One of the announcements that excited me most during last year's WWDC was Xcode's built-in support for code coverage. As of Xcode 7, you no longer have to jump through a bunch of hoops to find out how well your test suite has covered your code.
Code coverage is not enabled by default, though. In this tutorial, I show you how easy it is to enable code coverage for a project in Xcode and I also highlight a few benefits of having code coverage enabled.
Read this article on Cocoacasts.