@Mammmood - You’re right that there are many ways to accomplish a tensile test. There are also different tools for the job as well.
I’ve done a tensile test on the cam belt on my old Chevy. I bought a special piece of equipment that helps me to perform the test.
It’s a real life saver to know in advance how strong your cam belt is, rather than waiting for it to break when you’re on the road and have to call for a tow truck.