Just rinse it off. If dropping it didn't break it then there is no problem.
Ok thank matt
Like mattgirl said it should be ok but all the test kits I’ve ever gotten had a weird cap issue where when I shook them liquid would leak out so as long as that has never happened to you it should be ok.
You may want to keep the tubes farther away from the tank when you are testing from now on too. That would have been a big clean-up job had it been open still.