diff -rNu test_server-0.0.31.old/test_server/server.py test_server-0.0.31/test_server/server.py

--- test_server-0.0.31.old/test_server/server.py	2018-05-05 20:01:28.000000000 +0200

+++ test_server-0.0.31/test_server/server.py	2018-11-01 21:58:26.331632215 +0100

@@ -227,7 +227,14 @@

 class TestServer(object):

-    def __init__(self, port=0, address='127.0.0.1'):

+    def __init__(self, port=0, address='127.0.0.1', engine=None):

+        if engine:

+            # be nice to expectations of old API

+            import warnings

+            text = "value of parameter engine is ignored with version 0.0.31"

+            text += " and param might get removed later"

+            warnings.warn(text, DeprecationWarning)

+

         self.request = {}

         self.response = {}

         self.response_once = {}