The CMF testing is based on the standard Python unit test module.
The creation of unit tests in python files follows a specific naming pattern, the default being
test*.py, for example
test_model.py. Typically they should be in the same folder as the model they test.
In order for the test discovery to load your tests, they must be in a folder with a
__init__.pyfile, so create a
__init__.pyfile in your models folder.