This webinar from Hitex explains unit testing (What is a unit of a C program? What is the interface of a unit?) and the unit testing is demonstrated using the unit testing tool TESSY.
Participants learn how unit testing is performed; how a test case looks like and how easy it is to generate a test report. Furthermore code coverage measurement is demonstrated and how easy it is to find out which branch was not executed given 100% branch coverage was not reached.