diff -r 3f125fdbcd70 -r ba5231e1aa45 cubicweb/dataimport/test/unittest_importer.py
--- a/cubicweb/dataimport/test/unittest_importer.py	Thu May 16 14:26:38 2019 +0200
+++ b/cubicweb/dataimport/test/unittest_importer.py	Tue May 21 10:50:08 2019 +0200
@@ -196,6 +196,12 @@
         personne.values.pop('cwuri')
         list(set_cwuri((personne,)))
         self.assertNotIn('cwuri', personne.values)
+        personne = ExtEntity('Personne', u'ééé', {})
+        mapping = {}
+        set_cwuri = use_extid_as_cwuri(mapping)
+        list(set_cwuri((personne,)))
+        self.assertIn('cwuri', personne.values)
+        self.assertEqual(personne.values['cwuri'], set([u'ééé']))
 
 
 class DropExtraValuesTC(CubicWebTC):