nodejs/express testing

Question

im writing an app with express.

main file is called server.js

one of the objects is var app = express.createServer(express.logger(), express.bodyDecoder());

then i have app.get("/",function(req, res){ res.send("Running"); }

how do i use expresso, [or any other testing framework for that matter], to test the routes output?

I looked at the expresso site, but couldn't figure out how to get it to all work together, is it possible if someone gave me a short example? Thanks!