ListToggle class should have PHPUnit tests
In MediaWiki core, the
ListToggle class does not have any tests.
If you're not already familiar with PHPUnit tests, https://www.mediawiki.org/wiki/Manual:PHP_unit_testing/Writing_unit_tests has links to some good material on the basics of testing.
I would also recommend looking at other tests in the
tests/phpunit/includes/ directory of MediaWiki core for an example of how we currently test classes.
You are expected to provide a patch in Wikimedia Gerrit. See https://www.mediawiki.org/wiki/Gerrit/Tutorial for how to set up Git and Gerrit.