require yaml module for tests
    
    addressing:
    ==================================== ERRORS ====================================
    ___________ ERROR collecting tests/test_logic/test_modules_logic.py ____________
    ImportError while importing test module '/builddir/build/BUILD/copr-frontend-1.139.git.62.15ae232c/coprs_frontend/tests/test_logic/test_modules_logic.py'.
    Hint: make sure your test modules/packages have valid Python names.
    Traceback:
    tests/test_logic/test_modules_logic.py:1: in <module>
        import yaml
    E   ModuleNotFoundError: No module named 'yaml'