The easiest way to test if your doorbell button is receiving power is to simply press the button and listen for a sound. However, if your doorbell isn't working properly or you aren't sure, this is not a good enough test to ensure your safety if you're going to do some work on the doorbell. \
The safest and surest way to check if your doorbell has power is to use a multimeter. This will show you exactly how much voltage the doorbell is receiving, if any. \