Not seen this before. EASA requirements.
Flight tests on a modified B737 max [one full week - at Boeing Flight Test Center]
MCAS operations (nominal behavior)
Flight without MCAS (including high speed turns and stall)
Scenario of stabiliser runaway (uncommanded MCAS activation, manual trim wheel forces)
Approach to stall with autopilot engaged
https://www.europarl.europa.eu/cmsda...y-original.pdf