import base64
import pytest
from core.errors import AccessDeniedError, ValidationError
from tools import render_mermaid as render_tool
class FakeKrokiClient:
def __init__(self, png=b"PNG"):
self.png = png
self.calls = []
async def render_mermaid_png(self, mermaid: str) -> bytes:
self.calls.append(mermaid)
return self.png
def test_sanitize_filename_stem():
assert render_tool._sanitize_filename_stem("Hello world!") == "Hello_world"
assert render_tool._sanitize_filename_stem(" ") == "diagram"
def test_safe_out_dir_denies_escape(tmp_path, monkeypatch):
monkeypatch.setattr(render_tool, "PROJECT_ROOT", tmp_path)
monkeypatch.setattr(render_tool, "DIAGRAM_OUT_DIR", "../outside")
with pytest.raises(AccessDeniedError):
render_tool._safe_out_dir()
def test_safe_out_dir_allows_inside(tmp_path, monkeypatch):
monkeypatch.setattr(render_tool, "PROJECT_ROOT", tmp_path)
monkeypatch.setattr(render_tool, "DIAGRAM_OUT_DIR", "diagrams")
out = render_tool._safe_out_dir()
assert str(out).startswith(str(tmp_path))
@pytest.mark.asyncio
async def test_render_mermaid_tool_writes_png_and_returns_image_content(tmp_path, monkeypatch, dummy_mcp):
# Force output dir inside tmp_path
monkeypatch.setattr(render_tool, "PROJECT_ROOT", tmp_path)
monkeypatch.setattr(render_tool, "DIAGRAM_OUT_DIR", "diagrams")
fake = FakeKrokiClient(png=b"PNG_BYTES")
render_tool.register(dummy_mcp, kroki_client=fake)
fn = dummy_mcp.tools["render_mermaid"]
img = await fn("flowchart TD; A-->B", title="My Diagram")
assert img.mimeType == "image/png"
assert base64.b64decode(img.data.encode("ascii")) == b"PNG_BYTES"
written = tmp_path / "diagrams" / "My_Diagram.png"
assert written.exists()
assert written.read_bytes() == b"PNG_BYTES"
@pytest.mark.asyncio
async def test_render_mermaid_tool_empty_code_raises(tmp_path, monkeypatch, dummy_mcp):
monkeypatch.setattr(render_tool, "PROJECT_ROOT", tmp_path)
monkeypatch.setattr(render_tool, "DIAGRAM_OUT_DIR", "diagrams")
fake = FakeKrokiClient()
render_tool.register(dummy_mcp, kroki_client=fake)
fn = dummy_mcp.tools["render_mermaid"]
with pytest.raises(ValidationError):
await fn(" ", title="X")
