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# 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](https://phpunit.de/).
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:
https://www.mediawiki.org/wiki/Manual:PHP_unit_testing
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