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import json
from unittest.mock import AsyncMock, MagicMock, patch
from collections.abc import AsyncGenerator
import httpx
import pytest
from a2a.client import (
A2ACardResolver,
A2AClient,
A2AClientHTTPError,
A2AClientJSONError,
create_text_message_object,
)
from a2a.types import (
AgentCard,
AgentSkill,
AgentCapabilities,
AgentAuthentication,
A2ARequest,
Role,
TaskQueryParams,
TaskIdParams,
GetTaskRequest,
GetTaskResponse,
SendMessageRequest,
MessageSendParams,
SendMessageResponse,
SendMessageSuccessResponse,
JSONRPCErrorResponse,
InvalidParamsError,
CancelTaskRequest,
CancelTaskResponse,
CancelTaskSuccessResponse,
SendStreamingMessageRequest,
SendStreamingMessageResponse,
TaskNotCancelableError,
)
from typing import Any
from httpx_sse import ServerSentEvent, EventSource
AGENT_CARD = AgentCard(
name='Hello World Agent',
description='Just a hello world agent',
url='http://localhost:9999/',
version='1.0.0',
defaultInputModes=['text'],
defaultOutputModes=['text'],
capabilities=AgentCapabilities(),
skills=[
AgentSkill(
id='hello_world',
name='Returns hello world',
description='just returns hello world',
tags=['hello world'],
examples=['hi', 'hello world'],
)
],
authentication=AgentAuthentication(schemes=['public']),
)
MINIMAL_TASK: dict[str, Any] = {
'id': 'task-abc',
'contextId': 'session-xyz',
'status': {'state': 'working'},
'type': 'task',
}
MINIMAL_CANCELLED_TASK: dict[str, Any] = {
'id': 'task-abc',
'contextId': 'session-xyz',
'status': {'state': 'canceled'},
'type': 'task',
}
@pytest.fixture
def mock_httpx_client() -> AsyncMock:
return AsyncMock(spec=httpx.AsyncClient)
@pytest.fixture
def mock_agent_card() -> MagicMock:
return MagicMock(spec=AgentCard, url='http://agent.example.com/api')
async def async_iterable_from_list(
items: list[ServerSentEvent],
) -> AsyncGenerator[ServerSentEvent, None]:
"""Helper to create an async iterable from a list."""
for item in items:
yield item
class TestA2ACardResolver:
BASE_URL = 'http://example.com'
AGENT_CARD_PATH = '/.well-known/agent.json'
FULL_AGENT_CARD_URL = f'{BASE_URL}{AGENT_CARD_PATH}'
@pytest.mark.asyncio
async def test_init_strips_slashes(self, mock_httpx_client: AsyncMock):
resolver = A2ACardResolver(
httpx_client=mock_httpx_client,
base_url='http://example.com/',
agent_card_path='/.well-known/agent.json/',
)
assert resolver.base_url == 'http://example.com'
assert (
resolver.agent_card_path == '.well-known/agent.json/'
) # Path is only lstrip'd
resolver_no_leading_slash_path = A2ACardResolver(
httpx_client=AsyncMock(),
base_url='http://example.com',
agent_card_path='.well-known/agent.json',
)
assert resolver_no_leading_slash_path.base_url == 'http://example.com'
assert (
resolver_no_leading_slash_path.agent_card_path
== '.well-known/agent.json'
)
@pytest.mark.asyncio
async def test_get_agent_card_success(self, mock_httpx_client: AsyncMock):
mock_response = AsyncMock(spec=httpx.Response)
mock_response.status_code = 200
mock_response.json.return_value = AGENT_CARD.model_dump()
mock_httpx_client.get.return_value = mock_response
resolver = A2ACardResolver(
httpx_client=mock_httpx_client,
base_url=self.BASE_URL,
agent_card_path=self.AGENT_CARD_PATH,
)
agent_card = await resolver.get_agent_card(http_kwargs={'timeout': 10})
mock_httpx_client.get.assert_called_once_with(
self.FULL_AGENT_CARD_URL, timeout=10
)
mock_response.raise_for_status.assert_called_once()
assert isinstance(agent_card, AgentCard)
assert agent_card == AGENT_CARD
@pytest.mark.asyncio
async def test_get_agent_card_http_status_error(
self, mock_httpx_client: AsyncMock
):
mock_response = MagicMock(
