101 lines
3.5 KiB
Python
101 lines
3.5 KiB
Python
"""Tests for MCP tool structured_content preservation."""
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import json
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from types import SimpleNamespace
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from unittest.mock import AsyncMock, MagicMock, patch
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import pytest
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from tools import mcp_tool
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class _FakeContentBlock:
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"""Minimal content block with .text and .type attributes."""
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def __init__(self, text: str, block_type: str = "text"):
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self.text = text
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self.type = block_type
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class _FakeCallToolResult:
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"""Minimal CallToolResult stand-in."""
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def __init__(self, content, is_error=False, structured_content=None):
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self.content = content
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self.isError = is_error
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self.structured_content = structured_content
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@pytest.fixture
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def _patch_mcp_server():
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"""Patch _servers and the MCP event loop so _make_tool_handler can run."""
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fake_session = MagicMock()
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fake_server = SimpleNamespace(session=fake_session)
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with patch.dict(mcp_tool._servers, {"test-server": fake_server}):
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yield fake_session
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class TestStructuredContentPreservation:
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"""Ensure structured_content from CallToolResult is forwarded."""
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def test_text_only_result(self, _patch_mcp_server):
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"""When no structured_content, result is text-only (existing behaviour)."""
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session = _patch_mcp_server
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session.call_tool = AsyncMock(
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return_value=_FakeCallToolResult(
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content=[_FakeContentBlock("hello")],
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)
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)
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handler = mcp_tool._make_tool_handler("test-server", "my-tool", 30.0)
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raw = handler({})
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data = json.loads(raw)
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assert data == {"result": "hello"}
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assert "structuredContent" not in data
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def test_structured_content_included(self, _patch_mcp_server):
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"""When structured_content is present, it must appear in the response."""
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session = _patch_mcp_server
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payload = {"value": "secret-123", "revealed": True}
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session.call_tool = AsyncMock(
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return_value=_FakeCallToolResult(
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content=[_FakeContentBlock("OK")],
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structured_content=payload,
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)
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)
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handler = mcp_tool._make_tool_handler("test-server", "my-tool", 30.0)
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raw = handler({})
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data = json.loads(raw)
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assert data["result"] == "OK"
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assert data["structuredContent"] == payload
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def test_structured_content_none_omitted(self, _patch_mcp_server):
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"""When structured_content is explicitly None, key is omitted."""
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session = _patch_mcp_server
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session.call_tool = AsyncMock(
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return_value=_FakeCallToolResult(
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content=[_FakeContentBlock("done")],
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structured_content=None,
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)
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)
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handler = mcp_tool._make_tool_handler("test-server", "my-tool", 30.0)
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raw = handler({})
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data = json.loads(raw)
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assert data == {"result": "done"}
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assert "structuredContent" not in data
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def test_empty_text_with_structured_content(self, _patch_mcp_server):
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"""When content blocks are empty but structured_content exists."""
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session = _patch_mcp_server
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payload = {"status": "ok", "data": [1, 2, 3]}
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session.call_tool = AsyncMock(
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return_value=_FakeCallToolResult(
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content=[],
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structured_content=payload,
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)
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)
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handler = mcp_tool._make_tool_handler("test-server", "my-tool", 30.0)
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raw = handler({})
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data = json.loads(raw)
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assert data["result"] == ""
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assert data["structuredContent"] == payload
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