From 449b9f9aeeaa3a1529d2c29a9a43e87350177559 Mon Sep 17 00:00:00 2001
From: Clifford Gama <cliffygamy@gmail.com>
Date: Fri, 18 Apr 2025 19:55:59 +0200
Subject: Fixed #35728 -- Computed error messages in assertions only on test
 failures.

Performance regression in 1dae65dc63ae84be5002c37b4ddae0b9220e8808.

Thanks to Adam Johnson for the report.
---
 tests/test_utils/tests.py | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'tests/test_utils')

diff --git a/tests/test_utils/tests.py b/tests/test_utils/tests.py
index 494a0ea8d3..37e87aa102 100644
--- a/tests/test_utils/tests.py
+++ b/tests/test_utils/tests.py
@@ -1083,6 +1083,15 @@ class InHTMLTests(SimpleTestCase):
         with self.assertRaisesMessage(AssertionError, msg):
             self.assertNotInHTML("<b>Hello</b>", haystack=haystack)
 
+    def test_assert_not_in_html_msg_prefix(self):
+        haystack = "<p>Hello</p>"
+        msg = (
+            "1 != 0 : Prefix: '<p>Hello</p>' unexpectedly found in the following "
+            f"response\n{haystack!r}"
+        )
+        with self.assertRaisesMessage(AssertionError, msg):
+            self.assertNotInHTML("<p>Hello</p>", haystack=haystack, msg_prefix="Prefix")
+
 
 class JSONEqualTests(SimpleTestCase):
     def test_simple_equal(self):
-- 
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