int main() {

    lxw_workbook  *workbook  = workbook_new("test_gridlines01.xlsx");
    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);

    worksheet_set_paper(worksheet, 9);
    worksheet->vertical_dpi = 200;

    worksheet_gridlines(worksheet, LXW_HIDE_ALL_GRIDLINES);

    worksheet_write_string(worksheet, CELL("A1"), "Foo" , NULL);

    return workbook_close(workbook);
}
// Test the _write_print_options() function.
CTEST(worksheet, write_print_options4) {

    char* got;
    char exp[] = "<printOptions gridLines=\"1\"/>";
    FILE* testfile = tmpfile();

    lxw_worksheet *worksheet = _new_worksheet(NULL);
    worksheet->file = testfile;
    worksheet_select(worksheet);

    worksheet_gridlines(worksheet, LXW_SHOW_PRINT_GRIDLINES);

    _worksheet_write_print_options(worksheet);

    RUN_XLSX_STREQ(exp, got);

    _free_worksheet(worksheet);
}