diff -r 534efa7bfaeb -r eacb8ea38bf5 devtools/test/unittest_testlib.py
--- a/devtools/test/unittest_testlib.py	Thu Feb 05 19:36:49 2015 +0100
+++ b/devtools/test/unittest_testlib.py	Wed Feb 25 17:13:46 2015 +0100
@@ -28,6 +28,25 @@
 from cubicweb.devtools.testlib import CubicWebTC
 from cubicweb.pytestconf import clean_repo_test_cls
 
+class FakeFormTC(TestCase):
+    def test_fake_form(self):
+        class entity:
+            cw_etype = 'Entity'
+            eid = 0
+        sio = StringIO('hop\n')
+        form = CubicWebTC.fake_form('import',
+                                    {'file': ('filename.txt', sio),
+                                     'encoding': u'utf-8',
+                                    }, [(entity, {'field': 'value'})])
+        self.assertEqual(form, {'__form_id': 'import',
+                                '__maineid': 0,
+                                '__type:0': 'Entity',
+                                '_cw_entity_fields:0': '__type,field',
+                                '_cw_fields': 'file,encoding',
+                                'eid': [0],
+                                'encoding': u'utf-8',
+                                'field:0': 'value',
+                                'file': ('filename.txt', sio)})
 
 class WebTestTC(TestCase):