ctest3: 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/ctest3 - from package: cmake3

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

Error in other languages:
ctest3: bevel nie gevind nie
ctest3: comandă negăsită
ctest3: comando não encontrado
ctest3: commande introuvable
ctest3: command not found
ctest3: käsku ei ole
ctest3: không tìm thấy lệnh
ctest3: komanda nerasta
ctest3: Kommando nicht gefunden.
ctest3: kommandot finns inte
ctest3: komut yok
ctest3: nie znaleziono polecenia
ctest3: níor aimsíodh an t-ordú
ctest3: no se encontró la orden
ctest3: no s'ha trobat l'ordre
ctest3: opdracht niet gevonden
ctest3: parancs nem található
ctest3: perintah tidak ditemukan
ctest3: príkaz nenájdený
ctest3: příkaz nenalezen
ctest3: команда не найдена
ctest3: командата не е открита
ctest3: 命令找不到
ctest3: コマンドが見つかりません