Status 2019: Test drive without TÜV at dealers now history?

Servus miternand! Since I have found no current and crystal-clear answers on the above topic, I have to become active myself: Is it really not possible since 2015 to arrange a test drive with a dealer (in my case the one with the star on the roof) even with a 06 red license plate, if the intended used car currently has no HU+ AU anymore? The reason seems logical, but unfortunately has an enormously counterproductive flip side: No test drive! I don’t like to rely on the seller’s assurance that the bearings, transmission, engine etc. are in perfect condition! Quotation: “Since all service intervals have been adhered to and you don’t have to worry about anything within the 1 year used car warranty, you have nothing to lose. After all, we have a reputation to lose!” So a new methodology crystallizes out here? You let the vehicle run the TÜV, share the potential with: TÜV will be re-made at purchase and cover as long as possible that the test drive date was only a decoy move… Have you had similar experiences and how was it dealt with? Merci