diff --git a/tests/test_api.py b/tests/test_api.py
index b34b61db..7a61662a 100644
--- a/tests/test_api.py
+++ b/tests/test_api.py
@@ -101,6 +101,8 @@ class MockRequest(object):
     def makefile(self, *args, **kwargs):
         return IO(self.request)
 
+    def sendall(self, *args, **kwargs):
+        pass
 
 class MockRestApiServer(RestApiServer):