A method for testing consistent test objects for the presence of holes or cracks in a bottom surface, wherein each test object is delimited by the bottom surface, an opening situated opposite the bottom surface and a lateral surface extending between the opening and the bottom surface, comprising the steps: - providing an electrode arrangement comprising an upper electrode arranged in a fixed position above a transport plane and a lower electrode arranged in a fixed position beneath the transport plane, as well as a discharge path between the upper and the lower electrode, - connecting a first controlled voltage source to one of the two electrodes and connecting a second voltage source to the other of the two electrodes, wherein the two voltage sources (5, 6) are connected electrically in series, - transporting each of the test objects along a transport path lying in the transport plane, which runs between the upper electrode and the lower electrode, - controlling the first and second voltage source (5, 6) in such a manner that a voltage of the first voltage source is generated only when one of the test objects is located between the upper and the lower electrode (3a, 3b), and a voltage of the second voltage source is generated continuously during the testing of the test objects, wherein the sum of the voltages generated by the two voltage sources (5, 6) is applied as a test voltage to the electrodes (3a, 3b), - controlling the magnitude of the test voltage in such a manner that it is greater than or equal to the breakdown voltage between the electrodes (3a, 3b) in air and smaller than the breakdown voltage between the electrodes (3a, 3b) through a flawless test object without holes or cracks, and - determining whether holes or cracks are present in the test object by detecting a breakdown between the electrodes (3a, 3b). - providing an electrode arrangement comprising an upper electrode arranged in a fixed position above a transport plane and a lower electrode arranged in a fixed position beneath the transport plane, as well as a discharge path between the upper and the lower electrode, - connecting a first controlled voltage source to one of the two electrodes and connecting a second voltage source to the other of the two electrodes, wherein the two voltage sources (5, 6) are connected electrically in series, - transporting each of the test objects along a transport path lying in the transport plane, which runs between the upper electrode and the lower electrode, - controlling the first and second voltage source (5, 6) in such a manner that a voltage of the first voltage source is generated only when one of the test objects is located between the upper and the lower electrode (3a, 3b), and a voltage of the second voltage source is generated continuously during the testing of the test objects, wherein the sum of the voltages generated by the two voltage sources (5, 6) is applied as a test voltage to the electrodes (3a, 3b), - controlling the magnitude of the test voltage in such a manner that it is greater than or equal to the breakdown voltage between the electrodes (3a, 3b) in air and smaller than the breakdown voltage between the electrodes (3a, 3b) through a flawless test object without holes or cracks, and - determining whether holes or cracks are present in the test object by detecting a breakdown between the electrodes (3a, 3b).