Default locales test for flutter tester. Roll engine 162b2e9..7be0217 (…

…flutter#23596)

162b2e9..7be0217
7be0217 Roll back _countryCode assert - breaking change (flutter#6693)
91a019c Fix popSystemNavigator (flutter#6691)
2b2fbf0 Add Locale.fromSubtags and support for scriptCode. (flutter#6518)
58c8e30 Roll src/third_party/skia ab18c8e6cc20..d48b7a881b24 (5 commits) (flutter#6690)
3b17cfb Flutter tester default locales (flutter#6689)
96bbd2b Roll buildroot to 11a934e99eaa4aa8e278cd2772aff4f51f1f3c41 (flutter#6687)
0e9defb Roll src/third_party/skia 68825776f4b4..ab18c8e6cc20 (11 commits) (flutter#6688)
cc686d7 Don't populate the external view embedder in PaintContext. (flutter#6686)
ab782fa Roll src/third_party/skia 1de48d8040aa..68825776f4b4 (1 commits) (flutter#6685)
c4aa8d3 Roll src/third_party/skia 797197a772b8..1de48d8040aa (2 commits) (flutter#6684)
7352251 Roll src/third_party/skia 79c96811863f..797197a772b8 (1 commits) (flutter#6683)
3dac47e Roll src/third_party/skia 38e4fd0c5654..79c96811863f (1 commits) (flutter#6682)
2f06a53 Roll src/third_party/skia b53f1f46982d..38e4fd0c5654 (1 commits) (flutter#6681)
a1d7cad Fix inconsistent include syntax (flutter#6680)
236661c Roll src/third_party/skia 3b79aa3a5ad0..b53f1f46982d (13 commits) (flutter#6679)
c4f5061 Roll buildroot to pick up Mac toolchain updates. (flutter#6678)
ba8f6aa Handle Windows headers defining ERROR to 0 in log levels. (flutter#6677)
505d2a9 Roll buildroot to pick up updates to custom toolchains. (flutter#6674)
6c2a0b3 Undefine ERROR in platform_view_layer.cc (flutter#6675)
55e1299 Update FlutterPlugin.h docs, suppress warning for older API (flutter#6672)
f797004 Attach and position embedded UIVIews (flutter#6614)
df85722 Plumb the iOS PlatformViewsController into flow. (flutter#6603)
2bfb893 iOS Embedding Refactor (flutter#6447)

bin/internal/engine.version

@@ -1 +1 @@
-162b2e98c036a8f8c355fd475dbe0db4f4bc886c
+7be0217d6796954694753647b7a757b8e3907f64

packages/flutter_localizations/test/widgets_test.dart

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+import 'dart:ui' as ui;
+
 import 'package:flutter_test/flutter_test.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/widgets.dart';
@@ -537,10 +539,8 @@ void main() {
       )
     );
 
-    // Startup time. Default test locale is null, so
-    // no supported matches. Use the first locale.
     await tester.pumpAndSettle();
-    expect(find.text('zh_CN'), findsOneWidget);
+    expect(find.text('en_GB'), findsOneWidget);
 
     // defaultLocaleChangedHandler prefers exact supported locale match
     await tester.binding.setLocale('en', 'CA');
@@ -581,8 +581,7 @@ void main() {
       )
     );
 
-    // Initial WidgetTester locale is null due to no platform intitializing it.
-    // The locale gets resolved to "en_US", which is the first supported locale.
+    // Initial WidgetTester locale is `en_US`.
     await tester.pumpAndSettle();
     expect(find.text('en_US TextDirection.ltr'), findsOneWidget);
 
@@ -623,8 +622,7 @@ void main() {
       )
     );
 
-    // Initial WidgetTester locale is null due to no platform intitializing it.
-    // The locale gets resolved to "en_US", which is the first supported locale.
+    // Initial WidgetTester locale is `en_US`.
     await tester.pumpAndSettle();
     expect(find.text('en_US TextDirection.rtl'), findsOneWidget);
 
@@ -657,8 +655,7 @@ void main() {
       )
     );
 
-    // Initial WidgetTester locale is null due to no platform intitializing it.
-    // The locale gets resolved to "en_US", which is the first supported locale.
+    // Initial WidgetTester locale is `en_US`.
     await tester.pumpAndSettle();
     expect(find.text('en_US TextDirection.rtl'), findsOneWidget);
 
@@ -675,4 +672,27 @@ void main() {
     expect(find.text('da_DA TextDirection.rtl'), findsOneWidget);
   });
 
+  // We provide <Locale>[Locale('en', 'US'), Locale('zh', 'CN')] as ui.window.locales
+  // for flutter tester so that the behavior of tests match that of production
+  // environments. Here, we test the default locales.
+  testWidgets('WidgetsApp DefaultWidgetLocalizations', (WidgetTester tester) async {
+    await tester.pumpAndSettle();
+    await tester.pumpWidget(
+      buildFrame(
+        // Accept whatever locale we're given
+        localeResolutionCallback: (Locale locale, Iterable<Locale> supportedLocales) => locale,
+        delegates: <OnlyRTLDefaultWidgetsLocalizationsDelegate>[
+          const OnlyRTLDefaultWidgetsLocalizationsDelegate(),
+        ],
+        buildContent: (BuildContext context) {
+          final Locale locale1 = ui.window.locales.first;
+          final Locale locale2 = ui.window.locales[1];
+          return Text('$locale1 $locale2');
+        }
+      )
+    );
+     // Initial WidgetTester default locales is `en_US` and `zh_CN`.
+    await tester.pumpAndSettle();
+    expect(find.text('en_US zh_CN'), findsOneWidget);
+  });
 }