Material number as a first-class spool field (#2994)

backend/tests/unit/test_github_backup_spool_fields.py

@@ -0,0 +1,47 @@
+"""The spool collector's field whitelist for Git backup (#2870).
+
+``_collect_spools`` builds an explicit dict per spool, so anything missing
+from it is silently absent from the backup and therefore lost on restore.
+The owner's own bookkeeping — purchasing number (#2870), category and
+low-stock override (#729), free-text storage — belongs in the file.
+"""
+
+import pytest
+
+from backend.app.models.spool import Spool
+from backend.app.services.github_backup import GitHubBackupService
+
+
+@pytest.mark.asyncio
+async def test_collects_the_owners_own_bookkeeping_fields(db_session):
+    db_session.add(
+        Spool(
+            material="PLA",
+            material_number="15",
+            category="Production",
+            low_stock_threshold_pct=40,
+            storage_location="Shelf B",
+        )
+    )
+    await db_session.commit()
+
+    files: dict = {}
+    await GitHubBackupService()._collect_spools(db_session, files)
+
+    entry = files["spools/inventory.json"]["spools"][0]
+    assert entry["material_number"] == "15"
+    assert entry["category"] == "Production"
+    assert entry["low_stock_threshold_pct"] == 40
+    assert entry["storage_location"] == "Shelf B"
+
+
+@pytest.mark.asyncio
+async def test_location_id_is_left_out(db_session):
+    """The locations table is not backed up, so the ID has nothing to mean."""
+    db_session.add(Spool(material="PLA"))
+    await db_session.commit()
+
+    files: dict = {}
+    await GitHubBackupService()._collect_spools(db_session, files)
+
+    assert "location_id" not in files["spools/inventory.json"]["spools"][0]