Adds a few tests.

git-svn-id: http://svn.redmine.org/redmine/trunk@13695 e93f8b46-1217-0410-a6f0-8f06a7374b81
Rescue RecordNotSaved in #save_with_content.

git-svn-id: http://svn.redmine.org/redmine/trunk@13696 e93f8b46-1217-0410-a6f0-8f06a7374b81