Typo - Existant -> Existent

[Sardtok]

Just a minor typo in the test class.

[juleswhite]

I really appreciate you catching this.

I will definitely merge this change after the current course ends. The change affects the naming of tests cases and will require updates to our auto-grading service in the cloud (so that it generates the updated feedback messages) as well as everyone that has checked out the assignment. If we update now, there is the potential that folks may see a slight mismatch between their local feedback and the official feedback (I know it would be very minor) and get confused. It is easier to accept that I made a spelling mistake and live with it until the end of the course than to roll out a change and potentially cause confusion.

[Sardtok]

No problem. I figured the rubric annotations might make it a problem to merge, but thought maybe it was early enough still.