It would be nice if there were some test-cs* cmdlets that could be used for coexistence during migration scenarios, such as OCS 2007 R2 and Lync 2010 migrations to 2013.
Right now, if you run this cmdlet, there is no output to the console unless you use -verbose. And even then, it's limited. It would be nice if there was standard test cmdlet output. It would be really nice if this cmdlet also supported pipelining, such as Get-CsKerberosAssignment | Test-CsKerberosAssignment.