File: 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/6.5/phpunit.xsd"
         bootstrap="./vendor/autoload.php"
         forceCoversAnnotation="true"
         beStrictAboutCoversAnnotation="true"
         beStrictAboutOutputDuringTests="true"
         beStrictAboutTodoAnnotatedTests="true"
         stopOnFailure="true"
         verbose="true"
         colors="true">

    <testsuite name="default">
        <directory>tests/phpunit</directory>
    </testsuite>

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

    <logging>
        <log type="coverage-text" target="php://stdout" showUncoveredFiles="true"/>
        <log type="coverage-clover" target="resources/coverage/clover.xml"/>
    </logging>

    <php>
        <ini name="allow_url_fopen" value="On"/>
    </php>
</phpunit>