[web/test] Modernize unittest_propertysheet.py
- remove call to os.makedirs in global scope
- fold CACHEDIR as an instance attribute
- bonus: use unittest directly instead of lgc.testlib
# -*- coding: utf-8 -*-
# copyright %(year)s %(author)s, all rights reserved.
# contact %(author-web-site)s -- mailto:%(author-email)s
#
%(long-license)s
"""%(distname)s entity's classes"""