Watir testing

Hi All,
I have been working on web application test automation using WATIR. As
per the requirement of the project I wish to have one method to be
executed before the beginning of all test cases and another one at the
end of all the test cases.
Say I have 5 test cases then a setup method should executed before the
first test case method is executed and a destroy method should be
executed at the end of the fifth test case.

Please help

Thanks & Regards,
Manav G.