How to open testing widow in unreal engine 4?

Do i test my game in unreal engine 4 with a seperate test window?

Hi, I don’t understand your question. Do you want to run tests you made with Automation Testing inside the editor?
If so, go to Window->Developer Tools->Session Frontend.
Inside Session Frontend, go to automation and run the tests you like.

When you want to test your game, there are various options:

Standalone:

Packaged:

I feel OP is actually asking about the New Editor Window (PIE); which, coincidentally, is in the first screenshot.

What is that? ( hey, it’s monday… )

Ok, same window you get if you run in blueprint…

Yes, unless you run it from the main editor window where it will launch directly in that viewport.