diff --git a/tests/syndication_tests/tests.py b/tests/syndication_tests/tests.py
index e98ac354b0..043533d943 100644
--- a/tests/syndication_tests/tests.py
+++ b/tests/syndication_tests/tests.py
@@ -495,27 +495,14 @@ class SyndicationFeedTest(FeedTestCase):
         """
         add_domain() prefixes domains onto the correct URLs.
         """
-        self.assertEqual(
-            views.add_domain('example.com', '/foo/?arg=value'),
-            'http://example.com/foo/?arg=value'
-        )
-        self.assertEqual(
-            views.add_domain('example.com', '/foo/?arg=value', True),
-            'https://example.com/foo/?arg=value'
-        )
-        self.assertEqual(
-            views.add_domain('example.com', 'http://djangoproject.com/doc/'),
-            'http://djangoproject.com/doc/'
-        )
-        self.assertEqual(
-            views.add_domain('example.com', 'https://djangoproject.com/doc/'),
-            'https://djangoproject.com/doc/'
-        )
-        self.assertEqual(
-            views.add_domain('example.com', 'mailto:uhoh@djangoproject.com'),
-            'mailto:uhoh@djangoproject.com'
-        )
-        self.assertEqual(
-            views.add_domain('example.com', '//example.com/foo/?arg=value'),
-            'http://example.com/foo/?arg=value'
+        prefix_domain_mapping = (
+            (('example.com', '/foo/?arg=value'), 'http://example.com/foo/?arg=value'),
+            (('example.com', '/foo/?arg=value', True), 'https://example.com/foo/?arg=value'),
+            (('example.com', 'http://djangoproject.com/doc/'), 'http://djangoproject.com/doc/'),
+            (('example.com', 'https://djangoproject.com/doc/'), 'https://djangoproject.com/doc/'),
+            (('example.com', 'mailto:uhoh@djangoproject.com'), 'mailto:uhoh@djangoproject.com'),
+            (('example.com', '//example.com/foo/?arg=value'), 'http://example.com/foo/?arg=value'),
         )
+        for prefix in prefix_domain_mapping:
+            with self.subTest(prefix=prefix):
+                self.assertEqual(views.add_domain(*prefix[0]), prefix[1])