[plt-scheme] testing a module

what is the most sensible way to include tests in a module?

python uses an idiom where

if __name__ == '__main__':
    do_the_tests()


is placed at the end of a module, and then the module can be called with

 > python <module-name>

and do_the_tests() will be executed.

What's the most sensible way to do this in drscheme? I would expect the 
test code to be executed when I "ran" the module in the IDE.

cheers and thanks

Chris Wright