volume_test: 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/plainbox-providers-1/checkbox/bin/volume_test - from package: plainbox-provider-checkbox

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

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