testing for leaks

Ok, this might be a little late, but...
After camping in nice weather with the TD, I want to try camping/traveling in the rain(if needed). I have not dared to test the TD for water proofing for the fear that all the hard work would be lost. But I gotta know if it leaks. What have others done to test if their TD is waterproof and if not; was there any water damage?
After camping in nice weather with the TD, I want to try camping/traveling in the rain(if needed). I have not dared to test the TD for water proofing for the fear that all the hard work would be lost. But I gotta know if it leaks. What have others done to test if their TD is waterproof and if not; was there any water damage?
