@Test
  public void testAreBrawlingNoBrawlOpponentId() {
    WorldObject performer =
        TestUtils.createIntelligentWorldObject(1, Constants.BRAWL_OPPONENT_ID, null);
    WorldObject actionTarget =
        TestUtils.createIntelligentWorldObject(2, Constants.BRAWL_OPPONENT_ID, null);

    assertEquals(
        true,
        DefaultGoalObstructedHandler.areBrawling(
            performer, actionTarget, Actions.NON_LETHAL_MELEE_ATTACK_ACTION));

    performer.removeProperty(Constants.BRAWL_OPPONENT_ID);
    actionTarget.removeProperty(Constants.BRAWL_OPPONENT_ID);
    assertEquals(
        false,
        DefaultGoalObstructedHandler.areBrawling(
            performer, actionTarget, Actions.NON_LETHAL_MELEE_ATTACK_ACTION));
  }