examples/api/test/widgets/transitions/size_transition.0_test.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/material.dart';
import 'package:flutter_api_samples/widgets/transitions/size_transition.0.dart' as example;
import 'package:flutter_test/flutter_test.dart';

void main() {
  testWidgets('Shows flutter logo in transition', (WidgetTester tester) async {
    await tester.pumpWidget(const example.SizeTransitionExampleApp());
    expect(find.byType(FlutterLogo), findsOneWidget);
    expect(find.byType(Center), findsOneWidget);
    expect(find.descendant(
      of: find.byType(Center),
      matching: find.byType(FlutterLogo)
    ), findsOneWidget);
    expect(find.byType(SizeTransition), findsOneWidget);

    expect(
      tester.widget(find.byType(SizeTransition)),
      isA<SizeTransition>()
        .having((SizeTransition transition) => transition.axis, 'axis', Axis.horizontal)
        .having((SizeTransition transition) => transition.axisAlignment, 'axis alignment', -1)
        .having((SizeTransition transition) => transition.sizeFactor, 'factor', isA<CurvedAnimation>()
        .having((CurvedAnimation animation) => animation.curve, 'curve', Curves.fastOutSlowIn)
        .having((CurvedAnimation animation) => animation.parent, 'paren', isA<AnimationController>()
        .having((AnimationController controller) => controller.duration, 'duration', const Duration(seconds: 3)))
      )
    );
  });
}