[plt-scheme] Issues while unit-testing macro expansion

I was wondering why is it that when running tests.ss in DrScheme, all
the tests pass, but not in mzscheme. For DrScheme, when I hit C-t,
run-tests says that all the tests passed. For mzscheme, when I perform
(require "tests.ss") it raises an error.

What is the behavior of current-load-relative-directory wrt this
matter? How does it differ between DrScheme and MzScheme?

-- 
Rommel M. Martinez
http://www.bespin.org/~ebzzry
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