flutter_flutter/packages/flutter/test/physics/spring_simulation_test.dart
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---------

Co-authored-by: Kate Lovett <katelovett@google.com>
Co-authored-by: LongCatIsLooong <31859944+LongCatIsLooong@users.noreply.github.com>
2024-12-19 20:06:21 +00:00

39 lines
1.1 KiB
Dart

// Copyright 2014 The Flutter 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/physics.dart';
import 'package:flutter_test/flutter_test.dart';
void main() {
test('When snapToEnd is set, value is exactly `end` after completion', () {
final SpringDescription description = SpringDescription.withDampingRatio(
mass: 1.0,
stiffness: 400,
);
const double time = 0.4;
final SpringSimulation regularSimulation = SpringSimulation(
description,
0,
1,
0,
tolerance: const Tolerance(distance: 0.1, velocity: 0.1),
);
expect(regularSimulation.x(time), lessThan(1));
expect(regularSimulation.dx(time), greaterThan(0));
final SpringSimulation snappingSimulation = SpringSimulation(
description,
0,
1,
0,
snapToEnd: true,
tolerance: const Tolerance(distance: 0.1, velocity: 0.1),
);
// Must be exactly equal
expect(snappingSimulation.x(time), 1);
expect(snappingSimulation.dx(time), 0);
});
}