Microsoft WPF team has released the TestApi v0.3 with various new additions and updates to the common testing API library.  The new APIs and updates include:

• Managed code fault injection API
• Combinational variation generation API
• New application control API
• Visual verification additions
• Acceptance tests
• New samples
• New namespace and binary naming
• Updated documentation

The release can be downloaded from here as a zip file and don't forget to follow these steps to unblock the downloaded zip file before you unzip it. 

The mastermind behind this initiative, Ivo Manolov, also has a series very good blog posts for more details about the new APIs:

• Part 1: Input Injection APIs
• Part 2: Command-Line Parsing APIs
• Part 3: Visual Verification APIs
• Part 4: Combinatorial Variation Generation APIs

Please send your feedback, comments, thoughts and suggestion to wpftbest@microsoft.com or post them at the TestApi forum.  Thanks!