chore: import upstream snapshot with attribution

tests/test_agent_llm_hooks.py

@@ -0,0 +1,130 @@
+from collections import defaultdict
+from typing import Any
+
+import pytest
+
+from agents.agent import Agent
+from agents.items import ItemHelpers, ModelResponse, TResponseInputItem
+from agents.lifecycle import AgentHooks
+from agents.run import Runner
+from agents.run_context import AgentHookContext, RunContextWrapper, TContext
+from agents.tool import Tool
+
+from .fake_model import FakeModel
+from .test_responses import (
+    get_function_tool,
+    get_text_message,
+)
+
+
+class AgentHooksForTests(AgentHooks):
+    def __init__(self):
+        self.events: dict[str, int] = defaultdict(int)
+
+    def reset(self):
+        self.events.clear()
+
+    async def on_start(self, context: AgentHookContext[TContext], agent: Agent[TContext]) -> None:
+        self.events["on_start"] += 1
+
+    async def on_end(
+        self, context: RunContextWrapper[TContext], agent: Agent[TContext], output: Any
+    ) -> None:
+        self.events["on_end"] += 1
+
+    async def on_handoff(
+        self, context: RunContextWrapper[TContext], agent: Agent[TContext], source: Agent[TContext]
+    ) -> None:
+        self.events["on_handoff"] += 1
+
+    async def on_tool_start(
+        self, context: RunContextWrapper[TContext], agent: Agent[TContext], tool: Tool
+    ) -> None:
+        self.events["on_tool_start"] += 1
+
+    async def on_tool_end(
+        self,
+        context: RunContextWrapper[TContext],
+        agent: Agent[TContext],
+        tool: Tool,
+        result: object,
+    ) -> None:
+        self.events["on_tool_end"] += 1
+
+    # NEW: LLM hooks
+    async def on_llm_start(
+        self,
+        context: RunContextWrapper[TContext],
+        agent: Agent[TContext],
+        system_prompt: str | None,
+        input_items: list[TResponseInputItem],
+    ) -> None:
+        self.events["on_llm_start"] += 1
+
+    async def on_llm_end(
+        self,
+        context: RunContextWrapper[TContext],
+        agent: Agent[TContext],
+        response: ModelResponse,
+    ) -> None:
+        self.events["on_llm_end"] += 1
+
+
+# Example test using the above hooks:
+@pytest.mark.asyncio
+async def test_async_agent_hooks_with_llm():
+    hooks = AgentHooksForTests()
+    model = FakeModel()
+    agent = Agent(
+        name="A", model=model, tools=[get_function_tool("f", "res")], handoffs=[], hooks=hooks
+    )
+    # Simulate a single LLM call producing an output:
+    model.set_next_output([get_text_message("hello")])
+    await Runner.run(agent, input="hello")
+    # Expect one on_start, one on_llm_start, one on_llm_end, and one on_end
+    assert hooks.events == {"on_start": 1, "on_llm_start": 1, "on_llm_end": 1, "on_end": 1}
+
+
+# test_sync_agent_hook_with_llm()
+def test_sync_agent_hook_with_llm():
+    hooks = AgentHooksForTests()
+    model = FakeModel()
+    agent = Agent(
+        name="A", model=model, tools=[get_function_tool("f", "res")], handoffs=[], hooks=hooks
+    )
+    # Simulate a single LLM call producing an output:
+    model.set_next_output([get_text_message("hello")])
+    Runner.run_sync(agent, input="hello")
+    # Expect one on_start, one on_llm_start, one on_llm_end, and one on_end
+    assert hooks.events == {"on_start": 1, "on_llm_start": 1, "on_llm_end": 1, "on_end": 1}
+
+
+# test_streamed_agent_hooks_with_llm():
+@pytest.mark.asyncio
+async def test_streamed_agent_hooks_with_llm():
+    hooks = AgentHooksForTests()
+    model = FakeModel()
+    agent = Agent(
+        name="A", model=model, tools=[get_function_tool("f", "res")], handoffs=[], hooks=hooks
+    )
+    # Simulate a single LLM call producing an output:
+    model.set_next_output([get_text_message("hello")])
+    stream = Runner.run_streamed(agent, input="hello")
+
+    async for event in stream.stream_events():
+        if event.type == "raw_response_event":
+            continue
+        if event.type == "agent_updated_stream_event":
+            print(f"[EVENT] agent_updated → {event.new_agent.name}")
+        elif event.type == "run_item_stream_event":
+            item = event.item
+            if item.type == "tool_call_item":
+                print("[EVENT] tool_call_item")
+            elif item.type == "tool_call_output_item":
+                print(f"[EVENT] tool_call_output_item → {item.output}")
+            elif item.type == "message_output_item":
+                text = ItemHelpers.text_message_output(item)
+                print(f"[EVENT] message_output_item → {text}")
+
+    # Expect one on_start, one on_llm_start, one on_llm_end, and one on_end
+    assert hooks.events == {"on_start": 1, "on_llm_start": 1, "on_llm_end": 1, "on_end": 1}