anchor.diff:      await tester.drag(find.byType(PageView62209), const Offset(800.0, 0.0));
       await tester.pump();
       expect(find.text('Page 1'), findsOneWidget);
  -    await tester.tap(find.byType(FlatButton)); // 9
  +    await tester.tap(find.byType(TextButton)); // 9
       await tester.pump();
       expect(find.text('Page 1'), findsOneWidget);
       expect(find.text('Page 9'), findsNothing);
  
positive.code:     expect(find.text('Page 4'), findsOneWidget);
      expect(find.text('Page 5'), findsNothing);
      expect(find.text('Page 100'), findsNothing);
      await tester.tap(find.byType(FlatButton)); // 8
      await tester.pump();
      expect(find.text('Page 1'), findsNothing);
      expect(find.text('Page 8'), findsNothing);
  
negative.code:     expect(find.text('Page 1'), findsNothing);
      expect(find.text('Page 5'), findsNothing);
      expect(find.text('Page 100'), findsOneWidget);
      await tester.tap(find.byType(TextButton)); // 6
      await tester.pump();
      expect(find.text('Page 1'), findsNothing);
      expect(find.text('Page 6'), findsNothing);
      expect(find.text('Page 5'), findsNothing);
      expect(find.text('Page 100'), findsOneWidget);
      await tester.tap(find.byType(TextButton)); // 7
      await tester.pump();
      expect(find.text('Page 1'), findsNothing);
      expect(find.text('Page 6'), findsNothing);
  