popoverPresentationController is always nil in iOS 11 about pivotalcorekit HOT 1 OPEN

#import <Cedar/Cedar.h>
#import "ViewController.h"

using namespace Cedar::Matchers;
using namespace Cedar::Doubles;

SPEC_BEGIN(ViewControllerSpec)

describe(@"ViewController", ^{
    __block ViewController *subject;

    beforeEach(^{
        subject = [[ViewController alloc] init];
    });

    describe(@"-viewDidLoad", ^{
        beforeEach(^{
            [subject loadViewIfNeeded];
        });
 
        it(@"should present a popover controller", ^{
            UIViewController *presentedViewController = subject.presentedViewController;
            UIPopoverPresentationController *popoverController = (UIPopoverPresentationController *)presentedViewController.presentationController;
            popoverController should_not be_nil;
        });
    });
});

SPEC_END