local myuuid
  if grep -q "${device}" "${ssdmap}"; then
    #create symlink based on saved uuid
    myuuid=$(grep "${device}" "${ssdmap}" | cut -d ' ' -f 2)
  else
    # generate new uuid and add it to the map
    if ! myuuid=$(uuidgen); then
      echo "Failed to generate valid UUID with uuidgen" >&2
      exit 2
    fi
    echo "${device} ${myuuid}" >> "${ssdmap}"
  fi

func verifyGraphInvariants(scenario string, uidToNode map[types.UID]*node, t *testing.T) {
	for myUID, node := range uidToNode {
		for dependentNode := range node.dependents {
			found := false
			for _, owner := range dependentNode.owners {
				if owner.UID == myUID {
					found = true
					break
				}
			}
			if !found {