1 files changed, 13 insertions, 0 deletions
diff --git a/tests/test_preview.py b/tests/test_preview.py
index cac3d81ac1..48e792b55b 100644
--- a/tests/test_preview.py
+++ b/tests/test_preview.py
@@ -325,6 +325,19 @@ class MediaEncodingTestCase(unittest.TestCase):
         )
         self.assertEqual(encoding, "ascii")
 
+    def test_meta_charset_underscores(self):
+        """A character encoding contains underscore."""
+        encoding = get_html_media_encoding(
+            b"""
+        <html>
+        <head><meta charset="Shift_JIS">
+        </head>
+        </html>
+        """,
+            "text/html",
+        )
+        self.assertEqual(encoding, "Shift_JIS")
+
     def test_xml_encoding(self):
         """A character encoding is found via the meta tag."""
         encoding = get_html_media_encoding(