Can Whitebox Testing be performed on UE4 projects?

Hi guys, first post on this forum so please welcome me with open arms! I’m somewhat new to development on Unreal Engine 4, i have just finished development on my project and i was wondering if someone could explain the process of carrying out WhiteBox testing on the Blueprint Visual Scripting system? No c++ code has been used during development (Although i know C++ code is the back bone of Unreal Scripting system - correct me if im wrong). Iv looked everywhere but cant seem to find any hints or tips or examples of this being carried out anywhere. Any tips for the Unreal community? PS iv never done WhiteBox testing before, but have a slight understanding of the meaning.