diff --git a/gallery_dl/extractor/imgur.py b/gallery_dl/extractor/imgur.py
index be7fce8c..13622917 100644
--- a/gallery_dl/extractor/imgur.py
+++ b/gallery_dl/extractor/imgur.py
@@ -89,6 +89,9 @@ class ImgurImageExtractor(ImgurExtractor):
             "url": "a2220eb265a55b0c95e0d3d721ec7665460e3fd7",
             "content": "a3c080e43f58f55243ab830569ba02309d59abfc",
         }),
+        ("https://imgur.com/HjoXJAd", {  # url ends with '.jpg?1'
+            "url": "73f361b50753ab25da64160aa50bc5d139480d45",
+        }),
         ("https://imgur.com/zzzzzzz", {
             "exception": exception.NotFoundError,
         }),
diff --git a/gallery_dl/extractor/mangastream.py b/gallery_dl/extractor/mangastream.py
index b9708594..6f21dc3b 100644
--- a/gallery_dl/extractor/mangastream.py
+++ b/gallery_dl/extractor/mangastream.py
@@ -18,6 +18,7 @@ class MangastreamChapterExtractor(ChapterExtractor):
     category = "mangastream"
     pattern = [(r"(?:https?://)?(?:www\.)?(?:readms|mangastream)\.(?:com|net)/"
                 r"r(?:ead)?/([^/]*/([^/]+)/(\d+))")]
+    test = [("https://readms.net/r/onepunch_man/087/4874/1", None)]
     base_url = "https://readms.net/r/"
 
     def __init__(self, match):
diff --git a/gallery_dl/extractor/reddit.py b/gallery_dl/extractor/reddit.py
index 89a7e834..ce175d1f 100644
--- a/gallery_dl/extractor/reddit.py
+++ b/gallery_dl/extractor/reddit.py
@@ -75,6 +75,10 @@ class RedditSubredditExtractor(RedditExtractor):
     pattern = [r"(?:https?://)?(?:m\.|www\.)?reddit\.com/r/([^/?&#]+)"
                r"(/[a-z]+)?/?"
                r"(?:\?.*?(?:\bt=([a-z]+))?)?$"]
+    test = [
+        ("https://www.reddit.com/r/lavaporn/", None),
+        ("https://www.reddit.com/r/lavaporn/top/?sort=top&t=month", None),
+    ]
 
     def __init__(self, match):
         RedditExtractor.__init__(self)
@@ -93,6 +97,14 @@ class RedditSubmissionExtractor(RedditExtractor):
                 r"(?:m\.|www\.)?reddit\.com/r/[^/]+/comments|"
                 r"redd\.it"
                 r")/([a-z0-9]+)")]
+    test = [
+        ("https://www.reddit.com/r/lavaporn/comments/2a00np/", {
+            "pattern": r"https?://i\.imgur\.com/AaAUCgy\.jpg",
+            "count": 1,
+        }),
+        ("https://m.reddit.com/r/lavaporn/comments/2a00np/", None),
+        ("https://redd.it/2a00np/", None),
+    ]
 
     def __init__(self, match):
         RedditExtractor.__init__(self)