(chore) Add integration testing.

[kounkou]

Description

This will contribute to fixing #58 and contains :

• Initial testing infrastructure setup

Tests

I launched the following command inside tests directory :

bash run.sh

Results :

********* Start testing of QmlTests *********
Config: Using QtTest library 5.15.13, Qt 5.15.13 (x86_64-little_endian-lp64 shared (dynamic) release build; by Clang 15.0.0 (clang-1500.1.0.2.5) (Apple)), osx 13.6
PASS   : QmlTests::initTestCase()
QWARN  : QmlTests::testInit() QtWebEngine::initialize() called with QCoreApplication object already created and should be call before. This is depreciated and may fail in the future.
QWARN  : QmlTests::testInit() qt.qpa.fonts: Populating font family aliases took 172 ms. Replace uses of missing font family "Noto Color Emoji" with one that exists to avoid this cost.
PASS   : QmlTests::testInit()
PASS   : QmlTests::testWelcomePage()
PASS   : QmlTests::cleanupTestCase()
Totals: 4 passed, 0 failed, 0 skipped, 0 blacklisted, 436ms
********* Finished testing of QmlTests *********