Same problem here. And I think this is a bug. In my point of view, if I’m publishing the system in a shared host environment and I have table prefixes I will need to rename the whole set of files for the fixtures to be loaded in the environment.
I have a problem testing my modules too. Somehow I felt that testing in Yii framework is somewhat difficult and unencouraged. I place fixtures and unit test scripts under my module in a ‘tests’, and ‘tests/fixtures’ folder, which is the same structure with ‘protected/tests’. I run phpunit inside my modules tests folder, but the fixtures doesn’t want to load. Anybody can help me?