testify-2: 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/testify-2 - from package: python2-testify

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

Error in other languages:
testify-2: bevel nie gevind nie
testify-2: comandă negăsită
testify-2: comando não encontrado
testify-2: commande introuvable
testify-2: command not found
testify-2: käsku ei ole
testify-2: không tìm thấy lệnh
testify-2: komanda nerasta
testify-2: Kommando nicht gefunden.
testify-2: kommandot finns inte
testify-2: komut yok
testify-2: nie znaleziono polecenia
testify-2: níor aimsíodh an t-ordú
testify-2: no se encontró la orden
testify-2: no s'ha trobat l'ordre
testify-2: opdracht niet gevonden
testify-2: parancs nem található
testify-2: perintah tidak ditemukan
testify-2: príkaz nenájdený
testify-2: příkaz nenalezen
testify-2: команда не найдена
testify-2: командата не е открита
testify-2: 命令找不到
testify-2: コマンドが見つかりません