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/7.3/phpunit.xsd"
         forceCoversAnnotation="false"
         beStrictAboutCoversAnnotation="true"
         beStrictAboutOutputDuringTests="true"
         beStrictAboutTodoAnnotatedTests="true"
         verbose="true"
         bootstrap="bootstrap_test.php"
>
    <testsuites>
        <testsuite name="unit">
            <directory>./tests/unit</directory>
        </testsuite>
        <testsuite name="integration">
            <directory>./tests/integration</directory>
        </testsuite>
    </testsuites>

    <filter>
        <whitelist processUncoveredFilesFromWhitelist="true" addUncoveredFilesFromWhitelist="true">
            <directory suffix=".php">./src</directory>
            <exclude>
                <directory suffix=".php">./vendor/</directory>
            </exclude>
        </whitelist>
    </filter>
</phpunit>