Test cases for SNMP Alerts support in CloudStack are here : 

Reference jira id and QA subtask:

https://issues.apache.org/jira/browse/CLOUDSTACK-680

https://issues.apache.org/jira/browse/CLOUDSTACK-837

FS : https://cwiki.apache.org/confluence/display/CLOUDSTACK/FS+for+Integrating+CS+alerts+via+SNMP+to+external+management+system