anchor.diff:        drawer.opened = true;
   
         await wait(350);
  -      expect(document.body.style.overflow, equals('')); //TODO FIXME should be 'hidden'
  +      expect(document.body.style.overflow, equals('hidden'));
   
         drawer.persistent = true;
   
  
positive.code:       drawer.persistent = false;
  
        await wait(350);
        expect(document.body.style.overflow, equals('')); //TODO FIXME should be 'hidden'
  
        drawer.opened = false;
  
  
negative.code: 
        await wait(350);
        expect(drawer.opened, isFalse);
        expect(listenerSpy.callCount, equals(6)); //should fire after swiping beyond end state
      });
  
      test('track events block user selection', () async {
  