feat: add endpoint to generate memory from session

Merge https://github.com/google/adk-python/pull/2900

In relation with #2416

COPYBARA_INTEGRATE_REVIEW=https://github.com/google/adk-python/pull/2900 from guillaumeblaquiere:add-session-to-memory 0507de43021c62f9223167dca8f53b536227ad04
PiperOrigin-RevId: 808658162

tests/unittests/cli/test_fast_api.py

@@ -22,6 +22,7 @@ import tempfile
 import time
 from typing import Any
 from typing import Optional
+from unittest.mock import AsyncMock
 from unittest.mock import MagicMock
 from unittest.mock import patch
 
@@ -344,7 +345,7 @@ def mock_artifact_service():
 @pytest.fixture
 def mock_memory_service():
   """Create a mock memory service."""
-  return MagicMock()
+  return AsyncMock()
 
 
 @pytest.fixture
@@ -939,5 +940,18 @@ def test_a2a_disabled_by_default(test_app):
   logger.info("A2A disabled by default test passed")
 
 
+def test_patch_memory(test_app, create_test_session, mock_memory_service):
+  """Test adding a session to memory."""
+  info = create_test_session
+  url = f"/apps/{info['app_name']}/users/{info['user_id']}/memory"
+  payload = {"session_id": info["session_id"]}
+  response = test_app.patch(url, json=payload)
+
+  # Verify the response
+  assert response.status_code == 200
+  mock_memory_service.add_session_to_memory.assert_called_once()
+  logger.info("Add session to memory test completed successfully")
+
+
 if __name__ == "__main__":
   pytest.main(["-xvs", __file__])