Depender is a tool that I created to illustrate several concepts both for my book and both for my training classes. I think it should prove valuable (as it gets more and more features) to anyone who is trying to write tests for existing code. Depender
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Read the complete post at http://weblogs.asp.net/rosherove/archive/2008/07/05/introducing-depender-testability-problem-finder.aspx