// 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_test/flutter_test.dart'; import 'package:flutter/rendering.dart'; import 'package:flutter/widgets.dart'; import 'test_widgets.dart'; void main() { testWidgets('Stateful widget smoke test', (WidgetTester tester) async { void checkTree(BoxDecoration expectedDecoration) { final SingleChildRenderObjectElement element = tester.element( find.byElementPredicate((Element element) => element is SingleChildRenderObjectElement) ); expect(element, isNotNull); expect(element.renderObject, isA<RenderDecoratedBox>()); final RenderDecoratedBox renderObject = element.renderObject as RenderDecoratedBox; expect(renderObject.decoration, equals(expectedDecoration)); } await tester.pumpWidget( const FlipWidget( left: DecoratedBox(decoration: kBoxDecorationA), right: DecoratedBox(decoration: kBoxDecorationB), ), ); checkTree(kBoxDecorationA); await tester.pumpWidget( const FlipWidget( left: DecoratedBox(decoration: kBoxDecorationB), right: DecoratedBox(decoration: kBoxDecorationA), ), ); checkTree(kBoxDecorationB); flipStatefulWidget(tester); await tester.pump(); checkTree(kBoxDecorationA); await tester.pumpWidget( const FlipWidget( left: DecoratedBox(decoration: kBoxDecorationA), right: DecoratedBox(decoration: kBoxDecorationB), ), ); checkTree(kBoxDecorationB); }); testWidgets("Don't rebuild subwidgets", (WidgetTester tester) async { await tester.pumpWidget( const FlipWidget( key: Key('rebuild test'), left: TestBuildCounter(), right: DecoratedBox(decoration: kBoxDecorationB), ), ); expect(TestBuildCounter.buildCount, equals(1)); flipStatefulWidget(tester); await tester.pump(); expect(TestBuildCounter.buildCount, equals(1)); }); }