Fix dependencies for test code and execute them

[poush]

In the recent refactor to make the app executable, I disconnected the test suite and removed all of its dependencies. The task is to put all the dependencies again and execute the existing test cases.

This should be pretty straight forward and you can check the git history for the reference. You can see in diff what is changed.

[asciarp08]

Hey!
Can you tell more about the test suite you have mentioned?