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With Typemock we don’t have to rewrite product code specifically for testing purposes. This not only saves time, it also allows us to test components of our product code that cannot be readily changed, enabling comprehensive testing and overall high quality.
Travis Illig, Senior Software Engineer, Digital Channels, Fiserv
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Isolator Features > Powerful IDE and Debugging Intergration > side-effect-free debugging of mocks and stubs


With other frameworks, if, during debugging, you open the watch window, and evaluate (even by mistake) the value of a fake property of a method, the isolation framework will treat this action as if it was run from production code, and so you might fail the test or cause unknown behavior from the faked methods or properties.

Isolator is smart enough to detect such actions and will do two things:

  • Return the fake value that was assigned to that method or property to see in the debugger
  • Ignore this action as if it never happened so the test can continue as is even during debugging