FP on S2187 when test class is a JUnit4 test class also inheriting from a JUnit3 TestCase

import org.junit.Test;

public class ReproducerTest extends AbstractJUnit4Test {  // FP HERE
  @Test public void shouldFoo() { assertTrue(1 + 1 == 2); }
}

import org.junit.Rule;
import org.junit.rules.TestRule;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
import org.junit.runners.model.Statement;

@RunWith(JUnit4.class)
public abstract class AbstractJUnit4Test extends AbstractJUnit3TestCase {

  @Rule
  public TestRule rule = (base, description) -> new Statement() {
    @Override
    public void evaluate() throws Throwable {
      String name = description.getMethodName();
      setName(name.startsWith("test") ? name : "test" + name);
      setUp();
      try {
        base.evaluate();
      } finally {
        tearDown();
      }
    }
  };
}

import junit.framework.TestCase;

public abstract class AbstractJUnit3TestCase extends TestCase {

  @Override
  protected void setUp() throws Exception { System.out.println("setUp"); }

  @Override
  protected void tearDown() throws Exception { System.out.println("tearDown"); }
}