Delegate runner androidx.test.internal.runner.junit4.androidjunit4classrunner for androidjunit4 could not be found.

The error message you are receiving indicates that the AndroidJUnit4ClassRunner class from the androidx.test.internal.runner.junit4 package could not be found.

This can happen due to various reasons, such as missing dependencies or incorrect configuration. To resolve this issue, here are a few steps you can follow:

1. Make sure you have added all the necessary dependencies to your project. In this case, you need to ensure that you have included the androidx.test library in your build.gradle file:

    
      dependencies {
          // other dependencies
          androidTestImplementation 'androidx.test:runner:1.4.0'
      }
    
  

2. Verify that your test class is using the correct annotations and configurations. For example, if you are using JUnit4 for your tests, make sure your test class is annotated with @RunWith(AndroidJUnit4.class):

    
      import org.junit.Test;
      import org.junit.runner.RunWith;
      import androidx.test.ext.junit.runners.AndroidJUnit4;
      
      @RunWith(AndroidJUnit4.class)
      public class ExampleTest {
          // test methods
      }
    
  

By following these steps, you should be able to resolve the issue and successfully run your tests using the AndroidJUnit4ClassRunner.