File: phpunit.xml

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