chore: import upstream snapshot with attribution

tests/test_agent_memory_leak.py

@@ -0,0 +1,35 @@
+from __future__ import annotations
+
+import gc
+import weakref
+
+import pytest
+from openai.types.responses import ResponseOutputMessage, ResponseOutputText
+
+from agents import Agent, Runner
+from tests.fake_model import FakeModel
+
+
+def _make_message(text: str) -> ResponseOutputMessage:
+    return ResponseOutputMessage(
+        id="msg-1",
+        content=[ResponseOutputText(annotations=[], text=text, type="output_text")],
+        role="assistant",
+        status="completed",
+        type="message",
+    )
+
+
+@pytest.mark.asyncio
+async def test_agent_is_released_after_run() -> None:
+    fake_model = FakeModel(initial_output=[_make_message("Paris")])
+    agent = Agent(name="leak-test-agent", instructions="Answer questions.", model=fake_model)
+    agent_ref = weakref.ref(agent)
+
+    # Running the agent should not leave behind strong references once the result goes out of scope.
+    await Runner.run(agent, "What is the capital of France?")
+
+    del agent
+    gc.collect()
+
+    assert agent_ref() is None