A method for detecting a position anomaly of a test object on a workpiece, the method including capturing an image of the test object to obtain image data; determining a real position of the test object in relation to the testing robot based on the image data; moving a testing sensor carried by the testing robot into contact with the test object based on the real position; acquiring test data of the test object by means of the testing sensor when the testing sensor is in contact with the test object; and detecting a position anomaly of the test object based on a comparison between a test object position and a reference position, the test object position being based on the real position, based on the test data and/or based on a position of the testing robot when the testing sensor is in contact with the test object.