How to structure project while unit-testing Qt app by QTestLib

Question

I got my Qt project and I\'m using Qt Creator. I want to unit-test all my code.
However I\'m quite new at QTestLib framework but everyone recommended it for testing Qt-b

Answer 1

I use this approach: http://xilexio.org/?p=125

Namely, place a test config in the single .pro file that builds everything. File hierarchy:

myproject.pro
src/
    Example1.cpp
    Example2.cpp
    Example1.h
    Example2.h
test/
    ExampleTest.cpp
    ExampleTest.h

myproject.pro file:

QT += #needed modules

CONFIG += qt c++11

HEADERS += \
    src/Example1.h \
    src/Example2.h

SOURCES += \
    src/Example1.h \
    src/Example2.h

test{
    message(Configuring test build...)

    TEMPLATE = app
    TARGET = myapptests

    QT += testlib

    HEADERS += \
        test/ExampleTest.h

    SOURCES += \
        test/ExampleTest.cpp
}
else{
    TEMPLATE = lib
    TARGET = myapp

    CONFIG += plugin

    TARGET = $$qtLibraryTarget($$TARGET)
}

In my example, I'm building a plugin library, but the method should work for an app as well. In the case of an app, it is likely that SOURCES -= src/main.cpp is needed under the else clause, plugin libraries don't have it. If this is not done, the main() of the app will clash with the main() of the unit tests.

ExampleTest.cpp looks like the following:

#include "ExampleTest.h"

void ExampleTest::exampleTest(){
    //Do the tests
}

QTEST_MAIN(ExampleTest)

ExampleTest.h looks like the following:

#include 

class ExampleTest : public QObject {
Q_OBJECT

private slots:
    void exampleTest();
};

To build the project tests, in a separate directory than the regular build, run:

qmake path/to/myproject.pro "CONFIG += test"