BROOKLYN — The North Carolina basketball team knew what lay ahead of it at the beginning of the week. An ACC Championship title was at stake. Against top-seeded Virginia, the Tar Heels needed every bit of offensive and defensive power it could muster. But carried by the momentum after wins against No. 24 Miami and No. 5 Duke, UNC managed to make some shots against the Cavaliers. Even so, Virginia offered a litmus test for the Tar Heels to see how it compares to other national title contenders. And Saturday proved that UNC has work left to do.