#include <QApplication>
#include <QFont>
#include <QPushButton>
#include "test.h"

int main(int argc, char* argv[])
{
    QApplication app(argc, argv);

    Test t;
    t.show();

    return app.exec();
}

#ifndef TEST_H
#define TEST_H

#include <QMainWindow.h>


class Test : public QMainWindow
{
    Q_OBJECT
    public:
        Test(QWidget* = NULL);
        virtual ~Test();
    protected:
    private:
};

#endif // TEST_H

#include "test.h"

Test::Test(QWidget* parent): QMainWindow(parent)
{
    //ctor
}

Test::~Test()
{
    //dtor
}

-------------- Build: Debug in QTesting ---------------

Linking console executable: bin\Debug\QTesting.exe
obj\Debug\test.o: In function `_ZN4TestC2EP7QWidget':
C:/Users/Edward/Programming/QTesting/test.cpp:4: undefined reference to `vtable for Test'
C:/Users/Edward/Programming/QTesting/test.cpp:4: undefined reference to `vtable for Test'
obj\Debug\test.o: In function `_ZN4TestC1EP7QWidget':
C:/Users/Edward/Programming/QTesting/test.cpp:4: undefined reference to `vtable for Test'
C:/Users/Edward/Programming/QTesting/test.cpp:4: undefined reference to `vtable for Test'
obj\Debug\test.o: In function `_ZN4TestD2Ev':
C:/Users/Edward/Programming/QTesting/test.cpp:9: undefined reference to `vtable for Test'
obj\Debug\test.o:C:/Users/Edward/Programming/QTesting/test.cpp:9: more undefined references to `vtable for Test' follow
collect2: ld returned 1 exit status
Process terminated with status 1 (0 minutes, 0 seconds)
6 errors, 0 warnings