Fix tests

wfb_ng/tests/test_twisted.py

@@ -25,7 +25,7 @@ def test_timer_resolution(self):
 
         for i in range(iters):
             ts = time.time_ns()
-            yield task.deferLater(reactor, delay)
+            yield task.deferLater(reactor, delay, lambda: None)
             latency = time.time_ns() - ts - delay * 1e9
             sum += latency
             sqsum += latency**2