Android Question how to test inapp purchase/subscription? [SOLVED]

hi

how can i test inapp purchases or subscriptions?
it seems like if the app is installed locally i am not able to test inapp purchases but if i upload a build to internal testing on my google console account and download from there i can test the purchase. but this is not really convenient. i would like to do it in debug mode.

is there any way to do that?

thanks