Test AboutDrawerItem (#7453)

Also, fix a few minor bugs found by the test.

packages/flutter/lib/src/foundation/licenses.dart

@@ -286,4 +286,4 @@ class LicenseRegistry {
     for (LicenseEntryCollector collector in _collectors)
       yield* collector();
   }
-}
+}
\ No newline at end of file

packages/flutter/lib/src/material/about.dart

@@ -379,6 +379,8 @@ class _LicensePageState extends State<LicensePage> {
 
   Future<Null> _initLicenses() async {
     await for (LicenseEntry license in LicenseRegistry.licenses) {
+      if (!mounted)
+        return;
       setState(() {
         _licenses.add(new Padding(
           padding: const EdgeInsets.symmetric(vertical: 18.0),

packages/flutter/lib/src/material/drawer.dart

@@ -133,10 +133,7 @@ class DrawerControllerState extends State<DrawerController> with SingleTickerPro
   @override
   void dispose() {
     _historyEntry?.remove();
-    _controller
-      ..removeListener(_animationChanged)
-      ..removeStatusListener(_animationStatusChanged)
-      ..stop();
+    _controller.dispose();
     super.dispose();
   }
 

packages/flutter/test/material/about_test.dart

+// Copyright 2016 The Chromium 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 'dart:async';
+
+import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  testWidgets('AboutDrawerItem control test', (WidgetTester tester) async {
+    await tester.pumpWidget(
+      new MaterialApp(
+        title: 'Pirate app',
+        home: new Scaffold(
+          appBar: new AppBar(
+            title: new Text('Home'),
+          ),
+          drawer: new Drawer(
+            child: new Block(
+              children: <Widget>[
+                new AboutDrawerItem(
+                  applicationVersion: '0.1.2',
+                  applicationIcon: new FlutterLogo(),
+                  applicationLegalese: 'I am the very model of a modern major general.',
+                  aboutBoxChildren: <Widget>[
+                    new Text('About box'),
+                  ]
+                ),
+              ],
+            ),
+          ),
+        ),
+      ),
+    );
+
+    expect(find.text('About Pirate app'), findsNothing);
+    expect(find.text('0.1.2'), findsNothing);
+    expect(find.text('About box'), findsNothing);
+
+    await tester.tap(find.byType(IconButton));
+    await tester.pumpUntilNoTransientCallbacks(const Duration(milliseconds: 100));
+
+    expect(find.text('About Pirate app'), findsOneWidget);
+    expect(find.text('0.1.2'), findsNothing);
+    expect(find.text('About box'), findsNothing);
+
+    await tester.tap(find.text('About Pirate app'));
+    await tester.pumpUntilNoTransientCallbacks(const Duration(milliseconds: 100));
+
+    expect(find.text('About Pirate app'), findsOneWidget);
+    expect(find.text('0.1.2'), findsOneWidget);
+    expect(find.text('About box'), findsOneWidget);
+
+    LicenseRegistry.addLicense(() {
+      return new Stream<LicenseEntry>.fromIterable(<LicenseEntry>[
+        new LicenseEntryWithLineBreaks(<String>[ 'Pirate package '], 'Pirate license')
+      ]);
+    });
+
+    await tester.tap(find.text('VIEW LICENSES'));
+    await tester.pumpUntilNoTransientCallbacks(const Duration(milliseconds: 100));
+
+    expect(find.text('Pirate license'), findsOneWidget);
+  });
+
+  testWidgets('AboutDrawerItem control test', (WidgetTester tester) async {
+    List<String> log = <String>[];
+
+    Future<Null> licenseFuture;
+    LicenseRegistry.addLicense(() {
+      log.add('license1');
+      licenseFuture = tester.pumpWidget(new Container());
+      return new Stream<LicenseEntry>.fromIterable(<LicenseEntry>[]);
+    });
+
+    LicenseRegistry.addLicense(() {
+      log.add('license2');
+      return new Stream<LicenseEntry>.fromIterable(<LicenseEntry>[
+        new LicenseEntryWithLineBreaks(<String>[ 'Another package '], 'Another license')
+      ]);
+    });
+
+    await tester.pumpWidget(new Center(
+      child: new LicensePage()
+    ));
+
+    expect(licenseFuture, isNotNull);
+    await licenseFuture;
+
+    // We should not hit an exception here.
+    await tester.idle();
+
+    expect(log, equals(<String>['license1', 'license2']));
+  });
+}

packages/flutter_test/lib/src/binding.dart

@@ -11,7 +11,6 @@ import 'package:flutter/gestures.dart';
 import 'package:flutter/http.dart' as http;
 import 'package:flutter/rendering.dart';
 import 'package:flutter/scheduler.dart';
-import 'package:flutter/services.dart';
 import 'package:flutter/widgets.dart';
 import 'package:meta/meta.dart';
 import 'package:quiver/testing/async.dart';
@@ -84,8 +83,8 @@ const Size _kDefaultTestViewportSize = const Size(800.0, 600.0);
 abstract class TestWidgetsFlutterBinding extends BindingBase
   with SchedulerBinding,
        GestureBinding,
-       ServicesBinding,
        RendererBinding,
+       // Services binding omitted to avoid dragging in the licenses code.
        WidgetsBinding {
   /// Creates and initializes the binding. This function is
   /// idempotent; calling it a second time will just return the

packages/flutter_test/lib/src/widget_tester.dart

@@ -8,7 +8,6 @@ import 'package:flutter/gestures.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter/scheduler.dart';
 import 'package:flutter/widgets.dart';
-import 'package:meta/meta.dart';
 import 'package:test/test.dart' as test_package;
 
 import 'all_elements.dart';
@@ -213,10 +212,10 @@ class WidgetTester extends WidgetController implements HitTestDispatcher, Ticker
   ///
   /// Alternatively, one can check that the return value from this function
   /// matches the expected number of pumps.
-  Future<int> pumpUntilNoTransientCallbacks([
-    @required Duration duration,
-    EnginePhase phase = EnginePhase.sendSemanticsTree
-  ]) {
+  Future<int> pumpUntilNoTransientCallbacks(
+    Duration duration, [
+      EnginePhase phase = EnginePhase.sendSemanticsTree
+    ]) {
     assert(duration != null);
     assert(duration > Duration.ZERO);
     int count = 0;