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Drain plug in. To test your bilge pump reach into the bilge and lift the float switch if you can. Do this with the battery switch turned on and turned off.

If your bilge pump float switch is not manually operable use a hose to raise the water level in the bilge until the pump begins to run. Again, do this with the battery switch set to off and to on.

It would probably be a good idea to perform the flooding test regardless as it's useful to know if and how well your bilge pump operates.

If shore power is available at your slip consider installing an automatic battery charger to prevent your bilge becoming flooded if your batteries run out of usable power. Dead batteries are a primary cause of flooded or sunken boats in slips.