add test

Author: xuantengh

Lib/test/test_monitoring.py

@@ -1709,6 +1709,24 @@ def func(v=1):
             ('branch right', 'func', 6, 8),
             ('branch right', 'func', 2, 10)])
 
+    def test_callback_set_frame_lineno(self):
+        def func(s: str) -> int:
+            if s.startswith("t"):
+                return 1
+            else:
+                return 0
+
+        def callback(code, from_, to):
+            frame = sys._getframe(0)
+            old = frame.f_lineno
+            # try set frame.f_lineno
+            frame.f_lineno = frame.f_lineno
+
+        sys.monitoring.set_local_events(TEST_TOOL, func.__code__, E.BRANCH_LEFT)
+        sys.monitoring.register_callback(TEST_TOOL, E.BRANCH_LEFT, callback)
+
+        self.assertEqual(func("true"), 1)
+
 
 class TestBranchConsistency(MonitoringTestBase, unittest.TestCase):