rkmappingtest

I'm using RestKit ~> 0.20.3 and RestKit/Testing ~> 0.20.3. So this is an example of my mapping: RKObjectMapping *mapping = [RKObjectMapping mappingForClass:[PlayerVO class]]; [mapping addAttributeMappingsFromArray:@[@"firstName", @"middeName", @"lastName", @"dob", @"sex"]]; This is my mock data: NSDictionary *data = @{@"players": @[@{@"firstName": @"Ahmed", @"middleName": @"Ahmed", @"lastName": @"Ahmed", @"dob": @"100", @"sex": @"m"}]}; This is my mappingTest : RKMappingTest *mappingTest = [RKMappingTest testForMapping:mapping sourceObject:data destinationObject:nil]; And finally my