The user testing tool is a format to guide and capture the testing of your prototype with real users through observation and by collecting user feedback.
It helps to adjust your solution before investing a lot of time and money in the full development of your idea. It will help you to validate your assumptions. You will find out how user-friendly your solution is and how satisfied users are with the experience you offer.
Learn more and download the tool: https://toolbox.butterflyworks.org/tools/user-testing