ts_test: 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/ts_test - from package: tslib

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

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