Create-React-App testing fails

[lunush]

Hi there,

I have a react component that uses your react-infinite-scroll-hook and couldn't get tests for it to work properly. I would always get the following error:

ReferenceError: IntersectionObserver is not defined

Here is a minimal reproduction example. I also used intersetion-observer polyfill as a workaround for this issue and it seems to work fine. Just toggle the first import statement in App.js.

By the way, when I tried testing that component with plain @testing-library/react, it worked just fine.