private static RegionInfo createMockRegionInfo(int storeFileSizeMb) {
    return createMockRegionInfo(DEFAULT_TABLE, storeFileSizeMb);
  }
Helper method to create a RegionInfo for the default table with the given store file size.
hbase-balancer/src/test/java/org/apache/hadoop/hbase/master/balancer/TestStoreFileTableSkewCostFunction.java