test_tornado_app.py

# a fully-functional Python unittest example where we have a
# Tornado web application that is being tested:
#
# taken from https://groups.google.com/forum/#!topic/python-tornado/hnz7JmXqEKk
# originally posted by Jeremy Whitlock

import tornado.httpserver 
import tornado.httpclient 
import tornado.ioloop 
import tornado.web 
import unittest 

class MainHandler(tornado.web.RequestHandler): 
    def get(self): 
        self.write('Hello, world') 

class TestTornadoWeb(unittest.TestCase): 
    response = None 

    def setUp(self): 
        application = tornado.web.Application([ 
                (r'/', MainHandler), 
                ]) 

        http_server = tornado.httpserver.HTTPServer(application) 
        http_server.listen(8888) 

    def handle_request(self, response): 
        self.response = response 

        tornado.ioloop.IOLoop.instance().stop() 

    def testHelloWorldHandler(self): 
        http_client = tornado.httpclient.AsyncHTTPClient() 
        http_client.fetch('http://localhost:8888/', 
self.handle_request) 

        tornado.ioloop.IOLoop.instance().start() 

        self.failIf(self.response.error) 
        self.assertEqual(self.response.body, 'Hello, world') 

if __name__ == '__main__': 
    unittest.main()