TestApi - a library of Test APIs

http://testapi.codeplex.com/

TestApi is...

TestApi is a library of test and utility APIs that enables developers and testers to create testing tools and automated tests for .NET and Win32 applications. TestApi provides a set of common test building blocks -- types, data-structures and algorithms -- in a simple, layered, componentized and documented stack.

Get started

• Get the latest release.
• Read the following blog articles for a quick introduction to some of the available features:
  • Overview of TestApi
  • Part 1: Input Injection APIs
  • Part 2: Command-Line Parsing APIs
  • Part 3: Visual Verification APIs
  • Part 4: Combinatorial Variation Generation APIs
  • Part 5: Managed Code Fault Injection APIs
  • Part 6: Text String Generation APIs
  • Part 7: Memory Leak Detection APIs
  • Part 8: Object Comparison APIs
  • Part 9: Application Control APIs
• Read the documentation, experiment with the samples, check out the source code.
• Let us know what features you would like to see in future releases.

The ZIP file contains the DLLs, as well as the samples, source code and documentation. 
You can download the ZIP file, and just use the DLLs.