Testing a Standalone packaged build without access to code base

What tools, scripts, or methods would anyone recommend for being able to test a standalone build of an Unreal project without having access to the project’s codebase?

So, no plugin or API could be added to the original project codebase.

Are there testing software tools available to be able to test an Unreal build with these restrictions?

Bueller?

Does anyone ever reply on these forums?