(difficulty: easy, requires a docker enabled env) Tests are covered by unit. First run - No PHP uuid extensions # export MOODLE_DOCKER_WWWROOT=/path/to/moodle # cp config.docker-template.php $MOODLE_DOCKER_WWWROOT/config.php # export MOODLE_DOCKER_DB=mysql <== Any DB Server here # bin/moodle-docker-compose up -d # bin/moodle-docker-wait-for-db # bin/moodle-docker-compose exec webserver php admin/tool/phpunit/cli/init.php # bin/moodle-docker-compose exec webserver vendor/bin/phpunit --verbose core_setuplib_testcase lib/tests/setuplib_test.php Tests should pass, mentioning one skipped test only in branch m38_MDL-61038_Fix_uuid_extensions_usage_v2 : ... There was 1 skipped test:   1) core_setuplib_testcase::test_core_uuid_generate_uuid_via_pecl_uuid_extension PHP 'uuid' extension not loaded.   /var/www/html/lib/tests/setuplib_test.php:502 /var/www/html/lib/phpunit/classes/advanced_testcase.php:80   To re-run: vendor/bin/phpunit --verbose "core_setuplib_testcase" lib/tests/setuplib_test.php   OK, but incomplete, skipped, or risky tests! Tests: 26, Assertions: 116, Skipped: 1. Second run - Install PECL uuid extension # bin/moodle-docker-compose exec webserver apt-get update # bin/moodle-docker-compose exec webserver apt-get install -y uuid-dev # bin/moodle-docker-compose exec webserver pecl install uuid # bin/moodle-docker-compose exec webserver docker-php-ext-enable uuid # bin/moodle-docker-compose exec webserver vendor/bin/phpunit --verbose core_setuplib_testcase lib/tests/setuplib_test.php Tests should pass, w/o any skipped test: ... OK (26 tests, 117 assertions) Note: numbers of tests and assertions are related to 3.8 branch ( m38_MDL-61038_Fix_uuid_extensions_usage_v2 ).