anchor.diff:    });
   
     testWidgets('drag-up with DismissDirection.up triggers dismiss', (WidgetTester tester) async {
  -    scrollDirection = Axis.horizontal;
  -    dismissDirection = DismissDirection.up;
  -
  -    await tester.pumpWidget(buildTest());
  +    await tester.pumpWidget(
  +      buildTest(
  +        scrollDirection: Axis.horizontal,
  +        dismissDirection: DismissDirection.up,
  +      ),
  +    );
       expect(dismissedItems, isEmpty);
   
       await dismissItem(tester, 0, gestureDirection: AxisDirection.down);
  
positive.code:   });
  
    testWidgets('Dismissible starts from the full size when collapsing', (WidgetTester tester) async {
      scrollDirection = Axis.vertical;
      dismissDirection = DismissDirection.horizontal;
      background = const Text('background');
  
      await tester.pumpWidget(buildTest());
      expect(dismissedItems, isEmpty);
  
      final Finder itemFinder = find.text('0');
  
negative.code:   });
  
    testWidgets('Horizontal fling less than threshold', (WidgetTester tester) async {
      await tester.pumpWidget(buildTest(scrollDirection: Axis.horizontal));
      expect(dismissedItems, isEmpty);
  
      await checkFlingItemAfterMovement(tester, 0, gestureDirection: AxisDirection.left, mechanism: rollbackElement);
  