spec=httpx.Response
) # Use MagicMock for response attribute
mock_response.status_code = 404
mock_response.text = 'Not Found'
http_status_error = httpx.HTTPStatusError(
'Not Found', request=MagicMock(), response=mock_response
)
mock_httpx_client.get.side_effect = http_status_error
resolver = A2ACardResolver(
httpx_client=mock_httpx_client,
base_url=self.BASE_URL,
agent_card_path=self.AGENT_CARD_PATH,
)
with pytest.raises(A2AClientHTTPError) as exc_info:
await resolver.get_agent_card()
assert exc_info.value.status_code == 404
assert 'HTTP Error 404: Not Found' in str(exc_info.value)
mock_httpx_client.get.assert_called_once_with(self.FULL_AGENT_CARD_URL)
@pytest.mark.asyncio
async def test_get_agent_card_json_decode_error(
self, mock_httpx_client: AsyncMock
):
mock_response = AsyncMock(spec=httpx.Response)
mock_response.status_code = 200
json_error = json.JSONDecodeError('Expecting value', 'doc', 0)
mock_response.json.side_effect = json_error
mock_httpx_client.get.return_value = mock_response
resolver = A2ACardResolver(
httpx_client=mock_httpx_client,
base_url=self.BASE_URL,
agent_card_path=self.AGENT_CARD_PATH,
)
with pytest.raises(A2AClientJSONError) as exc_info:
await resolver.get_agent_card()
assert 'JSON Error: Expecting value' in str(exc_info.value)
mock_httpx_client.get.assert_called_once_with(self.FULL_AGENT_CARD_URL)
@pytest.mark.asyncio
async def test_get_agent_card_request_error(
self, mock_httpx_client: AsyncMock
):
request_error = httpx.RequestError('Network issue', request=MagicMock())
mock_httpx_client.get.side_effect = request_error
resolver = A2ACardResolver(
httpx_client=mock_httpx_client,
base_url=self.BASE_URL,
agent_card_path=self.AGENT_CARD_PATH,
)
with pytest.raises(A2AClientHTTPError) as exc_info:
await resolver.get_agent_card()
assert exc_info.value.status_code == 503
assert 'Network communication error: Network issue' in str(
exc_info.value
)
mock_httpx_client.get.assert_called_once_with(self.FULL_AGENT_CARD_URL)
class TestA2AClient:
AGENT_URL = 'http://agent.example.com/api'
def test_init_with_agent_card(
self, mock_httpx_client: AsyncMock, mock_agent_card: MagicMock
):
client = A2AClient(
httpx_client=mock_httpx_client, agent_card=mock_agent_card
)
assert client.url == mock_agent_card.url
assert client.httpx_client == mock_httpx_client
def test_init_with_url(self, mock_httpx_client: AsyncMock):
client = A2AClient(httpx_client=mock_httpx_client, url=self.AGENT_URL)
assert client.url == self.AGENT_URL
assert client.httpx_client == mock_httpx_client
def test_init_with_agent_card_and_url_prioritizes_agent_card(
self, mock_httpx_client: AsyncMock, mock_agent_card: MagicMock
):
client = A2AClient(
httpx_client=mock_httpx_client,
agent_card=mock_agent_card,
url='http://otherurl.com',
)
assert (
client.url == mock_agent_card.url
) # Agent card URL should be used
def test_init_raises_value_error_if_no_card_or_url(
self, mock_httpx_client: AsyncMock
):
with pytest.raises(ValueError) as exc_info:
A2AClient(httpx_client=mock_httpx_client)
assert 'Must provide either agent_card or url' in str(exc_info.value)
@pytest.mark.asyncio
async def test_get_client_from_agent_card_url_success(
self, mock_httpx_client: AsyncMock, mock_agent_card: MagicMock
):
base_url = 'http://example.com'
agent_card_path = '/.well-known/custom-agent.json'
resolver_kwargs = {'timeout': 30}
mock_resolver_instance = AsyncMock(spec=A2ACardResolver)
mock_resolver_instance.get_agent_card.return_value = mock_agent_card
with patch(
'a2a.client.client.A2ACardResolver',
return_value=mock_resolver_instance,
) as mock_resolver_class:
client = await A2AClient.get_client_from_agent_card_url(
