Unit Testing in Xcode, does it run the app?

Question

I\'m running into a strange problem that I haven\'t run into before.

When you do cmd+U to run your Unit Tests (OCUnit for example) does it actually call the main.m,

Answer 1

Excellent answers above that suggest dynamically changing the application delegate at run time.

The small modification I make is to detect a unit test run by querying NSProcessInfo. The advantage is that you don't need to have a class that can be detected to see if unit tests are running.

    int main(int argc, char * argv[])
    {
        // Put your App delegate class here.
        const Class appDelegateClass = [ATAppDelegate class];

        NSDictionary *const environmentDictionary =
        [[NSProcessInfo processInfo] environment];

        const BOOL runningUnitTests =
        environmentDictionary[@"XCInjectBundleInto"] != nil;

        NSString *delegateName = 
        runningUnitTests ? nil : NSStringFromClass(appDelegateClass);

        @autoreleasepool {
            return UIApplicationMain(argc, argv, nil, delegateName);
        }
    }

The @"XCInjectBundleInto" property in environmentDictionary is the path to your unit tests bundle and is set up by Xcode.