diff -r 3abae898011d -r 40cabcdcd2be samples/openfixed/test/org/apidesign/openfixed/CalculatorBase.java
--- a/samples/openfixed/test/org/apidesign/openfixed/CalculatorBase.java	Sun Mar 20 20:52:33 2011 +0100
+++ b/samples/openfixed/test/org/apidesign/openfixed/CalculatorBase.java	Thu Oct 30 21:30:10 2014 +0100
@@ -46,6 +46,7 @@
                 events = new ArrayList<ModificationEvent>();
             }
             events.add(ev);
+            notifyAll();
         }
         
         public synchronized List<ModificationEvent> assertEvents(