It seems an updated version of Russia's Klimov TV7-117 turboprop engine, being developed to power a new version of the Ilyushin Il-114 commuter transport plane and the Il-112 light military transport aircraft, is being air-tested in a rather unlikely-looking combination.
Yes, that's a four-engine Ilyushin Il-76 heavy transport plane, many times larger than the smaller aircraft for which the new engine is intended. The Il-76 uses powerful jet engines, not turboprops, but that hasn't stopped Klimov from testing its new engine on its wing.
It looks very strange to eyes that know the Il-76, but it seems to fly just fine.
You can read more about the testing here.