### Question:
CensusIncomeDAO extends DatasetsDAO { public static long selectCount() { String SELECT_COUNT = "SELECT COUNT(*) FROM CENSUS_INCOME"; return Yank.queryScalar(SELECT_COUNT, Long.class, null); }  static void init(String dataFilesDir); static int dropTable(); static int getTrainTestSplit(); static int createTable(); static int insert(CensusIncome censusIncome); static long selectCount(); static CensusIncome selectSingle(int id);  }### Answer:
@Test public void testSelectCount() { long count = CensusIncomeDAO.selectCount(); assertThat(count, equalTo(48842L)); }