ci: configure GitHub Actions to use integration_test package (#8910)

* Add `integration_test.dart`

* Add dummy `e2e_test.dart` file

* Add `integration_test` package

* Run integration tests for every pull request

* Use `IntegrationTestWidgetsFlutterBinding.ensureInitialized();`

* Format & use `flutter test`

* Use multidex

* Add new line for `FlutterMultiDexApplication.java`

* Format to pass CI

* Add comment for `flutter drive` command

* Use `flutter test` command for macos test

* Format test command for android

* Use one line comment

* Re-trigger CI

* Re-trigger CI

* Bump `minSdkVersion` to 21 for tests app

Author: nilsreichardt

.github/workflows/e2e_tests.yaml

@@ -70,7 +70,7 @@ jobs:
           working-directory: tests
           script: |
             sleep 15
-            flutter drive --target=./test_driver/driver_e2e.dart --dart-define=CI=true
+            flutter test integration_test/e2e_test.dart --dart-define=CI=true
 
   ios:
     runs-on: macos-latest
@@ -118,7 +118,7 @@ jobs:
           export CCACHE_DEPEND=true
           export CCACHE_INODECACHE=true
           ccache -s
-          flutter build ios --no-codesign --simulator --debug --target=./test_driver/driver_e2e.dart --dart-define=CI=true
+          flutter build ios --no-codesign --simulator --debug --target=integration_test/e2e_test.dart --dart-define=CI=true
           ccache -s
       - name: Start Firebase Emulator
         run: cd ./.github/workflows/scripts && ./start-firebase-emulator.sh
@@ -133,7 +133,7 @@ jobs:
           sleep 15
           # Uncomment following line to have simulator logs printed out for debugging purposes.
           # xcrun simctl spawn booted log stream --predicate 'eventMessage contains "flutter"' &
-          flutter drive -d "$SIMULATOR" --target=./test_driver/driver_e2e.dart --dart-define=CI=true
+          flutter test integration_test/e2e_test.dart -d "$SIMULATOR" --dart-define=CI=true
           FLUTTER_DRIVE_EXIT_CODE=$?
           xcrun simctl shutdown "$SIMULATOR"
           exit $FLUTTER_DRIVE_EXIT_CODE
@@ -190,14 +190,17 @@ jobs:
           export CCACHE_DEPEND=true
           export CCACHE_INODECACHE=true
           ccache -s
-          flutter build macos --debug --target=./test_driver/driver_e2e.dart --device-id=macos --dart-define=CI=true
+          flutter build macos --debug --target=integration_test/e2e_test.dart --device-id=macos --dart-define=CI=true
           ccache -s
       - name: Start Firebase Emulator
         run: cd ./.github/workflows/scripts && ./start-firebase-emulator.sh
       - name: "E2E Tests"
         working-directory: tests
         run: |
-          flutter drive -d macos --target=./test_driver/driver_e2e.dart --dart-define=CI=true
+          flutter test \
+            integration_test/e2e_test.dart \
+            -d macos \
+            --dart-define=CI=true
 
   web:
     runs-on: ubuntu-latest
@@ -229,6 +232,14 @@ jobs:
         run: cd ./.github/workflows/scripts && ./start-firebase-emulator.sh
       - name: "E2E Tests"
         working-directory: tests
+        # Web devices are not supported for the `flutter test` command yet. As a
+        # workaround we can use the `flutter drive` command. Tracking issue:
+        # https://github.com/flutter/flutter/issues/66264
         run: |
           chromedriver --port=4444 &
-          flutter drive --verbose-system-logs --device-id=web-server --target=./test_driver/driver_e2e.dart --dart-define=CI=true
+          flutter drive \
+            --verbose-system-logs \
+            -d web-server \
+            --driver=test_driver/integration_test.dart \
+            --target=integration_test/e2e_test.dart \
+            --dart-define=CI=true

tests/android/app/build.gradle

@@ -47,10 +47,11 @@ android {
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "io.flutter.plugins.firebase.tests"
-        minSdkVersion 19
+        minSdkVersion 21
         targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
+        multiDexEnabled true
     }
 
     buildTypes {
@@ -67,5 +68,6 @@ flutter {
 }
 
 dependencies {
+    implementation 'com.android.support:multidex:1.0.3'
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
 }

tests/android/app/src/main/java/io/flutter/app/FlutterMultiDexApplication.java

@@ -1,14 +1,19 @@
 // Generated file.
+//
 // If you wish to remove Flutter's multidex support, delete this entire file.
+//
+// Modifications to this file should be done in a copy under a different name
+// as this file may be regenerated.
 
 package io.flutter.app;
 
+import android.app.Application;
 import android.content.Context;
 import androidx.annotation.CallSuper;
 import androidx.multidex.MultiDex;
 
-/** Extension of {@link io.flutter.app.FlutterApplication}, adding multidex support. */
-public class FlutterMultiDexApplication extends FlutterApplication {
+/** Extension of {@link android.app.Application}, adding multidex support. */
+public class FlutterMultiDexApplication extends Application {
   @Override
   @CallSuper
   protected void attachBaseContext(Context base) {

tests/integration_test/e2e_test.dart

@@ -0,0 +1,12 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:integration_test/integration_test.dart';
+
+void main() {
+  IntegrationTestWidgetsFlutterBinding.ensureInitialized();
+
+  group('FlutterFire', () {
+    test('dummy test', () {
+      expect(true, true);
+    });
+  });
+}

tests/pubspec.yaml

@@ -202,6 +202,8 @@ dev_dependencies:
     sdk: flutter
   flutter_test:
     sdk: flutter
+  integration_test:
+    sdk: flutter
 
 flutter:
   uses-material-design: true

tests/test_driver/integration_test.dart

@@ -0,0 +1,3 @@
+import 'package:integration_test/integration_test_driver.dart';
+
+Future<void> main() => integrationDriver();