Add enterprise appliance experience Phase 1 foundation

tests/conftest.py

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+from __future__ import annotations
+
+import importlib.util
+import os
+from pathlib import Path
+
+import pytest
+
+
+REPO_ROOT = Path(__file__).resolve().parents[1]
+BACKEND_MAIN = REPO_ROOT / "ansible/roles/cezen-backend/files/main.py"
+
+
+@pytest.fixture
+def isolated_appliance(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> dict[str, Path]:
+    """Return isolated appliance paths and never touch /opt/cezen."""
+    data = tmp_path / "data"
+    backups = tmp_path / "backups"
+    data.mkdir()
+    backups.mkdir()
+    monkeypatch.setenv("CEZEN_DATA", str(data))
+    monkeypatch.setenv("CEZEN_BACKUP_DIR", str(backups))
+    monkeypatch.setenv("CEZEN_LICENSE_JSON", str(tmp_path / "license.json"))
+    return {"root": tmp_path, "data": data, "backups": backups}
+
+
+def load_backend_module(module_name: str = "cezen_backend_test"):
+    """Load the packaged backend only after fixtures set environment variables."""
+    spec = importlib.util.spec_from_file_location(module_name, BACKEND_MAIN)
+    if spec is None or spec.loader is None:
+        raise RuntimeError(f"Cannot load backend from {BACKEND_MAIN}")
+    module = importlib.util.module_from_spec(spec)
+    spec.loader.exec_module(module)
+    return module