[issue18258] Fix test discovery for test_codecmaps*.py

[R. David Murray]

R. David Murray added the comment:

It enables the resource when the tests are run via unittest.  (That is, it is equivalent to specifying '-u urlfetch' when running regrtest.)

----------
nosy: +r.david.murray

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18258>
_______________________________________