Bash, php, own testing tool for websites

I need testing tool for website, for example automatic adding some product in store and make automatic order. This is an example website.

https://coopshop.u-sluno.eu/

test / test2test

Is possible to make some bash or php script to do this? What is the best solution? What about your experiences? Have you any examples of bash or php scripts?

Thank you for contributions.

S.