如何对didFinishLaunchingWithOptions进行单元测试？

Question

我关注的是格雷厄姆·李（Graham Lee）撰写的《测试驱动的iOS开发》一书，并偶然发现了这一部分，而这一部分并没有得到很好的解释。 这个想法不是要在didFinishLaunchingWithOptions实例化UIWindow ，而是使用IBOutlet并将其挂钩到UIWindow xib文件。 我无法正常工作，也无法在互联网上找到任何示例。

-(void)testWindowHasRootNavigationControllerAfterApplicationLaunch
{
    XCTAssertEqualObjects(window.rootViewController, navigationController, @"App delegate's navigation controller should be the root VC");
}

@implementation iTagNewsAppDelegateTests
{
    UIWindow *window;
    UINavigationController *navigationController;
    AppDelegate *appDelegate;
}

- (void)setUp {
    window = [UIWindow new];
    navigationController = [UINavigationController new];
    appDelegate = [AppDelegate new];
    appDelegate.window = window;
    appDelegate.navigationController = navigationController;
}

码：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
BrowseOverflowViewController *firstViewController =
[[BrowseOverflowViewController alloc] initWithNibName: nil bundle: nil];
    TopicTableDataSource *dataSource = [[TopicTableDataSource alloc]
        init];
    [dataSource setTopics: [self topics]];
    firstViewController.dataSource = dataSource;
    self.navigationController.viewControllers =
        [NSArray arrayWithObject: firstViewController];
    self.window.rootViewController = self.navigationController;
    [self.window makeKeyAndVisible];
    return YES;
}

@interface BrowseOverflowAppDelegate : NSObject <UIApplicationDelegate> 
@property (nonatomic, retain) IBOutlet UIWindow *window;  
@property (nonatomic, retain) IBOutlet UINavigationController *navigationController;
@end

他的完整项目在GitHub上。 有任何教程如何定义自定义UIWindow吗？ 非常感谢

Answer 1

我没有看过那本书，但是发现我能够测试AppDelegate的完整实例。 使其适应您的代码：

- (void) setUp {
    //Could also use [[UIApplication sharedApplication] delegate] but I'm worried state may persist
    iTagNewsAppDelegate* appDelegate = [[iTagNewsAppDelegate alloc] init]
    [appDelegate application:[UIApplication sharedApplication] didFinishLaunchingWithOptions:nil]; //Couldn't find a better option than sharedApplication here, fine if application param isn't used?
    //the rest of your setup here
}

这在我的项目中有效，但是我不确定使用sharedApplication的副作用。 您希望单元测试具有已知的开始状态，并且在整个测试中重用正在运行的应用程序通常是一件坏事。