151 lines
5.5 KiB
Python
151 lines
5.5 KiB
Python
"""Direct-handler tests for the auto-derived `server/discover` handler.
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These call the registered handler via the public `Server.get_request_handler`
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accessor without spinning up a `ServerRunner` or any transport, so they verify
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the handler's contract in isolation from the dispatch pipeline.
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"""
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import importlib.metadata
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from typing import Any, cast
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import pytest
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from mcp import types
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from mcp.server import Server, ServerRequestContext
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from mcp.shared.version import MODERN_PROTOCOL_VERSIONS
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# `Server._handle_discover` ignores its `ctx` argument entirely (it derives the
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# result from server state), so a sentinel keeps the call site type-correct
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# without dragging session machinery into a unit test.
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_UNUSED_CTX = cast("ServerRequestContext[Any]", None)
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async def _discover(server: Server[Any]) -> types.DiscoverResult:
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entry = server.get_request_handler("server/discover")
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assert entry is not None
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result = await entry.handler(_UNUSED_CTX, types.RequestParams())
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assert isinstance(result, types.DiscoverResult)
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return result
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def test_registered_by_default() -> None:
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"""SDK-defined: a bare `Server` registers a `server/discover` handler out of
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the box, typed for the base `RequestParams`."""
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server = Server("test-server")
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entry = server.get_request_handler("server/discover")
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assert entry is not None
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assert entry.params_type is types.RequestParams
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@pytest.mark.anyio
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async def test_supported_versions_is_modern_set() -> None:
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"""`supportedVersions` is exactly the modern envelope set, not the full
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legacy-compat list (D-008)."""
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result = await _discover(Server("test-server"))
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assert result.supported_versions == list(MODERN_PROTOCOL_VERSIONS)
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@pytest.mark.anyio
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async def test_server_info_reflects_constructor_fields() -> None:
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"""SDK-defined: `serverInfo` is built field-for-field from the `Server`
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constructor arguments."""
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icons = [types.Icon(src="https://example.test/icon.png")]
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server = Server(
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"info-server",
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version="9.9.9",
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title="Info Server",
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description="A server for testing discover.",
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website_url="https://example.test",
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icons=icons,
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)
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result = await _discover(server)
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assert result.server_info == types.Implementation(
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name="info-server",
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version="9.9.9",
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title="Info Server",
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description="A server for testing discover.",
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website_url="https://example.test",
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icons=icons,
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)
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@pytest.mark.anyio
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async def test_server_info_version_falls_back_to_package() -> None:
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"""SDK-defined: when no explicit version is supplied, `serverInfo.version`
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falls back to the installed `mcp` package version."""
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result = await _discover(Server("unversioned"))
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assert result.server_info.version == importlib.metadata.version("mcp")
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@pytest.mark.anyio
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async def test_instructions_threaded_through() -> None:
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"""SDK-defined: the `instructions` constructor argument is passed through
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verbatim, defaulting to `None` when omitted."""
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server = Server("inst-server", instructions="Read the docs first.")
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result = await _discover(server)
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assert result.instructions == "Read the docs first."
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bare = await _discover(Server("bare"))
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assert bare.instructions is None
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@pytest.mark.anyio
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async def test_capabilities_derived_from_registered_handlers() -> None:
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"""SDK-defined: capabilities are computed at handler call time from the
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live registry, so post-construction `add_request_handler` calls are
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reflected."""
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async def list_tools(
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ctx: ServerRequestContext[Any], params: types.PaginatedRequestParams | None
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) -> types.ListToolsResult:
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raise NotImplementedError
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async def list_prompts(
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ctx: ServerRequestContext[Any], params: types.PaginatedRequestParams | None
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) -> types.ListPromptsResult:
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raise NotImplementedError
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server = Server("cap-server", on_list_tools=list_tools)
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before = await _discover(server)
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assert before.capabilities.tools is not None
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assert before.capabilities.prompts is None
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server.add_request_handler("prompts/list", types.PaginatedRequestParams, list_prompts)
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after = await _discover(server)
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assert after.capabilities.tools is not None
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assert after.capabilities.prompts is not None
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@pytest.mark.anyio
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async def test_discover_result_defaults_to_immediately_stale_private_cache() -> None:
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"""SDK-defined: `DiscoverResult` is cacheable; the auto-derived handler
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relies on the model defaults (immediately-stale, private)."""
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result = await _discover(Server("cache-server"))
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assert result.ttl_ms == 0
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assert result.cache_scope == "private"
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@pytest.mark.anyio
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async def test_overridable_via_add_request_handler() -> None:
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"""SDK-defined: a custom `server/discover` handler registered via
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`add_request_handler` replaces the auto-derived default wholesale."""
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server = Server("custom-server", version="1.0.0")
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custom = types.DiscoverResult(
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supported_versions=list(MODERN_PROTOCOL_VERSIONS),
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capabilities=types.ServerCapabilities(),
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server_info=types.Implementation(name="custom-server", version="1.0.0"),
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instructions="overridden",
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ttl_ms=60_000,
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cache_scope="public",
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)
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async def custom_discover(
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ctx: ServerRequestContext[Any], params: types.RequestParams | None
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) -> types.DiscoverResult:
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return custom
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server.add_request_handler("server/discover", types.RequestParams, custom_discover)
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result = await _discover(server)
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assert result is custom
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