@Test
public void getPrebucket() throws Exception {

  final RenderBucketType preBucket = RenderBucketType.getRenderBucketType("PreBucket");
  assertNotNull(preBucket);
  final RenderBucketType preBucket2 = RenderBucketType.getRenderBucketType("PreBucket");
  assertSame(preBucket, preBucket2);
  assertSame(RenderBucketType.PreBucket, preBucket);
}