Unable to create C++ google test for the C++ class

Bharath kumar

Hi Team,

I got one C++ project. Where I have to write C++ google test unit testing for each file, function's and conditions to improve coverage. But the problem is I am able to write the gtest for non qt functions. If any function is having Qt Widget let's say In my case QTreeView used. I am unable to write the gtest for that class It is giving an error like.

QWidget: Must construct a QApplication before a QWidget
WARNING: xml report not find. for: bld_local/TEST_controller

Please do help .Thanks

Christian Ehrlicher

The error tells you what to do - create a QApplication object before you create your widgets.

Bharath kumar

Yes error tells that create a QApplication before QWidgets. But In my case we have created each test_xxx.cpp file for each source file and we are creating test cases in that. But here I am stuck how and where should I create QApplication object.
For Ex my class is:

#include "gtest/gtest.h"
#include "gmock/gmock.h"

using::testing::test;
using::testing::_;

class ControllFixture: public testing::Test
{
};
TEST_F(ControllFixture, TestValidNode)
{
}

Christian Ehrlicher

@Bharath-kumar said in Unable to create C++ google test for the C++ class:

But here I am stuck how and where should I create QApplication object.

Before you create any widget.

Bharath kumar

#include "gtest/gtest.h"
#include "gmock/gmock.h"
#include <qt5/QtWidgets/QApplication>

using::testing::test;
using::testing::_;

class ControllFixture: public testing::Test
{
};
TEST_F(ControllFixture, TestValidNode)
{
   QApplication app(int argc,char **argv);
   QTreeView* m_treeView = new QTreeView();
   //QListView cm_list_view;
	//-----------------
	
	app.quit();
}

same problem. Build is successful but test case is failing:
[ RUN ] ControllFixture.TestValidNode
QWidget: Must construct a QApplication before a QWidget
WARNING: xml report not found for: bld_local/TEST_ControllFixture
Error Summary:
Program exited with error code: 6
Run 'man 7 signal' for a description of exit codes

Christian Ehrlicher

See https://doc.qt.io/qt-6/debug.html : set QT_FATAL_WARNING, run your app in the debugger and see where you create a QWidget before a QApplication.