The test apparatus is for testing an agricultural mower having a line (39) of rotating elements each of which is carrying at least one cutting blade (43) rotatably attached to the rotating element (41), and the apparatus comprises a solid body (29) and means (3, 5, 11, 25, 27, 23, 15) for moving the solid body (29) and the line (39) of rotating elements into mutual engagement and maintaining the engagement for a time with a limited force.
