assertEquals(getMethodName() + "(notPresent) should return -1", -1, find(e3()));
  }

  @CollectionFeature.Require(ALLOWS_NULL_VALUES)
  @CollectionSize.Require(absent = ZERO)
  public void testFind_nullContained() {
    initCollectionWithNullElement();
    assertEquals(
        getMethodName() + "(null) should return " + getNullLocation(),
        getNullLocation(),
        find(null));
  }