Name of the pattern that pyunit uses to identify test cases and test methods

pyunit works by looking for classes subclassing unittest.TestCase and methods starting with the string test.

What is that pattern called? Is it a form for the decorator pattern? Discovery? Introspection? Enumeration?

I know other systems use similar as well. For example, I think JavaBeans uses a similar naming pattern for exposing what they can do, rather than having to explicitly call a method for a list of stuff.