def test_add_sub_parser(self):
# setting up required parsers
parser = argparse.ArgumentParser()
parent = argparse.ArgumentParser(add_help=False)
subparsers = parser.add_subparsers()
# adding percentiles subparser
EvalChannels._add_subparser(subparsers, parent)
# testing parser
cargs = 'EvalChannels x 10.0'.split()
args = parser.parse_args(cargs)
cargs = 'chans z 5'.split()
args = parser.parse_args(cargs)
#
assert args.axis == 'z'
assert args.thresh == 5.0
#
cargs = 'chans y 5'.split()
with pytest.raises(SystemExit):
args = parser.parse_args(cargs)
