chore: snapshot workflow migration progress

backend/tests/test_export_glb_task.py

@@ -0,0 +1,63 @@
+from __future__ import annotations
+
+import uuid
+from pathlib import Path
+
+import app.models  # noqa: F401  Ensures SQLAlchemy relationships are registered.
+
+from app.domains.media.models import MediaAsset, MediaAssetType
+from app.domains.pipeline.tasks.export_glb import _usd_cache_hit_refresh_reason
+from app.domains.products.models import CadFile
+
+
+def _build_cad_file() -> CadFile:
+    return CadFile(
+        id=uuid.uuid4(),
+        original_name="bearing.step",
+        stored_path="/tmp/bearing.step",
+        file_hash=f"hash-{uuid.uuid4().hex}",
+        resolved_material_assignments={
+            "inner_ring": {
+                "source_name": "InnerRing",
+                "prim_path": "/Root/Assembly/inner_ring",
+                "canonical_material": "HARTOMAT_010101_Steel-Bare",
+            }
+        },
+    )
+
+
+def _build_usd_asset() -> MediaAsset:
+    return MediaAsset(
+        id=uuid.uuid4(),
+        cad_file_id=uuid.uuid4(),
+        asset_type=MediaAssetType.usd_master,
+        storage_key="step_files/bearing_master.usd",
+        render_config={
+            "cache_key": "stephash:0.03:0.05:20.0:materialhash:scriptfingerprint",
+        },
+    )
+
+
+def test_usd_cache_hit_refresh_reason_accepts_binary_usd_without_literal_hartomat_tokens(tmp_path: Path):
+    cad_file = _build_cad_file()
+    usd_asset = _build_usd_asset()
+    usd_path = tmp_path / "bearing_master.usd"
+    usd_path.write_text("#usda 1.0\n", encoding="utf-8")
+
+    refresh_reason = _usd_cache_hit_refresh_reason(cad_file, usd_asset, usd_path)
+
+    assert refresh_reason is None
+
+
+def test_usd_cache_hit_refresh_reason_accepts_current_hartomat_usd(tmp_path: Path):
+    cad_file = _build_cad_file()
+    usd_asset = _build_usd_asset()
+    usd_path = tmp_path / "bearing_master.usd"
+    usd_path.write_text(
+        "hartomat:canonicalMaterialName\nhartomat:partKey\n",
+        encoding="utf-8",
+    )
+
+    refresh_reason = _usd_cache_hit_refresh_reason(cad_file, usd_asset, usd_path)
+
+    assert refresh_reason is None