When building a server-side rendered web application, it's valuable to test the HTML that's generated through templates. While these can be tested through end-to-end tests running in the browser, such tests are slow and more work to maintain than unit tests. My colleague Matteo Vaccari has written an article on how to use TDD to test drive these templates using xunit-style tools which can be run easily from the command line or as part of build scripts.In this first installment Matteo describes how such tests can check the generated HTML for validity, with examples in Java and Go.