Google adMob without unit ID(AdMob publisher ID), just for testing

Is there some way to test adMob in my android application, without having to sign up for it? I first want to test it, before paying to get one. Maybe with some 'general' ID, or some other trick?

Is there any AdMob dummy ID?

There aren't dummy ID's per se. You need to setup the XML or the JAVA code to get test ads.

Can I earn from AdMob without uploading at Play Store?

In 2022, you can't monetize your app with admob without publishing it on Google Play Store or any other app store.

Should I use different AdMob ad units ID in different activities?

Actually, according to the Admob for Android Guide , yes you should! An Ad Unit ID is a unique identifier given to the places in your app where ads are displayed. If you have an app with two activities, for example, each displaying a banner, you need two ad units, each with its own ID.

ADmob is free!!! :D. just go and make yourself an account. you cant do it without an id.