// example cannot handle nulls, test invalid
      return;
    }
    int[] expected = {0, 1, 2, 0, 4, 0};
    checkIndexOf(toTest, expected);
  }

  public void testLastIndexOfImpl_nonNull() {
    List<Integer> toTest = createList(Integer.class, 1, 5, 6, 10, 1, 3, 2, 1, 6);
    int[] expected = {7, 1, 8, 3, 7, 5, 6, 7, 8};
    checkLastIndexOf(toTest, expected);
  }

      // example cannot handle nulls, test invalid
      return;
    }
    int[] expected = {0, 1, 2, 0, 4, 0};
    checkIndexOf(toTest, expected);
  }

  public void testLastIndexOfImpl_nonNull() {
    List<Integer> toTest = createList(Integer.class, 1, 5, 6, 10, 1, 3, 2, 1, 6);
    int[] expected = {7, 1, 8, 3, 7, 5, 6, 7, 8};
    checkLastIndexOf(toTest, expected);
  }