SNMP - ifAdminStatus - Up, Down, Testing

[jjustice]

Trying to understand SNMP-ifAdminStatus level of 3, which is listed as 'testing'.  We are all familar with setting the admin status to either up or admin down with the the 'shut' or 'no shut' commands, but what is it that would list an SNMP ifAdminStatus of 'testing'?  Any help is appreciated

http://tools.cisco.com/Support/SNMP/do/BrowseOID.do?local=en&translate=Translate&objectInput=ifAdminStatus#oidContent

Object	ifAdminStatus
OID	1.3.6.1.2.1.2.2.1.7
Type	INTEGER
Permission	read-write
Status	current
Values	1 : up 2 : down 3 : testing
MIB	IF-MIB ;   -   View Supporting Images http://tools.cisco.com/Support/SNMP/do/BrowseOID.do?local=en&translate=Translate&objectInput=ifAdminStatus
Description	"The desired state of the interface. The testing(3) state indicates that no operational packets can be passed. When a managed system initializes, all interfaces start with ifAdminStatus in the down(2) state. As a result of either explicit management action or per configuration information retained by the managed system, ifAdminStatus is then changed to either the up(1) or testing(3) states (or remains in the down(2) state)."

[graham smart]

I can only assume it goes into that state when a line card comes online and the ports are run though the inital testing/diags before coming online?