rotation unit tests for rotate to flushed out better.

Change-Id: I3cc8227e16c6884bdda9f9374bef54caf2363bdc
Reviewed-on: http://www.matthewh.me/gerrit/18
Reviewed-by: Matthew Hoggan <mehoggan@gmail.com>
Tested-by: Matthew Hoggan <mehoggan@gmail.com>