prog.py

#!/usr/bin/env python
"""
Usage:
  prog.py -h | -v
  prog.py [-f FILE -F FORMAT | -u URL [-V] -F FORMAT]

Options:
  -h --help     help
  -v --version  version
  -f FILE       file
  -F FORMAT     format
  -u URL        url
  -V --verbose  verbose
"""

from docopt import docopt


if __name__ == '__main__':
    arguments = docopt(__doc__, version='Prog 0.1')
    print(arguments)

test_prog.py

#!/usr/bin/env python3
from itertools import combinations
from subprocess import call, DEVNULL, STDOUT

def powerset(seq):
    return (c for r in range(len(seq) + 1) for c in combinations(seq, r))

for args in map(list, powerset("-f a -F b -u c -V d --unknown".split())):
    rc = call(['./prog.py'] + args, stdin=DEVNULL, stdout=DEVNULL, stderr=STDOUT)
    print("{} {}".format("pass" if rc == 0 else "fail", args))

"""$ grep pass
pass []
pass ['-f', 'a', '-F', 'b']
pass ['-f', 'a', '-F', '-u']
pass ['-f', 'a', '-F', 'c']
pass ['-f', 'a', '-F', '-V']
pass ['-f', 'a', '-F', 'd']
pass ['-f', 'a', '-F', '--unknown']
pass ['-F', 'b', '-u', 'c']
pass ['-F', 'b', '-u', '-V']
pass ['-F', 'b', '-u', 'd']
pass ['-F', 'b', '-u', '--unknown']
pass ['-F', 'b', '-u', 'c', '-V']
"""