[Espresso] Create integration test and remove exemption (flutter#3367)

[Espresso] Create integration test and remove exemption

Author: reidbaker

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

@@ -26,19 +26,20 @@ apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
     compileSdkVersion flutter.compileSdkVersion
+    // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
+    namespace "com.example.espresso_example"
 
     lintOptions {
         disable 'InvalidPackage'
     }
 
     defaultConfig {
-        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
-        applicationId "com.example.espresso_example"
         minSdkVersion 16
         targetSdkVersion 29
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+        multiDexEnabled true
     }
 
     buildTypes {
@@ -56,15 +57,15 @@ flutter {
 
 dependencies {
     testImplementation 'junit:junit:4.13.2'
-    testImplementation "com.google.truth:truth:1.1.3"
-    androidTestImplementation 'androidx.test:runner:1.1.1'
-    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'
+
+    // Multidex
+    implementation "androidx.multidex:multidex:2.0.1"
 
     // Core library
     api 'androidx.test:core:1.2.0'
 
     // AndroidJUnitRunner and JUnit Rules
-    androidTestImplementation 'androidx.test:runner:1.1.0'
+    androidTestImplementation 'androidx.test:runner:1.2.0'
     androidTestImplementation 'androidx.test:rules:1.1.0'
 
     // Assertions

packages/espresso/example/android/app/src/androidTest/java/com/example/MainActivityTest.java

@@ -0,0 +1,19 @@
+// 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 com.example.espresso_example;
+
+import androidx.test.rule.ActivityTestRule;
+import dev.flutter.plugins.integration_test.FlutterTestRunner;
+import io.flutter.plugins.DartIntegrationTest;
+import org.junit.Rule;
+import org.junit.runner.RunWith;
+
+@DartIntegrationTest
+@RunWith(FlutterTestRunner.class)
+public class MainActivityTest {
+  @Rule
+  public ActivityTestRule<MainActivity> rule =
+      new ActivityTestRule<>(MainActivity.class, true, false);
+}

packages/espresso/example/android/app/src/androidTest/java/io/flutter/com/example/espresso_example/MainActivityTest.java

@@ -0,0 +1,21 @@
+// 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;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/*
+ * Annotation to aid flutter_plugin_tools in determining if a test is a native
+ * java unit test OR a java class with a dart integration.
+ *
+ * See: https://github.com/flutter/flutter/wiki/Plugin-Tests#enabling-android-ui-tests
+ * for more infomation.
+ */
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.TYPE)
+public @interface DartIntegrationTest {}

packages/espresso/example/android/app/src/androidTest/java/io/flutter/plugins/DartIntegrationTest.java

@@ -10,5 +10,7 @@
 
 public class MainActivity extends FlutterActivity {
   @Override
-  public void configureFlutterEngine(@NonNull FlutterEngine flutterEngine) {}
+  public void configureFlutterEngine(@NonNull FlutterEngine flutterEngine) {
+    super.configureFlutterEngine(flutterEngine);
+  }
 }

packages/espresso/example/android/app/src/main/java/com/example/espresso_example/MainActivity.java

@@ -5,7 +5,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:7.0.1'
+        classpath 'com.android.tools.build:gradle:7.3.0'
     }
 }
 

packages/espresso/example/android/build.gradle

@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.0.2-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.4.2-all.zip

packages/espresso/example/android/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,12 @@
+// 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.
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:integration_test/integration_test.dart';
+
+void main() {
+  IntegrationTestWidgetsFlutterBinding.ensureInitialized();
+
+  testWidgets('placeholder test', (WidgetTester tester) async {});
+}

packages/espresso/example/integration_test/espresso_launch_test.dart

@@ -22,6 +22,8 @@ dev_dependencies:
     sdk: flutter
   flutter_test:
     sdk: flutter
+  integration_test:
+    sdk: flutter
 
 flutter:
   uses-material-design: true