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This PR contributes to https://github.com/flutter/flutter/issues/130459 ### Description - Updates `examples/api/lib/material/tab_controller/tab_controller.1.dart` to properly remove the listener from the `TabController` - Adds tests for `examples/api/lib/material/tab_controller/tab_controller.1.dart`
97 lines
2.9 KiB
Dart
97 lines
2.9 KiB
Dart
// Copyright 2014 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'package:flutter/foundation.dart';
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import 'package:flutter/material.dart';
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import 'package:flutter_api_samples/material/tab_controller/tab_controller.1.dart'
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as example;
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import 'package:flutter_test/flutter_test.dart';
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void main() {
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testWidgets('Verify first tab is selected by default', (WidgetTester tester) async {
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await tester.pumpWidget(
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const example.TabControllerExampleApp(),
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);
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final Tab firstTab = example.TabControllerExampleApp.tabs.first;
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expect(
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find.descendant(
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of: find.byType(TabBarView),
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matching: find.text('${firstTab.text} Tab'),
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),
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findsOneWidget,
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);
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});
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testWidgets('Verify tabs can be changed', (WidgetTester tester) async {
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final List<String?> log = <String?>[];
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final DebugPrintCallback originalDebugPrint = debugPrint;
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debugPrint = (String? message, {int? wrapWidth}) {
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log.add(message);
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};
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await tester.pumpWidget(
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const example.TabControllerExampleApp(),
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);
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const List<Tab> tabs = example.TabControllerExampleApp.tabs;
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final List<Tab> tabsTraversalOrder = <Tab>[];
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// The traverse order is from the second tab from the start to the last,
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// and then from the second tab from the end to the first.
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tabsTraversalOrder.addAll(tabs.skip(1));
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tabsTraversalOrder.addAll(tabs.reversed.skip(1));
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for (final Tab tab in tabsTraversalOrder) {
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// Tap on the TabBar's tab to select it.
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await tester.tap(find.descendant(
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of: find.byType(TabBar),
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matching: find.text(tab.text!),
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));
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await tester.pumpAndSettle();
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expect(
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find.descendant(
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of: find.byType(TabBarView),
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matching: find.text('${tab.text} Tab'),
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),
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findsOneWidget,
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);
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expect(log.length, equals(1));
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expect(log.last, equals('tab changed: ${tabs.indexOf(tab)}'));
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log.clear();
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}
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debugPrint = originalDebugPrint;
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});
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testWidgets('DefaultTabControllerListener throws when no DefaultTabController above', (WidgetTester tester) async {
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await tester.pumpWidget(
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example.DefaultTabControllerListener(
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onTabChanged: (_) {},
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child: const SizedBox.shrink(),
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),
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);
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final dynamic exception = tester.takeException();
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expect(exception, isFlutterError);
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final FlutterError error = exception as FlutterError;
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expect(
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error.toStringDeep(),
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equalsIgnoringHashCodes(
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'FlutterError\n'
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' No DefaultTabController for DefaultTabControllerListener.\n'
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' When creating a DefaultTabControllerListener, you must ensure\n'
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' that there is a DefaultTabController above the\n'
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' DefaultTabControllerListener.\n',
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),
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);
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});
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}
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