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Description:

espresso

espresso #
Provides bindings for Espresso tests of Flutter Android apps.

Android

Support
SDK 16+

Installation #
Add the espresso package as a dev_dependency in your app's pubspec.yaml. If you're testing the example app of a package, add it as a dev_dependency of the main package as well.
Add android:usesCleartextTraffic="true" in the <application> in the AndroidManifest.xml
of the Android app used for testing. It's best to put this in a debug or androidTest
AndroidManifest.xml so that you don't ship it to end users. (See the example app of this package.)
Add the following dependencies in android/app/build.gradle:
dependencies {
testImplementation 'junit:junit:4.13.2'
testImplementation "com.google.truth:truth:1.1.3"
androidTestImplementation 'androidx.test:runner:1.6.1'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.6.1'
api 'androidx.test:core:1.2.0'
}
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Create an android/app/src/androidTest folder and put a test file in a package-appropriate subfolder, e.g. android/app/src/androidTest/java/com/example/MainActivityTest.java:
package com.example.espresso_example;

import static androidx.test.espresso.flutter.EspressoFlutter.onFlutterWidget;
import static androidx.test.espresso.flutter.action.FlutterActions.click;
import static androidx.test.espresso.flutter.action.FlutterActions.syntheticClick;
import static androidx.test.espresso.flutter.assertion.FlutterAssertions.matches;
import static androidx.test.espresso.flutter.matcher.FlutterMatchers.isDescendantOf;
import static androidx.test.espresso.flutter.matcher.FlutterMatchers.withText;
import static androidx.test.espresso.flutter.matcher.FlutterMatchers.withTooltip;
import static androidx.test.espresso.flutter.matcher.FlutterMatchers.withType;
import static androidx.test.espresso.flutter.matcher.FlutterMatchers.withValueKey;
import static com.google.common.truth.Truth.assertThat;
import static org.junit.Assert.fail;

import androidx.test.core.app.ActivityScenario;
import androidx.test.espresso.flutter.EspressoFlutter.WidgetInteraction;
import androidx.test.espresso.flutter.assertion.FlutterAssertions;
import androidx.test.espresso.flutter.matcher.FlutterMatchers;
import androidx.test.ext.junit.runners.AndroidJUnit4;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;

/** Unit tests for {@link EspressoFlutter}. */
@RunWith(AndroidJUnit4.class)
public class MainActivityTest {

@Before
public void setUp() throws Exception {
ActivityScenario.launch(MainActivity.class);
}

@Test
public void performClick() {
onFlutterWidget(withTooltip("Increment")).perform(click());
onFlutterWidget(withValueKey("CountText")).check(matches(withText("Button tapped 1 time.")));
}
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You'll need to create a test app that enables the Flutter driver extension.
You can put this in your test_driver/ folder, e.g. test_driver/example.dart.
Replace <app_package_name> with the package name of your app. If you're
developing a plugin, this will be the package name of the example app.
import 'package:flutter_driver/driver_extension.dart';
import 'package:<app_package_name>/main.dart' as app;

void main() {
enableFlutterDriverExtension();
app.main();
}
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The following command line command runs the test locally:
./gradlew app:connectedAndroidTest -Ptarget=`pwd`/../test_driver/example.dart
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Espresso tests can also be run on Firebase Test Lab:
./gradlew app:assembleAndroidTest
./gradlew app:assembleDebug -Ptarget=<path_to_test>.dart
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>
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