It seems like you're looking for information related to changing a surface unit test for a specific requirement or scenario, possibly in a software development or engineering context.
However, "changing surface unit test 8a" isn't specific enough for me to provide a precise answer. Could you provide more context or details? For example:
- What type of surface are you referring to (e.g., physical surface in engineering, a graphical user interface in software development)?
- What framework or programming language are you using?
- What specific changes are you looking to make?
With more information, I'd be happy to assist you further!