def test_zero_position_6(): assert (main(['-f', '1,-4:0']))
def test_zero_position_5(): assert (main(['-f', '1,:0']))
def test_zero_position_4(): assert (main(['-f', '1,0:5']))
def test_zero_position_1(): assert (main(['-f', '0']))
def test_main_too_many_options(): assert main(['-b', '-1', '-f', '-1'])
def test_main_no_args(): assert main([])