[tests] Add subtests to TestUserContribsWithoutUser.test_user_prefix

Change-Id: Ia7d8e52b64fb5dc0994b95fcbb6290b9dcc3cd5a
---
M tests/site_generators_tests.py
1 file changed, 28 insertions(+), 16 deletions(-)

diff --git a/tests/site_generators_tests.py b/tests/site_generators_tests.py
index 2f5a68a..2f5888a 100755
--- a/tests/site_generators_tests.py
+++ b/tests/site_generators_tests.py
@@ -1183,27 +1183,30 @@
         """Test the site.usercontribs() method."""
         mysite = self.get_site()
         start = '2008-10-06T01:02:03Z'
-        for contrib in mysite.usercontribs(
-                userprefix='Jane',
-                start=pywikibot.Timestamp.fromISOformat(start),
-                total=5):
-            self.assertLessEqual(contrib['timestamp'], start)
+        with self.subTest(start=start):
+            for contrib in mysite.usercontribs(
+                    userprefix='Jane',
+                    start=pywikibot.Timestamp.fromISOformat(start),
+                    total=5):
+                self.assertLessEqual(contrib['timestamp'], start)
 
         end = '2008-10-07T02:03:04Z'
-        for contrib in mysite.usercontribs(
-                userprefix='Jane',
-                end=pywikibot.Timestamp.fromISOformat(end),
-                total=5):
-            self.assertGreaterEqual(contrib['timestamp'], end)
+        with self.subTest(end=end):
+            for contrib in mysite.usercontribs(
+                    userprefix='Jane',
+                    end=pywikibot.Timestamp.fromISOformat(end),
+                    total=5):
+                self.assertGreaterEqual(contrib['timestamp'], end)
 
         start = '2008-10-10T11:59:59Z'
         end = '2008-10-10T00:00:01Z'
-        for contrib in mysite.usercontribs(
-                userprefix='Timshiel',
-                start=pywikibot.Timestamp.fromISOformat(start),
-                end=pywikibot.Timestamp.fromISOformat(end),
-                total=5):
-            self.assertTrue(end <= contrib['timestamp'] <= start)
+        with self.subTest(start=start, end=end):
+            for contrib in mysite.usercontribs(
+                    userprefix='Timshiel',
+                    start=pywikibot.Timestamp.fromISOformat(start),
+                    end=pywikibot.Timestamp.fromISOformat(end),
+                    total=5):
+                self.assertTrue(end <= contrib['timestamp'] <= start)
 
     def test_user_prefix_reverse(self):
         """Test the site.usercontribs() method with range reversed."""

