adk-python/tests/unittests/agents/test_agent_callbacks.py

# Copyright 2025 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from typing import Any
from typing import Optional

from google.adk.agents.callback_context import CallbackContext
from google.adk.agents.llm_agent import Agent
from google.adk.models import LlmRequest
from google.adk.models import LlmResponse
from google.genai import types
from google.genai import types
from pydantic import BaseModel
import pytest

from .. import utils


class MockAgentCallback(BaseModel):
  mock_response: str

  def __call__(
      self,
      callback_context: CallbackContext,
  ) -> types.Content:
    return types.Content(parts=[types.Part(text=self.mock_response)])


class MockAsyncAgentCallback(BaseModel):
  mock_response: str

  async def __call__(
      self,
      callback_context: CallbackContext,
  ) -> types.Content:
    return types.Content(parts=[types.Part(text=self.mock_response)])


def noop_callback(**kwargs) -> Optional[LlmResponse]:
  pass


async def async_noop_callback(**kwargs) -> Optional[LlmResponse]:
  pass


@pytest.mark.asyncio
async def test_before_agent_callback():
  responses = ['agent_response']
  mock_model = utils.MockModel.create(responses=responses)
  agent = Agent(
      name='root_agent',
      model=mock_model,
      before_agent_callback=MockAgentCallback(
          mock_response='before_agent_callback'
      ),
  )

  runner = utils.TestInMemoryRunner(agent)
  assert utils.simplify_events(
      await runner.run_async_with_new_session('test')
  ) == [
      ('root_agent', 'before_agent_callback'),
  ]


@pytest.mark.asyncio
async def test_after_agent_callback():
  responses = ['agent_response']
  mock_model = utils.MockModel.create(responses=responses)
  agent = Agent(
      name='root_agent',
      model=mock_model,
      after_agent_callback=MockAgentCallback(
          mock_response='after_agent_callback'
      ),
  )

  runner = utils.TestInMemoryRunner(agent)
  assert utils.simplify_events(
      await runner.run_async_with_new_session('test')
  ) == [
      ('root_agent', 'agent_response'),
      ('root_agent', 'after_agent_callback'),
  ]


@pytest.mark.asyncio
async def test_before_agent_callback_noop():
  responses = ['agent_response']
  mock_model = utils.MockModel.create(responses=responses)
  agent = Agent(
      name='root_agent',
      model=mock_model,
      before_agent_callback=noop_callback,
  )

  runner = utils.TestInMemoryRunner(agent)
  assert utils.simplify_events(
      await runner.run_async_with_new_session('test')
  ) == [
      ('root_agent', 'agent_response'),
  ]


@pytest.mark.asyncio
async def test_after_agent_callback_noop():
  responses = ['agent_response']
  mock_model = utils.MockModel.create(responses=responses)
  agent = Agent(
      name='root_agent',
      model=mock_model,
      before_agent_callback=noop_callback,
  )

  runner = utils.TestInMemoryRunner(agent)
  assert utils.simplify_events(
      await runner.run_async_with_new_session('test')
  ) == [
      ('root_agent', 'agent_response'),
  ]


@pytest.mark.asyncio
async def test_async_before_agent_callback():
  responses = ['agent_response']
  mock_model = utils.MockModel.create(responses=responses)
  agent = Agent(
      name='root_agent',
      model=mock_model,
      before_agent_callback=MockAsyncAgentCallback(
          mock_response='async_before_agent_callback'
      ),
  )

  runner = utils.TestInMemoryRunner(agent)
  assert utils.simplify_events(
      await runner.run_async_with_new_session('test')
  ) == [
      ('root_agent', 'async_before_agent_callback'),
  ]


@pytest.mark.asyncio
async def test_async_after_agent_callback():
  responses = ['agent_response']
  mock_model = utils.MockModel.create(responses=responses)
  agent = Agent(
      name='root_agent',
      model=mock_model,
      after_agent_callback=MockAsyncAgentCallback(
          mock_response='async_after_agent_callback'
      ),
  )

  runner = utils.TestInMemoryRunner(agent)
  assert utils.simplify_events(
      await runner.run_async_with_new_session('test')
  ) == [
      ('root_agent', 'agent_response'),
      ('root_agent', 'async_after_agent_callback'),
  ]


@pytest.mark.asyncio
async def test_async_before_agent_callback_noop():
  responses = ['agent_response']
  mock_model = utils.MockModel.create(responses=responses)
  agent = Agent(
      name='root_agent',
      model=mock_model,
      before_agent_callback=async_noop_callback,
  )

  runner = utils.TestInMemoryRunner(agent)
  assert utils.simplify_events(
      await runner.run_async_with_new_session('test')
  ) == [
      ('root_agent', 'agent_response'),
  ]


@pytest.mark.asyncio
async def test_async_after_agent_callback_noop():
  responses = ['agent_response']
  mock_model = utils.MockModel.create(responses=responses)
  agent = Agent(
      name='root_agent',
      model=mock_model,
      before_agent_callback=async_noop_callback,
  )

  runner = utils.TestInMemoryRunner(agent)
  assert utils.simplify_events(
      await runner.run_async_with_new_session('test')
  ) == [
      ('root_agent', 'agent_response'),
  ]