Unresolved reference ActivityTestRule for AndroidX

Question

I'm trying to test my UI via instrumentation test, with androidX espresso library. In my grade I have:

apply plugin: 'com.android.application'  apply plugin: 'kotlin-android'  apply plugin: 'kotlin-android-extensions' apply plugin: "kotlin-kapt"  android {     compileSdkVersion 28     defaultConfig {         applicationId "it.zehus.mybike"         minSdkVersion 21         targetSdkVersion 28         versionCode 1         versionName "1.0"         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"         android.defaultConfig.manifestPlaceholders = ['appAuthRedirectScheme': 'net.openid.appauthdemo']     }     buildTypes {         release {             minifyEnabled false             proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'         }     } }  dependencies {     implementation fileTree(dir: 'libs', include: ['*.jar'])      def lifecycle_version = "2.0.0"     // ViewModel and LiveData     implementation "androidx.lifecycle:lifecycle-extensions:$lifecycle_version"      // room persistence library     def room_version = "2.1.0-alpha04"     implementation "androidx.room:room-runtime:$room_version"     kapt "androidx.room:room-compiler:$room_version" // use kapt for Kotlin     // optional - Coroutines support for Room     implementation "androidx.room:room-coroutines:$room_version"      implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"     implementation 'androidx.appcompat:appcompat:1.0.2'     implementation 'androidx.constraintlayout:constraintlayout:1.1.3'     implementation 'com.google.android.material:material:1.0.0'      // Espresso     androidTestImplementation 'androidx.test:runner:1.1.0'     androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.0'     implementation project(path: ':remotemanager')     implementation "org.jetbrains.kotlin:kotlin-reflect:1.3.21"      androidTestImplementation 'androidx.test.ext:junit:1.1.0'     // required if you want to use Mockito for unit tests     testImplementation 'org.mockito:mockito-core:2.24.5'     // required if you want to use Mockito for Android tests     androidTestImplementation 'org.mockito:mockito-android:2.24.5'     // Bluetooth sdk     implementation project(path: ':bluetoothmanager')     // Custom views     implementation project(path: ':customviews')   } 

As specified in the documentation I'm attempting to import ActivityTestRule class in my test, however the reference is unresolved.

import androidx.test.filters.LargeTest import androidx.test.runner.AndroidJUnit4 import org.junit.Rule import org.junit.Test import org.junit.runner.RunWith // unresolved reference here import androidx.test.rule.ActivityTestRule import it.zehus.mybike.ui.ride.RideActivity   /**  * Instrumented test, which will execute on an Android device.  *  * See [testing documentation](http://d.android.com/tools/testing).  */ // deprecated here @RunWith(AndroidJUnit4::class) @LargeTest class FragmentDashboardUiTest {     @get:Rule // unresolved reference here     val activityRule = ActivityTestRule(RideActivity::class.java)      @Test     fun myClassMethod_ReturnsTrue() {  } } 

Am I doing something wrong or there's a problem within AndroidX testing libraries?

Answer 1

I found out from this documentation page that class ActivityTestRule stays under androidx.test.rule in AndroidX. In order to import the package, I simply added:

 androidTestImplementation 'androidx.test:rules:1.2.0' 

to my gradle.

To sum up my gradle now contains:

// Espresso // Core library androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0' // AndroidJUnitRunner and JUnit Rules androidTestImplementation 'androidx.test:runner:1.2.0' androidTestImplementation 'androidx.test:rules:1.2.0' 

Answer 2

The class is under package: androidx.test.ext.junit.rules;

So obviously the most important dependency is:

androidTestImplementation 'androidx.test.ext:junit:1.1.2'

I am wondering why the other answer is uplifted so much, but it doesn't work for me at all.

Hope this helps others like me.