Robert Kubica has completed the first of two days testing a 2014-spec Williams as part of the team's evaluation of his potential for a race seat next year.
Kubica has not raced in F1 since a 2011 rallying crash left him with severe injuries to his right arm. The Pole has returned to contention this year and was given a series of tests by Renault, culminating in a day behind the wheel of this year's car at the post-Hungarian Grand Prix test in Budapest.