diff --git a/Lib/test/test_xml_etree.py b/Lib/test/test_xml_etree.py
--- a/Lib/test/test_xml_etree.py
+++ b/Lib/test/test_xml_etree.py
@@ -2295,6 +2295,18 @@
             ET.tostring(root, 'utf-16'),
             b''.join(ET.tostringlist(root, 'utf-16')))
 
+    def test_write_with_declaration(self):
+        elem = ET.Element("tag")
+        elem.text = "<&\"\'>"
+        self.assertEqual(serialize(elem, xml_declaration=True),
+                "<?xml version='1.0' encoding='UTF-8'?>\n<tag>&lt;&amp;\"'&gt;</tag>")
+        self.assertEqual(serialize(elem, xml_declaration=True, encoding="utf-8"),
+                b"<?xml version='1.0' encoding='utf-8'?>\n<tag>&lt;&amp;\"'&gt;</tag>")
+        self.assertEqual(serialize(elem, xml_declaration=False),
+                "<tag>&lt;&amp;\"'&gt;</tag>")
+        self.assertEqual(serialize(elem, xml_declaration=False, encoding="utf-8"),
+                b"<tag>&lt;&amp;\"'&gt;</tag>")
+
 
 class ParseErrorTest(unittest.TestCase):
     def test_subclass(self):