Add test case

Author: hyongtao-code

Lib/test/test_profiling/test_sampling_profiler/test_integration.py

@@ -953,3 +953,42 @@ def test_all_stacks_share_same_base_frame(self):
             f"missing the entry point function 'run_forever'. This indicates "
             f"incomplete stacks are being returned, likely due to frame cache "
             f"storing partial stack traces.")
+
+
+@requires_remote_subprocess_debugging()
+class TestSampleProfilerUnwinderArgs(unittest.TestCase):
+
+    def test_only_active_thread_mapping_matches_all_threads(self):
+        calls = []
+
+        def fake_remote_unwinder(pid, **kwargs):
+            calls.append((pid, kwargs))
+            return object()
+
+        with (
+            mock.patch(
+                "profiling.sampling.sample._remote_debugging.RemoteUnwinder",
+                side_effect=fake_remote_unwinder,
+            ),
+            # Force the non-free-threaded code path regardless of build flavor.
+            mock.patch("profiling.sampling.sample._FREE_THREADED_BUILD", False),
+        ):
+            SampleProfiler(pid=123, sample_interval_usec=1000, all_threads=False)
+            SampleProfiler(pid=123, sample_interval_usec=1000, all_threads=True)
+
+        self.assertEqual(len(calls), 2)
+
+        _, kwargs0 = calls[0]
+        _, kwargs1 = calls[1]
+
+        self.assertIn("only_active_thread", kwargs0)
+        self.assertIn("only_active_thread", kwargs1)
+
+        self.assertTrue(
+            kwargs0["only_active_thread"],
+            "Expected only_active_thread=True when all_threads=False",
+        )
+        self.assertFalse(
+            kwargs1["only_active_thread"],
+            "Expected only_active_thread=False when all_threads=True",
+        )