The Bears, preparing for their new Evo-Stik Premier League campaign, held their own for the first hour before the Whites' superior fitness told in the latter stages.
Only Poleon's goal separated the sides at the interval as the Bears gave the Elland Road club a run for their money in the first half.
But Somma and Robinson netted on the resumption and two unfortunate own goals added to the tally to give the visitors a convincing victory.