anchor.diff:  import 'package:flutter/foundation.dart';
   import 'package:flutter/material.dart';
   import 'package:flutter/scheduler.dart';
  -import 'package:flutter_test/flutter_test.dart';
   import 'package:flutter_hooks/src/framework.dart';
   import 'package:flutter_hooks/src/hooks.dart';
  +import 'package:flutter_test/flutter_test.dart';
   
   import 'mock.dart';
   
  
positive.code:       expect(identical(controller, controller2), isTrue);
      });
  
      testWidgets('passes hook parameters to the PageController',
          (tester) async {
        PageController controller;
  
        await tester.pumpWidget(
  
negative.code:       expect(controller.keepPage, controller2.keepPage);
        expect(controller.viewportFraction, controller2.viewportFraction);
      });
      testWidgets("returns a PageController that doesn't change", (tester) async {
        PageController controller;
        PageController controller2;
  
  