Prevent DB connection in unit tests

qa-tests/autoload.php

@@ -6,4 +6,5 @@ global $qa_options_cache;
 // Needed in order to avoid accessing the database while including the qa-base.php file
 $qa_options_cache['enabled_plugins'] = '';
 
+$qa_autoconnect = false;
 require_once __DIR__.'/../qa-include/qa-base.php';