FlexCover : A code coverage tool for Flex, AIR and AS3

Flexcover is a code coverage tool for Flex, AIR and AS3. It incorporates a modified version of the AS3 compiler which inserts extra function calls in the code within the SWF or SWC output file. At runtime, these function calls send information on the application's code coverage to a separate tool; The modified compiler also emits a separate "coverage metadata" file that describes all the possible packages, classes, functions, code blocks and lines in the code, as well as the names of the associated source code files.



Check it out...
http://code.google.com/p/flexcover/