(): The node you're attempting to unmount was rendered by another copy of React.

Possibly related to the <></> not properly being a main component for a react tree. Removing or replacing this prevents the error.

render(<div><MyComponent /><SecondComponent /></div>)

There may be another way to resolve this but this works if you don’t care about the nesting div.