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
HistogramRange._add_subparser(subparsers, parent)
# testing parser
cargs = 'HistogramRange 10'.split()
args = parser.parse_args(cargs)
#
assert args.num_bins == 10
assert args.range == [1.0, 99.0]
#
cargs = 'histrng 13 -r 0 100'.split()
args = parser.parse_args(cargs)
#
assert args.num_bins == 13
assert args.range == [0.0, 100.0]
#
cargs = 'histrng 7 --range 5 95'.split()
args = parser.parse_args(cargs)
#
assert args.num_bins == 7
assert args.range == [5.0, 95.0]
