NCover

NCover is a free code coverage tool for .Net, we use to ensure that our automated unit tests are traversing all code paths in our application.

NCover provides statistics about your code, telling you how many times each line of code was executed during a particular run of the application. The most common use of code coverage analysis is to provide a measurement of how thoroughly your unit tests exercise your code. After running your unit tests under NCover, you can easily pinpoint sections of code that are poorly covered and write unit tests for those portions.

Code coverage measurement is a vital part of a healthy build environment.