Configuration validation fails when using brackets in glob pattern

[JaZo]

Q	A
PHPUnit version	9.5.8
PHP version	7.4.3
Installation Method	Composer

Composer info

bacon/bacon-qr-code                     2.0.4      
barryvdh/laravel-debugbar               v3.6.2     
barryvdh/laravel-ide-helper             v2.10.0    
barryvdh/reflection-docblock            v2.0.6
bepsvpt/secure-headers                  7.1.0      
brick/math                              0.9.2      
bugsnag/bugsnag-laravel                 v2.22.1    
bugsnag/bugsnag-psr-logger              v1.4.3     
bugsnag/bugsnag                         v3.26.0    
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composer/ca-bundle                      1.2.10     
composer/composer                       2.1.5      
composer/metadata-minifier              1.0.0      
composer/package-versions-deprecated    1.11.99.2  
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composer/spdx-licenses                  1.5.5      
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danielstjules/stringy                   3.1.0      
dasprid/enum                            1.0.3      
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doctrine/annotations                    1.13.1     
doctrine/cache                          2.1.1      
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doctrine/deprecations                   v0.5.3     
doctrine/event-manager                  1.1.1      
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doctrine/instantiator                   1.4.0      
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dragonmantank/cron-expression           v3.1.0     
egulias/email-validator                 2.1.25     
facade/flare-client-php                 1.8.1      
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fakerphp/faker                          v1.15.0    
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hamcrest/hamcrest-php                   v2.0.1     
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justinrainbow/json-schema               5.2.11     
kevinrob/guzzle-cache-middleware        v3.4.0     
laracasts/flash                         3.2        
laracasts/presenter                     0.2.4      
laravelcollective/html                  v6.2.1     
laravel/framework                       v8.53.0    
laravel/tinker                          v2.6.1     
league/commonmark                       2.0.1      
league/config                           v1.1.0     
league/flysystem                        1.1.4      
league/fractal                          0.19.2     
league/mime-type-detection              1.7.0      
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limedeck/phpunit-detailed-printer       6.0.0      
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phpunit/php-invoker                     3.1.1      
phpunit/php-text-template               2.0.4      
phpunit/php-timer                       5.0.3      
phpunit/phpunit                         9.5.8      
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sebastian/version                       3.0.2      
seld/jsonlint                           1.8.3      
seld/phar-utils                         1.1.1      
spatie/fractalistic                     2.9.1      
spatie/laravel-fractal                  5.8.1      
swiftmailer/swiftmailer                 v6.2.7     
swisnl/guzzle-fixture-handler           2.3.0      
swisnl/illuminate-collections           8.0.0      
swisnl/json-api-client                  2.0.0-beta 
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swisnl/laravel-javascript-data-response 1.4.0      
swisnl/php-cs-fixer-config              1.3.0      
swisnl/php-http-fixture-client          2.3.0      
symfony/console                         v5.3.6     
symfony/css-selector                    v5.3.4     
symfony/debug                           v4.4.27    
symfony/deprecation-contracts           v2.4.0     
symfony/dom-crawler                     v5.3.4     
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symfony/event-dispatcher-contracts      v2.4.0     
symfony/event-dispatcher                v5.3.4     
symfony/filesystem                      v5.3.4     
symfony/finder                          v5.3.4     
symfony/http-client-contracts           v2.4.0     
symfony/http-foundation                 v5.3.6     
symfony/http-kernel                     v5.3.6     
symfony/mime                            v5.3.4     
symfony/options-resolver                v5.3.4     
symfony/polyfill-ctype                  v1.23.0    
symfony/polyfill-iconv                  v1.23.0    
symfony/polyfill-intl-grapheme          v1.23.1    
symfony/polyfill-intl-idn               v1.23.0    
symfony/polyfill-intl-normalizer        v1.23.0    
symfony/polyfill-mbstring               v1.23.1    
symfony/polyfill-php72                  v1.23.0    
symfony/polyfill-php73                  v1.23.0    
symfony/polyfill-php80                  v1.23.1    
symfony/process                         v5.3.4     
symfony/routing                         v5.3.4     
symfony/service-contracts               v2.4.0     
symfony/stopwatch                       v5.3.4     
symfony/string                          v5.3.3     
symfony/translation-contracts           v2.4.0     
symfony/translation                     v5.3.4     
symfony/var-dumper                      v5.3.6     
theseer/tokenizer                       1.2.1      
tijsverkoyen/css-to-inline-styles       2.2.3      
vlucas/phpdotenv                        v5.3.0     
voku/portable-ascii                     1.5.6      
webmozart/assert                        1.10.0     

Summary

Configuration validation fails when using brackets (character group) in glob pattern.

Current behavior

Warning - The configuration file did not pass validation!
The following problems have been detected:

Line 7:
- Element 'directory': './tests/[a-h]*' is not a valid value of the atomic type 'xs:anyURI'.

Line 11:
- Element 'exclude': './tests/[a-h]*' is not a valid value of the atomic type 'xs:anyURI'.

Test results may not be as expected.

Despite the warning, it does work as expected.

How to reproduce

$ tree
.
├── phpunit.xml
└── tests
    ├── one
    │   └── OneTest.php
    └── two
        └── TwoTest.php

<?xml version="1.0" encoding="UTF-8"?>
<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd"
         verbose="true">
    <testsuites>
      <testsuite name="A">
        <directory>./tests/[a-h]*</directory>
      </testsuite>
      <testsuite name="B">
        <directory>./tests</directory>
        <exclude>./tests/[a-h]*</exclude>
      </testsuite>
  </testsuites>
</phpunit>

Expected behavior

No configuration validation warning.