The regression in the GroupForm was caused by the fact that the admin site

passes in the data to bind to the form as a positional argument rather than a

keyword argument. This meant that the data was being stuck into the

local_site_name argument rather than getting passed through to the base

class.
This change adds some unit tests to make sure we don't cause a similar problem

in the future. I also cleaned up some of the docstrings for adjacent tests to

match our conventions.

Ran the new tests. Before the fix to the forms, the new tests fail. After, they

run successfully.