JEREZ. Spain - Ferrari finished Formula 1's first pre-season test on a high note as Fernando Alonso was fastest in Friday's session.The Spanish double World champion had a quickest lap of 1min18.877 to go seven-tenths faster than the field.The Italians rebounded from a subdued start with the second-fastest time this week among 2012 designs though Alonso's running was restricted to 39 laps due to a hydraulics problem.ENGINE SWOPJean-Eric Vergne of Toro Rosso was second on Friday ahead of Red Bull’s defending World champion Sebastian Vettel whose best lap was 1min19.606 after losing the morning session to an engine-related electrical issue that forced his engine to be swopped.Double defending champion Vettel said: "Something like this is simply part of testing, this is the reason we are here. Of course we would like to get more laps done but that can't be changed now. So we go back to the factory."Lewis Hamilton was fourth for McLaren in front of Lotus' Romain Grosjean, whose quickest lap on Thursday has so far set the pace for the 2012 cars.REST OF TOP 10"Everything is feeling good," Grosjean said. "We’re pushing to get as much achieved as possible. I'm really enjoying being in the car, even though it is hard work."Kamui Kobayahsi of Sauber was the only other driver within a second of Alonso, with the rest of the Top 10 rounded off by Nico Hulkenberg of Force India, Bruno Senna of Williams and Jarno Trulli of Caterham, who was more than three seconds off the pace.