Locating the Unit Testing Bundle in Cocoa

If you load test data from a file when unit testing a Cocoa application, you’ll need to access the unit testing bundle to find the file. Your first instinct might be to call NSBundle’s mainBundle: method. For a unit testing target, the main bundle should be the unit testing bundle, right? Unfortunately, the mainBundle: method is for application bundles, not unit testing bundles.

Call NSBundle’s bundleForClass: method to load the unit testing bundle. The following code demonstrates how to locate the unit testing bundle:

NSBundle *unitTestBundle = [NSBundle bundleForClass:[self class]];