Actually it’s very clear…
Section 10 p7 & appendix 10 p9110) TRACK RUNNING TIME OUTSIDE AN EVENT, WIND TUNNEL TESTING AND POWER UNIT BENCH TESTING
10.1 Testing of Current Cars (TCC) shall be defined as any track running time, not part of an Event, in which a Competitor entered in the Championship participates (or in which a third party participates on behalf of a Competitor or a supplier of a homologated power unit), using cars which were designed and built in order to comply with the Technical Regulations of the Championship, or those of the preceding year’s or the following year’s Championships. No Competitor may sell or make available any such car of the current year to any third party without the prior authorisation of the FIA.
Read it for yourself…
https://www.fia.com/sites/default/files ... -07-12.pdf