react native signing for [AppName]Tests require a development team ios

No idea how the "restart" fixed anything for anyone.

If anyone else is having this problem, you need to expand the sidebar:

I just try to restart the Xcode and things seems ok now, weird though :D

I had this exact issue. I restarted Xcode many times and it didn't fix it.

Restarting my computer, however, fixed it.