MediaWiki PHPUnit tests
WARNING: Integration tests may be destructive and alter or remove parts of your local database. We try to use temporary tables where possible, but you must never run tests on a production server or on a wiki where you don't want to lose data.
Running tests
If you haven't already, run composer update (specifically without --no-dev) in the MediaWiki core directory. This will install PHPUnit.
To read about how to run specific tests, refer to:
https://www.mediawiki.org/wiki/Manual:PHP_unit_testing/Running_the_tests
Writing tests
A guide to writing PHPUnit tests for MediaWiki can be found at: