test_web.py: fix test_GET_DIRECTORY_html_filenode_encoding for Twiste…

…d==12.3.0. fixes #1922

twisted.web.html.escape was used to produce html-encoded string (to then look
it up in "value" attribute), but behavior of that function has changed between
Twisted 12.2.0 (simple custom implementation) and 12.3.0 (imported from stdlib
cgi module).

src/allmydata/test/test_web.py

@@ -1,12 +1,12 @@
-import os.path, re, urllib, time
+import os.path, re, urllib, time, cgi
 import simplejson
 from StringIO import StringIO
 
 from twisted.application import service
 from twisted.trial import unittest
 from twisted.internet import defer, reactor
 from twisted.internet.task import Clock
-from twisted.web import client, error, http, html
+from twisted.web import client, error, http
 from twisted.python import failure, log
 
 from foolscap.api import fireEventually, flushEventualQueue
@@ -324,8 +324,8 @@ def _then(res):
             self._htmlname_raw = self._htmlname_unicode.encode('utf-8')
             self._htmlname_urlencoded = urllib.quote(self._htmlname_raw, '')
             self._htmlname_escaped = escapeToXML(self._htmlname_raw)
-            self._htmlname_escaped_attr = html.escape(self._htmlname_raw)
-            self._htmlname_escaped_double = escapeToXML(html.escape(self._htmlname_raw))
+            self._htmlname_escaped_attr = cgi.escape(self._htmlname_raw, quote=True)
+            self._htmlname_escaped_double = escapeToXML(cgi.escape(self._htmlname_raw, quote=True))
             self.HTMLNAME_CONTENTS, n, self._htmlname_txt_uri = self.makefile(0)
             foo.set_uri(self._htmlname_unicode, self._htmlname_txt_uri, self._htmlname_txt_uri)