Fix the test for WebDAV.

See merge request nexedi/erp5!1926

bt5/erp5_dms/TestTemplateItem/portal_components/test.erp5.testWebDavSupport.py

@@ -39,6 +39,7 @@ from DateTime import DateTime
 
 from lxml import etree
 from six.moves import range
+from Products.ERP5Type.Utils import unicode2str
 
 def makeFilePath(name):
   import Products.ERP5.tests
@@ -207,7 +208,7 @@ class TestWebDavSupport(ERP5TypeTestCase):
     # Convert to base format and run conversion into utf-8
     self.tic()
     # Content-Type header is replaced if conversion encoding succeed
-    new_text_content = text_content.replace('charset=iso-8859-1', 'charset=utf-8')
+    new_text_content = unicode2str(text_content).replace('charset=iso-8859-1', 'charset=utf-8')
     self.assertEqual(web_page_module[filename].getTextContent(), new_text_content)
 
   def test_GET_on_document(self):