phpunit.xml

<?xml version="1.0" encoding="utf-8"?>
<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/11.0/phpunit.xsd" bootstrap="tests/bootstrap.php" cacheDirectory=".phpunit.cache">
    <testsuites>
        <testsuite name="Unit Tests">
            <directory>tests/</directory>
        </testsuite>
    </testsuites>

    <source>
        <include>
            <directory suffix=".php">src/</directory>
        </include>
        <exclude>
            <directory suffix=".php">vendor/</directory>
        </exclude>
    </source>
</phpunit>