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"Typemock has helped us get some difficult to test code under test, as well as speed up the writing of some business rules/classes. The new version is quite impressive with the suggested tests. Any tool that helps you write more (and better!) tests has got to help make better quality code." 
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Isolator Features > Magically simple > Fake behavior on live objects


Isolator enables you to magically change the behavior of existing (live) classes and objects without needing to create a fake instance of them first. This makes the test more readable and more intuitive to use.


When you fake the behavior of a live object, all other methods of the object are run as normal, and only the method you care about has fake behavior. This will also work with instances of singleton classes!