python-sdk/tests/server/mcpserver/resources/test_resource_manager.py at 28303efcd0ad0860275e6b2d2be9c8bb3703c5ff · mplemay/python-sdk · GitHub

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import logging
from pathlib import Path

import pytest
from pydantic import AnyUrl

from mcp.server.mcpserver import Context
from mcp.server.mcpserver.resources import FileResource, FunctionResource, ResourceManager, ResourceTemplate


@pytest.fixture()
def temp_file(tmp_path: Path):
    """Create a temporary file for testing.

    File is automatically cleaned up after the test if it still exists.
    """
    tmp_file = tmp_path / "file"
    tmp_file.touch()
    yield tmp_file


def test_init_with_resources(temp_file: Path, caplog: pytest.LogCaptureFixture):
    resource = FileResource(uri=f"file://{temp_file}", name="test", path=temp_file)
    manager = ResourceManager(resources=[resource])
    assert manager.list_resources() == [resource]

    duplicate_resource = FileResource(uri=f"file://{temp_file}", name="duplicate", path=temp_file)

    with caplog.at_level(logging.WARNING):
        manager = ResourceManager(True, resources=[resource, duplicate_resource])

    assert "Resource already exists" in caplog.text
    assert manager.list_resources() == [resource]


def test_add_resource(temp_file: Path):
    """Test adding a resource."""
    manager = ResourceManager()
    resource = FileResource(uri=f"file://{temp_file}", name="test", path=temp_file)
    added = manager.add_resource(resource)
    assert added == resource
    assert manager.list_resources() == [resource]


def test_add_duplicate_resource(temp_file: Path):
    """Test adding the same resource twice."""
    manager = ResourceManager()
    resource = FileResource(uri=f"file://{temp_file}", name="test", path=temp_file)
    first = manager.add_resource(resource)
    second = manager.add_resource(resource)
    assert first == second
    assert manager.list_resources() == [resource]


def test_warn_on_duplicate_resources(temp_file: Path, caplog: pytest.LogCaptureFixture):
    """Test warning on duplicate resources."""
    manager = ResourceManager()
    resource = FileResource(uri=f"file://{temp_file}", name="test", path=temp_file)
    manager.add_resource(resource)
    manager.add_resource(resource)
    assert "Resource already exists" in caplog.text


def test_disable_warn_on_duplicate_resources(temp_file: Path, caplog: pytest.LogCaptureFixture):
    """Test disabling warning on duplicate resources."""
    manager = ResourceManager(warn_on_duplicate_resources=False)
    resource = FileResource(uri=f"file://{temp_file}", name="test", path=temp_file)
    manager.add_resource(resource)
    manager.add_resource(resource)
    assert "Resource already exists" not in caplog.text


@pytest.mark.anyio
async def test_get_resource(temp_file: Path):
    """Test getting a resource by URI."""
    manager = ResourceManager()
    resource = FileResource(uri=f"file://{temp_file}", name="test", path=temp_file)
    manager.add_resource(resource)
    retrieved = await manager.get_resource(resource.uri, Context())
    assert retrieved == resource


@pytest.mark.anyio
async def test_get_resource_from_template():
    """Test getting a resource through a template."""
    manager = ResourceManager()

    def greet(name: str) -> str:
        return f"Hello, {name}!"

    template = ResourceTemplate.from_function(fn=greet, uri_template="greet://{name}", name="greeter")
    manager._templates[template.uri_template] = template

    resource = await manager.get_resource(AnyUrl("greet://world"), Context())
    assert isinstance(resource, FunctionResource)
    content = await resource.read()
    assert content == "Hello, world!"


@pytest.mark.anyio
async def test_get_unknown_resource():
    """Test getting a non-existent resource."""
    manager = ResourceManager()
    with pytest.raises(ValueError, match="Unknown resource"):
        await manager.get_resource(AnyUrl("unknown://test"), Context())


def test_list_resources(temp_file: Path):
    """Test listing all resources."""
    manager = ResourceManager()
    resource1 = FileResource(uri=f"file://{temp_file}", name="test1", path=temp_file)
    resource2 = FileResource(uri=f"file://{temp_file}2", name="test2", path=temp_file)

    manager.add_resource(resource1)
    manager.add_resource(resource2)

    resources = manager.list_resources()
    assert len(resources) == 2
    assert resources == [resource1, resource2]


def get_item(id: str) -> str: ...


def test_add_template_with_metadata():
    """Test that ResourceManager.add_template() accepts and passes meta parameter."""
    manager = ResourceManager()
    metadata = {"source": "database", "cached": True}
    template = manager.add_template(fn=get_item, uri_template="resource://items/{id}", meta=metadata)

    assert template.meta is not None
    assert template.meta == metadata
    assert template.meta["source"] == "database"
    assert template.meta["cached"] is True


def test_add_template_without_metadata():
    """Test that ResourceManager.add_template() works without meta parameter."""
    manager = ResourceManager()
    template = manager.add_template(fn=get_item, uri_template="resource://items/{id}")
    assert template.meta is None