phpunit.xml

<phpunit
        bootstrap="tests/bootstrap.php"
        backupGlobals="false"
        colors="true"
        convertErrorsToExceptions="true"
        convertNoticesToExceptions="true"
        convertWarningsToExceptions="true"
>

    <testsuites name="General Unit tests ( Requires PHP 5.4) ">
        <testsuite >
            <directory phpVersion="5.4.0" phpVersionOperator=">=" prefix="test-"  suffix=".php">./tests/</directory>
        </testsuite>
    </testsuites>

    <testsuites name="Bail lower php versions( For PHP lower than 5.4) ">
        <testsuite>
            <directory phpVersion="5.4.0" phpVersionOperator="lt" prefix="old-"  suffix=".php">./tests/old/</directory>
        </testsuite>
    </testsuites>
</phpunit>