Improve testing

[acs]

Now we can have:

• Unit testing for memory pipeline
• Dummy testing render for unit testing also the rendering process
• Integration testing with the mc render (as it is now)

[acs]

Probably we must iinclude also coverage of the tested code.

[acs]

But this is something we are doing as the project evolves, so probably, we can survive with the current tests and improve them as new features and new bugs are found. So let's work in an incremental way. I leave this ticket open in order to be sure to increment the testing status in each iteration of the ROADMAP.