diff --git a/frappe/tests/test_utils.py b/frappe/tests/test_utils.py
index e903c655b0..e68e8372af 100644
--- a/frappe/tests/test_utils.py
+++ b/frappe/tests/test_utils.py
@@ -254,6 +254,13 @@ class TestHTMLUtils(unittest.TestCase):
 		self.assertTrue("<h1>Hello</h1>" in clean)
 		self.assertTrue('<a href="http://test.com">text</a>' in clean)
 
+	def test_sanitize_html(self):
+		from frappe.utils.html_utils import sanitize_html
+
+		clean = sanitize_html("<ol data-list='ordered' unknown_attr='xyz'></ol>")
+		self.assertIn("ordered", clean)
+		self.assertNotIn("xyz", clean)
+
 
 class TestValidationUtils(unittest.TestCase):
 	def test_valid_url(self):