There is no standard test for protection from a rotation injury. MIPS is a proprietary technology that is only justified by a test procedure defined by the MIPS developers.
While there is no standard, there are other institutes that have done comparison testing on helmets that have come up with conclusions similar to MIPS.
Here’s the first one that will come up while searching the Google. Testing completed by Virginia Tech and the Institute of Highway Safety.
https://www.iihs.org/iihs/news/desk...-some-bike-helmets-protect-better-than-others