I found a cool tool today for doing mutation testing in C#. Basically, it runs your unit tests to analyze your code coverage, then it purposefully modifies the sections of your code that are covered, to see if the tests will still pass. The theory is, if the tests pass, then even though you have coverage, you're not asserting the right things. So, it helps you analyze the quality of your unit tests.
Check it out here: http://galera.ii.pw.edu.pl/~adr/CREAM/index.php
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