How can I test a rodent's memory?

im studying on some kind of herb as memory enhancer, but how do i know if the rodent's memory enhanced?How can I test a rodent's memory?
the most frequently studied forms of memory in a rodent are recognition memory and spatial memory. to test these scientists often use a water maze, you can build your own at home, the rats instinct will be to find out how to get back on to land, test how long it takes him (give him to goes), after using the herb on him for a few days try again (exact same lay out) and see if he does it in a shorter time with fewer mistakes. Forgot to say it should be an open maze ie not completely underwater, he needs to breath =) You can use a dry maze with food at the end if its easier for you.How can I test a rodent's memory?
Try a maze