1 files changed, 3 insertions, 2 deletions
diff --git a/tests/utils.py b/tests/utils.py
index bf7a31ff9e..dfbee5c23a 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -239,9 +239,10 @@ class MockClock(object):
     def looping_call(self, function, interval):
         pass
 
-    def cancel_call_later(self, timer):
+    def cancel_call_later(self, timer, ignore_errs=False):
         if timer[2]:
-            raise Exception("Cannot cancel an expired timer")
+            if not ignore_errs:
+                raise Exception("Cannot cancel an expired timer")
 
         timer[2] = True
         self.timers = [t for t in self.timers if t != timer]