How to know if ads displayed are from AdMob or InMobi?

[Faksprod]

Hello,
I hope someone is still maintaining this plugin which could be really helpful.
I'm already using the cordova-plugin-admob-free and I can display interstitial ads in my Cordova app in locally test mode.

Now I'de like to display interstitial ads from InMobi. I have already created an account on the InMobi service and already sync my InMobi banner ID to my AdMob account via Mediation process.

I have installed your plugin. Ads displayed in my app (in test mode) are still the same than before adding your plugin. It looks like AdMob ads. How can I be sure that your plugin is working? Is there any options for selecting the ads source to test?

Thanks for helping, any advises will be hugely appreciate, I'm new in the in-app ads world.