VNF test related projects such as VVP VNFSDK are not involved, so test requirements can be based on Frankfurt or Frankfurt maintenance release.
[TSC Glossary] Terminology definition for testing https://github.com/cntt-n/CNTT/pull/1649
The Evolution of VNF/CNFI/NFVI Compliance & Verification: OVP 2.0 - Rabi Abdel, Vodafone & Marc Price, Matrixx (https://events.linuxfoundation.org/open-networking-edge-summit-north-america/program/schedule/)