diff --git a/plone/app/discussion/tests/test_functional.py b/plone/app/discussion/tests/test_functional.py
index 6c1a17b..7cb83c6 100644
--- a/plone/app/discussion/tests/test_functional.py
+++ b/plone/app/discussion/tests/test_functional.py
@@ -1,12 +1,23 @@
+# -*- coding: utf-8 -*-
+"""Functional Doctests for plone.app.discussion.
+
+   These test are only triggered when Plone 4 (and plone.testing) is installed.
+"""
 import doctest
-import unittest2 as unittest
-import pprint
-import interlude
 
-from plone.testing import layered
-
-from plone.app.discussion.testing import \
-    PLONE_APP_DISCUSSION_FUNCTIONAL_TESTING
+try:
+    import unittest2 as unittest
+    import pprint
+    import interlude
+    
+    from plone.testing import layered
+    
+    from plone.app.discussion.testing import \
+        PLONE_APP_DISCUSSION_FUNCTIONAL_TESTING
+    PLONE4 = True
+except:
+    import unittest
+    PLONE4 = False
 
 optionflags = (doctest.ELLIPSIS | doctest.NORMALIZE_WHITESPACE | doctest.REPORT_ONLY_FIRST_FAILURE)
 normal_testfiles = [
@@ -14,15 +25,25 @@ normal_testfiles = [
     'functional_test_comment_review_workflow.txt'
 ]
 
-def test_suite():
-    suite = unittest.TestSuite()
-    suite.addTests([
-        layered(doctest.DocFileSuite(test ,
-                                     optionflags=optionflags,
-                                     globs={'interact': interlude.interact,
-                                            'pprint': pprint.pprint,
-                                            }
-                                     ),
-                layer=PLONE_APP_DISCUSSION_FUNCTIONAL_TESTING)
-        for test in normal_testfiles])
-    return suite
+if PLONE4:
+        
+    def test_suite():
+        suite = unittest.TestSuite()
+        suite.addTests([
+            layered(doctest.DocFileSuite(test ,
+                                         optionflags=optionflags,
+                                         globs={'interact': interlude.interact,
+                                                'pprint': pprint.pprint,
+                                                }
+                                         ),
+                    layer=PLONE_APP_DISCUSSION_FUNCTIONAL_TESTING)
+            for test in normal_testfiles])
+        return suite
+
+else:
+    
+    def test_suite():
+        return unittest.TestSuite([])
+    
+    if __name__ == '__main__':
+        unittest.main(defaultTest='test_suite')