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63 lines
2.5 KiB
Python
63 lines
2.5 KiB
Python
"""`docs/handlers/logging.md`: every claim the page makes, proved against the real SDK."""
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import logging
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import pytest
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from inline_snapshot import snapshot
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from mcp_types import CallToolResult, TextContent
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from docs_src.logging import tutorial001
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from mcp import Client
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from mcp.server import MCPServer
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# See test_index.py for why this is a per-module mark and not a conftest hook.
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pytestmark = [pytest.mark.anyio, pytest.mark.filterwarnings("error::mcp.MCPDeprecationWarning")]
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async def test_the_tool_logs_through_the_standard_library(caplog: pytest.LogCaptureFixture) -> None:
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"""tutorial001: `logger.info(...)` inside a tool emits an ordinary stdlib record named after the module."""
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caplog.set_level(logging.INFO)
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async with Client(tutorial001.mcp) as client:
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await client.call_tool("search_books", {"query": "dune"})
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(record,) = list(filter(lambda r: r.name == tutorial001.logger.name, caplog.records))
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assert record.levelname == "INFO"
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assert record.getMessage() == "Searching for 'dune'"
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async def test_the_log_line_never_reaches_the_client() -> None:
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"""tutorial001: the result is only the return value. Log output is invisible to the model."""
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async with Client(tutorial001.mcp) as client:
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result = await client.call_tool("search_books", {"query": "dune"})
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assert result == snapshot(
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CallToolResult(
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content=[TextContent(type="text", text="Found 3 books matching 'dune'.")],
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structured_content={"result": "Found 3 books matching 'dune'."},
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)
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)
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def test_log_level_configures_the_root_logger() -> None:
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"""`MCPServer(log_level=...)` calls `logging.basicConfig()` when nothing has configured logging yet."""
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root = logging.getLogger()
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handlers, level = root.handlers[:], root.level
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root.handlers = []
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try:
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MCPServer("Bookshop", log_level="DEBUG")
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assert root.level == logging.DEBUG
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assert len(root.handlers) == 1
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finally:
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root.handlers, root.level = handlers, level
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def test_an_existing_logging_configuration_wins() -> None:
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"""`logging.basicConfig()` is a no-op once a handler is installed, so your own setup is not overridden."""
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root = logging.getLogger()
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handlers, level = root.handlers[:], root.level
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root.handlers, root.level = [logging.NullHandler()], logging.WARNING
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try:
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MCPServer("Bookshop", log_level="DEBUG")
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assert root.level == logging.WARNING
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assert len(root.handlers) == 1
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finally:
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root.handlers, root.level = handlers, level
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