unit test code coverage using gcov

You can get a detailed and useful report on code coverage of your unit tests using the tool gcov.
It is very simple to setup and use.

useful links:
http://www.redhat.com/docs/manuals/enterprise/RHEL-4-Manual/gcc/gcov.html
http://gcc.gnu.org/onlinedocs/gcc-3.1.1/gcc/Gcov.html