The tests don't appear to run on PHPUnit 10+:

[NielBuys]

          @NielBuys Heads up, the tests don't appear to run on PHPUnit 10+:

$ composer run test:coverage
> @putenv XDEBUG_MODE=coverage
> phpunit --color=always --coverage-text --configuration tests/phpunit.xml
PHP Fatal error:  Cannot override final method PHPUnit\Framework\TestCase::runBare() in /home/jamie/projects/CodeIgniter/tests/mocks/ci_testcase.php on line 349

Fatal error: Cannot override final method PHPUnit\Framework\TestCase::runBare() in /home/jamie/projects/CodeIgniter/tests/mocks/ci_testcase.php on line 349
Script phpunit --color=always --coverage-text --configuration tests/phpunit.xml handling the test:coverage event returned with error code 255

Originally posted by @jamieburchell in #2 (comment)