wehub-resource-sync
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63 lines
2.6 KiB
Python
63 lines
2.6 KiB
Python
"""Client.listen against MCPServer over the connect matrix (2026-07-28)."""
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import anyio
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import pytest
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from mcp.client.subscriptions import ListenNotSupportedError, ResourceUpdated, ToolsListChanged
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from mcp.server.mcpserver import Context, MCPServer
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from tests.interaction._connect import Connect
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from tests.interaction._requirements import requirement
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pytestmark = pytest.mark.anyio
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def _notebook() -> MCPServer:
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mcp = MCPServer("notebook")
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@mcp.tool()
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async def touch_tools(ctx: Context) -> str:
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await ctx.notify_tools_changed()
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return "ok"
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@mcp.tool()
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async def edit_note(name: str, ctx: Context) -> str:
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await ctx.notify_resource_updated(f"note://{name}")
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return "saved"
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return mcp
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@requirement("subscriptions:listen:client:honored-surfacing")
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@requirement("subscriptions:listen:client:iteration")
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async def test_listen_surfaces_the_ack_and_iterates_typed_events(connect: Connect) -> None:
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"""Entering waits for the ack (honored is set before any event); iteration yields
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only the typed event kinds this stream opted in to."""
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mcp = _notebook()
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async with connect(mcp) as client:
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with anyio.fail_after(10):
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async with client.listen( # pragma: no branch
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tools_list_changed=True, resource_subscriptions=["note://todo"]
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) as sub:
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assert sub.honored.tools_list_changed is True
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assert sub.honored.resource_subscriptions == ["note://todo"]
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await client.call_tool("edit_note", {"name": "journal"}) # unsubscribed URI: silent
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await client.call_tool("edit_note", {"name": "todo"})
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assert await anext(sub) == ResourceUpdated(uri="note://todo")
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await client.call_tool("touch_tools", {})
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assert await anext(sub) == ToolsListChanged()
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@requirement("subscriptions:listen:client:era-guard")
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async def test_listen_on_a_pre_2026_connection_raises_the_typed_steer(connect: Connect) -> None:
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"""On 2025-era connections the guard fires before anything touches the wire, steering to the legacy verbs."""
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mcp = _notebook()
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async with connect(mcp) as client:
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with anyio.fail_after(10):
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# Entering is where the guard fires; __aenter__ directly avoids an unreachable with-body.
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with pytest.raises(ListenNotSupportedError) as exc_info:
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await client.listen(tools_list_changed=True).__aenter__()
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assert exc_info.value.negotiated_version == client.session.protocol_version
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assert "subscribe_resource" in str(exc_info.value)
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