Make the unit test a Swift Package

[uhooi]

Support flow

1. Move the following to the App folder:
   • UhooiPicBookTests/
   • UhooiPicBookUITests/
   • Develop.xcodeproj
   • Production.xcodeproj
2. Fix workspaces and projects
3. Add testTarget
4. Move all tests except Bundle to testTarget
5. Test that testTarget with the xcodebuild test command
6. Merge multiple test results
7. Run tests with CI

References

• https://qiita.com/tattn/items/894025eb6de346d07d90
• https://developer.apple.com/forums/thread/661787

[github-actions]

👋 Thanks for reporting!
Please PR :)