Re: Question about code in test_email/test_message.py

> In that file there is a variable named message_params that is initialized with about 15 different sets of test data, in class TestEmailMessageBase, but is never referenced again. I even grepped for the variable name in all test py files to confirm that it isn't somehow imported somewhere.
>
> Is there something about the test framework that uses that automatically? I'm hesitant to add any testing code for my issue if I'm missing something so fundamental.

Have a look at the "parameterize" decorator (in __init__.py in the
same directory). It looks for things that .endswith('_params').