256     @tag('expires')

   257     def test_expires_added(self):

   258         #: Check that Expires header is added:

   259         #: - when the page is modified

   260         #: - when none was already present

   261         hin  = [('if-none-match', 'babar'),

   262                ]

   263         hout = [('etag', 'rhino/really-not-babar'),

   264                ]

   265         req = _test_cache(hin, hout)

   266         self.assertCache(None, req.status_out, 'modifier HEAD verb')

   267         value = req.headers_out.getHeader('expires')

   268         self.assertIsNotNone(value)

   269 

   270     @tag('expires')

   271     def test_expires_not_added(self):

   272         #: Check that Expires header is not added if NOT-MODIFIED

   273         hin  = [('if-none-match', 'babar'),

   274                ]

   275         hout = [('etag', 'babar'),

   276                ]

   277         req = _test_cache(hin, hout)

   278         self.assertCache(304, req.status_out, 'not modifier HEAD verb')

   279         value = req.headers_out.getHeader('expires')

   280         self.assertIsNone(value)

   281 

   282     @tag('expires')

   283     def test_expires_no_overwrite(self):

   284         #: Check that cache does not overwrite existing Expires header

   285         hin  = [('if-none-match', 'babar'),

   286                ]

   287         DATE = 'Sat, 13 Apr 2012 14:39:32 GM'

   288         hout = [('etag', 'rhino/really-not-babar'),

   289                 ('expires', DATE),

   290                ]

   291         req = _test_cache(hin, hout)

   292         self.assertCache(None, req.status_out, 'not modifier HEAD verb')

   293         value = req.headers_out.getRawHeaders('expires')

   294         self.assertEqual(value, [DATE])

   295