void test(HMultiHeader* header)
{
    QTableWidget* table = reinterpret_cast<QTableWidget*>(header->parent());
    table->setColumnCount(27);

    #define SPANCOLS(txt,start,stop) \
    if (!header->spanCols(QString("%1 %2-%3").arg(txt).arg(start).arg(stop),start,stop))\
    std::cout << "Fail! start: " << start << " stop: " << stop << std::endl;

    SPANCOLS("SPANNED HEADER",0,8);
    SPANCOLS("SPANNED HEADER",9,17);
    SPANCOLS("SPANNED HEADER",18,26);

    SPANCOLS("SUB SPANNED HEADER",0,2);
    SPANCOLS("SUB SPANNED HEADER",3,5);
    SPANCOLS("SUB SPANNED HEADER",6,8);
    SPANCOLS("SUB SPANNED HEADER",9,11);
    SPANCOLS("SUB SPANNED HEADER",12,14);
    SPANCOLS("SUB SPANNED HEADER",15,17);
    SPANCOLS("SUB SPANNED HEADER",18,20);
    SPANCOLS("SUB SPANNED HEADER",21,23);
    SPANCOLS("SUB SPANNED HEADER",24,26);

    for (int i=0; i!=27; i++)
        table->setHorizontalHeaderItem(i, new QTableWidgetItem("text"));
}