public void addRow( int i, List<String> row ) {
        AssertionUtil.assertTrue( getColumnCount() == row.size(),
            "Row has different number of columns as expected. Is " + row.size() + ", but expected " + getColumnCount() );

        data.add( i, row );
    }
The data of the table as a list of rows
jgiven-core/src/main/java/com/tngtech/jgiven/report/model/DataTable.java