anchor.diff:      tick(Duration.zero);
       tick(const Duration(seconds: 2));
       expect(statuses, <AnimationStatus>[AnimationStatus.forward]);
  +    controller.dispose();
     });
   
     test('Repeating animation with reverse: true report as forward and reverse', () {
  
positive.code:     expect(controller.velocity, 0.0);
  
      controller.stop();
    });
  
    test('Disposed AnimationController toString works', () {
  
negative.code:       expect(controller.value, 1.0);
        expect(controller.status, AnimationStatus.completed);
        debugSemanticsDisableAnimations = false;
        controller.dispose();
      });
  
      test('AnimationBehavior.normal runs at 20x speed when animatingTo', () {
  