Bug 1075510 - Add test to verify the Notification for E-mail is displaye...

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Any chance this'll fail due to another unexpected notification (system update, past test that didn't clear it, etc?) 

If so, might be worth getting the number of notifications during setup and looking for that+1 instead of a hardcoded 1. Alternately, maybe assert somewhere beforehand that notifications == 0, since it's an assumption being made.