./should --no-f demo/cal.should

$ Do not launch any 'f' test
0:TODO


./should --no-a demo/cal.should

$ Do not launch any 'a' test
0:ALLOW


./should --only-f demo/cal.should

$ Launch only the two 'f' tests
r:Summary.*TODO:2
r:Summary.*total:2


./should --only-a demo/cal.should

$ Launch only the unique 'a' test
r:Summary.*failed-but-ALLOW:1
r:Summary.*total:1