Stubbing alloc to return mocked object

gistfile1.m

it(@"should start the processing with the ids from the network response", ^{
    // mock network request
    [KWSpec canResponseJSON:@"ids"];

    // execute code under test
    [client syncMyStuff];
            
    // create mock
    id process = [ProcessingOperation mock];
    // return mock by stubbing alloc
    [[ProcessingOperation shouldEventually] receive:@selector(alloc) andReturn:process];
    // setup expected arguments
    NSArray *ids = [NSArray arrayWithObjects:
                    [NSNumber numberWithInteger:2],
                    [NSNumber numberWithInteger:3],
                    nil];
    // verify initializer
    [[process shouldEventually] receive:@selector(initWithIDs:) andReturn:nil withArguments:ids];
});

Testing Framework is Kiwi: https://github.com/allending/Kiwi
Network request mocking realized with ILCannedURLProtocol.h: https://github.com/InfiniteLoopDK/ILTesting