testr: 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 CentOS possible default full paths are:

/usr/bin/testr - from package: python-testrepository

You may install the required package with command yum install {package}

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