diff --git a/yt_dlp/extractor/generic.py b/yt_dlp/extractor/generic.py
index 0b5787464..dce65f02a 100644
--- a/yt_dlp/extractor/generic.py
+++ b/yt_dlp/extractor/generic.py
@@ -1364,32 +1364,6 @@ class GenericIE(InfoExtractor):
             'title': 'Official Trailer | TROLLS: THE BEAT GOES ON!',
         },
         'skip': 'Invalid URL',
-    }, {
-        # ✅101
-        # SubstackIE
-        'url': 'https://www.mollymovieclub.com/p/interstellar',
-        'info_dict': {
-            'id': '53602801',
-            'ext': 'mpga',
-            'title': 'Interstellar',
-            'description': 'md5:6f6a458df735853f40fb3892156e4144',
-            'thumbnail': r're:https?://.+\.jpeg',
-            'uploader': 'Molly Movie Club',
-            'uploader_id': '839621',
-        },
-    }, {
-        # ✅102
-        # SubstackIE
-        'url': 'https://www.blockedandreported.org/p/episode-117-lets-talk-about-depp',
-        'info_dict': {
-            'id': '57962052',
-            'ext': 'mpga',
-            'title': 'md5:855b2756f0ee10f6723fa00b16266f8d',
-            'description': 'md5:fe512a5e94136ad260c80bde00ea4eef',
-            'thumbnail': r're:https?://.+\.jpeg',
-            'uploader': 'Blocked and Reported',
-            'uploader_id': '500230',
-        },
     }, {
         # ✅124
         # YoutubeIE
diff --git a/yt_dlp/extractor/substack.py b/yt_dlp/extractor/substack.py
index b70d40f2c..a571bb788 100644
--- a/yt_dlp/extractor/substack.py
+++ b/yt_dlp/extractor/substack.py
@@ -63,6 +63,29 @@ class SubstackIE(InfoExtractor):
             'uploader_id': '61579',
         },
     }]
+    _WEBPAGE_TESTS = [{
+        'url': 'https://www.mollymovieclub.com/p/interstellar',
+        'info_dict': {
+            'id': '53602801',
+            'ext': 'mpga',
+            'title': 'Interstellar',
+            'description': 'md5:6f6a458df735853f40fb3892156e4144',
+            'thumbnail': r're:https?://.+\.jpeg',
+            'uploader': 'Molly Movie Club',
+            'uploader_id': '839621',
+        },
+    }, {
+        'url': 'https://www.blockedandreported.org/p/episode-117-lets-talk-about-depp',
+        'info_dict': {
+            'id': '57962052',
+            'ext': 'mpga',
+            'title': 'md5:855b2756f0ee10f6723fa00b16266f8d',
+            'description': 'md5:fe512a5e94136ad260c80bde00ea4eef',
+            'thumbnail': r're:https?://.+\.jpeg',
+            'uploader': 'Blocked and Reported',
+            'uploader_id': '500230',
+        },
+    }]
 
     @classmethod
     def _extract_embed_urls(cls, url, webpage):