Placeholder ticket for patches that do nothing but touching tests (a.k.a. "technical stories"). They have all been created with a user story in mind, but don't actually solve a story.
 Code coverage is good enough to make us feel comfortable doing estimations and making promises.
 All patches are resolved before the next #WMDE-QWERTY-Sprint-2019-02-06 starts.
 **TODO:** Integration tests for fake references like `<span class="reference">[[Foo#bar]]</span>` and other random stuff as listed on https://tools.wmflabs.org/wmde-reference-previews/core/index.php?title=Monkey_testing.