e2e #

This package enables self-driving testing of Flutter code on devices and emulators. It can adapt the test results in a format that is compatible with flutter drive and native Android instrumentation testing.

iOS support is not available yet, but is planned in the future.

Usage #

Add a dependency on the e2e package in the dev_dependencies section of pubspec.yaml. For plugins, do this in the pubspec.yaml of the example app.

Invoke E2EWidgetsFlutterBinding.ensureInitialized() at the start of a test file, e.g.

import 'package:e2e/e2e.dart';

void main() {
  E2EWidgetsFlutterBinding.ensureInitialized();
  testWidgets("failing test example", (WidgetTester tester) async {
    expect(2 + 2, equals(5));
  });
  exit(result == 'pass' ? 0 : 1);
}

Using Flutter driver to run tests #

E2EWidgetsTestBinding supports launching the on-device tests with flutter drive. Note that the tests don't use the FlutterDriver API, they use testWidgets instead.

Put the a file named <package_name>_test.dart in the app' test_driver directory:

import 'package:flutter_driver/flutter_driver.dart';

Future<void> main() async {
  final FlutterDriver driver = await FlutterDriver.connect();
  await driver.requestData(null, timeout: const Duration(minutes: 1));
  driver.close();
  exit(result == 'pass' ? 0 : 1);
}

To run a example app test with Flutter driver:

cd example
flutter drive test/<package_name>_e2e.dart

To test plugin APIs using Flutter driver:

cd example
flutter drive --driver=test_driver/<package_name>_test.dart test/<package_name>_e2e.dart

Android device testing #

Create an instrumentation test file in your application's android/app/src/androidTest/java/com/example/myapp/ directory (replacing com, example, and myapp with values from your app's package name). You can name this test file MainActivityTest.java or another name of your choice.

package com.example.myapp;

import androidx.test.rule.ActivityTestRule;
import dev.flutter.plugins.e2e.FlutterRunner;
import org.junit.Rule;
import org.junit.runner.RunWith;

@RunWith(FlutterRunner.class)
public class MainActivityTest {
  @Rule
  public ActivityTestRule<MainActivity> rule = new ActivityTestRule<>(MainActivity.class);
}

Update your application's myapp/android/app/build.gradle to make sure it uses androidx's version of AndroidJUnitRunner and has androidx libraries as a dependency.

android {
  ...
  defaultConfig {
    ...
    testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
  }
}

dependencies {
    testImplementation 'junit:junit:4.12'

    // https://developer.android.com/jetpack/androidx/releases/test/#1.2.0
    androidTestImplementation 'androidx.test:runner:1.2.0'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
}

To e2e test on a local Android device (emulated or physical):

./gradlew connectedAndroidTest -Ptarget=`pwd`/../test_driver/<package_name>_e2e.dart

Firebase Test Lab #

To run an e2e test on Android devices using Firebase Test Lab, use gradle commands to build an instrumentation test for Android.

pushd android
./gradlew assembleAndroidTest
./gradlew assembleDebug -Ptarget=<path_to_test>.dart
popd

Upload to Firebase Test Lab, making sure to replace <PATH_TO_KEY_FILE>, <PROJECT_NAME>, <RESULTS_BUCKET>, and <RESULTS_DIRECTORY> with your values.

gcloud auth activate-service-account --key-file=<PATH_TO_KEY_FILE>
gcloud --quiet config set project <PROJECT_NAME>
gcloud firebase test android run --type instrumentation \
  --app build/app/outputs/apk/debug/app-debug.apk \
  --test build/app/outputs/apk/androidTest/debug/app-debug-androidTest.apk\
  --timeout 2m \
  --results-bucket=<RESULTS_BUCKET> \
  --results-dir=<RESULTS_DIRECTORY>

iOS support for Firebase Test Lab is not yet available, but is planned.