Java.lang.runtimeexception: failed to instantiate test runner class androidx.test.internal.runner.junit4.androidjunit4classrunner

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Exception: java.lang.RuntimeException: Failed to instantiate test runner class androidx.test.internal.runner.junit4.AndroidJUnit4ClassRunner

Explanation: This exception occurs when the test runner class, AndroidJUnit4ClassRunner, fails to be instantiated.

Example: Let’s assume we have a simple Android project with a single test class, MyTestClass, which is annotated with @RunWith(AndroidJUnit4ClassRunner.class) to use the AndroidJUnit4ClassRunner as the test runner.


import org.junit.Test;
import org.junit.runner.RunWith;
import androidx.test.internal.runner.junit4.AndroidJUnit4ClassRunner;

@RunWith(AndroidJUnit4ClassRunner.class)
public class MyTestClass {
  
  @Test
  public void testMethod() {
    // Perform some tests
  }
}

In this scenario, if the test runner class, AndroidJUnit4ClassRunner, cannot be instantiated due to any reason, the exception java.lang.RuntimeException: Failed to instantiate test runner class androidx.test.internal.runner.junit4.AndroidJUnit4ClassRunner will be thrown.

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