def test_default_error_handler_calls_default_renderer(self):
# Default error handler should call `render_errors` on the
# registered renderer.
service = Service("error service", "/error_service")
renderer = mock.MagicMock()
renderer.render_errors.return_value = "rendered_errors"
request = mock.MagicMock()
request.registry.queryUtility.return_value = renderer
self.assertEqual(service.default_error_handler(request),
"rendered_errors")
request.registry.queryUtility.assert_called_with(IRendererFactory,
name=service.renderer)
renderer.render_errors.assert_called_with(request)
