set and frozenset unit tests?

[Jacob Page]

I have released interval-0.2.1 at 
http://members.cox.net/apoco/interval/.  IntervalSet and 
FrozenIntervalSet objects are now (as far as I can tell) functionality 
equivalent to set and frozenset objects, except they can contain 
intervals as well as discrete values.

Though I have my own unit tests for verifying this claim, I'd like to 
run my code through actual set and frozenset unit tests.  Does any such 
code exist?  Is it in pure Python?  If so, where can it be obtained?

Oh, and again, I'd really appreciate additional feedback on the module, 
especially related to design, if you've got any.  My goal for this 
project is to make the classes built-in-data-type quality.

--
Jacob