refs #3227 unset pdf reports cache after each integration test

git-svn-id: http://dev.piwik.org/svn/trunk@6892 59fd770c-687e-43c8-a1e3-f5a4ff64c105

tests/PHPUnit/IntegrationTestCase.php

@@ -97,6 +97,7 @@ abstract class IntegrationTestCase extends PHPUnit_Framework_TestCase
         Piwik_Common::deleteTrackerCache();
         Piwik_Config::getInstance()->clear();
         Piwik_TablePartitioning::$tablesAlreadyInstalled = null;
+        Piwik_PDFReports_API::$cache = array();
         Zend_Registry::_unsetInstance();
 
         $_GET = $_REQUEST = array();