diff --git a/test/test_YoutubeDL.py b/test/test_YoutubeDL.py
index 3e6f7ec3f..49dc2c198 100644
--- a/test/test_YoutubeDL.py
+++ b/test/test_YoutubeDL.py
@@ -722,7 +722,7 @@ class TestYoutubeDL(unittest.TestCase):
         test('%(id)s', '-abcd', info={'id': '-abcd'})
         test('%(id)s', '.abcd', info={'id': '.abcd'})
         test('%(id)s', 'ab__cd', info={'id': 'ab__cd'})
-        test('%(id)s', ('ab:cd', 'ab -cd'), info={'id': 'ab:cd'})
+        test('%(id)s', ('ab:cd', 'ab：cd'), info={'id': 'ab:cd'})
         test('%(id.0)s', '-', info={'id': '--'})
 
         # Invalid templates
@@ -770,7 +770,7 @@ class TestYoutubeDL(unittest.TestCase):
         test('a%(width|)d', 'a', outtmpl_na_placeholder='none')
 
         FORMATS = self.outtmpl_info['formats']
-        sanitize = lambda x: x.replace(':', ' -').replace('"', "'").replace('\n', ' ')
+        sanitize = lambda x: x.replace(':', '：').replace('"', "＂").replace('\n', ' ')
 
         # Custom type casting
         test('%(formats.:.id)l', 'id 1, id 2, id 3')
@@ -788,13 +788,13 @@ class TestYoutubeDL(unittest.TestCase):
         test('%(filesize)#D', '1Ki')
         test('%(height)5.2D', ' 1.08k')
         test('%(title4)#S', 'foo_bar_test')
-        test('%(title4).10S', ('foo \'bar\' ', 'foo \'bar\'' + ('#' if compat_os_name == 'nt' else ' ')))
+        test('%(title4).10S', ('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('%(formats.0.id)#q', ('"id 1"', "'id 1'"))
+            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('%(formats.0.id)#q', ('"id 1"', '＂id 1＂'))
         else:
-            test('%(title4)q', ('\'foo "bar" test\'', "'foo 'bar' test'"))
+            test('%(title4)q', ('\'foo "bar" test\'', '\'foo ＂bar＂ test\''))
             test('%(formats.:.id)#q', "'id 1' 'id 2' 'id 3'")
             test('%(formats.0.id)#q', "'id 1'")
 
@@ -852,8 +852,8 @@ class TestYoutubeDL(unittest.TestCase):
         # Path expansion and escaping
         test('Hello %(title1)s', 'Hello $PATH')
         test('Hello %(title2)s', 'Hello %PATH%')
-        test('%(title3)s', ('foo/bar\\test', 'foo_bar_test'))
-        test('folder/%(title3)s', ('folder/foo/bar\\test', 'folder%sfoo_bar_test' % os.path.sep))
+        test('%(title3)s', ('foo/bar\\test', 'foo⧸bar⧹test'))
+        test('folder/%(title3)s', ('folder/foo/bar\\test', 'folder%sfoo⧸bar⧹test' % os.path.sep))
 
     def test_format_note(self):
         ydl = YoutubeDL()
diff --git a/test/test_utils.py b/test/test_utils.py
index 989a99ea3..659b071d3 100644
--- a/test/test_utils.py
+++ b/test/test_utils.py
@@ -140,13 +140,13 @@ class TestUtil(unittest.TestCase):
 
         self.assertEqual(sanitize_filename('123'), '123')
 
-        self.assertEqual('abc_de', sanitize_filename('abc/de'))
+        self.assertEqual('abc⧸de', sanitize_filename('abc/de'))
         self.assertFalse('/' in sanitize_filename('abc/de///'))
 
-        self.assertEqual('abc_de', sanitize_filename('abc/<>\\*|de'))
-        self.assertEqual('xxx', sanitize_filename('xxx/<>\\*|'))
-        self.assertEqual('yes no', sanitize_filename('yes? no'))
-        self.assertEqual('this - that', sanitize_filename('this: that'))
+        self.assertEqual('abc_de', sanitize_filename('abc/<>\\*|de', is_id=False))
+        self.assertEqual('xxx', sanitize_filename('xxx/<>\\*|', is_id=False))
+        self.assertEqual('yes no', sanitize_filename('yes? no', is_id=False))
+        self.assertEqual('this - that', sanitize_filename('this: that', is_id=False))
 
         self.assertEqual(sanitize_filename('AT&T'), 'AT&T')
         aumlaut = 'ä'