Add some more content-based matter tests. (#958)

* Add some more content-based matter tests.
* Check the content to further depth of details.
* Add a cautionary tale that nobody will read... :(
* Get coverage reports.
* Clean up some typos.
* Use proper English.
* Remove xvfb-run, we do not need it.
* Clean up coverage for cypress, which is not being produced.
* Add the differently-ordered list to the generation.
* Fix the code coverage job.