`--list-tests-xml` is broken when a group with a numeric name is defined

[mondrake]

Q	A
PHPUnit version	11.5.2
PHP version	8.3
Installation Method	Composer

Summary

If a @group annotation specifies a numeric group (for example, 44), running PHPUnit 11 with the --list-tests-xml leads to an internal error. Same if you specify a corresponding group attribute #[Group('44')]. PHPUnit 10 is not affected.

PHPUnit 11.5.2 by Sebastian Bergmann and contributors.



An error occurred inside PHPUnit.

Message:  XMLWriter::writeAttribute(): Argument #2 ($value) must be of type string, int given
Location: vendor/phpunit/phpunit/src/TextUI/Command/Commands/ListTestsAsXmlCommand.php:111

#0 vendor/phpunit/phpunit/src/TextUI/Command/Commands/ListTestsAsXmlCommand.php(111): XMLWriter->writeAttribute('name', 44)
#1 vendor/phpunit/phpunit/src/TextUI/Application.php(326): PHPUnit\TextUI\Command\ListTestsAsXmlCommand->execute()
#2 vendor/phpunit/phpunit/src/TextUI/Application.php(520): PHPUnit\TextUI\Application->execute(Object(PHPUnit\TextUI\Command\ListTestsAsXmlCommand), true)
#3 vendor/phpunit/phpunit/src/TextUI/Application.php(183): PHPUnit\TextUI\Application->executeCommandsThatRequireTheTestSuite(Object(PHPUnit\TextUI\Configuration\Configuration), Object(PHPUnit\TextUI\CliArguments\Configuration), Object(PHPUnit\Framework\TestSuite))
#4 vendor/phpunit/phpunit/phpunit(104): PHPUnit\TextUI\Application->run(Array)
#5 vendor/bin/phpunit(122): include('/builds/issue/d...')
#6 {main}

Current behavior

See above

How to reproduce

See above

Expected behavior

No error and list printed or saved to file.

[sebastianbergmann]

Thank you for your report.

Please provide a minimal, self-contained, reproducing test case that shows the problem you are reporting.

Without such a minimal, self-contained, reproducing test case I will not be able to investigate this issue.