added ruff test

shared/tests/test_scene3d_assets.py

@@ -16,16 +16,14 @@ from pathlib import Path
 
 import numpy as np
 import pytest
-
 from orisys_app_shared.scene3d import synthetic
 from orisys_app_shared.scene3d.contracts import (
-    ExpectedGeometry,
     Material,
     MeshPart,
     SceneAssets,
     ThreeDError,
-    validate_assets,
     freeze,
+    validate_assets,
 )
 from orisys_app_shared.scene3d.digest import (
     asset_hash,
@@ -414,7 +412,6 @@ def test_normals_disagree_with_faces_detects_the_defect():
 def test_the_shipped_housing_has_no_stale_shading():
     """The real housing: 134 of 2172 edges are creases, so plain averaging bands."""
     import io
-    import zipfile
 
     package = (
         Path(__file__).resolve().parents[2]