scaffold: yml files for tests are missing

ruby 1.9.3p286 (2012-10-12 revision 37165) [x86_64-darwin10.8.0] rails 3.1.3

Probably it is my misunderstanding but doesn't scaffold generate test/fixtures/model_name.yml file automatically?

Normally I use scaffold for creating many models, but test/fixtures folder is empty. Not mention I have certainly executed rake db:migrate command and the application is working correctly as I intended.

Since the application is getting complicated, I need to run test scripts. But I have now realized test/fixtures and test/functional are empty. Maybe I have set up the application wrong somehow.

Can you guess what went wrong? or is there anyway to regenerate necessary files for tests?

Thanks

soichi