1 files changed, 10 insertions, 0 deletions
diff --git a/tests/test_utils/tests.py b/tests/test_utils/tests.py
index bce060f7ef..ce78ffc008 100644
--- a/tests/test_utils/tests.py
+++ b/tests/test_utils/tests.py
@@ -1053,6 +1053,16 @@ class InHTMLTests(SimpleTestCase):
         with self.assertRaisesMessage(AssertionError, msg):
             self.assertInHTML("<b>This</b>", haystack, 3)
 
+    def test_assert_not_in_html(self):
+        haystack = "<p><b>Hello</b> <span>there</span>! Hi <span>there</span>!</p>"
+        self.assertNotInHTML("<b>Hi</b>", haystack=haystack)
+        msg = (
+            "'<b>Hello</b>' unexpectedly found in the following response"
+            f"\n{haystack!r}"
+        )
+        with self.assertRaisesMessage(AssertionError, msg):
+            self.assertNotInHTML("<b>Hello</b>", haystack=haystack)
+
 
 class JSONEqualTests(SimpleTestCase):
     def test_simple_equal(self):