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Runs tests that use the flutter_test API as integration tests.

integration_test #

This package enables self-driving testing of Flutter code on devices and emulators. It adapts flutter_test results into a format that is compatible with flutter drive and native Android instrumentation testing.

Usage #

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

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

import 'package:flutter_test/flutter_test.dart';
import 'package:integration_test/integration_test.dart';

void main() {
  IntegrationTestWidgetsFlutterBinding.ensureInitialized();
  testWidgets("failing test example", (WidgetTester tester) async {
    expect(2 + 2, equals(5));
  });
}

Test locations #

It is recommended to put integration_test tests in the test/ folder of the app or package. For example apps, if the integration_test test references example app code, it should go in example/test/. It is also acceptable to put integration_test tests in test_driver/ folder so that they're alongside the runner app (see below).

Using Flutter Driver to Run Tests #

IntegrationTestWidgetsTestBinding 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>_integration_test.dart in the app' test_driver directory:

import 'dart:async';

import 'package:integration_test/integration_test_driver.dart';

Future<void> main() async => integrationDriver();

To run a example app test with Flutter driver:

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

To test plugin APIs using Flutter driver:

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

You can run tests on web in release or profile mode.

First you need to make sure you have downloaded the driver for the browser.

cd example
flutter drive -v --target=test_driver/<package_name>dart -d web-server --release --browser-name=chrome

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.integration_test.FlutterTestRunner;
import org.junit.Rule;
import org.junit.runner.RunWith;

@RunWith(FlutterTestRunner.class)
public class MainActivityTest {
  @Rule
  public ActivityTestRule<MainActivity> rule = new ActivityTestRule<>(MainActivity.class, true, false);
}

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

./gradlew app:connectedAndroidTest -Ptarget=`pwd`/../test_driver/<package_name>_integration_test.dart

Firebase Test Lab #

If this is your first time testing with Firebase Test Lab, you'll need to follow the guides in the Firebase test lab documentation to set up a project.

To run a test on Android devices using Firebase Test Lab, use gradle commands to build an instrumentation test for Android, after creating androidTest as suggested in the last section.

pushd android
# flutter build generates files in android/ for building the app
flutter build apk
./gradlew app:assembleAndroidTest
./gradlew app:assembleDebug -Ptarget=<path_to_test>.dart
popd

Upload the build apks 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>

You can pass additional parameters on the command line, such as the devices you want to test on. See gcloud firebase test android run.

iOS device testing #

You need to change iOS/Podfile to avoid test target statically linking to the plugins. One way is to link all of the plugins dynamically:

target 'Runner' do
  use_frameworks!
  ...
end

To run a test on your iOS device (simulator or real), rebuild your iOS targets with Flutter tool.

flutter build ios -t test_driver/<package_name>_integration_test.dart (--simulator)

Open Xcode project (by default, it's ios/Runner.xcodeproj). Create a test target (navigating File > New > Target... and set up the values) and a test file RunnerTests.m and change the code. You can change RunnerTests.m to the name of your choice.

#import <XCTest/XCTest.h>
#import <integration_test/IntegrationTestIosTest.h>

INTEGRATION_TEST_IOS_RUNNER(RunnerTests)

Now you can start RunnerTests to kick out integration tests!

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Runs tests that use the flutter_test API as integration tests.

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Dependencies

flutter, flutter_driver, flutter_test, path

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