This library enables you to write unit tests which test the layout of a view in multiple configurations. It tests the view with different data combinations and different view sizes. The library works in both Objective-C and Swift.In just one test, your view will be laid out multiple times with different data. You can then run test assertions on these views to verify that the layout and view content is correct. Also, the library will run a few tests automatically such as checking for Autolayout errors, missing accessibility, and overlapping views. Finally, the library makes it easy to test each view with different sizes so you can verify the view will work on different devices.