[utils] Add a function to sanitize consecutive slashes in URLs

test/test_utils.py

@@ -54,6 +54,7 @@ from youtube_dl.utils import (
     xpath_with_ns,
     render_table,
     match_str,
+    url_sanitize_consecutive_slashes,
 )
 
 
@@ -501,6 +502,21 @@ ffmpeg version 2.4.4 Copyright (c) 2000-2014 the FFmpeg ...'''), '2.4.4')
             'like_count > 100 & dislike_count <? 50 & description',
             {'like_count': 190, 'dislike_count': 10}))
 
+    def test_url_sanitize_consecutive_slashes(self):
+        self.assertEqual(url_sanitize_consecutive_slashes(
+            'http://hostname/foo//bar/filename.html'),
+            'http://hostname/foo/bar/filename.html')
+        self.assertEqual(url_sanitize_consecutive_slashes(
+            'http://hostname//foo/bar/filename.html'),
+            'http://hostname/foo/bar/filename.html')
+        self.assertEqual(url_sanitize_consecutive_slashes(
+            'http://hostname//'), 'http://hostname/')
+        self.assertEqual(url_sanitize_consecutive_slashes(
+            'http://hostname/foo/bar/filename.html'),
+            'http://hostname/foo/bar/filename.html')
+        self.assertEqual(url_sanitize_consecutive_slashes(
+            'http://hostname/'), 'http://hostname/')
+
 
 if __name__ == '__main__':
     unittest.main()