Added test case for TopK
Added test case for TopK

mbarkhau/counts,seiflotfy/skizze,skizzehq/skizze,martinpinto/skizze,njpatel/skizze,njpatel/skizze,martinpinto/counts,seiflotfy/counts,seiflotfy/counts,skizzehq/skizze,mbarkhau/counts