assertThat(
            ((SortedMap<Integer, Character>) sortedTable.rowMap().values().iterator().next())
                .comparator())
        .isEqualTo(Ordering.usingToString());
  }

  public void testRowKeySetComparator() {
    sortedTable = TreeBasedTable.create();
    assertThat(sortedTable.rowKeySet().comparator()).isEqualTo(Ordering.natural());