Provide a way to override global InheritedWidgets (#14348)
For example, so that the gallery can override the media query globally.
diff --git a/packages/flutter/test/material/app_builder_test.dart b/packages/flutter/test/material/app_builder_test.dart
new file mode 100644
index 0000000..e4cb5e3
--- /dev/null
+++ b/packages/flutter/test/material/app_builder_test.dart
@@ -0,0 +1,65 @@
+// Copyright 2018 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 'package:flutter_test/flutter_test.dart';
+import 'package:flutter/material.dart';
+
+void main() {
+ testWidgets('builder doesn\'t get called if app doesn\'t change', (WidgetTester tester) async {
+ final List<String> log = <String>[];
+ final Widget app = new MaterialApp(
+ theme: new ThemeData(
+ primarySwatch: Colors.green,
+ ),
+ home: const Placeholder(),
+ builder: (BuildContext context, Widget child) {
+ log.add('build');
+ expect(Theme.of(context).primaryColor, Colors.green.shade500);
+ expect(Directionality.of(context), TextDirection.ltr);
+ expect(child, const isInstanceOf<Navigator>());
+ return const Placeholder();
+ },
+ );
+ await tester.pumpWidget(
+ new Directionality(
+ textDirection: TextDirection.rtl,
+ child: app,
+ ),
+ );
+ expect(log, <String>['build']);
+ await tester.pumpWidget(
+ new Directionality(
+ textDirection: TextDirection.ltr,
+ child: app,
+ ),
+ );
+ expect(log, <String>['build']);
+ });
+
+ testWidgets('builder doesn\'t get called if app doesn\'t change', (WidgetTester tester) async {
+ final List<String> log = <String>[];
+ await tester.pumpWidget(
+ new MaterialApp(
+ theme: new ThemeData(
+ primarySwatch: Colors.yellow,
+ ),
+ home: new Builder(
+ builder: (BuildContext context) {
+ log.add('build');
+ expect(Theme.of(context).primaryColor, Colors.yellow.shade500);
+ expect(Directionality.of(context), TextDirection.rtl);
+ return const Placeholder();
+ },
+ ),
+ builder: (BuildContext context, Widget child) {
+ return new Directionality(
+ textDirection: TextDirection.rtl,
+ child: child,
+ );
+ },
+ ),
+ );
+ expect(log, <String>['build']);
+ });
+}
