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    copied!<p>According to the <a href="http://www.typemock.com/Docs/writing_unit_tests_with_isolator.php" rel="nofollow noreferrer">website</a> it uses AOP to redirect calls:</p> <blockquote> <p>Typemock Isolator uses aspect-oriented technology to redirect calls from the real code. This enables developers to define the behavior of the external component required for a tested scenario. For example, you can simulate that the disk is full when writing to a database by instructing Typemock Isolator to throw an OutOfDiskSpaceException when writing to the database. This is a scenario that will be nearly impossible to test without Typemock Isolator. The developer defines the behavior in the actual unit test and Typemock Isolator automatically isolates all required components.</p> </blockquote> <p>This technique requires you to set up a special environment before you can run the test or use a VS plugin.</p> <p>Some people think that the ability to mock everything makes Typemock <strong>too powerful</strong>, since you don't have to think so much about good design. A quote from <a href="http://ayende.com/Blog/archive/2007/08/18/Dependency-Injection-More-than-a-testing-seam.aspx" rel="nofollow noreferrer">Ayende</a>:</p> <blockquote> <p>The main weakness of Type Mock is its power, it allow me to take shortcuts that I don't want to take, I want to get a system with low coupling and high cohesion. </p> </blockquote> <p>But of course since he is the creater of Rhino Mock he is not objective :)</p> <p>I would think you are in for a great deal of work if you want to create a mocking framework with this functionality, so I would recommend to either purchase Typemock, or learn to code without it :)</p>
 

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