Test of strength JR9 rims

Greetings together, I wanted to ask a question : And indeed I bought myself for my Mazda Japan Racing JR9 rims ( ET40 8j18 ) There would be my question , because the rims do not have an official ABE , whether one of you possibly did a dkhonmal a strength test . Is at least a well-known manufacturer . For help I would be super grateful !!