Testing is typically referred to as Quality Assurance, so that's what you need to look for. It's a fairly niche role you're looking for, so there's not a lot around. A bit of googling turned this up :
An exciting opportunity has come up for a VR Content Analyst to join the in-house QA team working on ground breaking VR and Mixed Reality enterprise projects.
www.luminousgroup.co.uk
I have no connection to the company at all. The job description might give you an idea of what you'd need skills wise.
FWIW testing is an under-paid, under-appreciated, surprisingly skilled profession. It's not just playing around in VR or whatever all day, it's very process-oriented and suits very well organised people.