Test-aware app launch

AppDelegate.swift

import UIKit

class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        let _ = AppStore.shared
        let _ = LocationService.shared
        let _ = WeatherService.shared
        
        AppStore.shared.producer.logEvents().start()
        return true
    }
}

main.swift

import UIKit

var appDelegateClassName =
    (nil != Bundle.allBundles.first { $0.bundlePath.contains(".xctest") }) ?
        NSStringFromClass(TestAppDelegate.self) :
        NSStringFromClass(AppDelegate.self)
let argv = UnsafeMutableRawPointer(CommandLine.unsafeArgv).bindMemory(to: UnsafeMutablePointer<Int8>.self,
                                                                      capacity: Int(CommandLine.argc))
UIApplicationMain(CommandLine.argc, argv, nil, appDelegateClassName)

TestAppDelegate.swift

import UIKit

class TestAppDelegate: UIResponder, UIApplicationDelegate {
    
    var window: UIWindow?
    
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        return true
    }
}