OCMock: Handling Boolean Return Types with NSValue

Ivan Moscoso, Monday, January 19, 2009 @ 12:35 am

Testing your iPhone application, you may at some point in time need to stub a method call whose return type is a boolean (or some scalar value, or C based structure). The way to implement this (as described in a discussion on CocoaDev here) is to wrap the boolean in an NSValue using the OCMOCK_VALUE() macro defined in OCMockRecorder.h.

While this solution technically works, I find that doing this within the test class itself makes the test cases a little less readable along the way. Instead, I found it useful to extend OCMock to do this type of conversion for me, keeping my test code a bit cleaner as a result.

Let's take a look at an example by examining the set up for a simple test case..

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iphone/mobile

iPhone SDK: Testing UIApplicationDelegate with OCMock

Ivan Moscoso, Thursday, January 1, 2009 @ 2:12 pm

As I have discussed earlier, you can go very, very far in unit testing your view controllers using the following recipe, without the need to bend over backwards or employ any mocking frameworks:

1. Initialize the view controller in your setup using initWithNibName:bundle:.
2. Force the view to initialize by invoking the controller's loadView method within your setUp method.
3. Write tests to assert dependencies or behavior.

This works well enough for view controllers, but when it comes time to test your application delegate, this simple approach can begin to break down. Unlike UIViewController, your application delegate is only initialized as a by-product of loading the NIB. Thus, to get this code under test I find OCMock particularly useful.

I show an example unit test below, and discuss how I approached the problem..

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software development