itkTestDriver: 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/itkTestDriver - from package: libinsighttoolkit4-dev

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

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