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Co-authored-by: Alexander Dahlberg <alexander.dahlberg@sigma.se> Fixes test/animation/animation_controller_test.dart in #85160 Problem: The test 'animateTo can deal with duration == Duration.Zero' was failing with the following error: Expected: <0> Actual: <5> Expected no animation. package:test_api expect package:flutter_test/src/widget_tester.dart 484:3 expect test/animation/animation_controller_test.dart 511:5 main. Following line finds 5 transientCallbacks scheduled, while expecting zero, if shuffled with seed 123: expect(SchedulerBinding.instance!.transientCallbackCount, equals(0), reason: 'Expected no animation.'); This is caused by some other test leaving transientCallbacks scheduled. Fix: By disposing the AnimationController after each test, the transientCallbacks get cleaned up. I chose to dispose all controllers in every test, to make sure there is no risk of leaks.