ExtractGroup1.AllGroups=["GRP_grp0","GRP_grp1"]
ExtractGroup1.UpdatePipelineInformation()
res=servermanager.Fetch(ExtractGroup1,0)
-assert(res.GetBlock(0).GetNumberOfCells()==3)
+assert(res.GetNumberOfBlocks()==2)
+assert(res.GetBlock(1).GetNumberOfCells()==1)
+assert(res.GetBlock(0).GetNumberOfCells()==2)