The document discusses various methods for automated testing of DITA content and output, including using Schematron for validating content structure, the QA plugin for identifying tagging errors, XMLUnit for comparing XML, and the DITA OT regression test for validating the output of the open-source DITA Open Toolkit. It also covers automating browser tests using Selenium and comparing HTML output using Needle and Nose. Demo examples are provided for several of these automated testing tools and techniques.