[cleanup] Misc cleanup

Closes #1942 #1976 #2020 #2058 #1984

test/test_YoutubeDL.py

@@ -780,8 +780,8 @@ class TestYoutubeDL(unittest.TestCase):
         test('%(title5)+#U', 'a\u0301e\u0301i\u0301 A')
         test('%(height)D', '1K')
         test('%(height)5.2D', ' 1.08K')
-        test('%(title4).10F', ('foo \'bar\' ', 'foo \'bar\'#'))
         test('%(title4)#F', 'foo_bar_test')
+        test('%(title4).10F', ('foo \'bar\' ', 'foo \'bar\'' + ('#' if compat_os_name == 'nt' else ' ')))
         if compat_os_name == 'nt':
             test('%(title4)q', ('"foo \\"bar\\" test"', "'foo _'bar_' test'"))
             test('%(formats.:.id)#q', ('"id 1" "id 2" "id 3"', "'id 1' 'id 2' 'id 3'"))

test/test_youtube_signature.py

@@ -82,6 +82,10 @@ _NSIG_TESTS = [
         'https://www.youtube.com/s/player/f1ca6900/player_ias.vflset/en_US/base.js',
         'cu3wyu6LQn2hse', 'jvxetvmlI9AN9Q',
     ),
+    (
+        'https://www.youtube.com/s/player/8040e515/player_ias.vflset/en_US/base.js',
+        'wvOFaY-yjgDuIEg5', 'HkfBFDHmgw4rsw',
+    ),
 ]