In reply to NB_A:
Just use it!
I think DUT, which comes from design team, is dominant and TB is secondary.
So as a verif engineer you should try to use as much as possible DUT terminology.
This will help you to maintan your TB also easily communicate with design team.
However sometimes you need to override or add more enums in design team code. Than you can use TB_* prefix for always recognize your defines.
But general rule ( my opinion) to remember - DUT is dominant, TB is secondary. Customers pay for DUT not for TB.
So try always use DUT items in your TB