Didn't find class "android.support.test.runner.AndroidJUnitRunner"

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I'm trying to use an instrumented test and I updated my project to AndroidX. But I get the following error while trying to run:

2018-10-09 14:22:29.468 13263-13263/xxx.yyy E/AndroidRuntime: FATAL EXCEPTION: main
    Process: xxx.yyy, PID: 13263
    java.lang.RuntimeException: Unable to instantiate instrumentation ComponentInfo{xxx.yyy.test/android.support.test.runner.AndroidJUnitRunner}: java.lang.ClassNotFoundException: Didn't find class "android.support.test.runner.AndroidJUnitRunner" on path: DexPathList[[],nativeLibraryDirectories=[/system/lib, /vendor/lib]]
        at android.app.ActivityThread.handleBindApplication(ActivityThread.java:5730)
        at android.app.ActivityThread.-wrap1(Unknown Source:0)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1661)
        at android.os.Handler.dispatchMessage(Handler.java:105)
        at android.os.Looper.loop(Looper.java:164)
        at android.app.ActivityThread.main(ActivityThread.java:6541)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
     Caused by: java.lang.ClassNotFoundException: Didn't find class "android.support.test.runner.AndroidJUnitRunner" on path: DexPathList[[],nativeLibraryDirectories=[/system/lib, /vendor/lib]]
        at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:93)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
        at android.app.ActivityThread.handleBindApplication(ActivityThread.java:5728)
        at android.app.ActivityThread.-wrap1(Unknown Source:0) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1661) 
        at android.os.Handler.dispatchMessage(Handler.java:105) 
        at android.os.Looper.loop(Looper.java:164) 
        at android.app.ActivityThread.main(ActivityThread.java:6541) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767) 

My test looks like this:

package xxx.yyy;

import android.content.Context;
import androidx.test.InstrumentationRegistry;
import androidx.test.runner.AndroidJUnit4;

import org.junit.Test;
import org.junit.runner.RunWith;

import static org.junit.Assert.*;

/**
 * Instrumented test, which will execute on an Android device.
 *
 * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
 */
@RunWith(AndroidJUnit4.class)
public class ExampleInstrumentedTest {
    @Test
    public void useAppContext() {
        // Context of the app under test.
        Context appContext = InstrumentationRegistry.getTargetContext();

        assertEquals("xxx.yyy", appContext.getPackageName());
    }
}

Didn't find class "android.support.test.runner.AndroidJUnitRunner"

You migrated to AndroidX but as you can see, there is-are still usages of android.support test libraries in your project.

To solve this, you should search for anything in anywhere in your project which starts by android.support and replace it or removing it to use AndroidX libraries.

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Inside the build.gradle file there you find the defaultConfig section. With the testInstrumentationRunner attribute the respective test runner can be specified. There the test runner from the android.support package might be specified:

testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

this has to be change to the test runner from the androidx package:

testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"

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I had the same issue when i forgot add dependency to android test runner. So adding this helped:

androidTestImplementation("androidx.test:runner:1.2.0")

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Comments
  • Seems impossible to eliminate everything from an app, which starts with android.support. e.g. android.support.v7.app.AppCompatActivity
  • @Stefan actually, AppCompatActivity has its androidx counterpart: androidx.appcompat.app.AppCompatActivity :)
  • I didn't migrate to AndroidX but came with the same issue here. Any ideas? btw I have enabled multidex in my project.
  • This fixed the issue for me
  • for me this just made the error in logcat disappear, but eventual result would stay the same.