Improve tests based on PR feedback
Improve tests based on PR feedback

Based on fearphage's feedback in 1031 an uneeded
test was deleted and the clarity of another was improved.

mroderick/Sinon.JS,Khan/Sinon.JS,jishi/sinon,mroderick/Sinon.JS,cjohansen/Sinon.JS,Khan/Sinon.JS,andpor/sinon,andpor/sinon,andpor/sinon,mroderick/Sinon.JS,fatso83/Sinon.JS,Khan/Sinon.JS,jishi/sinon,fatso83/Sinon.JS,fatso83/Sinon.JS,cjohansen/Sinon.JS,cjohansen/Sinon.JS,jishi/sinon