![]() When you reference an image in your code, you’ll always refer to the non-Retina name (for example, what you see listed as the image name in the asset catalog). This is an asset catalog, which we cover in more detail in a few minutes. You’ll also notice a folder icon labeled Images.xcassets. This contains files that, although necessary for your application to work correctly, are rarely edited by hand. If you dig a bit further, you’ll find a Supporting Files group within the Project Code folder. We do not get into unit tests in this book they are simply a tool for developers to use on large projects and not needed to learn how to develop for iOS. Unit tests are small pieces of code written to test discrete chunks of application functionality.
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