AppDelegate to run unit tests faster in Swift.

gistfile1.swift

1. Comment out @UIApplicationMain in your AppDelegate.

2. Create main.swift file with the following code:

import Foundation
import UIKit

let isRunningTests = NSClassFromString("XCTestCase") != nil

if isRunningTests {
    
    UIApplicationMain(Process.argc, Process.unsafeArgv, nil, NSStringFromClass(TestingAppDelegate))
    
} else {
    
    UIApplicationMain(Process.argc, Process.unsafeArgv, nil, NSStringFromClass(AppDelegate))
}

3. Create TestingAppDelegate.swift with the following code:

import UIKit

class TestingAppDelegate: UIResponder, UIApplicationDelegate {
 
    var window: UIWindow?
}

4. In your AppDelegate, create the window, assign its root view controller and make it key and visible.