--- a/cubicweb/devtools/testlib.py	Wed Jun 08 21:59:34 2016 +0200
+++ b/cubicweb/devtools/testlib.py	Mon Aug 29 12:05:11 2016 +0200
@@ -942,10 +942,8 @@
                   encapsulation the generated HTML
         """
         if req is None:
-            if rset is None:
-                req = self.request()
-            else:
-                req = rset.req
+            assert rset is not None, 'you must supply at least one of rset or req'
+            req = rset.req
         req.form['vid'] = vid
         viewsreg = self.vreg['views']
         view = viewsreg.select(vid, req, rset=rset, **kwargs)