Exceptions during code coverage driver initialization are not handled correctly

[williamdes]

Q	A
PHPUnit version	9.2.3
PHP version	8.0.0-dev
Installation Method	Composer

Summary

PHP Fatal error:  Uncaught SebastianBergmann\CodeCoverage\RuntimeException: xdebug.coverage_enable=On has to be set in php.ini in /home/runner/work/mariadb-mysql-kbs/mariadb-mysql-kbs/vendor/phpunit/php-code-coverage/src/Driver/Xdebug.php:40
Stack trace:
#0 /home/runner/work/mariadb-mysql-kbs/mariadb-mysql-kbs/vendor/phpunit/php-code-coverage/src/CodeCoverage.php(904): SebastianBergmann\CodeCoverage\Driver\Xdebug->__construct()
#1 /home/runner/work/mariadb-mysql-kbs/mariadb-mysql-kbs/vendor/phpunit/php-code-coverage/src/CodeCoverage.php(147): SebastianBergmann\CodeCoverage\CodeCoverage->selectDriver()
#2 /home/runner/work/mariadb-mysql-kbs/mariadb-mysql-kbs/vendor/phpunit/phpunit/src/TextUI/TestRunner.php(529): SebastianBergmann\CodeCoverage\CodeCoverage->__construct()
#3 /home/runner/work/mariadb-mysql-kbs/mariadb-mysql-kbs/vendor/phpunit/phpunit/src/TextUI/Command.php(108): PHPUnit\TextUI\TestRunner->run()
#4 /home/runner/work/mariadb-mysql-kbs/mariadb-mysql-kbs/vendor/phpunit/phpunit/src/TextUI/Command.php(68): PHPUnit\TextUI\Command->run()
#5 /home/runner/work/mariadb-mysql-kbs/mariadb-mysql-kbs/vendor/phpunit/phpunit/phpunit(61): PHPUnit\TextUI\Command::main()
#6 {main}
  thrown in /home/runner/work/mariadb-mysql-kbs/mariadb-mysql-kbs/vendor/phpunit/php-code-coverage/src/Driver/Xdebug.php on line 40
Script phpunit handling the test event returned with error code 255

Current behavior

Error

How to reproduce

https://github.com/williamdes/mariadb-mysql-kbs/runs/789686134?check_suite_focus=true

Expected behavior

No error as before with exact same setup https://github.com/williamdes/mariadb-mysql-kbs/runs/774446437?check_suite_focus=true#step:7:5