httpx_client=mock_httpx_client,
base_url=base_url,
agent_card_path=agent_card_path,
http_kwargs=resolver_kwargs,
)
mock_resolver_class.assert_called_once_with(
mock_httpx_client,
base_url=base_url,
agent_card_path=agent_card_path,
)
mock_resolver_instance.get_agent_card.assert_called_once_with(
http_kwargs=resolver_kwargs
)
assert isinstance(client, A2AClient)
assert client.url == mock_agent_card.url
assert client.httpx_client == mock_httpx_client
@pytest.mark.asyncio
async def test_get_client_from_agent_card_url_resolver_error(
self, mock_httpx_client: AsyncMock
):
error_to_raise = A2AClientHTTPError(404, 'Agent card not found')
with patch(
'a2a.client.client.A2ACardResolver.get_agent_card',
new_callable=AsyncMock,
side_effect=error_to_raise,
):
with pytest.raises(A2AClientHTTPError) as exc_info:
await A2AClient.get_client_from_agent_card_url(
httpx_client=mock_httpx_client,
base_url='http://example.com',
)
assert exc_info.value == error_to_raise
@pytest.mark.asyncio
async def test_send_message_success_use_request(
self, mock_httpx_client: AsyncMock, mock_agent_card: MagicMock
):
client = A2AClient(
httpx_client=mock_httpx_client, agent_card=mock_agent_card
)
params = MessageSendParams(
message=create_text_message_object(content='Hello')
)
request = SendMessageRequest(id=123, params=params)
success_response = create_text_message_object(
role=Role.agent, content='Hi there!'
).model_dump(exclude_none=True)
rpc_response: dict[str, Any] = {
'id': 123,
'jsonrpc': '2.0',
'result': success_response,
}
with patch.object(
client, '_send_request', new_callable=AsyncMock
) as mock_send_req:
mock_send_req.return_value = rpc_response
response = await client.send_message(
request=request, http_kwargs={'timeout': 10}
)
assert mock_send_req.call_count == 1
called_args, called_kwargs = mock_send_req.call_args
assert not called_kwargs # no kwargs to _send_request
assert len(called_args) == 2
json_rpc_request: dict[str, Any] = called_args[0]
assert isinstance(json_rpc_request['id'], int)
http_kwargs: dict[str, Any] = called_args[1]
assert http_kwargs['timeout'] == 10
a2a_request_arg = A2ARequest.model_validate(json_rpc_request)
assert isinstance(a2a_request_arg.root, SendMessageRequest)
assert isinstance(a2a_request_arg.root.params, MessageSendParams)
assert a2a_request_arg.root.params.model_dump(
exclude_none=True
) == params.model_dump(exclude_none=True)
assert isinstance(response, SendMessageResponse)
assert isinstance(response.root, SendMessageSuccessResponse)
assert (
response.root.result.model_dump(exclude_none=True)
== success_response
)
@pytest.mark.asyncio
async def test_send_message_error_response(
self, mock_httpx_client: AsyncMock, mock_agent_card: MagicMock
):
client = A2AClient(
httpx_client=mock_httpx_client, agent_card=mock_agent_card
)
params = MessageSendParams(
message=create_text_message_object(content='Hello')
)
request = SendMessageRequest(id=123, params=params)
error_response = InvalidParamsError()
rpc_response: dict[str, Any] = {
'id': 123,
'jsonrpc': '2.0',
'error': error_response.model_dump(exclude_none=True),
}
with patch.object(
client, '_send_request', new_callable=AsyncMock
) as mock_send_req:
mock_send_req.return_value = rpc_response
response = await client.send_message(request=request)
assert isinstance(response, SendMessageResponse)
assert isinstance(response.root, JSONRPCErrorResponse)
assert response.root.error.model_dump(
exclude_none=True
) == InvalidParamsError().model_dump(exclude_none=True)
@pytest.mark.asyncio
@patch('a2a.client.client.aconnect_sse')
async def test_send_message_streaming_success_request(
self,
mock_aconnect_sse: AsyncMock,
