gh-48330: assert warning is emitted on unittest.TestResult with no addDuration (...

diff --git a/Lib/test/test_unittest/test_case.py b/Lib/test/test_unittest/test_case.py
index 05d60a8ad3cf948965306a7c8470a47a18052ab3..dd5ff6d553e61deb441e8e3aff63258da0c4cb86 100644 (file)
--- a/Lib/test/test_unittest/test_case.py
+++ b/Lib/test/test_unittest/test_case.py
@@ -304,7 +304,8 @@ class Test_TestCase(unittest.TestCase, TestEquality, TestHashing):
             def test(self):
                 pass
 
-        Foo('test').run()
+        with self.assertWarns(RuntimeWarning):
+            Foo('test').run()
 
     def test_deprecation_of_return_val_from_test(self):
         # Issue 41322 - deprecate return of value that is not None from a test