support for xctest

[extrawurst]

I saw that #393 was closed which listed it too. I cannot find any trace that it is supported now though. Is it going to be or will it not be possible?

It would be fantastic to write on device tests entirely on the rust side for apps that use objc2

[madsmtm]

Ah, I've missed it because it's located a bit differently, namely under /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/Frameworks (similarly I've also missed XcodeKit and InterfaceBuilderKit under /Applications/Xcode.app/Contents/Developer/Library/Frameworks). Will add them to the list at some point, thanks for the info!

(That said, I'm not familiar with XCTest at all, but I suspect it might need cooperation with Xcode somehow that might not be possible with Rust).