Testing Pipelines

this is a great resource to learn how to instrument your own project to test PipeLines...
http://csdevwiki.codeplex.com/SourceControl/changeset/view/28029#

if your CS implementation is correct, you will be able to test 95% of your business logic testing your pipelines, testing pipelines, it could be very useful to verify that a new discount is interacting correctly with the existing ones, and that's a way to automate your discount testing procedure.