Abstracted out an assertError method for testing specs.
Abstracted out an assertError method for testing specs.

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