Rewrite ShrinkUrl's tests to ease testing of new services.
Rewrite ShrinkUrl's tests to ease testing of new services.

Signed-off-by: James Vega <91ae71a1168cea0b65ac9975da69d5a7753116be@users.sourceforge.net>

frumiousbandersnatch/supybot-code,Ban3/Limnoria,mazaclub/mazabot-core,jeffmahoney/supybot,Ban3/Limnoria,prashantpawar/supybot-rothbot,haxwithaxe/supybot,mazaclub/mazabot-core,raboof/supybot,ProgVal/Limnoria-test,buildbot/supybot,ProgVal/Limnoria-test