how to test a function calculator( QWidget *parent)

shravan_121

Every time i call this function calculator(QWidget parent) for testing it shows error :undefined reference to Class::Calculator(QWidget).how can i call this function for testing

Pablo J. Rogina

@shravan_121 help us helping you by showing your code... both the class under testing and the test(s) please

VRonin

@shravan_121 said in how to test a function calculator( QWidget *parent):

undefined reference to Class::Calculator(QWidget)

Did you forget to give a body to the method?

SGaist

Hi,

Beside what my fellows already wrote, are properly passing a pointer to a widget for parent ? The error seems to show that you are trying to pass by value rather than pointer.

shravan_121

This is the code:
Button.h:

class Button : public QToolButton
{
    Q_OBJECT

public:
    explicit Button(const QString &text, QWidget *parent = 0);

calculator.h:

class Calculator : public QWidget
{
    Q_OBJECT

public:
    Calculator(QWidget *parent = 0);

calculator.cpp:

Calculator::Calculator(QWidget *parent)
    : QWidget(parent)
{}

Button.cpp:

Button::Button(const QString &text, QWidget *parent)
    : QToolButton(parent)

Main.cpp:

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    Calculator calc;
    calc.show();
    return app.exec();
}

How can I test this calculator function

jsulm

@shravan_121 Did you add the calculator.cpp to your pro file?

shravan_121

Test.pro:
QT += testlib
QT += gui
QT +=widgets

CONFIG += qt console warn_on depend_includepath testcase
CONFIG -= app_bundle

TEMPLATE = app

INCLUDEPATH = C:/Qt/Qt5.12.6/Examples/Qt-5.12.6/widgets/widgets/calculator
DEPENDPATH = C:/Qt/Qt5.12.6/Examples/Qt-5.12.6/widgets/widgets/calculator

SOURCES += tst_test1.cpp \

calculator.pro:
QT += widgets

HEADERS = button.h
calculator.h
SOURCES = button.cpp
calculator.cpp
main.cpp

install

target.path = $$[QT_INSTALL_EXAMPLES]/widgets/widgets/calculator
INSTALLS += target

J.Hilk

@shravan_121 What are your includes for those classes ?

shravan_121

button.cpp:

#include <QtWidgets>
#include "button.h"

calculator.cpp:

#include <QtWidgets>
#include <cmath>
#include "button.h"
#include "calculator.h"

main.cpp:

#include <QApplication>
#include "calculator.h"

shravan_121

Test.cpp:
#include<QTest>
#include<calculator.h>
#include<button.h>
#include<QtWidgets>
#include<QDebug>

class test1 : public QObject
{
Q_OBJECT

public:
test1();
~test1();
private slots:
void test_case1();
void test_case2();
private:
Calculator *mcalculator;

};

aha_1980

@shravan_121

as @jsulm already said, you must add calculator.cpp to your Test.pro file.

Regards

shravan_121

After including calculator.cpp i am getting error:QWidget: Must construct a Qapplication before a QWidget. And Thank You all of you for helping me.

JonB

@shravan_121
So you need to obey the message, exactly as it says. You need to construct your QApplication before you can access QWidgets. What else to say?

shravan_121

@JonB Actually I don't know how this works and as i am new to qt I don't know how to construct QApplication

JonB

@shravan_121
Follow any example anywhere of how to create a basic Qt (widgets) application. Reading the docs/examples is a good place to start. Without knowing that you won't get anywhere.

shravan_121

I have the application created but for testing that application I am facing this error.In that actual application Application is constructed in the main function.

SGaist

Please read the QtTest module tutorials they show how to write unit tests.

shravan_121

I have gone through the document about unit testing.Now I have some idea on inbuilt qttest functions.But I need to clear the error of QApplication construction in QtTest application.Can Any one help me solving this.

SGaist

Did you add the QTEST_MAIN related lines as described at the bottom of the GUI related tutorials ?

shravan_121

@SGaist I tried It but it shows some error I don't know how can you give me a sample of it
how to add QApplication related lines because i am unclear about the concept.