How can you tell if your water pump bad?

besides making a sqeeling noise , or leaking from the weep hole , you can wait until the thermostat is open ( top radiator hose will be HOT ) and squeeze the top radiator hose , when you stop squeezing the hose if there is no surge of coolant flowing through the hose then your water pump is not actually circulating your coolant and has a bad impeller inside the water pump