Tests: as of PHPUnit 10 data provider methods should be static #172
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Per the PHPUnit manual: "A data provider method must be public and static" (https://docs.phpunit.de/en/12.0/writing-tests-for-phpunit.html).
A similar change was done in the PHPCS repository: PHPCSStandards/PHP_CodeSniffer#255
Tests will continue to work when running with PHPUnit < 10.