mm-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/mm-test - from package: plainbox-provider-checkbox

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

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