How to use android.test.mock in Android Studio

Question

I'm trying to use MockContext in unit tests for Android projects in Android Studio. The problem is, package android.test.* is not visible in the project.

I'm not sure what should I add to Gradle in order to import it. I tried com.android.support.test:rules:1.0.2 and androidx.test:rules:1.1.1 (one of the suggestions made by IDE), but that's not the one I'm looking for.

build.gradle:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "com.myApp"
        minSdkVersion 23
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    //noinspection GradleCompatible
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.android.support:design:28.0.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
    implementation 'com.google.firebase:firebase-core:16.0.8'
    implementation 'com.android.support:recyclerview-v7:28.0.0'
    testImplementation 'com.android.support.test:rules:1.0.2'
}

apply plugin: 'com.google.gms.google-services'

Error message when compiling:

error: package android.test.mock does not exist

What should I add to gradle to have access to android.test packages?

Answer 1

Actually, you can access android.test.mock from your unit tests and gain access to the MockContext class. For AndroidX projects, you can add the following in your app module's build.gradle:

android {
    ...
    useLibrary 'android.test.mock'
}

Source: https://developer.android.com/training/testing/set-up-project