openscad-testrun: 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/openscad-testrun - from package: openscad-testing

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

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