How to stub a class method in OCMock?

Question

I often find in my iPhone Objective-C unit tests that I want stub out a class method, e.g. NSUrlConnection's +sendSynchronousRequest:returningResponse:error: method.

Simplified example:

- (void)testClassMock
{
    id mock = [OCMockObject mockForClass:[NSURLConnection class]];
    [[[mock stub] andReturn:nil] sendSynchronousRequest:nil returningResponse:nil error:nil];
}

When running this, I get:

Test Case '-[WorklistTest testClassMock]' started.
Unknown.m:0: error: -[WorklistTest testClassMock] : *** -[NSProxy doesNotRecognizeSelector:sendSynchronousRequest:returningResponse:error:] called!
Test Case '-[WorklistTest testClassMock]' failed (0.000 seconds).

I've had a really hard time finding any documentation on this, but I assume that class methods aren't supported by OCMock.

I found this tip after a lot of Googling. It works, but is very cumbersome: http://thom.org.uk/2009/05/09/mocking-class-methods-in-objective-c/

Is there anyway to do this within OCMock? Or can someone think of a clever OCMock category object that could be written to accomplish this sort of thing?

How to stub a class method in OCMock?

5 Answers