OCMockの引数検査 | Codetter（こーどったー）

[[mockDelegate expect] didComplete:downloader withReceivedData:[OCMArg checkWithBlock:^BOOL(id obj) {
        
        NSData* input = (NSData*)obj;
        NSData* expected = [@"abc" dataUsingEncoding:NSUTF8StringEncoding];
        
        return [input isEqualToData:expected];
}]];