It had tests at first, for internal functions (bencoding related mostly). Now that only the API is accessible I don't see the point for tests. What would the test do? Download a file, and checksum it? you'd depend on access to the network here. Another idea would be to use a local tracker, spawned for the tests. Not really helpful either...

I wanted to have tests at first, but the simplest way to test is to do it manually at this point.

But I must admit I suck at writing tests, so if you have an idea, please speak up! :)