set error_reporting for tests

tests/unit/bootstrap.php

@@ -1,5 +1,8 @@
 <?php
 
+// ensure we get report on all possible php errors
+error_reporting(-1);
+
 define('YII_ENABLE_ERROR_HANDLER', false);
 define('YII_DEBUG', true);
 $_SERVER['SCRIPT_NAME'] = '/' . __DIR__;