Add unit tests for Config Forms, and fix a 404 error.
Review Request #9624 - Created Feb. 12, 2018 and submitted
This introduces a series of Python unit tests for
ConfigPage, covering the initial states, HTTP
responses, and basic functionality. These will help catch regressions
and help with porting to newer versions of Django.
It also fixes a
Http404that was being returned instead of raised.
Unit tests pass.