/**
 * Unit test for {@link Optional}.
 *
 * @author Kurt Alfred Kluever
 */
@NullMarked
@GwtCompatible
public final class OptionalTest extends TestCase {
  @SuppressWarnings("NullOptional")
  public void testToJavaUtil_static() {
    assertThat(Optional.toJavaUtil(null)).isNull();
    assertEquals(java.util.Optional.empty(), Optional.toJavaUtil(Optional.absent()));