Adds espresso testing for add_to_app/android_fullscreen (#323)

add_to_app/flutter_module/pubspec.lock

@@ -57,16 +57,40 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.1.3"
+  espresso:
+    dependency: "direct dev"
+    description:
+      name: espresso
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.0.1+2"
+  file:
+    dependency: transitive
+    description:
+      name: file
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "5.1.0"
   flutter:
     dependency: "direct main"
     description: flutter
     source: sdk
     version: "0.0.0"
+  flutter_driver:
+    dependency: "direct dev"
+    description: flutter
+    source: sdk
+    version: "0.0.0"
   flutter_test:
     dependency: "direct dev"
     description: flutter
     source: sdk
     version: "0.0.0"
+  fuchsia_remote_debug_protocol:
+    dependency: transitive
+    description: flutter
+    source: sdk
+    version: "0.0.0"
   image:
     dependency: transitive
     description:
@@ -74,6 +98,20 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.1.4"
+  intl:
+    dependency: transitive
+    description:
+      name: intl
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.16.0"
+  json_rpc_2:
+    dependency: transitive
+    description:
+      name: json_rpc_2
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.1.0"
   matcher:
     dependency: transitive
     description:
@@ -88,6 +126,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.1.8"
+  nested:
+    dependency: transitive
+    description:
+      name: nested
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.0.4"
   path:
     dependency: transitive
     description:
@@ -109,13 +154,34 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.4.0"
+  platform:
+    dependency: transitive
+    description:
+      name: platform
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.2.1"
+  process:
+    dependency: transitive
+    description:
+      name: process
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.0.12"
   provider:
     dependency: "direct main"
     description:
       name: provider
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "3.2.0"
+    version: "4.0.2"
+  pub_semver:
+    dependency: transitive
+    description:
+      name: pub_semver
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.4.2"
   quiver:
     dependency: transitive
     description:
@@ -184,6 +250,20 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.0.8"
+  vm_service_client:
+    dependency: transitive
+    description:
+      name: vm_service_client
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.2.6+2"
+  web_socket_channel:
+    dependency: transitive
+    description:
+      name: web_socket_channel
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.1.0"
   xml:
     dependency: transitive
     description:
@@ -193,3 +273,4 @@ packages:
     version: "3.5.0"
 sdks:
   dart: ">=2.6.0-dev <3.0.0"
+  flutter: ">=1.12.1 <2.0.0"

add_to_app/flutter_module/pubspec.yaml

@@ -9,11 +9,14 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
-  provider: ^3.1.0
+  provider: ^4.0.2
 
 dev_dependencies:
   flutter_test:
     sdk: flutter
+  flutter_driver:
+    sdk: flutter
+  espresso: ^0.0.1+2
 
 flutter:
   uses-material-design: true

add_to_app/flutter_module/test/widget_test.dart

@@ -1,14 +1,10 @@
-// This is a basic Flutter widget test.
-//
-// To perform an interaction with a widget in your test, use the WidgetTester
-// utility that Flutter provides. For example, you can send tap and scroll
-// gestures. You can also use WidgetTester to find child widgets in the widget
-// tree, read text, and verify that the values of widget properties are correct.
+// Copyright 2019 The Flutter team. 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_test/flutter_test.dart';
-
 import 'package:flutter_module/main.dart';
+import 'package:flutter_test/flutter_test.dart';
 import 'package:provider/provider.dart';
 
 class MockCounterModel extends ChangeNotifier implements CounterModel {

add_to_app/flutter_module/test_driver/example.dart

@@ -0,0 +1,13 @@
+// Copyright 2020 The Flutter team. 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_driver/driver_extension.dart';
+import 'package:flutter_module/main.dart' as app;
+
+// This alternate entrypoint is used for espresso testing. See
+// https://pub.dev/packages/espresso for details.
+void main() {
+  enableFlutterDriverExtension();
+  app.main();
+}