The o:XML Unit Test vocabulary enables test-driven development to be an integral part of the development process. Tests can be written as stand-alone suites, or even inlined with type definitions. Similarly to the documentation vocabulary (see the document project), Unit Tests represent an orthogonal extension to o:XML, powerfully illustrating the flexibility of XML-based programming paradigms.
Instructions on using the o:XML Unit Tests with sections on test-driven development, stand-alone test suites and automated tests, along with links to resources and downloads, can be found in the article Using Unit Tests.