Alert when there is no SNMP trap

Alert when there is no SNMP trap

We have an environment monitoring device that we have added into OpManager.  (IMS4000 by Sensaphone)  We run a generator test each week and when it runs it generates an SNMP trap.  I want to be notified when the generator did not run.  Can I set up a workflow to notify me when an SNMP trap is not generated?
 
I can set up an email to notify me when a trap occurs, but the issue is that when the generator does not run it doesnt send a trap.  Therefore I need to specify that there should be a trap during a specified time and to alert me when there is no trap during this time.
 
Thanks!

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