prefer phpunit 5.x on hhvm

Author: Michal Piotrowski

phpunit

@@ -18,8 +18,8 @@ use Symfony\Component\Process\ProcessUtils;
 error_reporting(-1);
 require __DIR__.'/src/Symfony/Component/Process/ProcessUtils.php';
 
-// PHPUnit 4.8 does not support PHP 7, while 5.0 requires PHP 5.6+
-$PHPUNIT_VERSION = PHP_VERSION_ID >= 70000 ? '5.0' : '4.8';
+// PHPUnit 4.8 does not support PHP 7, while 5.1 requires PHP 5.6+
+$PHPUNIT_VERSION = PHP_VERSION_ID >= 50600 ? '5.1' : '4.8';
 $PHPUNIT_DIR = __DIR__.'/.phpunit';
 $PHP = defined('PHP_BINARY') ? PHP_BINARY : 'php';
 $PHP = ProcessUtils::escapeArgument($PHP);