Test for sortedness of all_timezones and common_timezones is missing

[Tim Landscheidt]

Fedora replaces the hard-coded list of timezones with one dynamically read from /usr/share/zoneinfo (cf. https://src.fedoraproject.org/rpms/pytz/blob/master/f/pytz-zoneinfo.patch). This breaks the promise in python-tz's README.txt that all_timezones and common_timezones are sorted, i. e. for example on Fedora 25:

| [tim@passepartout ~]$ python2 -c 'from pytz import all_timezones, common_timezones; print all_timezones == sorted(all_timezones), common_timezones == sorted(common_timezones)'
| False False
| [tim@passepartout ~]$ python3 -c 'from pytz import all_timezones, common_timezones; print(all_timezones == sorted(all_timezones), common_timezones == sorted(common_timezones))'
| False False
| [tim@passepartout ~]$

This is not python-tz's fault, but it would be helpful if the test suite would assert that all_timezones == sorted(all_timezones) && common_timezones == sorted(common_timezones) so that this becomes a regression easier to detect.

[Dmitry Shachnev (mitya57)]

You want the upstream project, not Ubuntu.