QTest GUI getting started

[jastmc]

I am trying to figure out how to use QTest to test my gui application, so I set up a simple program like the one in this posting Qt test empty window. (Using Qt 5.7 on Ubuntu)

When I try to run it, I get the message tst_mytest.cpp:33: undefined reference to `MyMainWindow::MyMainWindow(QWidget)'*.

This should be really simple but I can't figure out what it is.

Thanks,
Jas

//tst_mytest.cpp

#include <QString>
#include <QtTest>
#include <QCoreApplication>
#include "../MyApp/mymainwindow.h"
#include "../MyApp/ui_mymainwindow.h"

#include <QDebug>
#include <QPushButton>

class MyTest : public QObject
{
    Q_OBJECT

public:
    MyTest();

private Q_SLOTS:
    void initTestCase();
    void cleanupTestCase();
    void testCase1();

private:
    MyMainWindow* MyMainWindow_ ;

};

MyTest::MyTest()
{
}

void MyTest::initTestCase()
{
    MyMainWindow_ = new MyMainWindow;
    MyMainWindow_->show();

}

void MyTest::cleanupTestCase()
{
}

void MyTest::testCase1()
{
    QVERIFY2(true, "Failure");
}

QTEST_MAIN(MyTest)

#include "tst_mytest.moc"

//MyTest.pro

#-------------------------------------------------
#
# Project created by QtCreator 2017-11-06T10:12:26
#
#-------------------------------------------------

QT       += widgets testlib core

TARGET = tst_mytest
CONFIG   += console
CONFIG   -= app_bundle

TEMPLATE = app


SOURCES += tst_mytest.cpp
DEFINES += SRCDIR=\\\"$$PWD/\\\"

INCLUDEPATH += $$PWD/../MyApp

//mymainwindow.cpp

#include "mymainwindow.h"
#include "ui_mymainwindow.h"

MyMainWindow::MyMainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MyMainWindow)
{
    ui->setupUi(this);
}

MyMainWindow::~MyMainWindow()
{
    delete ui;
}

void MyMainWindow::on_pushButton_clicked()
{
    if (ui->checkBox->isChecked())
        ui->checkBox->setChecked(false);
    else
        ui->checkBox->setChecked(true);
}

//mymainwindow.h

#ifndef MYMAINWINDOW_H
#define MYMAINWINDOW_H

#include <QMainWindow>

namespace Ui {
class MyMainWindow;
}

class MyMainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MyMainWindow(QWidget *parent = 0);
    ~MyMainWindow();

private slots:
    void on_pushButton_clicked();

private:
    Ui::MyMainWindow *ui;
};

#endif // MYMAINWINDOW_H

//MyApp.pro

#ifndef MYMAINWINDOW_H
#define MYMAINWINDOW_H

#include <QMainWindow>

namespace Ui {
class MyMainWindow;
}

class MyMainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MyMainWindow(QWidget *parent = 0);
    ~MyMainWindow();

private slots:
    void on_pushButton_clicked();

private:
    Ui::MyMainWindow *ui;
};

#endif // MYMAINWINDOW_H

//MySolution.pro

TEMPLATE = subdirs  
SUBDIRS += MyApp \
    MyTest

[jastmc]

@jastmc said in QTest GUI getting started:

MyMainWindow_ = new MyMainWindow;

I should have said the error occurs on the line on the line

MyMainWindow_ = new MyMainWindow;

[JonB]

[EDIT: please ignore this post, it's irrelevant and wrong. Sorry!]

@jastmc
Since the example you quote uses:

mainWindow_ = new MainWindow();

why do you write

MyMainWindow_ = new MyMainWindow;

and then ask why it doesn't behave same?

[mrjj]

@jastmc said in QTest GUI getting started:

MyMainWindow_ = new MyMainWindow;

undefined reference to `MyMainWindow::MyMainWindow(QWidget)'*.

It says it dont know your constructor.

I would completely delete the build folder, and run qmake + rebuild all.

If error persists, please check that MyMainWindow.cpp is actual included into the .pro file
so it gets linked to the tst_mytest project.

[SGaist]

Hi,

In your test, you only build the test sources itself. What about the class you want to test ?

[JonB]

@JNBarchan said in QTest GUI getting started:

@jastmc
Since the example you quote uses:

mainWindow_ = new MainWindow();

why do you write

MyMainWindow_ = new MyMainWindow;

and then ask why it doesn't behave same?

Whoops? For my own edification, does stinky C++ allow you to omit the () in new Something and call a default constructor? parameterless constructor? complain if multiple constructors? or what??

[jastmc]

@SGaist OK. How do I make sure the class to be tested is built first?

Regards
Jas

[jsulm]

@jastmc Add it to SOURCES and HEADERS in your pro file.

[mrjj]

@JNBarchan
yes the new operator/compiler can construct an object if it can find
a default constructor (ctor). The ctor is a special function and and that is why () can be omitted even one often consider it just a function call.

https://stackoverflow.com/questions/620137/do-the-parentheses-after-the-type-name-make-a-difference-with-new

[jastmc]

@jsulm Thanks, that was part of it.

I then had to add

INCLUDEPATH += $$PWD/../MyApp/ \
                ../../build-MySolution-Desktop_Qt_5_7_0_GCC_64bit-Debug/MyApp/ \

to the MyTest.pro file because the next message was that it could not find the ui_mymainwindow.h file. So that solved it.

Regards,
Jas

[SGaist]

You are missing the FORMS variable in your .pro file.