Tutorials

Code Digging with Pex - Code Understanding and Automatic Testing At Your Fingertips - Tutorial (PDF) A step-by-step tutorial on applying Pex to any piece of code within Visual Studio.
Moles - Tutorial (PDF) A step by step tutorial on using Moles (for Test Stubs and Detours) and Pex (Automated Test Case Generation).
Unit Testing SharePoint Services with Pex - Tutorial (PDF) A step by step tutorial on writing isolated parameterized unit tests for SharePoint services using Pex.
Parameterized Unit Testing with Pex - Tutorial (PDF)
An 70+ pages tutorial that goes through the basics of unit testing, their extension to parameterized unit tests and more advanced topics on Pex.

Reference Manuals

Parameterized Test Patterns For Effective Testing with Pex - draft (PDF)
Coding patterns for authoring effective parameterized unit tests.
Online Reference Manual for Pex (also available as a single page)
Reference manual containing numerous details about the Pex infrastructure and APIs.
Moles Reference Manual (PDF)
Extension Writer Handbook (PDF)
Guidance to create code that works well with Pex. This document is targetted for unit test framework and mock framework authors, or users willing to write extensions for Pex.

Do you want to present Pex to your team? Use our slidedecks to get started!

Pex Tutorial (tutorial on parameterized unit testing with Pex)
Samples used in Pex Tutorial
Pex Overview (an introduction with technical background)
Stubs and Moles (stubs and moles inside out)

Most of the documentation listed on this page is also bundled in the Pex installer.