Gutierrez was fourth fastest on the final day of running in Jerez, completing 142 laps.
"It was a very positive day, because we managed to do a lot of laps," he said.
"We did some new tyre runs at mid-day, and then we did some long runs with high fuel in the afternoon, which gave me the chance to try the car in all different circumstances."
"It was very interesting for me, because I was able to feel very different things, and I learnt how to adapt my driving style to different situations. It was great to do this at a test, because now I have time to analyse it all and then go to Barcelona on a stronger basis. I’m really happy how things went."
Head of track engineering Tom McCullough believes it has been an encouraging test for Sauber.
"As a team we can be very happy with the four day test. We had a lot of test items to work on which, with excellent car reliability, we were able to get through. Both drivers are giving very good feedback, and are integrating very well with their engineers. For us as a team it was a very encouraging first test," he said.