osstest: 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/bin/osstest - from package: oss4-base

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

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