// 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/widgets.dart'; import 'package:flutter_test/flutter_test.dart'; import 'semantics_tester.dart'; void main() { testWidgets('can change semantics in a branch blocked by BlockSemantics', (WidgetTester tester) async { final SemanticsTester semantics = SemanticsTester(tester); final TestSemantics expectedSemantics = TestSemantics.root( children: <TestSemantics>[ TestSemantics.rootChild( id: 1, label: 'hello', textDirection: TextDirection.ltr, rect: TestSemantics.fullScreen, ), ], ); await tester.pumpWidget(buildWidget( blockedText: 'one', )); expect(semantics, hasSemantics(expectedSemantics)); // The purpose of the test is to ensure that this change does not throw. await tester.pumpWidget(buildWidget( blockedText: 'two', )); expect(semantics, hasSemantics(expectedSemantics)); // Ensure that the previously blocked semantics end up in the tree correctly when unblocked. await tester.pumpWidget(buildWidget( blockedText: 'two', blocking: false, )); expect(semantics, includesNodeWith(label: 'two', textDirection: TextDirection.ltr)); semantics.dispose(); }); } Widget buildWidget({ required String blockedText, bool blocking = true }) { assert(blockedText != null); return Directionality( textDirection: TextDirection.ltr, child: Stack( fit: StackFit.expand, children: <Widget>[ Semantics( container: true, child: ListView( children: <Widget>[ Text(blockedText), ], ), ), BlockSemantics( blocking: blocking, child: Semantics( label: 'hello', container: true, ), ), ], ), ); }