phpunit.xml
<phpunit
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/4.5/phpunit.xsd">
<testsuites>
<testsuite name="Colourist">
<directory>tests</directory>
</testsuite>
</testsuites>
<filter>
<whitelist processUncoveredFilesFromWhitelist="true">
<directory suffix=".php">lib</directory>
</whitelist>
</filter>
</phpunit>