int numRegions = admin.getTableRegions(TABLE_NAME).size();
int numRegionsAfterMerge = numRegions - 2;
admin.mergeRegions(regions.get(1).getEncodedNameAsBytes(),
regions.get(2).getEncodedNameAsBytes(), true);
admin.mergeRegions(regions.get(5).getEncodedNameAsBytes(),
regions.get(6).getEncodedNameAsBytes(), true);
waitRegionsAfterMerge(numRegionsAfterMerge);
assertEquals(numRegionsAfterMerge, admin.getTableRegions(TABLE_NAME).size());