add tests for using single flags
add tests for using single flags

In order to check whether the flags itself also work on their own, tests have been added to check for every single flag.

ElektraInitiative/libelektra,ElektraInitiative/libelektra,petermax2/libelektra,petermax2/libelektra,mpranj/libelektra,mpranj/libelektra,mpranj/libelektra,petermax2/libelektra,petermax2/libelektra,ElektraInitiative/libelektra,mpranj/libelektra,petermax2/libelektra,ElektraInitiative/libelektra,mpranj/libelektra,mpranj/libelektra,ElektraInitiative/libelektra,petermax2/libelektra,ElektraInitiative/libelektra,petermax2/libelektra,ElektraInitiative/libelektra,mpranj/libelektra,ElektraInitiative/libelektra,petermax2/libelektra,mpranj/libelektra,ElektraInitiative/libelektra,mpranj/libelektra,petermax2/libelektra,ElektraInitiative/libelektra,ElektraInitiative/libelektra,mpranj/libelektra,mpranj/libelektra