Some NSX tests may be as follows: (Links may be helpful on howto and expected results)
@canero has provided some usefull tips for NSX component testing. Adding few more with a combination of NSX&VSAN.
From storage perspective for NSX component testing
> NSX Edges , DLR Control VM deployed on different datastore , if you have ECMP ,deploy the edges on different storage tiers and create a test case for lun failures . Also remember vsan datastore is a single entity so redeployment is required incase of vsan datastore failures.
> If you are protecting NSX manager using BCDR solution(2 site VSAN), you should test the BCDR solution . For eg : SRM with vSphere replication .Upon failure of a Primary NSX Manager and/or Universal Controller Cluster, the Cross vCenter NSX can be recovered without any loss of configuration data also test full failure scenario and check N-S traffic path when workloads are fully recovered at protected site.
> For VSAN with NSX , you can test disk,host,rack,DCI,Site failure scenarios based on your VSAN design and FTT.