mirror of
https://github.com/aljazceru/mcp-python-sdk.git
synced 2025-12-19 14:54:24 +01:00
8ff4b5e9d3
The server was ignoring mime types set on resources, defaulting to text/plain for strings and application/octet-stream for bytes. Now properly preserves the specified mime type in both FastMCP and low-level server implementations. Note that this is breaks backwards compatibility as it changes the return values of read_resource() on FastMCP. It is BC compatible on lowlevel since it only extends the callback. Github-Issue: #152 Reported-by: eiseleMichael
124 lines
3.3 KiB
Python
124 lines
3.3 KiB
Python
import json
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from pathlib import Path
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import pytest
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from mcp.server.fastmcp import FastMCP
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@pytest.fixture()
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def test_dir(tmp_path_factory) -> Path:
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"""Create a temporary directory with test files."""
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tmp = tmp_path_factory.mktemp("test_files")
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# Create test files
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(tmp / "example.py").write_text("print('hello world')")
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(tmp / "readme.md").write_text("# Test Directory\nThis is a test.")
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(tmp / "config.json").write_text('{"test": true}')
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return tmp
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@pytest.fixture
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def mcp() -> FastMCP:
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mcp = FastMCP()
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return mcp
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@pytest.fixture(autouse=True)
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def resources(mcp: FastMCP, test_dir: Path) -> FastMCP:
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@mcp.resource("dir://test_dir")
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def list_test_dir() -> list[str]:
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"""List the files in the test directory"""
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return [str(f) for f in test_dir.iterdir()]
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@mcp.resource("file://test_dir/example.py")
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def read_example_py() -> str:
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"""Read the example.py file"""
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try:
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return (test_dir / "example.py").read_text()
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except FileNotFoundError:
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return "File not found"
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@mcp.resource("file://test_dir/readme.md")
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def read_readme_md() -> str:
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"""Read the readme.md file"""
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try:
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return (test_dir / "readme.md").read_text()
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except FileNotFoundError:
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return "File not found"
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@mcp.resource("file://test_dir/config.json")
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def read_config_json() -> str:
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"""Read the config.json file"""
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try:
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return (test_dir / "config.json").read_text()
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except FileNotFoundError:
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return "File not found"
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return mcp
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@pytest.fixture(autouse=True)
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def tools(mcp: FastMCP, test_dir: Path) -> FastMCP:
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@mcp.tool()
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def delete_file(path: str) -> bool:
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# ensure path is in test_dir
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if Path(path).resolve().parent != test_dir:
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raise ValueError(f"Path must be in test_dir: {path}")
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Path(path).unlink()
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return True
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return mcp
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@pytest.mark.anyio
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async def test_list_resources(mcp: FastMCP):
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resources = await mcp.list_resources()
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assert len(resources) == 4
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assert [str(r.uri) for r in resources] == [
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"dir://test_dir",
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"file://test_dir/example.py",
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"file://test_dir/readme.md",
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"file://test_dir/config.json",
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]
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@pytest.mark.anyio
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async def test_read_resource_dir(mcp: FastMCP):
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files, mime_type = await mcp.read_resource("dir://test_dir")
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assert mime_type == "text/plain"
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files = json.loads(files)
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assert sorted([Path(f).name for f in files]) == [
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"config.json",
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"example.py",
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"readme.md",
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]
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@pytest.mark.anyio
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async def test_read_resource_file(mcp: FastMCP):
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result, _ = await mcp.read_resource("file://test_dir/example.py")
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assert result == "print('hello world')"
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@pytest.mark.anyio
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async def test_delete_file(mcp: FastMCP, test_dir: Path):
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await mcp.call_tool(
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"delete_file", arguments=dict(path=str(test_dir / "example.py"))
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)
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assert not (test_dir / "example.py").exists()
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@pytest.mark.anyio
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async def test_delete_file_and_check_resources(mcp: FastMCP, test_dir: Path):
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await mcp.call_tool(
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"delete_file", arguments=dict(path=str(test_dir / "example.py"))
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)
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result, _ = await mcp.read_resource("file://test_dir/example.py")
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assert result == "File not found"
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