OCMock mocking UIImagePickerController

Question

I'm trying to mock UIImagePickerController to test method from ViewController (written in Swift):

var imagePicker: UIImagePickerController!

...

func choosePhoto() {
    imagePicker = UIImagePickerController()
    imagePicker.delegate = self
    imagePicker.sourceType = .PhotoLibrary
    self.presentViewController(imagePicker, animated: true, completion: nil)
}

and the test class (written in Objective-C):

Interface:

@property (nonatomic, strong) ViewController *viewController;

Implementation:

- (void)setUp {
    [super setUp];

    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
    UINavigationController *navigationController = [storyboard instantiateInitialViewController];
    self.viewController = (ViewController *)[navigationController visibleViewController];
    self.viewController.view;
}

....

- (void)testPicker {
    id mockPicker = [OCMockObject mockForClass:[UIImagePickerController class]];
    self.viewController.imagePicker = mockPicker;

    [[mockPicker expect] setSourceType:UIImagePickerControllerSourceTypePhotoLibrary];
    [[(id)self.viewController expect] presentViewController:mockPicker animated:YES completion:nil];

    [self.viewController choosePhoto];

    [mockPicker verify];
}

The test fails, because:

OCMockObject(UIImagePickerController): expected method was not invoked: setSourceType:0

and

failed: caught "NSInvalidArgumentException", "-[MyApp.ViewController expect]: unrecognized selector sent to instance 0x....

Can anyone help me with this?

Many thanks.

score 1 · Answer 1 · answered Aug 25 '15 at 15:59

1

So, to use the expect method from OCMock, you have to have a mock of the object that is expecting a method call. In this case, you need to have a mock for self.myViewController - the ViewController class you're using doesn't have an expect method, so its getting confused. The fact that you're casting the VC to an id is masking the issue.

answered Aug 25 '15 at 15:59

bplattenburg

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1

Thanks for your answer. The mock for picker is working, but not with view controller. I did some experimentation and it turned out that it is a limitation of Swift language, because in Objective-C it verifies, that some other method was called in test method, but in Swift it is not working. – jonaszmclaren Aug 26 '15 at 07:35
Interesting - I haven't done too much with OCMock and Swift yet, so I didn't even consider that. – bplattenburg Aug 27 '15 at 15:58
@jonaszmclaren There is a lot better way to mock objects in Swift. don't need any third party libraries like OCMock – Ali Riahipour Aug 16 '16 at 05:44

OCMock mocking UIImagePickerController

1 Answers1