Folder structure looks like this (screenshot):

*.pro contains:

CONFIG += warn_on qmltestcase

TEMPLATE = app

DISTFILES += \
    tst_idontknow.qml

SOURCES += \
    main.cpp \
    tst_Settings.cpp

INCLUDEPATH += ../<path to external folder>

main.cpp conatins:

#include <QtQuickTest/quicktest.h>

QUICK_TEST_MAIN(example)

tst_Settings.cpp contains:

#include <QObject>
#include <QtQuickTest>
#include "App/UserInterface/Settings.h"
#include "App/UserInterface/ErdBridge.h"

class TestSettings: public QObject
{
    Q_OBJECT
public:
    TestSettings();
    ~TestSettings();

    void test_getTimeFormat24hour();
private:
    ErdBridge *erdBridget;
    Settings *settings;

};

TestSettings::TestSettings()
{

    settings = new Settings(erdBridget, nullptr);
}

TestSettings::~TestSettings()
{
    delete settings;
    delete erdBridget;
}

void TestSettings::test_getTimeFormat24hour()
{
    QCOMPARE(settings->getTimeFormat24hour(), false);
}

QUICK_TEST_MAIN_WITH_SETUP(example, TestSettings)

#include "tst_settings.moc"

tst_idontknow.qml has a generated code, which will always pass. When I run the code I get the following error:

..\Test_cook-ui-modular-qt\tst_Settings.cpp:39:10: fatal error: tst_settings.moc: No such file or directory
   39 | #include "tst_settings.moc"
      |          ^~~~~~~~~~~~~~~~~~
compilation terminated.
mingw32-make[1]: *** [Makefile.Debug:1030: debug/tst_Settings.o] Error 1
mingw32-make[1]: *** Waiting for unfinished jobs....
mingw32-make[1]: Leaving directory 'C:/Users/gollaha/Code/cook-ui-modular-qt/build-Test_cook-ui-modular-qt-Desktop_Qt_6_2_2_MinGW_64_bit-Debug'
mingw32-make: *** [Makefile:45: debug] Error 2
11:29:06: The process "C:\Qt\Tools\mingw900_64\bin\mingw32-make.exe" exited with code 2.
Error while building/deploying project Test_cook-ui-modular-qt (kit: Desktop Qt 6.2.2 MinGW 64-bit)
When executing step "Make"

Not sure why I am getting this error. Any help would be appreciated.