Java Question Error create library with SLC

Starting step: Compiling Java code.
D:\Basic4android Proyectos\my_wrapper\as_wrapper\app\src\androidTest\java\com\example\my_wrapper\ExampleInstrumentedTest.java:5: error: package androidx.test.platform.app does not exist
import androidx.test.platform.app.InstrumentationRegistry;

How do you expect anyone can help you with the Informations you provide?
- Upload the source of your library you want to compile with SLC
- Post the FULL compilewindow output from SLC.

I am creating a lib with SLC and I get this error message:

Starting step: Compiling Java code.
D:\Basic4android Proyectos\my_wrapper\as_wrapper\app\src\androidTest\java\com\example\my_wrapper\ExampleInstrumentedTest.java:5: error: package androidx.test.platform.app does not exist
import androidx.test.platform.app.InstrumentationRegistry;


package com.example.my_wrapper;

import android.content.Context;

import androidx.test.platform.app.InstrumentationRegistry; <---- This Line
import androidx.test.ext.junit.runners.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.getInstrumentation().getTargetContext();

assertEquals("com.example.my_wrapper", appContext.getPackageName());
}
}

1. Open B4A Sdk Manager.
2. Search for androix.test and install the various components.
3. Create an empty project in B4A, add #AdditionalJar: androidx.test:monitor
4. Run the project
5. The jar file with the required class will be located in:
C:\android-sdk\extras\b4a_remote\androidx\test\monitor\1.2.0\unpacked-monitor-1.2.0\jars\classes.jar

You will need to copy it to the libs folder. It is only needed during compilation. The library should include @DependsOn(values={"androidx.test:monitor"})