Fail Over with no Access to Production Site - Failback without bringing back changes

i have a producrion site and DR L2 ( same ip address when Fail Over).

i need to do  a real test, this way.

1 disconnect the Two Prod And DR

2 bring up the DR when No change In The Production Site ( All Is Online)

3 Do a Test At the Dr To All Servers

4 Stop All At the DR

5 connect Back The Prod to the DR

6 Syn back The Prod To DR.

Thanks for working Answer.