I am considering to buy a Mini 4 Pro with a controller that is water-damaged, so the controller is not working.
Is there a way for me to know that the drone is in OK condition, without having the controller? According to seller, the drone is working perfectly, but I would like to test it before I buy it 
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You’d only be able to do limited testing without a way to fly the drone.
If you know someone who owns a DJI drone, they might be willing to lend you a compatible remote controller. You could temporarily bind it to the drone for testing.
The following remote controllers are compatible with the Mini 4 Pro:
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