[plt-scheme] module access from test cases file

Hi,

I would like to keep my test cases in a file separate from the main
application, but this seems to mean I have to export all tested
functions from the module (with provide), which I don't need/want to
otherwise.

Is there a possibility to export functions to one other file only, or
even have two files share the same module (I must admit I'm thinking of
something like package access in Java which is handy for the test classes)?

Thanks a lot for your help,
Sigrid