These switches typically have a test button but do not have a reset button, as they can be reset by simply toggling the switch off and back on, like a standard circuit breaker switch. Test buttons ...

No need to test, because the button doesn’t test anything. Advertisement c) They’re a safety feature, but, as Leonard Cohen surmised, the threat is fire, not water.

Thus, we have the test and reset buttons, which are meant to simulate a power-cutting situation. To test a GFCI outlet, simply plug some manner of device into the outlet and press the test button.