Why the Spanish GP is the ultimate test for Red Bull (and every team)

In the previews for an upcoming Grand Prix, Red Bull Racing has heard it time and again lately: "Imola will not be our best weekend". And: "Monaco is not like us". Or: "It will be difficult in Canada." But ahead of the Spanish Grand Prix, the noises from the Austrian team are completely different. There is an expectation that Red Bull will once again be that leading team of recent seasons in Barcelona. If that is indeed the case, the rest of the season will be viewed with great confidence. If Red Bull do have problems, that also says a lot about the rest of the year.