diff --git a/ckan/tests/lib/test_datapreview.py b/ckan/tests/lib/test_datapreview.py
index 2b39e6f7c78..ee41a7d5851 100644
--- a/ckan/tests/lib/test_datapreview.py
+++ b/ckan/tests/lib/test_datapreview.py
@@ -1,23 +1,25 @@
 import ckan.lib.datapreview as datapreview
 
+
 class TestDataPreview():
     def test_compare_domains(self):
         ''' see https://en.wikipedia.org/wiki/Same_origin_policy
         '''
         comp = datapreview.compare_domains
-        assert comp(['http://www.okfn.org', 'http://www.okfn.org']) == True
-        assert comp(['http://www.okfn.org', 'http://www.okfn.org', 'http://www.okfn.org']) == True
-        assert comp(['http://www.OKFN.org', 'http://www.okfn.org', 'http://www.okfn.org/test/foo.html']) == True
-        assert comp(['http://okfn.org', 'http://okfn.org']) == True
-        assert comp(['www.okfn.org', 'http://www.okfn.org']) == True
-        assert comp(['//www.okfn.org', 'http://www.okfn.org']) == True
+        assert comp(['http://www.okfn.org', 'http://www.okfn.org']) is True
+        assert comp(['http://www.okfn.org', 'http://www.okfn.org', 'http://www.okfn.org']) is True
+        assert comp(['http://www.OKFN.org', 'http://www.okfn.org', 'http://www.okfn.org/test/foo.html']) is True
+        assert comp(['http://okfn.org', 'http://okfn.org']) is True
+        assert comp(['www.okfn.org', 'http://www.okfn.org']) is True
+        assert comp(['//www.okfn.org', 'http://www.okfn.org']) is True
+
+        assert comp(['http://www.okfn.org', 'https://www.okfn.org']) is False
+        assert comp(['http://www.okfn.org:80', 'http://www.okfn.org:81']) is False
+        assert comp(['http://www.okfn.org', 'http://www.okfn.de']) is False
+        assert comp(['http://de.okfn.org', 'http://www.okfn.org']) is False
 
-        assert comp(['http://www.okfn.org', 'https://www.okfn.org']) == False
-        assert comp(['http://www.okfn.org:80', 'http://www.okfn.org:81']) == False
-        assert comp(['http://www.okfn.org', 'http://www.okfn.de']) == False
-        assert comp(['http://de.okfn.org', 'http://www.okfn.org']) == False
+        assert comp(['http://de.okfn.org', 'http:www.foo.com']) is False
 
-        assert comp(['http://de.okfn.org', 'http:www.foo.com']) == False
 
         # Wrong URL. Makes urlparse choke
-        assert comp(['http://Server=cda3; Service=sde:sqlserver:cda3; Database=NationalDatasets; User=sde; Version=sde.DEFAULT', 'http://www.okf.org']) == False
+        assert comp(['http://Server=cda3; Service=sde:sqlserver:cda3; Database=NationalDatasets; User=sde; Version=sde.DEFAULT', 'http://www.okf.org']) is False