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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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Isolator Features > Magically simple > A fully documented and simple Arrange-Act-Assert API


Both the C# and the VB.NET APIs are fully documented, so you'll always get good tooltips when working with intellisense. Also, since they both support the Arrange-Act-Assert testing pattern, they are simpler and more intuitive to use than traditional record-replay frameworks.