Gotta question re: unit tests. In C or C++, I'd do something like this in a foo.c/foo.cpp file:

#define FOO_UNIT_TEST
(various functions or objects... )
#ifdef FOO_UNIT_TEST
int main (int argc, char ** argv) {
(code that tests the above )
#endif

--then I'd just compile the one file when testing, or comment out the first line when integrating.

Is there a similar mechanism for Perl?