hdk-skeleton/phpunit.xml

<?xml version="1.0" encoding="UTF-8"?>
<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         bootstrap="./test/bootstrap.php"
         colors="true"
         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd">
    <coverage processUncoveredFiles="true">
        <include>
            <directory suffix=".php">./app</directory>
        </include>
    </coverage>
    <testsuites>
        <testsuite name="Tests">
            <directory>./test</directory>
        </testsuite>
    </testsuites>
</phpunit>