phpunit.xml

<?xml version="1.0" encoding="UTF-8"?>
<phpunit backupStaticAttributes="false"
         backupGlobals="false"
         cacheTokens="false"
         colors="true"
         convertErrorsToExceptions="true"
         convertNoticesToExceptions="true"
         convertWarningsToExceptions="true"
         forceCoversAnnotation="false"
         mapTestClassNameToCoveredClassName="false"
         processIsolation="false"
         stopOnError="false"
         stopOnFailure="false"
         stopOnIncomplete="false"
         stopOnSkipped="false">
    <testsuites>
        <testsuite name="Main suite">
            <directory suffix=".php">tests/</directory>
        </testsuite>
    </testsuites>

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