No one is lifting water thirty feet, in any practical application of a standard centrifugal pump. Even twenty-five is a stretch. In order to evaluate both pump and well, you must remove any restrictions from the outlet of the pump, and install a nipple and a tee, with a pressure gauge, and a gate valve, and an elbow and some more pipe for a horizontal discharge. You also can use a vacuum gauge to view conditions on the suction side of the pump. Operating the pump with the discharge partially closed will give you varying outlet pressures, and you can measure the flow, usually by the bucket method. (I might use a 30 gallon trashcan on a pump this size) You should always pump the well for at least an hour, with an eye on the gauges, to see how the water table is holding up.