public class FinalizableReferenceQueueTest {

  private @Nullable FinalizableReferenceQueue frq;

  @After
  public void tearDown() throws Exception {
    frq = null;
  }

  @Test
  public void testFinalizeReferentCalled() {
    MockReference reference = new MockReference(frq = new FinalizableReferenceQueue());

    GcFinalization.awaitDone(() -> reference.finalizeReferentCalled);
  }

public class FinalizableReferenceQueueTest {

  private @Nullable FinalizableReferenceQueue frq;

  @After
  public void tearDown() throws Exception {
    frq = null;
  }

  @Test
  public void testFinalizeReferentCalled() {
    MockReference reference = new MockReference(frq = new FinalizableReferenceQueue());

    GcFinalization.awaitDone(() -> reference.finalizeReferentCalled);
  }