Already reported in the car launch thread, but we don't have a 2016 Sauber one yet so this might as well be the news to start from:
New Sauber will not be ready for first F1 test
They say it's according to plan, but having only one test for a new cars is surely a situation far from ideal and quite risky? Might prove to be a difficult start of the season for them (as if they had it easy for the past few years).