1. Crankshaft testing method for the classification testing of at least one bearing surface of a crankshaft or the like, wherein: a) a reflection of a reference object at the bearing surface to be tested (reflection image) is detected by at least one sensor, using a sensor system, b) the detected reflection image is evaluated with regard to its contrast, and c) the crankshaft is classified as “unsatisfactory” when the contrast is below one of a predefined and a predefinable threshold value.