diff --git a/Lib/test/test_xml_etree.py b/Lib/test/test_xml_etree.py
index f83db7f..77202d2 100644
--- a/Lib/test/test_xml_etree.py
+++ b/Lib/test/test_xml_etree.py
@@ -377,6 +377,14 @@ class ElementTreeTest(unittest.TestCase):
         self.assertEqual(ET.tostring(elem),
                 b'<test testa="testval" testb="test1" testc="test2">aa</test>')
 
+        elem = ET.Element('test')
+        elem.set('a', '\r')
+        elem.set('b', '\r\n')
+        elem.set('c', '\t\n\r ')
+        elem.set('d', '\n\n')
+        self.assertEqual(ET.tostring(elem),
+                b'<test a="&#10;" b="&#10;" c="&#09;&#10;&#10; " d="&#10;&#10;" />')
+
     def test_makeelement(self):
         # Test makeelement handling.