phpunit.xml.dist
<?xml version="1.0" encoding="UTF-8"?>
<phpunit colors="true"
convertErrorsToExceptions="true"
convertNoticesToExceptions="true"
convertWarningsToExceptions="true">
<testsuites>
<testsuite>
<directory>tests</directory>
</testsuite>
</testsuites>
<filter>
<whitelist>
<directory suffix=".php">src</directory>
</whitelist>
</filter>
</phpunit>