The answer to 'how to test outlet' is to use a voltage tester or outlet tester to check if the outlet is properly functioning. These tools can quickly and safely determine if the outlet has power, is properly grounded, and is wired correctly. It's a good idea to test outlets periodically, especially if you notice any issues like flickering lights or appliances not working properly.
Before testing an outlet, make sure to turn off the circuit breaker supplying power to that outlet. This ensures your safety when using the tester. Plug the tester into the outlet and check the readings. If the outlet is working properly, the tester will indicate this. If there are any issues, the tester will alert you so you can address the problem or call in a professional electrician.