Added tests that conversion to our own timezone is always an identity, and that conversion to "timezone" None is the same as stripping the tzinfo member.
Added tests that conversion to our own timezone is always an identity,
and that conversion to "timezone" None is the same as stripping the
tzinfo member.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator