quantlib-test-suite: 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/quantlib-test-suite - from package: QuantLib-test

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

On Debian possible default full paths are:

/usr/bin/quantlib-test-suite - from package: libquantlib0-dev

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

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