Added tests in EquaSetSpec to ensure FastEquaSet intersect method return type is FastEquaSet.
Added tests in EquaSetSpec to ensure FastEquaSet intersect method return type is FastEquaSet.

janekdb/scalatest,rfries/scalatest,rfries/scalatest,janekdb/scalatest,rahulkavale/scalatest,matterche/scalatest,janekdb/scalatest,rfries/scalatest,gcberger/scalatest,flicken/scalatest,triggerNZ/scalatest,rahulkavale/scalatest,SRGOM/scalatest,triggerNZ/scalatest,gcberger/scalatest,rfries/scalatest,SRGOM/scalatest,rahulkavale/scalatest,triggerNZ/scalatest,flicken/scalatest,matterche/scalatest,SRGOM/scalatest,gcberger/scalatest,SRGOM/scalatest,gcberger/scalatest,janekdb/scalatest,triggerNZ/scalatest,flicken/scalatest,rahulkavale/scalatest,matterche/scalatest,matterche/scalatest,flicken/scalatest