var config = {                                              
        mongos: 2,                                          
        shards: 2,                                          
        other: {                                            
            rs: true,                                      
            mongosOptions: { binVersion: "2.8"},       
            configOptions: { binVersion: oldVersion},       
            rsOptions: {binVersion: ["2.6"], nodes:3}
        }                                                                       
    };                                                      

assert.writeError(offerChange.update({ _id: 123 },                                   
                                     { _id: 123, categoryId: 9881, store: "NEWEST" },
                                     true, false));