Fix test case and add explanation in comment

pR0Ps · pR0Ps · commit 5e7f10bf90e3 · 2023-12-24T15:37:31.000-05:00
diff --git a/Lib/test/test_sys.py b/Lib/test/test_sys.py
@@ -244,8 +244,16 @@ def outer():
                 self.assertIsInstance(sys.exception(), ValueError)
                 self.assertIsInstance(sys.exception().__context__, TypeError)
                 yield next(g)
+                # at this point the TypeError from the caller has been handled
+                # by the caller's except block. Even still, it should still by
+                # referenced as the __context__ of the current exception.
                 self.assertIsInstance(sys.exception(), ValueError)
-            self.assertIsInstance(sys.exception(), TypeError)
+                self.assertIsInstance(sys.exception().__context__, TypeError)
+            # not handling an exception, caller isn't anymore either
+            self.assertIsNone(sys.exception())
+            with self.assertRaises(StopIteration):
+                next(g)
+            self.assertIsNone(sys.exception())
 
         g = outer()
         next(g)