mock_httpx_client: AsyncMock,
mock_agent_card: MagicMock,
):
client = A2AClient(
httpx_client=mock_httpx_client, agent_card=mock_agent_card
)
params = MessageSendParams(
message=create_text_message_object(content='Hello stream')
)
request = SendStreamingMessageRequest(id=123, params=params)
mock_stream_response_1_dict: dict[str, Any] = {
'id': 'stream_id_123',
'jsonrpc': '2.0',
'result': create_text_message_object(
content='First part ', role=Role.agent
).model_dump(mode='json', exclude_none=True),
}
mock_stream_response_2_dict: dict[str, Any] = {
'id': 'stream_id_123',
'jsonrpc': '2.0',
'result': create_text_message_object(
content='second part ', role=Role.agent
).model_dump(mode='json', exclude_none=True),
}
sse_event_1 = ServerSentEvent(
data=json.dumps(mock_stream_response_1_dict)
)
sse_event_2 = ServerSentEvent(
data=json.dumps(mock_stream_response_2_dict)
)
mock_event_source = AsyncMock(spec=EventSource)
with patch.object(mock_event_source, 'aiter_sse') as mock_aiter_sse:
mock_aiter_sse.return_value = async_iterable_from_list(
[sse_event_1, sse_event_2]
)
mock_aconnect_sse.return_value.__aenter__.return_value = (
mock_event_source
)
results: list[Any] = []
async for response in client.send_message_streaming(
request=request
):
results.append(response)
assert len(results) == 2
assert isinstance(results[0], SendStreamingMessageResponse)
# Assuming SendStreamingMessageResponse is a RootModel like SendMessageResponse
assert results[0].root.id == 'stream_id_123'
assert (
results[0].root.result.model_dump( # type: ignore
mode='json', exclude_none=True
)
== mock_stream_response_1_dict['result']
)
assert isinstance(results[1], SendStreamingMessageResponse)
assert results[1].root.id == 'stream_id_123'
assert (
results[1].root.result.model_dump( # type: ignore
mode='json', exclude_none=True
)
== mock_stream_response_2_dict['result']
)
mock_aconnect_sse.assert_called_once()
call_args, call_kwargs = mock_aconnect_sse.call_args
assert call_args[0] == mock_httpx_client
assert call_args[1] == 'POST'
assert call_args[2] == mock_agent_card.url
sent_json_payload = call_kwargs['json']
assert sent_json_payload['method'] == 'message/stream'
assert sent_json_payload['params'] == params.model_dump(
mode='json', exclude_none=True
)
assert (
call_kwargs['timeout'] is None
) # Default timeout for streaming
@pytest.mark.asyncio
async def test_get_task_success_use_request(
self, mock_httpx_client: AsyncMock, mock_agent_card: MagicMock
):
client = A2AClient(
httpx_client=mock_httpx_client, agent_card=mock_agent_card
)
task_id_val = 'task_for_req_obj'
params_model = TaskQueryParams(id=task_id_val)
request_obj_id = 789
request = GetTaskRequest(id=request_obj_id, params=params_model)
rpc_response_payload: dict[str, Any] = {
'id': request_obj_id,
'jsonrpc': '2.0',
'result': MINIMAL_TASK,
}
with patch.object(
client, '_send_request', new_callable=AsyncMock
) as mock_send_req:
mock_send_req.return_value = rpc_response_payload
response = await client.get_task(
request=request, http_kwargs={'timeout': 20}
)
assert mock_send_req.call_count == 1
called_args, called_kwargs = mock_send_req.call_args
assert len(called_args) == 2
json_rpc_request_sent: dict[str, Any] = called_args[0]
assert not called_kwargs # no extra kwargs to _send_request
http_kwargs: dict[str, Any] = called_args[1]
assert http_kwargs['timeout'] == 20
assert json_rpc_request_sent['method'] == 'tasks/get'
assert json_rpc_request_sent['id'] == request_obj_id
assert json_rpc_request_sent['params'] == params_model.model_dump(
mode='json', exclude_none=True
)
assert isinstance(response, GetTaskResponse)
assert hasattr(response.root, 'result')
