Take red and black wires from the transformer output and touch the contact pads on the motor. The order does not matter at this step, but normally you should have the red wire on the central pad and the black wire on the long bottom pad. See the picture below. Now make some noise.
Any sort of sound in your headphones would mean that the test is passed. The quality of the sound does not matter, as the motor cannot sound properly when laying flat on a surface. Moreover, you may hear the noises and interference sounds – it is normal, as you have the wires in your fingers and the whole system is not screened with a metal body.