The answer to 'how to test electrical repair' is to first turn off the power to the circuit or appliance you need to test, then use a multimeter to check for voltage, current, and resistance. This will help you identify any issues with the wiring, components, or connections. Be sure to follow all safety precautions, such as wearing insulated gloves and working in a well-lit area.
Regularly testing electrical repairs is important to ensure your home's electrical system is functioning properly and safely. It's recommended to test any repairs you make, as well as perform routine checks on your home's electrical system at least once a year.