how to test a function calculator( QWidget *parent)

[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.

[jsulm]

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

but it shows some error

Please post the error

[shravan_121]

@jsulm
Test.Cpp:
#include <QtTest/QtTest>
#include<QTest>
#include<calculator.h>
#include<button.h>
#include<QtWidgets>
#include<QDebug>
#include<QApplication>
class test1 : public QObject
{
Q_OBJECT

public:
test1();
~test1();

private slots:
void test_case1();
void test_case2();

private:

Calculator *mcalculator;

};

test1::test1()

{

mcalculator = new Calculator(); //ERROR

}

[shravan_121]

#include <QtTest/QtTest>
#include<QTest>
#include<calculator.h>
#include<button.h>
#include<QtWidgets>
#include<QDebug>
#include<QApplication>
class test1 : public QObject
{
Q_OBJECT

public:
test1();
~test1();

private slots:
void test_case1();
void test_case2();

private:

Calculator *mcalculator;

};

test1::test1()

{

mcalculator = new Calculator();//error

}

[shravan_121]

QTEST_APPLESS_MAIN(test1)

#include "tst_test1.moc"

[JonB]

@shravan_121
So the compiler just reports "Error" on some line? It does not have anything further than that, it just goes "Error" with no explanation? Because obviously if it did output a whole line of explanation with the error message you would paste that here when asking for help, and you have been asked for the error, wouldn't you?

[shravan_121]

@JonB Qwidget:Must Create a Qapplication before Qwidget

[jsulm]

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

QTEST_APPLESS_MAIN

Why?!
As @SGaist suggested use QTEST_MAIN