Unit test recommended structure multi-test

[matthewturner]

Thanks @ivankravets, I managed to work out what I was doing wrong.

I had too many levels of nesting:

• tests
  • desktop
    • test_analyzer
      • test_analyzer.cpp
    • test_endstop
      • test_endstop.cpp

When I removed the desktop level, everything worked as expected:

• tests
  • test_analyzer
    • test_analyzer.cpp
  • test_endstop
    + test_endstop.cpp