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# Copyright (c) Microsoft Corporation. All rights reserved.

from datetime import UTC, datetime

import pytest

from copilot import (

SessionHooks,

SubagentStartHookInput,

SubagentStartHookOutput,

SubagentStopHookInput,

SubagentStopHookOutput,

)

from copilot.session import CopilotSession

@pytest.mark.asyncio

async def test_subagent_start_dispatches_normalized_input_and_context():

captured: list[tuple[SubagentStartHookInput, dict[str, str]]] = []

async def on_start(

input_data: SubagentStartHookInput, invocation: dict[str, str]

) -> SubagentStartHookOutput:

captured.append((input_data, invocation))

return {"additionalContext": "Report the entire file"}

hooks: SessionHooks = {"on_subagent_start": on_start}

session = CopilotSession("parent", None)

session._register_hooks(hooks)

output = await session._handle_hooks_invoke(

"subagentStart",

{

"sessionId": "parent",

"timestamp": 1_700_000_000_000,

"cwd": "work",

"transcriptPath": "transcript.jsonl",

"agentName": "explore",

"agentDisplayName": "Explorer",

"agentDescription": "Reads files",

},

)

assert output == {"additionalContext": "Report the entire file"}

assert captured == [

(

{

"sessionId": "parent",

"timestamp": datetime.fromtimestamp(1_700_000_000, tz=UTC),

"workingDirectory": "work",

"transcriptPath": "transcript.jsonl",

"agentName": "explore",

"agentDisplayName": "Explorer",

"agentDescription": "Reads files",

},

{"session_id": "parent"},

)

]

@pytest.mark.asyncio

@pytest.mark.parametrize(

"hook_output",

[

{"decision": "block", "reason": "Read the rest of the file"},

{"modifiedResponse": "Verified: Hello from subagent test!"},

{"decision": "allow", "modifiedResponse": "Verified: Hello from subagent test!"},

],

)

async def test_subagent_stop_dispatches_normalized_input_and_verdict(

hook_output: SubagentStopHookOutput,

):

captured: list[tuple[SubagentStopHookInput, dict[str, str]]] = []

def on_stop(

input_data: SubagentStopHookInput, invocation: dict[str, str]

) -> SubagentStopHookOutput:

captured.append((input_data, invocation))

return hook_output

hooks: SessionHooks = {"on_subagent_stop": on_stop}

session = CopilotSession("parent", None)

session._register_hooks(hooks)

output = await session._handle_hooks_invoke(

"subagentStop",

{

"sessionId": "parent",

"timestamp": 1_700_000_000_000,

"cwd": "work",

"transcriptPath": "transcript.jsonl",

"agentName": "explore",

"agentType": "explore",

"stopReason": "end_turn",

"response": "Hello from subagent test!",

},

)

assert output == hook_output

assert captured == [

(

{

"sessionId": "parent",

"timestamp": datetime.fromtimestamp(1_700_000_000, tz=UTC),

"workingDirectory": "work",

"transcriptPath": "transcript.jsonl",

"agentName": "explore",

"agentType": "explore",

"stopReason": "end_turn",

"response": "Hello from subagent test!",

},

{"session_id": "parent"},

)

]

@pytest.mark.asyncio

async def test_subagent_stop_without_handler_returns_none():

session = CopilotSession("parent", None)

session._register_hooks({"on_subagent_start": lambda _input, _invocation: None})

assert await session._handle_hooks_invoke("subagentStop", {}) is None

@pytest.mark.asyncio

async def test_subagent_start_without_handler_returns_none():

session = CopilotSession("parent", None)

session._register_hooks({"on_subagent_stop": lambda _input, _invocation: None})

assert await session._handle_hooks_invoke("subagentStart", {}) is None