Build Xcode projects. More information: https://github.com/facebookarchive/xctool.
xctool -project {{YourProject.xcodeproj}} -scheme {{YourScheme}} build
xctool -workspace {{YourWorkspace.xcworkspace}} -scheme {{YourScheme}} build
xctool -workspace {{YourWorkspace.xcworkspace}} -scheme {{YourScheme}} clean build test