void () { GroupNode groupNode = buildUsageTree(new int[]{0, 1, 0, 1 , 1, 1003, 1002, 1001}, new UsageGroupingRule[] {new OddEvenGroupingRule()}); assertEquals("Root [Even[0, 0], Odd[1, 1, 1], 1001, 1002, 1003]", groupNode.toString()); }