I had the test and oath on the same day in Montreal earlier this month.
In the test notification, there's an additional sheet that states if you pass the test and your application is approved, then the oath ceremony takes place 2 hours later.
In the 2014 spreadsheet, you can see a few applicants have the same test and oath dates:
http://bit.ly/citizenship-ca
Here's our experience:
http://www.canadavisa.com/canada-immigration-discussion-board/january-2014-citizenship-application-timeline-t179000.0.html;msg4133836#msg4133836