fix tests

tests/coverage_server.py

@@ -1,11 +1,11 @@
 #!/usr/bin/env python
 
-import tornado.ioloop
-import tornado.web
-import urllib
+if __name__ == '__main__':
+    import tornado.ioloop
+    import tornado.web
+    import urllib
 
-
-class MainHandler(tornado.web.RequestHandler):
+    class MainHandler(tornado.web.RequestHandler):
         def get(self):
             with open('/tmp/shadowsocks-coverage', 'rb') as f:
                 coverage = f.read().strip()
@@ -14,10 +14,10 @@ class MainHandler(tornado.web.RequestHandler):
                                '?style=flat') %
                               urllib.quote(coverage))
 
-application = tornado.web.Application([
+    application = tornado.web.Application([
         (r"/shadowsocks", MainHandler),
-])
+    ])
 
-if __name__ == "__main__":
+    if __name__ == "__main__":
         application.listen(8888, address='127.0.0.1')
         tornado.ioloop.IOLoop.instance().start()