examples/api/test/widgets/transitions/rotation_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/rotation_transition.0.dart' as example;
import 'package:flutter_test/flutter_test.dart';

void main() {
  testWidgets('Shows flutter logo in rotation transition', (WidgetTester tester) async {
    await tester.pumpWidget(const example.RotationTransitionExampleApp());
    expect(
      find.byWidgetPredicate((Widget widget) => widget is RotationTransition
        && widget.turns is CurvedAnimation
        && (widget.turns as CurvedAnimation).curve == Curves.elasticOut,
      ), findsOneWidget);
    expect(find.byType(FlutterLogo), findsOneWidget);
    expect(find.byType(Padding), findsAtLeast(1));
    expect(
      find.descendant(
        of: find.byType(Center),
        matching: find.byType(FlutterLogo)
      ),
      findsOneWidget,
    );

    expect(
      find.byWidgetPredicate((Widget widget) => widget is RotationTransition
        && widget.turns is CurvedAnimation
        && widget.turns.value == 0.0
        && widget.turns.status == AnimationStatus.forward
      ), findsOneWidget);

    await tester.pump();
    await tester.pump(const Duration(seconds: 3));
    await tester.pump();

    expect(
      find.byWidgetPredicate((Widget widget) => widget is RotationTransition
        && widget.turns is CurvedAnimation
        && (widget.turns as CurvedAnimation).parent is AnimationController
        && ((widget.turns as CurvedAnimation).parent as AnimationController).value == 0.5
        && widget.turns.status == AnimationStatus.reverse
      ), findsOneWidget);
  });
}