[IMP] odoo: tests: allow to compare HtmlElement trees

addTypeEqualityFunc does not work for subclasses. Therefore if we want
to be able to compare html trees we have to add the equality check for
html elements which are children of _Element.

odoo/tests/common.py

@@ -18,7 +18,7 @@ import itertools
 import unittest
 from contextlib import contextmanager
 from datetime import datetime, timedelta
-from lxml import etree
+from lxml import etree, html
 from pprint import pformat
 
 import requests
@@ -93,6 +93,7 @@ class TreeCase(unittest.TestCase):
     def __init__(self, methodName='runTest'):
         super(TreeCase, self).__init__(methodName)
         self.addTypeEqualityFunc(etree._Element, self.assertTreesEqual)
+        self.addTypeEqualityFunc(html.HtmlElement, self.assertTreesEqual)
 
     def assertTreesEqual(self, n1, n2, msg=None):
         self.assertEqual(n1.tag, n2.tag, msg)