Refactoring for the future and edge cases.
Writing the first integration test.
Dealing with system requirements in an acceptance test.
Passing the last functional test to know it can be done.
Rethinking the functional tests dedicated module of wp-browser.
Comparing GIF images. In a test.
And 5. Because breaking changes are bad.
Because legacy code happens. Updated.
Because WordPress needs more animated GIFs.
Small things need some test love too.