fix extractor docstrings

gallery_dl/extractor/artstation.py

@@ -137,7 +137,7 @@ class ArtstationUserExtractor(ArtstationExtractor):
 
 
 class ArtstationAlbumExtractor(ArtstationExtractor):
-    """Extractor for all projects of an artstation user"""
+    """Extractor for all projects in an artstation album"""
     subcategory = "album"
     directory_fmt = ["{category}", "{userinfo[username]}", "Albums",
                      "{album[id]} - {album[title]}"]

gallery_dl/extractor/tumblr.py

@@ -234,7 +234,7 @@ class TumblrTagExtractor(TumblrExtractor):
 
 
 class TumblrLikesExtractor(TumblrExtractor):
-    """Extractor for images from a tumblr-user by tag"""
+    """Extractor for images from a tumblr-user's liked posts"""
     subcategory = "likes"
     directory_fmt = ["{category}", "{name}", "likes"]
     archive_fmt = "f_{blog[name]}_{id}_{offset}"

test/test_extractor.py

@@ -133,6 +133,17 @@ class TestExtractor(unittest.TestCase):
                 msg = "'{}' isn't matched by any pattern".format(url)
                 self.fail(msg)
 
+    def test_docstrings(self):
+        """ensure docstring uniqueness"""
+        for extr1 in extractor.extractors():
+            for extr2 in extractor.extractors():
+                if extr1 != extr2 and extr1.__doc__ and extr2.__doc__:
+                    self.assertNotEqual(
+                        extr1.__doc__,
+                        extr2.__doc__,
+                        "{} <-> {}".format(extr1, extr2),
+                    )
+
 
 if __name__ == "__main__":
     unittest.main()