updated tests -. fix

Author: sreichel

app/code/core/Mage/Reports/Model/Resource/Report/Collection.php

@@ -39,7 +39,7 @@ class Mage_Reports_Model_Resource_Report_Collection
     /**
      * Report period
      *
-     * @var int
+     * @var string
      */
     protected $_period;
 
@@ -76,7 +76,7 @@ protected function _construct() {}
     /**
      * Set period
      *
-     * @param int $period
+     * @param string $period
      * @return $this
      */
     public function setPeriod($period)