Software testing is a multidisciplinary enterprise. Its form and function is driven by the needs and perspectives of developers, testers, designers, managers, and other stakeholders. So how do you build a single tool that will satisfy them all? You don't; you build a toolchain.

Gallio is an open, extensible and neutral test automation for .Net. It provides the foundation for a rich suite of interoperable tools such as test frameworks, test runners, test case managers, test generators, test analyzers, IDE integration, build system tasks, reports, and more.

During this presentation, I will describe the architecture of Gallio and demonstrate a few ways that it can be extended to build new test tools. I will also discuss how MbUnit integrates with Gallio and how other test frameworks can do the same.