FIX: Fixed regression in test.

tests/test_server_side_scripting.py

@@ -185,7 +185,7 @@ def test_call_err():
     assert xml.xpath("/Response/script/@code")[0] == "1"
     assert xml.xpath("/Response/script/call")[0].text == "err"
     assert xml.xpath("/Response/script/stdout")[0].text is None
-    assert_stderr(xml.xpath("/Response/script/stderr")[0].text)
+    assert xml.xpath("/Response/script/stderr")[0].text == "err"
 
 
 def test_run_server_side_script_with_file_as_positional_param():