Test if thesis is vetted/deleted and mail is sent in
the accepted/refused case.

This does not work yet. I wrote some failing tests, but while
I was doing that, I came to the conclusion that I want to make
the route of the get request different from the route of the post
request.

This function helps to create form data from models.
See example given.

test_forms.py, test_models.py, test_views.py, as per
recommendation of the two scoops book.