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