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):
</div><div class="naked_ctrl">
<form action="/index.cgi/contrast" method="get" name="gate">
<p><a href="http://altstyle.alfasado.net">AltStyle</a> によって変換されたページ <a href="https://bugs.python.org/file27046/xml_declaration_test.patch">(-&gt;オリジナル)</a>
/ <label>アドレス: <input type="text" name="naked_post_url" value="https://bugs.python.org/file27046/xml_declaration_test.patch" size="22" /></label> <label>モード: <select name="naked_post_mode">
<option value="default">デフォルト</option>
<option value="speech">音声ブラウザ</option>
<option value="ruby">ルビ付き</option>
<option value="contrast" selected="selected">配色反転</option>
<option value="larger-text">文字拡大</option>
<option value="mobile">モバイル</option>
</select>
<input type="submit" value="表示" />
</p>
</form>
</div>