[test_YoutubeDL] Add tests for #10591 (closes #23873)

test/test_YoutubeDL.py

@@ -816,12 +816,15 @@ class TestYoutubeDL(unittest.TestCase):
             'webpage_url': 'http://example.com',
         }
 
-        def get_ids(params):
+        def get_downloaded_info_dicts(params):
             ydl = YDL(params)
             # make a deep copy because the dictionary and nested entries
             # can be modified
             ydl.process_ie_result(copy.deepcopy(playlist))
-            return [int(v['id']) for v in ydl.downloaded_info_dicts]
+            return ydl.downloaded_info_dicts
+
+        def get_ids(params):
+            return [int(v['id']) for v in get_downloaded_info_dicts(params)]
 
         result = get_ids({})
         self.assertEqual(result, [1, 2, 3, 4])
@@ -853,6 +856,22 @@ class TestYoutubeDL(unittest.TestCase):
         result = get_ids({'playlist_items': '2-4,3-4,3'})
         self.assertEqual(result, [2, 3, 4])
 
+        # Tests for https://github.com/ytdl-org/youtube-dl/issues/10591
+        # @{
+        result = get_downloaded_info_dicts({'playlist_items': '2-4,3-4,3'})
+        self.assertEqual(result[0]['playlist_index'], 2)
+        self.assertEqual(result[1]['playlist_index'], 3)
+
+        result = get_downloaded_info_dicts({'playlist_items': '2-4,3-4,3'})
+        self.assertEqual(result[0]['playlist_index'], 2)
+        self.assertEqual(result[1]['playlist_index'], 3)
+        self.assertEqual(result[2]['playlist_index'], 4)
+
+        result = get_downloaded_info_dicts({'playlist_items': '4,2'})
+        self.assertEqual(result[0]['playlist_index'], 4)
+        self.assertEqual(result[1]['playlist_index'], 2)
+        # @}
+
     def test_urlopen_no_file_protocol(self):
         # see https://github.com/ytdl-org/youtube-dl/issues/8227
         ydl = YDL()