Don't Have to Follow Naming Conventions

import org.junit.Test;
import junit.framework.TestCase;

public class AdditionTest extends TestCase {

  private int x = 1;
  private int y = 1;
  
  @Test public void additionTest() {
    int z = x + y;
    assertEquals(2, z);
  }

}

or

import org.junit.Test;
import junit.framework.TestCase;

public class AdditionTest extends TestCase {

  private int x = 1;
  private int y = 1;
  
  @Test public void addition() {
    int z = x + y;
    assertEquals(2, z);
  }

}