Service Bus Disaster swap exception type and how to do a drill

Hello,

We are integrating disaster recovery to our solution based on service bus. Following the Active-Passive pattern as implemented in this repo: https://github.com/Azure/azure-service-bus/blob/master/samples/DotNet/Microsoft.ServiceBus.Messaging/GeoReplication/SenderPassiveReplication/Program.cs#L59

Our question is, what type of exception should be the condition to perform the swap?

Is there a way that we can simulate the outage to test the solution?

Thank you.

Jaroslav