phpunit.xml

<?xml version="1.0" encoding="UTF-8"?>
<!--
  xsi:noNamespaceSchemaLocation points at the 10.5 schema even though
  composer.json allows PHPUnit ^9.6 for PHP 7.4/8.0 (PHPUnit 10.5 itself
  requires PHP >=8.1). This is intentional, not a mismatch to "fix":
  that attribute is only an editor/IDE hint for autocomplete - PHPUnit
  validates this file at runtime against its own bundled schema
  regardless of what URL is written here (confirmed when upgrading:
  PHPUnit 9.6 correctly rejected `failOnDeprecation`, a 10.x-only
  attribute, even with this same 10.5 URL still in place). Pointing it
  at whichever version most contributors are likely to have installed
  locally is more useful than picking one arbitrarily.
-->
<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.5/phpunit.xsd"
         bootstrap="tests/unit/bootstrap.php"
         colors="true"
         failOnWarning="true">
    <testsuites>
        <testsuite name="unit">
            <directory>tests/unit</directory>
        </testsuite>
    </testsuites>
</phpunit>