無法模擬NSUserDefaults

Question

我似乎無法模擬NSUserDefaults。我希望它發回我也告訴它的數據，但是它會從運行應用程序時發回存儲在其中的數據。

我使用：

• Specta
• Expecta
• OCMockito

我有以下測試：

describe(@"AppDelegate", ^{ 
    __block AppDelegate *appDelegate; 

    beforeEach(^{ 
     appDelegate = [AppDelegate new]; 
    }); 

    afterEach(^{ 
     appDelegate = nil; 
    }); 

    describe(@"application did finish launching with options", ^{ 
     beforeEach(^{ 
      [appDelegate application:nil didFinishLaunchingWithOptions:nil]; 

      NSUserDefaults *mockUserDefaults = mock([NSUserDefaults class]); 
      [given([mockUserDefaults objectForKey:@"currentUser"]) willReturn:nil]; 

     }); 

     it(@"should have a login view controller as root view controller", ^{ 
      expect(appDelegate.window.rootViewController).to.beKindOf([ToALoginViewController class]); 
     }); 
    }); 
}); 

所以上面測試失敗，因爲它實際上返回currentUser的一些數據。我究竟做錯了什麼？

---

從什麼關健之後說，我做了以下修改：

AppDelegate.h

@property (strong, nonatomic) NSUserDefaults *userDefaults; 

- (void)setUserDefaults:(NSUserDefaults *)userDefaults; 

AppDelegate.m

- (void)setUserDefaults:(NSUserDefaults *)userDefaults { 
    _userDefaults = userDefaults; 
} 

AppDelegateSpec.m

beforeEach(^{ 
    [appDelegate application:nil didFinishLaunchingWithOptions:nil]; 

    NSUserDefaults *mockUserDefaults = mock([NSUserDefaults class]); 
    [appDelegate setUserDefaults:mockUserDefaults]; 
    [given([mockUserDefaults objectForKey:@"currentUser"]) willReturn:nil]; 

}); 

但是，我仍然得到了同樣的問題。

Answer 1

您必須的appDelegate這是實際用戶的默認值，而不是你的模擬使用[NSUserDefaults standardUserDefaults]。

一個解決方案是讓用戶默認的應用程序委託的財產，並與您mockUserDefaults在測試中進行設置。

另一個是在您的測試中調試[NSUserDefaults standardUserDefaults]以返回您的mockUserDefaults。

Answer 2

所以非常感謝Ken Kuan，我設法解決了我遇到的問題。下面我是如何實現它的。

我添加了一個NSUserDefaults屬性的AppDelegate和setter函數。

我將self.userDefaults設置爲[NSUserDefaults standardUserDefaults],application:willFinishLaunchingWithOptions:。

我再application:didFinishLaunchingWithOptions:

設置rootViewController AppDelegate.h

@property (strong, nonatomic) NSUserDefaults *userDefaults; 

- (void)setUserDefaults:(NSUserDefaults *)userDefaults; 

AppDelegate中。米

- (BOOL)application:(UIApplication *)application willFinishLaunchingWithOptions:(NSDictionary *)launchOptions 
{ 
    self.userDefaults = [NSUserDefaults standardUserDefaults]; 

    return YES; 
} 

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { 
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; 

    NSData *encodedUserData = [self.userDefaults objectForKey:@"currentUser"]; 
    if (encodedUserData) { 
     NSLog(@"Have current user"); 
     self.window.rootViewController = [ThermostatViewController new]; 
    } else { 
     NSLog(@"No current user"); 
     self.window.rootViewController = [ToALoginViewController new]; 
    } 

    [self.window makeKeyAndVisible]; 

    return YES; 
} 

- (void)setUserDefaults:(NSUserDefaults *)userDefaults { 
    _userDefaults = userDefaults; 
} 

AppDelegateSpec.m

describe(@"application will finish launching with options", ^{ 
    beforeEach(^{ 
     [appDelegate application:nil willFinishLaunchingWithOptions:nil]; 
    }); 

    context(@"application did finish launching with options and with no current user", ^{ 
     beforeEach(^{ 
      NSUserDefaults *mockUserDefaults = mock([NSUserDefaults class]); 
      [appDelegate setUserDefaults:mockUserDefaults]; 
      [given([mockUserDefaults objectForKey:@"currentUser"]) willReturn:nil]; 

      [appDelegate application:nil didFinishLaunchingWithOptions:nil]; 
     }); 

     it(@"should have a login view controller as root view controller", ^{ 
      expect(appDelegate.window.rootViewController).to.beKindOf([ToALoginViewController class]); 
     }); 
    }); 
}); 

Answer 3

你可以嘲笑NSUserDefaults。我有這個代碼工作正常。 當你嘲笑NSUserdefaults時，確保你在測試用例結束時停止模擬，否則會在你使用NSUserDefaults的其他地方導致錯誤。

id userDefaultsMock = OCMClassMock([NSUserDefaults class]); 

OCMStub([userDefaultsMock standardUserDefaults]).andReturn(userDefaultsMock); 

OCMStub([[userDefaultsMock standardUserDefaults] boolForKey:SHOWMYNAME]).andReturn(@"N"); 

[self.myObject codewithuserdefaults]; 

OCMVerify([[NSUserDefaults standardUserDefaults] setValue:[OCMArg any] forKey:FIRSTNAME]); 

[userDefaultsMock stopMocking];