version_text_test.py

#!/usr/bin/env python3

import itertools
import subprocess


def main():

    fmt_pieces = ('', '.', '{:01d}', '{:01d}.', '{:02d}', '{:02d}.')

    # All possible combinations of four components.
    fmts = [''.join(p) for p in itertools.product(fmt_pieces, repeat=3)]

    # Filter out formats with adjacent numbers.
    is_bad = lambda s: s.find('}{') != -1
    fmts = itertools.filterfalse(is_bad, fmts)

    test_values = (0, 1, 5, 9, 10, 11, 20, 50, 99, 100, 101)
    versions = list(itertools.product(test_values, repeat=3))

    version_strings = (f.format(*v) for f in fmts for v in versions)
    version_strings = (key for key, group in
            itertools.groupby(sorted(version_strings)))
    for vs in version_strings:
        print(vs, '->', subprocess.check_output(['./version_text', vs]))


if __name__ == '__main__':
    main()