The present invention relates to a testing method and a corresponding testing system, for example for testing workpieces (2), which are provided for producing containers, in particular beverage bottles, and which can consist of a basic body and a barrier layer that is at least partially applied to the basic body, whereby the workpieces (2) are transported into a receiving vessel (4) by means of a transport device (3), and whereby an image of the workpieces (2) is generated by means of a capturing device (6) and is transmitted to a processing device for testing, wherein the workpieces (2) are led into the receiving vessel (4) upon leaving the transport device (3), whereby the image is generated between the departure from the transport device (3) and the receiving vessel (4) and wherein the image is processed by the processing device in such a way that the quality of the basic body and/or the quality of the barrier layer of the workpieces (2) is tested in order to detect defective workpieces (2). The same testing system and the same testing method can also be used to count the workpieces (2).