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"Typemock Isolator enables us to modify our legacy applications without changing the source code."
Christian Mérat, .NET Architect & Developer, GSoft Group
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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.