Rubuta ci gaba don wannan sakin layi - A ranar 28 ga Nuwamba, 2014, Williams ta sanar da cewa Wolff zai kasance tare da ƙungiyar don kakar 2015 a cikin ingantacciyar rawar a matsayin direban gwaji, tare da fadada matsayinta don haɗawa da gudu biyu na Juma'a da kuma gwajin gwaji biyu. Bayan tuki a cikin gwajin pre-season na Formula One, Wolff ya yi zagaye na 1: 29.708 a cikin zaman horo na farko na Grand Prix na Spain
kuma ya dawo cikin matukin jirgi a cikin horo don Grand Prix na Burtaniya, yana aikawa da 1: 37.242 don matsayi na 13 mai daraja daga cikin motoci 20.