anchor.diff:        });
   
         testWidgets('persistent_bottom_sheet_demo $themeName', (WidgetTester tester) async {
  +        final AutomatedTestWidgetsFlutterBinding binding = tester.binding;
  +        binding.addTime(const Duration(seconds: 3));
           final SemanticsHandle handle = tester.ensureSemantics();
           await tester.pumpWidget(MaterialApp(theme: theme, home: PersistentBottomSheetDemo()));
           await expectLater(tester, meetsGuideline(textContrastGuideline));
  
positive.code:       });
  
        testWidgets('text_form_field_demo $themeName', (WidgetTester tester) async {
          final SemanticsHandle handle = tester.ensureSemantics();
          await tester.pumpWidget(MaterialApp(theme: theme, home: const TextFormFieldDemo()));
          await expectLater(tester, meetsGuideline(textContrastGuideline));
  
negative.code:       });
  
        testWidgets('icons_demo $themeName', (WidgetTester tester) async {
          final AutomatedTestWidgetsFlutterBinding binding = tester.binding;
          binding.addTime(const Duration(seconds: 3));
          final SemanticsHandle handle = tester.ensureSemantics();
          await tester.pumpWidget(MaterialApp(theme: theme, home: IconsDemo()));
          await expectLater(tester, meetsGuideline(textContrastGuideline));
  