Full rearchitecture using Claude

- event bus systen
- all components are independent
- preparation for web frontend

python-backend/tests/conftest.py

@@ -0,0 +1,39 @@
+from __future__ import annotations
+
+from pathlib import Path
+from typing import Any
+
+import pytest
+from ruamel.yaml import YAML
+
+VALID_CONFIG: dict[str, Any] = {
+    "general": {
+        "figure_folder": "music",
+        "serial_port": "/dev/ttyUSB0",
+        "min_volume": 0,
+        "max_volume": 60,
+        "initial_volume": 40,
+    },
+    "figures": {
+        "fuchs": {"id": "04a1b2c3d4", "colors": ["#ff6600", "#ffcc00", "#331100", "wff"]},
+        "eule": {"id": "04b2c3d4e5", "colors": ["#3355ff", "#66aaff", "#001133", "#ffffff"]},
+    },
+}
+
+
+@pytest.fixture
+def config_dir(tmp_path: Path) -> Path:
+    """A directory with a valid ``music/`` tree and two figures' worth of tracks."""
+    for figure, tracks in (("fuchs", 3), ("eule", 2)):
+        folder = tmp_path / "music" / figure
+        folder.mkdir(parents=True)
+        for index in range(tracks):
+            (folder / f"{index:02d} - track.mp3").write_bytes(b"")
+    return tmp_path
+
+
+def write_config(directory: Path, data: dict[str, Any], name: str = "config.yml") -> Path:
+    path = directory / name
+    with path.open("w", encoding="utf-8") as handle:
+        YAML(typ="safe").dump(data, handle)
+    return path