return;
    }
    fail("Should get equal to null error");
  }

  /** Test proper handling where an object incorrectly tests for an incompatible class */
  public void testInvalidEqualsIncompatibleClass() {
    Object obj = new InvalidEqualsIncompatibleClassObject();
    equalsTester.addEqualityGroup(obj);
    try {
      equalsTester.testEquals();
    } catch (AssertionFailedError e) {