assertEquals(ImmutableMap.of(1, 'a', 3, 'c'), map.get("foo"));
    map.clear();
    assertTrue(map.isEmpty());
    assertEquals(singleton("bar"), sortedTable.rowKeySet());
  }

  public void testRowKeyMapSubMap() {
    sortedTable = create("foo", 1, 'a', "bar", 1, 'b', "foo", 3, 'c', "dog", 2, 'd');
    Map<String, Map<Integer, Character>> map = sortedTable.rowMap().subMap("cat", "egg");