无法模拟NSUserDefaults

Question

我似乎无法嘲笑NSUserDefaults。我希望它也能把我告诉它的数据发回，但是在运行应用程序时，它会将存储在其中的数据发回。

我正在使用：

• Specta
• Expecta
• OCMockito

我有以下测试：

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]);
        });
    });
});

所以上面的测试失败了，因为它实际上返回了currentUser的一些数据。我做错了什么？

根据关健的话，我做了以下的修改：

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];

});

然而，我还是遇到了同样的问题。

Answer 1

你可以嘲笑NSUserDefaults。我有这个代码，很好用。当您在模拟NSUserdefaults时，请确保在测试用例结束时停止模拟，否则将在您使用NSUserDefaults的其他地方导致错误。

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];

Answer 2

因此，非常感谢关健，我设法解决了我的问题。以下是我是如何做到的。

我向NSUserDefaults和setter函数中添加了一个AppDelegate属性。

我将self.userDefaults设置为[NSUserDefaults standardUserDefaults] in application:willFinishLaunchingWithOptions:。

然后，我将rootViewController设置为application:didFinishLaunchingWithOptions:

AppDelegate.h

@property (strong, nonatomic) NSUserDefaults *userDefaults;

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

AppDelegate.m

- (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]);
        });
    });
});