The smiling Red Bull driver finished second in Singapore last weekend, with Rosberg winning and triple champion Hamilton third.
The Halo was tried on track by Ferrari's Kimi Raikkonen on Thursday.
It was the first time in 2016 testing that the world champions had led the timesheets at the end of the day.
Mallya, known for his flamboyance, says he still is the boss at Force India.
The season starts in Australia on March 20 but the new qualifying format will require changes to the software controlling the timing system.
Hamilton claimed the change to heavier hybrid cars in recent years is the real problem with the sport rather than the lack of competition.
The German, running on medium compound tyre in his Mercedes-powered VJM09, was 0.728s clear of Renault's Kevin Magnussen.
The season, which features a record 21 races, starts in Australia on March 20 and the first European round is in Spain on May 15.
Ferrari`s Sebastian Vettel took advantage of a new ultrasoft tyre to propel himself to the top of the timesheets for the second consecutive day of pre-season testing in Barcelona.
"It is better than being last but (being fastest) is not really important," said Vettel.
Hamilton is looking for a third consecutive drivers` championship.
Ferrari is looking to challenge Mercedes after finishing second in the 2015 constructors' championship.
Ferrari revealed their red and white SF16-H car in an online presentation.
Force India’s car launch will take place at 8:30am Spanish local time on Monday.
Schumacher suffered traumatic injuries after hitting his head against a rock while skiing in Meribel, France in December 2013.
The seven-time Formula One world champion suffered traumatic injuries after hitting his head against a rock while skiing in Meribel, France in December 2013.
I listen to my coaches and my team-mates, the people around me, and I don`t really listen to what a lot of people out there are saying because a lot of it is rubbish.