A) General Verify that complete PHPUnit runs are passing (GHA, ToBiC...) for all branches. B) Testing instructions for MOODLE_311_STABLE and master Install local_codechecker in the site. Init phpunit: php admin/tool/phpunit/cli/init.php Run this (see the important note below about the HEAD alternatives and commits): git show --pretty="" --name-only HEAD~2 | \ xargs local/codechecker/phpcs/bin/phpcs --standard=moodle --extensions=php \ --sniffs=moodle.PHPUnit.TestCaseNames -p && echo "Yay!" Verify that you get 138 (for master) dots in the output, without any error and with "Yay!" printed at the end. For 311_STABLE instead of 138 you should get 111 dots. Run this (see the important note below about the HEAD alternatives and commits): git show --pretty="" --name-only HEAD~2 | \ xargs -n 1 -I {} bash -c "echo {}; vendor/bin/phpunit {} > /dev/null || echo ERRORs!" Verify that you don't get any "ERRORs!" output, that means that all the tests modified can be run individually. Important Note : the HEAD~2 in the above commands assumes that the branches have been integrated without any merge commit. You may need to replace them by the real commits if the issue has been integrated with merge commit. Here there are the commit details: 311_STABLE: HEAD~2 = 2c30590 master: HEAD~2 = deb0e76 C) Testing instructions for MOODLE_310_STABLE Init phpunit: php admin/tool/phpunit/cli/init.php Run: vendor/bin/phpunit payment/tests/helper_test.php Verify that it finishes Ok (13 tests). Run: vendor/bin/phpunit payment/tests/generator_test.php Verify that it finishes Ok (2 tests). Run: vendor/bin/phpunit --testsuite core_payment_testsuite Verify that it finishes Ok (15 tests). Note : If you get some of these tests marked as skipped, surely it's because your system is using old ICU libraries. Please, check that you're using ICU 62 or newer.