Do you control your code? Pex puts you back into the driver’s seat.

Right from the code editor, Pex finds interesting input-output values of your methods, which you can save as a small test suite with high code coverage. Pex performs a systematic analysis, hunting for boundary conditions, exceptions and assertion failures, which you can debug right away.

Pex enables Parameterized Unit Testing, an extension of Unit Testing that reduces test maintenance costs.

If you are new to Pex, watch the Pex Channel9 video, read the Code Digger Tutorial, download Pex, and read more documentation.
Watch our PDC 2008 talk on Channel9: Research: Contract Checking and Automated Test Generation with Pex

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Pex is now a DevLabs project. Read Soma's blog "Inspiring through Innovation - DevLabs".

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