Britain's Paul di Resta is set to become a grand prix regular as Force India's reserve driver while compatriot Gary Paffett will be McLaren's main tester, according to team principal Martin Whitmarsh.
The Finn will race for McLaren next year in a straight swap with Spaniard Fernando Alonso, who has taken his place at Renault.
The 23-year-old British driver has tested for McLaren and currently drives for Mercedes in the German DTM touring car championship.