"""Tests for unified server tool dispatch exception handling.
Tests that _dispatch_server_action catches exceptions and returns error responses
instead of crashing the MCP server.
"""
from unittest.mock import MagicMock, patch
import pytest
@pytest.fixture
def mock_config():
"""Create a mock ServerConfig."""
config = MagicMock()
return config
class TestServerDispatchExceptionHandling:
"""Tests for _dispatch_server_action exception handling."""
def test_dispatch_catches_exceptions(self, mock_config):
"""_dispatch_server_action should catch exceptions and return error response."""
from foundry_mcp.tools.unified.server import _dispatch_server_action
with patch(
"foundry_mcp.tools.unified.server._SERVER_ROUTER"
) as mock_router:
mock_router.dispatch.side_effect = RuntimeError("Server introspection failed")
result = _dispatch_server_action(
action="info",
payload={},
config=mock_config,
)
# Should return error response, not raise exception
assert result["success"] is False
assert "Server introspection failed" in result["error"]
assert result["data"]["error_type"] == "internal"
assert result["data"]["details"]["action"] == "info"
assert result["data"]["details"]["error_type"] == "RuntimeError"
def test_dispatch_handles_empty_exception_message(self, mock_config):
"""_dispatch_server_action should handle exceptions with empty messages."""
from foundry_mcp.tools.unified.server import _dispatch_server_action
with patch(
"foundry_mcp.tools.unified.server._SERVER_ROUTER"
) as mock_router:
mock_router.dispatch.side_effect = RuntimeError()
result = _dispatch_server_action(
action="info",
payload={},
config=mock_config,
)
# Should use class name when message is empty
assert result["success"] is False
assert "RuntimeError" in result["error"]
def test_dispatch_logs_exception(self, mock_config, caplog):
"""_dispatch_server_action should log exceptions."""
import logging
from foundry_mcp.tools.unified.server import _dispatch_server_action
with caplog.at_level(logging.ERROR):
with patch(
"foundry_mcp.tools.unified.server._SERVER_ROUTER"
) as mock_router:
mock_router.dispatch.side_effect = ValueError("test error")
_dispatch_server_action(
action="info",
payload={},
config=mock_config,
)
assert "test error" in caplog.text
