Including Asset Catalogue in Test Targets
The answer by @mylovemhz is correct but incomplete. You need to reference the bundle:
Swift 3:
UIImage(named: "imageName", in: Bundle(for: MyTestClass.self), compatibleWith: nil)Also ensure that your asset is included in the same target as your test class.
According to the documentation, you have to add them at runtime.
If your tests use assets—data files, images, and so forth—they can be added to the test bundle and accessed at run time using the NSBundle APIs. Using
+[NSBundle bundleForClass:]with your test class ensures that you obtain the correct bundle to retrieve assets. For more information, see NSBundle Class Reference.
In Swift, it would be something along the lines of:
let appBundle = Bundle(for: type(of: MyClass) as! AnyClass)