EXC_BAD_ACCESS when accessing parameters in andDo of OCMock

Question

I am trying to write an block of code using OCMock\'s stub andDo method.

In this case UIImageView extension class is being tested. I want to check that the exte

Answer 1

In my case this was happening because I introduced another parameter to this method, so the block parameter got shifted by one.

I fixed it by changing [inv getArgument:&op atIndex:2] to [inv getArgument:&op atIndex:3]

Answer 2

I think the problem is that you're trying to invoke a mock object directly. For what you're trying to do, you shouldn't need a mock object. Just call the method and verify that the image was set:

expect(myObject.imageView.image).to.beNil();
[myObject do_something_that_calls_setImage];
expect(myObject.imageView.image).not.to.beNil();

If you really want to use a mock for some reason, you could do it with a real UIImageView and a partial mock:

UIImageView *imageView = myObject.imageView;
id mockView = [OCMockObject partialMockForObject:imageView];
__block BOOL imageSet = NO;
[[[mockView stub] andDo:^(NSInvocation *invocation) {
      UIImage *img;
      [invocation getArgument:&img atIndex:2];
      imageSet = (img != nil);
  }] setImage:OCMOCK_ANY];

[myObject do_something_that_calls_setImage];
expect(imageSet).to.beTruthy();

Answer 3

I ran into a similar problem when using NSProxy's forwardInvocation: method.

Can you try the below?

NSInvocationOperation *op; // Change this line
__unsafe_unretained NSInvocationOperation *op; // to this line

Or another approach could be to retain NSInvocation's arguments:

[invocation retainArguments];

http://developer.apple.com/library/ios/documentation/Cocoa/Reference/Foundation/Classes/NSInvocation_Class/Reference/Reference.html#//apple_ref/occ/instm/NSInvocation/retainArguments

I'll try to add a more detailed explanation later.