Add tests for components in React StrictMode

[devongovett]

🙋 Feature Request

We should have tests for all components to sure they work in react StrictMode. This is the default for new apps in create-react-app, so if there's issues, it's likely people will see them. I believe last time I tried I ran into some problems, so it would be good to fix those and have unit tests to ensure it works. This may also require upgrading some libraries (e.g. react-transition-group?).

🧢 Your Company/Team

RSP

[tomsontom]

I think until this is fixed it should be mentionned in the "Get Started" section at https://react-spectrum.adobe.com/react-spectrum/getting-started.html

[mischnic]

This may also require upgrading some libraries (e.g. react-transition-group?).

Updating and moving to this pattern of passing a ref to <Transition> so that it doesn't use findDOMNode anymore: https://github.com/reactjs/react-transition-group/blob/master/CHANGELOG.md#440-2020-05-05

[stefanprobst]

hi, echoing the above - i think it would be good to mention in the docs somewhere that currently there are issues with StrictMode (running into #977 myself).