public DataTable subTable(int fromRow, int fromColumn) {
        return subTable(fromRow, fromColumn, height(), width());
    }
@Test
    void subTable_throws_for_large_to_column() {
        DataTable table = createSimpleTable();
        assertThrows(IndexOutOfBoundsException.class, () -> table.subTable(0, 0, 1, 4));
    }