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core/Plugin/Manager.php

@@ -715,6 +715,9 @@ class Manager extends Singleton
      */
     public function getActivatedPlugins()
     {
+        if(defined('PIWIK_TEST_MODE')) {
+            return array_intersect($this->pluginsToLoad, $this->getPluginsToLoadDuringTests());
+        }
         return $this->pluginsToLoad;
     }
 

tests/PHPUnit/bootstrap.php

@@ -7,6 +7,7 @@
 use Piwik\Http;
 
 define('PIWIK_TEST_MODE', true);
+define('PIWIK_PRINT_ERROR_BACKTRACE', false);
 
 if (!defined("PIWIK_PATH_TEST_TO_ROOT")) {
     define('PIWIK_PATH_TEST_TO_ROOT', realpath(dirname(__FILE__) . '/../..'));