assert (
response.root.result.model_dump(mode='json', exclude_none=True) # type: ignore
== MINIMAL_TASK
)
assert response.root.id == request_obj_id
@pytest.mark.asyncio
async def test_get_task_error_response(
self, mock_httpx_client: AsyncMock, mock_agent_card: MagicMock
):
client = A2AClient(
httpx_client=mock_httpx_client, agent_card=mock_agent_card
)
params_model = TaskQueryParams(id='task_error_case')
request = GetTaskRequest(id='err_req_id', params=params_model)
error_details = InvalidParamsError()
rpc_response_payload: dict[str, Any] = {
'id': 'err_req_id',
'jsonrpc': '2.0',
'error': error_details.model_dump(mode='json', exclude_none=True),
}
with patch.object(
client, '_send_request', new_callable=AsyncMock
) as mock_send_req:
mock_send_req.return_value = rpc_response_payload
response = await client.get_task(request=request)
assert isinstance(response, GetTaskResponse)
assert isinstance(response.root, JSONRPCErrorResponse)
assert response.root.error.model_dump(
mode='json', exclude_none=True
) == error_details.model_dump(exclude_none=True)
assert response.root.id == 'err_req_id'
@pytest.mark.asyncio
async def test_cancel_task_success_use_request(
self, mock_httpx_client: AsyncMock, mock_agent_card: MagicMock
):
client = A2AClient(
httpx_client=mock_httpx_client, agent_card=mock_agent_card
)
task_id_val = MINIMAL_CANCELLED_TASK['id']
params_model = TaskIdParams(id=task_id_val)
request_obj_id = 'cancel_req_obj_id_001'
request = CancelTaskRequest(id=request_obj_id, params=params_model)
rpc_response_payload: dict[str, Any] = {
'id': request_obj_id,
'jsonrpc': '2.0',
'result': MINIMAL_CANCELLED_TASK,
}
with patch.object(
client, '_send_request', new_callable=AsyncMock
) as mock_send_req:
mock_send_req.return_value = rpc_response_payload
response = await client.cancel_task(
request=request, http_kwargs={'timeout': 15}
)
assert mock_send_req.call_count == 1
called_args, called_kwargs = mock_send_req.call_args
assert not called_kwargs # no extra kwargs to _send_request
assert len(called_args) == 2
json_rpc_request_sent: dict[str, Any] = called_args[0]
http_kwargs: dict[str, Any] = called_args[1]
assert http_kwargs['timeout'] == 15
assert json_rpc_request_sent['method'] == 'tasks/cancel'
assert json_rpc_request_sent['id'] == request_obj_id
assert json_rpc_request_sent['params'] == params_model.model_dump(
mode='json', exclude_none=True
)
assert isinstance(response, CancelTaskResponse)
assert isinstance(response.root, CancelTaskSuccessResponse)
assert (
response.root.result.model_dump(mode='json', exclude_none=True) # type: ignore
== MINIMAL_CANCELLED_TASK
)
assert response.root.id == request_obj_id
@pytest.mark.asyncio
async def test_cancel_task_error_response(
self, mock_httpx_client: AsyncMock, mock_agent_card: MagicMock
):
client = A2AClient(
httpx_client=mock_httpx_client, agent_card=mock_agent_card
)
params_model = TaskIdParams(id='task_cancel_error_case')
request = CancelTaskRequest(id='err_cancel_req', params=params_model)
error_details = TaskNotCancelableError()
rpc_response_payload: dict[str, Any] = {
'id': 'err_cancel_req',
'jsonrpc': '2.0',
'error': error_details.model_dump(mode='json', exclude_none=True),
}
with patch.object(
client, '_send_request', new_callable=AsyncMock
) as mock_send_req:
mock_send_req.return_value = rpc_response_payload
response = await client.cancel_task(request=request)
assert isinstance(response, CancelTaskResponse)
assert isinstance(response.root, JSONRPCErrorResponse)
assert response.root.error.model_dump(
mode='json', exclude_none=True
) == error_details.model_dump(exclude_none=True)
assert response.root.id == 'err_cancel_req'