AdMob + Unity + Emulator = No Ad? (Is it supposed to be like this?)

As the topics states;

If i implement AdMob into my Unity application, compile it to .apk, install it on the emulator, is the emulator supposed to show the Ad? Because in my case it doesn't and i've tried everything.

Please note: I've tested the exactly same code and compiled it using only java and that works splendid. But when i go into Unity, all I get is the standard blue screen. Have I missed something?

While compiled in Unity I still get AdRequests and such things, it just won't show the Ad!

TDLR; I get NO AD, when using Unity + Emulator, is it supposed to be like this?