There is provided an apparatus for producing stress on a surface, said apparatus comprising one or more service assembly and one or more cleaning assembly, (a) wherein said service assembly comprises one or more means for applying dirt to said surface, or one or more means for scuffing said surface, one or more means for dragging a test material across said surface, or a combination thereof, and (b) wherein said cleaning assembly comprises one or more scrubber, or one or more burnisher, or a combination thereof. Also provided is a method of testing a surface with such an apparatus.