AdMob only sends real ads, not test ads, why?

-(void)resetAdView:(UIViewController *)rootViewController {

 currentDelegate_ = rootViewController;


if (ADloads) {
    [rootViewController.view addSubview:adBanner_];

    adBanner_.delegate = self;                                        
    adBanner_.rootViewController = rootViewController;                
    adBanner_.adUnitID = @"Unit-ID";  
    GADRequest *request = [GADRequest request];                      
    [adBanner_ loadRequest:request];                                  
    ADloads = YES;                                                  

    request.testDevices= @[ GAD_SIMULATOR_ID ]; 


} else {


    adBanner_.delegate = self;                                        
    adBanner_.rootViewController = rootViewController;                
    adBanner_.adUnitID = @"Unit-ID";   

    GADRequest *request = [GADRequest request];                       
    [adBanner_ loadRequest:request];                                  
    [rootViewController.view addSubview:adBanner_];                   
    ADloads = YES;                                                  
  request.testDevices= @[ GAD_SIMULATOR_ID ];  


}

}

Can't understand why AdMob only sends real ads and not the test ads like i'm requesting. What's wrong with the code that it only sends real ads?