Fix webview_flutter Android integration tests and add Espresso

packages/webview_flutter/example/android/app/build.gradle

@@ -56,7 +56,8 @@ flutter {
 
 dependencies {
     testImplementation 'junit:junit:4.12'
-    androidTestImplementation 'androidx.test:runner:1.2.0'
-    androidTestImplementation 'androidx.test:rules:1.2.0'
-    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
+    testImplementation "com.google.truth:truth:1.0"
+    androidTestImplementation 'androidx.test:runner:1.1.1'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'
+    api 'androidx.test:core:1.2.0'
 }

packages/webview_flutter/example/android/app/src/androidTestDebug/java/io/flutter/plugins/webviewflutterexample/MainActivityTest.java → packages/webview_flutter/example/android/app/src/androidTest/java/io/flutter/plugins/webviewflutterexample/MainActivityTest.java

@@ -13,5 +13,6 @@
 @RunWith(FlutterTestRunner.class)
 public class MainActivityTest {
   @Rule
-  public ActivityTestRule<FlutterActivity> rule = new ActivityTestRule<>(FlutterActivity.class);
+  public final ActivityTestRule<FlutterActivity> rule =
+      new ActivityTestRule<>(FlutterActivity.class);
 }

packages/webview_flutter/example/android/app/src/androidTest/java/io/flutter/plugins/webviewflutterexample/WebViewTest.java

@@ -0,0 +1,16 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package io.flutter.plugins.webviewflutterexample;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+
+public class WebViewTest {
+  @Test
+  public void placeHolderTest() {
+    assertEquals(1, 1);
+  }
+}

packages/webview_flutter/example/android/app/src/main/AndroidManifest.xml

@@ -9,6 +9,7 @@
   <application
     android:icon="@mipmap/ic_launcher"
     android:label="webview_flutter_example"
+    android:usesCleartextTraffic="true"
     android:name="io.flutter.app.FlutterApplication">
     <meta-data
         android:name="flutterEmbedding"

packages/webview_flutter/example/integration_test/webview_flutter_test.dart

@@ -18,7 +18,7 @@ import 'package:integration_test/integration_test.dart';
 void main() {
   IntegrationTestWidgetsFlutterBinding.ensureInitialized();
 
-  testWidgets('initalUrl', (WidgetTester tester) async {
+  testWidgets('initialUrl', (WidgetTester tester) async {
     final Completer<WebViewController> controllerCompleter =
         Completer<WebViewController>();
     await tester.pumpWidget(
@@ -532,6 +532,7 @@ void main() {
       expect(fullScreen, _webviewBool(false));
     });
 
+    // allowsInlineMediaPlayback is a noop on Android, so it is skipped.
     testWidgets(
         'Video plays full screen when allowsInlineMediaPlayback is false',
         (WidgetTester tester) async {
@@ -581,7 +582,7 @@ void main() {
       String fullScreen =
           await controller.evaluateJavascript('isFullScreen();');
       expect(fullScreen, _webviewBool(true));
-    });
+    }, skip: Platform.isAndroid);
   });
 
   group('Audio playback policy', () {
@@ -1272,18 +1273,19 @@ void main() {
       ),
     );
     final WebViewController controller = await controllerCompleter.future;
-    await controller.evaluateJavascript('window.open("about:blank", "_blank")');
+    await controller
+        .evaluateJavascript('window.open("https://flutter.dev/", "_blank")');
     await pageLoaded.future;
     final String? currentUrl = await controller.currentUrl();
-    expect(currentUrl, 'about:blank');
+    expect(currentUrl, 'https://flutter.dev/');
   });
 
   testWidgets(
     'can open new window and go back',
     (WidgetTester tester) async {
       final Completer<WebViewController> controllerCompleter =
           Completer<WebViewController>();
-      final Completer<void> pageLoaded = Completer<void>();
+      Completer<void> pageLoaded = Completer<void>();
       await tester.pumpWidget(
         Directionality(
           textDirection: TextDirection.ltr,
@@ -1301,13 +1303,20 @@ void main() {
         ),
       );
       final WebViewController controller = await controllerCompleter.future;
+      expect(controller.currentUrl(), completion('https://flutter.dev/'));
+      await pageLoaded.future;
+      pageLoaded = Completer<void>();
+
       await controller
-          .evaluateJavascript('window.open("https://www.google.com")');
+          .evaluateJavascript('window.open("https://www.google.com/")');
       await pageLoaded.future;
+      pageLoaded = Completer<void>();
       expect(controller.currentUrl(), completion('https://www.google.com/'));
 
+      expect(controller.canGoBack(), completion(true));
       await controller.goBack();
-      expect(controller.currentUrl(), completion('https://www.flutter.dev'));
+      await pageLoaded.future;
+      expect(controller.currentUrl(), completion('https://flutter.dev/'));
     },
     skip: !Platform.isAndroid,
   );

packages/webview_flutter/example/pubspec.yaml

@@ -17,6 +17,7 @@ dependencies:
     path: ../
 
 dev_dependencies:
+  espresso: ^0.1.0+2
   flutter_test:
     sdk: flutter
   flutter_driver: