@Test
public void testModifyFamilyAsync() throws Exception {

  ModifyColumnFamiliesRequest request =
      ModifyColumnFamiliesRequest.of(TABLE_ID)
          .addFamily("first-family")
          .addFamily("another-family");
  Future<Table> response = adminGCJClient.modifyFamiliesAsync(request);
  List<ColumnFamily> columnFamilies = response.get().getColumnFamilies();
  assertEquals("first-family", columnFamilies.get(0).getId());
  assertEquals("another-family", columnFamilies.get(1).getId());
}