rector/phpunit.xml

<phpunit
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:noNamespaceSchemaLocation="vendor/phpunit/phpunit/phpunit.xsd"
    bootstrap="tests/bootstrap.php"
    colors="true"
    verbose="true"
>
    <testsuites>
        <testsuite name="main">
            <directory>packages/*/tests</directory>
            <directory>tests</directory>
            <exclude>packages/ContributorTools/templates/*</exclude>
        </testsuite>
    </testsuites>

    <filter>
        <whitelist addUncoveredFilesFromWhitelist="false">
            <directory suffix="*.php">packages/*/src</directory>
            <directory>src</directory>
            <exclude>
                <directory>../tests/**/*Source/**</directory>
            </exclude>
        </whitelist>
    </filter>
</phpunit>