在AppDelegate中為每個或單獨的單元和集成測驗測驗不同的行為-有解無憂

我想測驗決定應用程式啟動的應用程式行為。例如：在選項卡欄控制器中，將創建多少個選項卡和哪些選項卡是在創建根視窗的應用啟動時決定的，因此我想為每個測驗用例測驗這些行為。

此新功能是通過 A/B 服務設定的，并且僅在應用啟動期間檢索到的值。根據該值，設定選項卡欄的視圖控制器。

例如：

var viewControllers: [UIViewController] = [ tabOne, tabTwo]
if Config.isNewFeatureEnabled {
    viewControllers.append(self._menuCoordinator.rootViewController)
} else {
    viewControllers.append(self._anotherTabBarController)
    viewControllers.append(self._anotherCoordinator.rootViewController)
    viewControllers.append(self._someOtherCoordinator.rootViewController)
}
_tabBarController.viewControllers = viewControllers

讓我輸入代碼，為了簡化測驗，我創建了一個協議（不一定是更好的注入方法）

protocol FeatureFlag {
    var isNewFeatureEnabled: Bool { get set }
}

// Implementation
class FeatureFlagService: FeatureFlag {
   var isNewFeatureEnabled = false
   // Bunch of other feature flags
}

在我的測驗用例中，我想在不影回應用程式另一端的情況下切換配置。像這樣的東西：

class NewFeatureVisibilityTests: XCTestCase {
    func test_TabBar_has_threeTabs_when_NewFeature_isEnabled() {
        // Looking for a way to inject the config

        let tabBar = getKeyWindow()?.rootViewController as? UITabBarController

        guard let tabBar = appDel.currentWindow?.rootViewController as? UITabBarController else {
            return XCTFail("Expected root view controller to be a tab bar controller")
        }

        XCTAssertEqual(tabBar.viewControllers?.count, 3)
    }

    func test_TabBar_has_fiveTabs_when_NewFeature_isDisabled() {
        // Looking for a way to inject the config

        let tabBar = getKeyWindow()?.rootViewController as? UITabBarController

        guard let tabBar = appDel.currentWindow?.rootViewController as? UITabBarController else {
            return XCTFail("Expected root view controller to be a tab bar controller")
        }

        XCTAssertEqual(tabBar.viewControllers?.count, 5)
    }
}

我想要的是通過注入（配置等）為每個測驗用例設定應用程式的行為。

一項測驗將啟用該功能，另一項測驗將斷言該功能禁用狀態。

uj5u.com熱心網友回復：

在 AppDelegate 中使用現有型別FeatureFlag以及覆寫初始化的默認值創建一個配置屬性。

extension UIApplication {
    var currentWindow: UIWindow {
        return (connectedScenes
            .filter({$0.activationState == .foregroundActive})
            .compactMap({$0 as? UIWindowScene})
            .first?.windows
            .filter({$0.isKeyWindow}).first!)!
    }
}

@main
class AppDelegate: UIResponder, UIApplicationDelegate {
    
    var window: UIWindow?
    let config: FeatureFlag!
    
    override init() {
        config = FeatureFlagService()
    }
    
    init(config: FeatureFlag!) {
        self.config = config
    }
    
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        
        // Create a tabBar with 3 tabs
        let tabBarController = UITabBarController()
        let firstViewController = UIViewController()
        let secondViewController = UIViewController()
        let thirdViewController = UIViewController()
        let fourthViewController = UIViewController()
        let fifthViewController = UIViewController()
        
        firstViewController.tabBarItem = UITabBarItem(tabBarSystemItem: .favorites, tag: 0)
        secondViewController.tabBarItem = UITabBarItem(tabBarSystemItem: .downloads, tag: 1)
        thirdViewController.tabBarItem = UITabBarItem(tabBarSystemItem: .more, tag: 2)
        fourthViewController.tabBarItem = UITabBarItem(tabBarSystemItem: .bookmarks, tag: 3)
        fifthViewController.tabBarItem = UITabBarItem(tabBarSystemItem: .contacts, tag: 4)
        
        var viewControllers = [firstViewController, secondViewController]
        if config.isNewFeatureEnabled {
            viewControllers.append(thirdViewController)
        } else {
            viewControllers.append(fourthViewController)
            viewControllers.append(fifthViewController)
        }
        
        tabBarController.viewControllers = viewControllers
        
        // Create a window and set the root view controller
        let window = UIWindow(frame: UIScreen.main.bounds)
        window.rootViewController = tabBarController
        window.makeKeyAndVisible()
        self.window = window
        
        return true
    }
}

在測驗中，我設定我的配置，創建一個 AppDelegate 的實體，注入配置，并通過appDelegate.application(UIApplication.shared, didFinishLaunchingWithOptions: nil)AppDelegate 的功能啟動應用程式。

let appDelegate = AppDelegate(config: config)

        // This is the key function
        _ = appDelegate.application(UIApplication.shared, didFinishLaunchingWithOptions: nil)

測驗：

import XCTest
@testable import ExampleApp


final class NewFeatureVisibilityTests: XCTestCase {
   
    func test_app_can_start_with_isNewFeatureEnabled(){
        let config = FeatureFlagService()
        config.isNewFeatureEnabled = true
        let appDelegate = AppDelegate(config: config)

        // This is the key function
        _ = appDelegate.application(UIApplication.shared, didFinishLaunchingWithOptions: nil)
        
        guard let rootVC = UIApplication.shared.currentWindow.rootViewController as? UITabBarController else {
            return XCTFail("RootViewController is nil")
        }
        
        XCTAssertEqual(rootVC.viewControllers?.count, 3)
    }
    
    func test_app_can_start_with_isNewFeatureDisabled(){
        let config = FeatureFlagService()
        config.isNewFeatureEnabled = false
        let appDelegate = AppDelegate(config: config)

        // This is the key function
        _ = appDelegate.application(UIApplication.shared, didFinishLaunchingWithOptions: nil)
        
        guard let rootVC = UIApplication.shared.currentWindow.rootViewController as? UITabBarController else {
            return XCTFail("RootViewController is nil")
        }
        
        XCTAssertEqual(rootVC.viewControllers?.count, 4)
    }
}

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