LayoutTest is user-friendly and easy to use OS X application designed to help developer to test if a batch of dynamic translation strings fit within their text fields. In order to test your strings using the LayoutTest utility, you will have to enter them via the pre-defined text areas displayed within the app's main window. Building from source: Double click the included Xcode project and choose Build from the Build menu in Xcode. This will build the application in the "/build/Debug" folder inside the source directory. If using Xcode 4.2 or later you can find the build in the /Users/username/Library/Developer/Xcode/DerivedData folder.