phpunit.xml

<?xml version="1.0" encoding="UTF-8"?>

<phpunit bootstrap = "vendor/autoload.php">

    <testsuites>
        <testsuite name="Tests">
            <directory>tests</directory>
        </testsuite>
    </testsuites>

    <php>
        <env name="APP_ENV" value="testing"/>
    </php>

    <filter>
      <whitelist processUncoveredFilesFromWhitelist="true">
        <directory suffix=".php">lib</directory>
      </whitelist>
    </filter>
</phpunit>