anchor.diff:            ..append(DeviceClass.audioRender)
             ..append(DeviceClass.imageScanner);
           final iterator = vector.first();
  -        expect(iterator.hasCurrent, true);
  +        expect(iterator.hasCurrent, isTrue);
           expect(iterator.current, equals(DeviceClass.audioCapture));
  -        expect(iterator.moveNext(), true);
  +        expect(iterator.moveNext(), isTrue);
           expect(iterator.current, equals(DeviceClass.audioRender));
  -        expect(iterator.moveNext(), true);
  +        expect(iterator.moveNext(), isTrue);
           expect(iterator.current, equals(DeviceClass.imageScanner));
  -        expect(iterator.moveNext(), false);
  +        expect(iterator.moveNext(), isFalse);
         });
   
         tearDown(() {
  
positive.code:           ..append(DeviceClass.audioCapture)
            ..append(DeviceClass.audioRender);
          final containsElement = vector.indexOf(DeviceClass.audioRender, pIndex);
          expect(containsElement, true);
          expect(pIndex.value, equals(1));
        });
  
  
negative.code:         final iterator = vectorView.first();
  
          for (var i = 0; i < list.length; i++) {
            expect(iterator.hasCurrent, isTrue);
            // Should be something like en-US
            expect(iterator.current[2], equals('-'));
            // MoveNext() should return true except for the last iteration
  