fix testing deprecation messages

* always restore the previous error handler
* throw `LogicExcetion` when unexpected error type is triggered

Author: xabbuh

Tests/Templating/TemplateNameParserTest.php

@@ -91,7 +91,9 @@ public function testAbsolutePathsAreDeprecated($name, $logicalName, $path, $ref)
         $deprecations = array();
         set_error_handler(function ($type, $msg) use (&$deprecations) {
             if (E_USER_DEPRECATED !== $type) {
-                throw new \LogicException(sprintf('Unexpected error: "%s".', $msg));
+                restore_error_handler();
+
+                return call_user_func_array('PHPUnit_Util_ErrorHandler::handleError', func_get_args());
             }
 
             $deprecations[] = $msg;