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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'package:flutter_test/flutter_test.dart';
import 'package:flutter/animation.dart';
import 'package:flutter/widgets.dart';
void main() {
setUp(() {
WidgetsFlutterBinding.ensureInitialized();
WidgetsBinding.instance.resetEpoch();
});
test('AnimationController with mutating listener', () {
final AnimationController controller = AnimationController(
duration: const Duration(milliseconds: 100),
vsync: const TestVSync(),
);
final List<String> log = <String>[];
final VoidCallback listener1 = () { log.add('listener1'); };
final VoidCallback listener3 = () { log.add('listener3'); };
final VoidCallback listener4 = () { log.add('listener4'); };
final VoidCallback listener2 = () {
log.add('listener2');
controller.removeListener(listener1);
controller.removeListener(listener3);
controller.addListener(listener4);
};
controller.addListener(listener1);
controller.addListener(listener2);
controller.addListener(listener3);
controller.value = 0.2;
expect(log, <String>['listener1', 'listener2']);
log.clear();
controller.value = 0.3;
expect(log, <String>['listener2', 'listener4']);
log.clear();
controller.value = 0.4;
expect(log, <String>['listener2', 'listener4', 'listener4']);
log.clear();
});
test('AnimationController with mutating status listener', () {
final AnimationController controller = AnimationController(
duration: const Duration(milliseconds: 100),
vsync: const TestVSync(),
);
final List<String> log = <String>[];
final AnimationStatusListener listener1 = (AnimationStatus status) { log.add('listener1'); };
final AnimationStatusListener listener3 = (AnimationStatus status) { log.add('listener3'); };
final AnimationStatusListener listener4 = (AnimationStatus status) { log.add('listener4'); };
final AnimationStatusListener listener2 = (AnimationStatus status) {
log.add('listener2');
controller.removeStatusListener(listener1);
controller.removeStatusListener(listener3);
controller.addStatusListener(listener4);
};
controller.addStatusListener(listener1);
controller.addStatusListener(listener2);
controller.addStatusListener(listener3);
controller.forward();
expect(log, <String>['listener1', 'listener2']);
log.clear();
controller.reverse();
expect(log, <String>['listener2', 'listener4']);
log.clear();
controller.forward();
expect(log, <String>['listener2', 'listener4', 'listener4']);
log.clear();
controller.dispose();
});
testWidgets('AnimationController with throwing listener', (WidgetTester tester) async {
final AnimationController controller = AnimationController(
duration: const Duration(milliseconds: 100),
vsync: const TestVSync(),
);
final List<String> log = <String>[];
final VoidCallback listener1 = () { log.add('listener1'); };
final VoidCallback badListener = () { log.add('badListener'); throw null; };
final VoidCallback listener2 = () { log.add('listener2'); };
controller.addListener(listener1);
controller.addListener(badListener);
controller.addListener(listener2);
controller.value = 0.2;
expect(log, <String>['listener1', 'badListener', 'listener2']);
expect(tester.takeException(), isNullThrownError);
log.clear();
});
testWidgets('AnimationController with throwing status listener', (WidgetTester tester) async {
final AnimationController controller = AnimationController(
duration: const Duration(milliseconds: 100),
vsync: const TestVSync(),
);
final List<String> log = <String>[];
final AnimationStatusListener listener1 = (AnimationStatus status) { log.add('listener1'); };
final AnimationStatusListener badListener = (AnimationStatus status) { log.add('badListener'); throw null; };
final AnimationStatusListener listener2 = (AnimationStatus status) { log.add('listener2'); };
controller.addStatusListener(listener1);
controller.addStatusListener(badListener);
controller.addStatusListener(listener2);
controller.forward();
expect(log, <String>['listener1', 'badListener', 'listener2']);
expect(tester.takeException(), isNullThrownError);
log.clear();
controller.dispose();
});
}