单元测试不要调用viewDidAppear方法

Question

I am using Specta to create some tests but I don't seem to be able to get this basic one to pass. The app itself works fine but this test won't pass.

ViewController

- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];
    [self showLogin];
}

- (void)showLogin
{
    [self presentViewController:[ETLoginVC new] animated:NO completion:nil];
    NSLog(@"PresentedVC: %@", [self.presentedViewController class]);
}

This logs: PresentedVC: ETLoginVC

Specs

#import "Specs.h"

#import "ETLoadingVC.h"
#import "ETLoginVC.h"

SpecBegin(ETLoadingVCSpec)

describe(@"ETLoadingVC", ^{
    __block ETLoadingVC *loadingVC;

    beforeEach(^{
        loadingVC = [[ETLoadingVC alloc] initWithUserDefaults:nil];
    });

    afterEach(^{
        loadingVC = nil;
    });

    describe(@"no current user present", ^{
        it(@"should have a login view controller as the presented view controller", ^{
            expect(loadingVC.presentedViewController).to.beKindOf([ETLoginVC class]);
        });
    });
});

SpecEnd

This fails with: the actual value is nil/null

I've tried calling:

[loadingVC view]

I've even initiated a UIWindow and an appDelegate but I just can't get it working.

My view controller is all written in code. No storyboards or nibs.

---

UPDATE

For now i've added an NSString property that gets updated with the class name that is about to be presented. I then check this string in my test. To get this working though, I had to change my beforeEach block to the following:

beforeEach(^{
    loadingVC = [[ETLoadingVC alloc] initWithUserDefaults:nil];
    [loadingVC viewDidAppear:NO];
});

Although the test passes, I get the following message:

Warning: Attempt to present <ETLoginVC: 0x7fcf34961940> on <ETLoadingVC: 0x7fcf34961280> whose view is not in the window hierarchy!

I get that this is because i'm calling viewDidAppear before the current view has finished appearing. What I don't get is how I can test this a better way.

I also don't understand why loadingVC.presentedViewController still equals nil even with this updated beforeEach block.

---

UPDATE 2

Changing the beforeEach to the below got rid of the warning message and now the presentedViewController is set correctly.

beforeEach(^{
    mockUserDefaults = mock([NSUserDefaults class]);
    loadingVC = [[ETLoadingVC alloc] initWithUserDefaults:mockUserDefaults];

    window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    window.rootViewController = loadingVC;
    [window makeKeyAndVisible];

    [loadingVC viewDidAppear:NO];
});

Answer 1

Changing the beforeEach to the following seemed to solve my problem.

beforeEach(^{
    mockUserDefaults = mock([NSUserDefaults class]);
    loadingVC = [[ETLoadingVC alloc] initWithUserDefaults:mockUserDefaults];

    window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    window.rootViewController = loadingVC;
    [window makeKeyAndVisible];

    [loadingVC viewDidAppear:NO];
});

Answer 2

Unit tests are more useful for testing objects and logic. You might want to look into integration testing, which is used to simulate actual UI behaviors. KIF is a framework that has been used a lot and is built on top of XCTest: http://www.raywenderlich.com/61419/ios-ui-testing-with-kif

Everything is written inside xcode so you don't need any extra setup (unless you want to do continuous testing).