Add generated exists tests.
Add generated exists tests.

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