Williams has become the latest driver to confirm its drivers for the upcoming F1 test at Mugello. The team will field reserve driver Valtteri Bottas on the opening day of running at the wheel of the FW34 before race drivers Bruno Senna and Pastor Maldonado take over for a day apiece. Bottas, who has already taken part in Friday practice at three races so far this season, becomes the latest non-race driver confirmed for the test.