Development mule

Porsche 918 Spyder development mule in Monaco (2013)
A camouflaged pre-production BMW X5 mule near Munich, Germany (2013)
Honda Civic mules at Death Valley's Badwater Basin in the United States (2015)
Hyundai Grandeur mule in South Korea (2022)
iCar V27 mule in China (2025)

A development mule, also known as test mule or simply mule, in the automotive industry is a testbed vehicle equipped with prototype components requiring evaluation. They are often camouflaged to cover their designs.