C & OC Mock's Goal - Bullying a Class?

Question

I need to determine if a class method has been called or not. How can I do this using OCMock?

Answer 1

Starting with OCMock 2.1, this is supported out of the box. Now you can stub class methods in the same way as stub instance methods.

Answer 2

One approach is to wrap a class method in a method of your own class. So let your class call [SomeOtherClass classMethod:someString] . You can create an invokeClassMethod: method in your class as follows:

 -(NSString *)invokeClassMethod:(NSString *)someString { return [SomeOtherClass classMethod:someString]; } 

Then, in your test, you create a partial layout and expect invokeClassMethod:

 -(void)testSomething { id partialMock = [OCMockObject partialMockForObject:actual]; [[[partialMock expect] andReturn:@"foo"] invokeClassMethod:@"bar"]; [actual doSomething:@"bar"]; [partialMock verify]; } 

If you want to verify that invokeClassMethod not called, you can throw an exception:

 -(void)testSomethingElse { id partialMock = [OCMockObject partialMockForObject:actual]; [[[partialMock stub] andThrow:[NSException exceptionWithName:@"foo" reason:@"Should not have called invokeClassMethod:" userInfo:nil] invokeClassMethod:OCMOCK_ANY]; [actual doSomething:@"bar"]; } 

Resolving will cause the test to fail if invokeClassMethod is invokeClassMethod .

Answer 3

As zneak said in his comment on your question, see this answer ,

And from the comments there, checkout this block implementation of the swizzling class method.

OCMock doesn't seem to support what you want to do, but this solution is pretty nice!

Answer 4

Alternatively, suppose you have a class:

 @interface ABCCleverClass : NSObject + (id)specialMethod; @end 

and you want to mock this class method. One option is to create a category in this class that defines and implements test support. Then you can change the implementation of the class method in the tested class to your layout from the category.

 #import <objc/runtime.h> @interface ABCCleverClass (TestSupport) + (id)mockSpecialMethod; @end @implementation ABCCleverClass (TestSupport) + (void)load { Method original = class_getClassMethod([ABCCleverClass class], @selector(specialMethod)); Method mocked = class_getClassMethod([ABCCleverClass class], @selector(mockSpecialMethod)); method_exchangeImplementations(original, mocked); } + (id)mockSpecialMethod { // Perform mock method. You may need to add more class methods // in order to configure this. } @end