 Complete the following phrase:  The 2015 car began private testing at Porsches Weissach test track with Lieb in December 2014. Drivers further tested it at UAEs Yas Marina Circuit, the Bahrain International Circuit and Spains Ciudad del Motor de Aragón from January to March. The first pictures of the car were published online on 16 January, and it was officially revealed to the press at Circuit Paul Ricards official two-day pre-season test session on 26 March. Porsche used three liveries for the 