testsuid: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/lib/tiger/bin/testsuid - from package: tiger

You may install the required package with command apt-get install {package}

Error in other languages:
testsuid: bevel nie gevind nie
testsuid: comandă negăsită
testsuid: comando não encontrado
testsuid: commande introuvable
testsuid: command not found
testsuid: käsku ei ole
testsuid: không tìm thấy lệnh
testsuid: komanda nerasta
testsuid: Kommando nicht gefunden.
testsuid: kommandot finns inte
testsuid: komut yok
testsuid: nie znaleziono polecenia
testsuid: níor aimsíodh an t-ordú
testsuid: no se encontró la orden
testsuid: no s'ha trobat l'ordre
testsuid: opdracht niet gevonden
testsuid: parancs nem található
testsuid: perintah tidak ditemukan
testsuid: príkaz nenájdený
testsuid: příkaz nenalezen
testsuid: команда не найдена
testsuid: командата не е открита
testsuid: 命令找不到
testsuid: コマンドが見つかりません