diff --git a/test/unittest_comment.py b/test/unittest_comment.py
index c86328d3fc66eb94c5060fa0e7dfa9909daa2f50..6939651c1c2e44d820b7667a313cfd9180041a5d 100644
--- a/test/unittest_comment.py
+++ b/test/unittest_comment.py
@@ -1,6 +1,7 @@
 import re
 from lxml import etree
 
+from cubicweb.devtools import BASE_URL
 from cubicweb.devtools.testlib import CubicWebTC
 
 from cubicweb_comment import views
@@ -125,7 +126,7 @@ Yeah !""", content_format=u"text/html", comments=c)
             # remove date
             content = re.sub('..../../.. ..:..', '', content)
             self.assertMultiLineEqual(content,
-                                      """\
+                                      f"""\
 > On  - admin wrote :
 > bouh!
 
@@ -134,7 +135,7 @@ some extra xxxxxxx. Yeah !
 
 
 i18n_by_author_field: admin
-url: http://testing.fr/cubicweb/blogentry/%s""" % self.b)
+url: {BASE_URL}blogentry/%s""" % self.b)
             # fullthreadtext_descending view
             self.assertMultiLineEqual('''On  - admin wrote :
 bouh!
@@ -195,8 +196,8 @@ bouh!
             doc = etree.fromstring(xmldata, etree.XMLParser(recover=True))
             self.assertEqual(
                 [node.text for node in doc.xpath('//guid')], [
-                    'http://testing.fr/cubicweb/comment/{}'.format(c1.eid),
-                    'http://testing.fr/cubicweb/comment/{}'.format(c2.eid),
+                    '{}comment/{}'.format(BASE_URL, c1.eid),
+                    '{}comment/{}'.format(BASE_URL, c2.eid),
                 ])
 
 
diff --git a/test/unittest_hooks.py b/test/unittest_hooks.py
index 0325d638913021f922aff10e32c65dc03bb9cf97..55b0efd8690dfacd3c35a3d6f4928fcf36b9553d 100644
--- a/test/unittest_hooks.py
+++ b/test/unittest_hooks.py
@@ -1,3 +1,4 @@
+from cubicweb.devtools import BASE_URL
 from cubicweb.devtools.testlib import CubicWebTC
 
 
@@ -17,11 +18,11 @@ class CommentViewsTC(CubicWebTC):
                                           rset=c.cw_rset, row=0)
             content = v.render(row=0)
             self.assertMultiLineEqual(content,
-                                      '''Yo !
+                                      f'''Yo !
 
 
 i18n_by_author_field: admin
-url: http://testing.fr/cubicweb/blogentry/%s''' % c.comments[0].eid)
+url: {BASE_URL}blogentry/%s''' % c.comments[0].eid)
             self.assertEqual(v.subject(), 'new comment for BlogEntry une news !')