Work in progress. :) Please see https://www.mediawiki.org/wiki/Parsoid for some information on how to get started with these tests and the current parser architecture. Install dependencies and run tests: (cd .. if you are in this README file's directory) npm test == Running parserTests.js == For parserTests, you also need MediaWiki's parser test cases (parserTests.txt). 'npm test' from the modules directory automatically fetches the current version to this directory. You can also specify a test case file as an argument. You can also symlink parserTests.txt from a core git checkout. node ./parserTests.js Several options are available for parserTests: node ./parserTests.js --help Example for round-trip testing: node ./parserTests.js --roundtrip Enjoy!