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We need to maintain legacy applications that were not built to facilitate unit testing. Without Typemock we would be completely unable to effectively test these applications. Typemock boosts productivity because you do not have to explicitly code from the ground up with testing in mind, which can be difficult to handle. Typemock has been able to cover up the coupling and dependency sins that we all have leaked into our applications from time to time.  
Edmund D. Gorski, President, CodePoets, Inc.
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FAQ -Unit testing .NET - plain smart test tools > Features > How does Typemock Isolator work?

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Typemock Isolator uses an aspect- oriented programming design that creates a mock aspect. Internally, it usesthe .NET framework profiler API to monitor an application's execution. When a method is called, the CLR notifies Typemock Isolator; the framework can then return mocked values and override the original code completely.