diff --git a/tests/test_3141596.py b/tests/test_3141596.py
index 3ab366a6..1cea92e8 100644
--- a/tests/test_3141596.py
+++ b/tests/test_3141596.py
@@ -97,8 +97,10 @@ def real_wrapper(self):
 class UnitTestingTestCase(DeferrableTestCase):
 
     def assertRegexContains(self, txt, expr, msg=None):
-        m = re.search(expr, txt, re.MULTILINE)
-        self.assertIsNotNone(m, msg)
+        if re.search(expr, txt, re.MULTILINE) is None:
+            self.fail("String {!r} does not contain regexp {!r}.".format(
+                txt, expr
+            ))
 
     def assertOk(self, txt, msg=None):
         self.assertRegexContains(txt, r'^OK', msg)