AndroidJUnit4.class is deprecated: How to use androidx.test.ext.junit.runners.AndroidJUnit4?

According to the documentation for AndroidJUnit4,

The gradle file should contain the following line:

androidTestImplementation 'androidx.test.ext:junit:1.1.1'

Change test class to AndroidJUnit4ClassRunner from AndroidJUnit4

If it still doesn't work, make sure that you clean and/or rebuild your project. Also you can check the current version directly in Google's maven repository

If you've tried @MarcelGangwisch's solution and your build fails saying it can't find the resource AND you also cleaned/rebuilt your project and it still doesn't work, try this: (based also on @KrzysztofDziuba's solution)

In your gradle file where you changed the dependency, make sure you are adding it as the type you need, ie.:

For UI tests:

androidTestImplementation 'androidx.test.ext:junit:1.1.0'

For Unit tests:

testImplementation 'androidx.test.ext:junit:1.1.0'

In my instance I added it as both and now it works.

For me the following steps worked:
1. Replace the androidx libraries with the one posted here . my final app/build.gradle looked like this:

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

    }
    ...
}

dependencies {
    ...
    testImplementation 'junit:junit:4.12'

    // Core library
    androidTestImplementation 'androidx.test:core:1.2.0'

    // AndroidJUnitRunner and JUnit Rules
    androidTestImplementation 'androidx.test:runner:1.2.0'
    androidTestImplementation 'androidx.test:rules:1.2.0'

    // Assertions
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.ext:truth:1.2.0'
    androidTestImplementation 'com.google.truth:truth:0.42'

    // Espresso dependencies
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'

}

I then manually replaced the imported modules in my ExampleInstrumentTest.java class with latest classes:

import androidx.test.internal.runner.junit4.AndroidJUnit4ClassRunner;
import androidx.test.platform.app.InstrumentationRegistry;
import androidx.test.rule.ActivityTestRule;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.runner.RunWith;

@RunWith(AndroidJUnit4ClassRunner.class)
public class ExampleInstrumentedTest {
    ...
    @Rule
    public final ActivityTestRule<MainActivity> main = new ActivityTestRule<>(MainActivity.class, true);

    @Before
    public void init() {
        ...
    }
    @Test
    public void listCount() {
        ...
    }

    @Test
    public void useAppContext() {
        Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();

        Assert.assertEquals("in.curioustools.aad_x_testing2", appContext.getPackageName());
        System.out.println("useAppContext : Test Ran");
    }
}

The thing that was bugging me was the fact that InstrumentationRegistery class was still deprecated. So i used InstrumentationRegistry.getInstrumentation().getTargetContext(); from androidx.test.platform.app.InstrumentationRegistry class.

Solution

Add this line in to build.gradle: androidTestImplementation 'androidx.test.ext:junit:1.1.1' Change AndroidJUnit4 to AndroidJUnit4ClassRunner in the test class

Warning

I got the same error, but the following solution failed for me:

File -> Invalidate Caches..., and select Invalidate and Restart

I tried all given above until I went to the official Android site, and they suggested importing from androidx.test.ext.junit.runners.AndroidJUnit4 instead of androidx.test.runner.AndroidJUnit4. link

Include these lines in build.gradle app module. testImplementation 'androidx.test.ext:junit:1.1.1' androidTestImplementation 'androidx.test.ext:junit:1.1.1' In the test class replace your test runner to import androidx.test.ext.junit.runners.AndroidJUnit4; If InstrumentationRegistry.getTargetContext() is deprecated use InstrumentationRegistry from androidx.test.platform.app like this InstrumentationRegistry.getInstrumentation().getTargetContext()

In my case changing androidTestImplementation to testImplementation helped. I did't know the difference before reading this android difference between testImplementation and androidTestImplementation in build.gradle

If you imported those AnroidX test libraries, synced and re-built the project, but the imported packages were still not resolved. Just remember how you upgraded your project to AndroidX, close Android Studio and remove the .idea folder and reopen your project again...

This worked for me !