As Jesper mentioned, not always a good idea to test on a production system.
Also keep in mind that Server 2012 supports ADFS 2.1.
ADFS 2.0/2.1 is outdated, a suggestion might be to go to 3.0 or higher. I belive salesfoce supports this and you can reach out to them to verify.
Most important, you will also need ADFS certificates.
Isaac Oben MCITP:EA, MCSE,MCC <a href="https://www.mcpvirtualbusinesscard.com/VBCServer/4a046848-4b33-4a28-b254-e5b01e29693e/interactivecard"> View my MCP Certifications</a>