code: public void shouldBeEmpty(IDataSet dataSet, String tableName, AssertionErrorCollector errorCollector)
          throws DataSetException {
          final SortedTable tableState = new SortedTable(dataSet.getTable(tableName));
          int rowCount = tableState.getRowCount();
          if (rowCount != 0) {
              errorCollector.collect(new AssertionError(tableName + " expected to be empty, but was <" + rowCount + ">."));
          }
      }
docs: -- Private methods