code: public int countAll(){
          checkTable();
  
          Cursor mCount = null;
          try {
              mCount = database.rawQuery("SELECT COUNT(*) FROM \"" + tableName + "\"", null);
              if (mCount.moveToNext()) {
                  return mCount.getInt(1);
              }
          } finally {
              if (mCount != null) {
                  mCount.close();
              }
          }
          return 0;
      }
docs: Just for unit test