initCollectionWithNullElement();
    assertEquals(
        getMethodName() + "(null) should return " + getNullLocation(),
        getNullLocation(),
        find(null));
  }

  public void testFind_wrongType() {
    try {
      assertEquals(
          getMethodName() + "(wrongType) should return -1 or throw", -1, find(WrongType.VALUE));
    } catch (ClassCastException tolerated) {
    }
  }