Unfortunately the way has currently programmed the B-Hyve, it will only show you the rain sensor delay when an automatic program is scheduled to run. It will give you no indication at all prior or after. Not sure why they do this and I’m hoping they change the functionality in an upcoming firmware update. They do a good job of indicating that the is a delay based on weather, but I would love an indicator to always show when the rain sensor is invoked.
So the best way to test is to create a program and schedule it to run in a minute or two from when you want to test. You should then see the appropriate message if the rain sensor has kicked in.