修复：补充发货草稿当前余量

shierfeng-fastapi-backend/tests/module_business/test_shipment_service.py

@@ -10,6 +10,7 @@ from unittest.mock import AsyncMock, MagicMock, patch
 
 from fastapi import FastAPI
 from fastapi.routing import APIRoute
+from sqlalchemy.dialects import postgresql
 from sqlalchemy.exc import IntegrityError
 from sqlalchemy.ext.asyncio import AsyncSession
 
@@ -251,6 +252,49 @@ class ShipmentInfrastructureContractTest(unittest.TestCase):
                 self.assertIs(False, parameter.default)
 
 
+class ShipmentDetailDaoTest(unittest.IsolatedAsyncioTestCase):
+    async def test_detail_loads_each_current_remaining_quantity_with_one_left_join(self) -> None:
+        db = MagicMock(spec=AsyncSession)
+        shipment = make_shipment(pallet_ids=(5, 2, 8))
+        order_result = MagicMock()
+        order_result.scalar_one_or_none.return_value = shipment
+        item_result = MagicMock()
+        item_result.all.return_value = [
+            (shipment.items[0], 13),
+            (shipment.items[1], 6),
+            (shipment.items[2], None),
+        ]
+        db.execute.side_effect = [order_result, item_result]
+
+        actual = await OperationDao.get_shipment_by_id(
+            db,
+            12,
+            warehouse_ids=[7],
+            site_ids=[9],
+        )
+
+        self.assertIs(shipment, actual)
+        self.assertEqual(2, db.execute.await_count)
+        self.assertEqual([13, 6, None], [item.remaining_packages for item in shipment.items])
+        self.assertEqual([None, None, None], [item.package_qty for item in shipment.items])
+        item_statement = db.execute.await_args_list[1].args[0]
+        item_sql = ' '.join(
+            str(
+                item_statement.compile(
+                    dialect=postgresql.dialect(),
+                    compile_kwargs={'literal_binds': True},
+                )
+            ).split()
+        )
+        self.assertIn(
+            'LEFT OUTER JOIN biz_pallet_inventory '
+            'ON biz_pallet_inventory.pallet_id = biz_shipment_item.pallet_id',
+            item_sql,
+        )
+        self.assertIn('WHERE biz_shipment_item.shipment_id = 12', item_sql)
+        self.assertIn('ORDER BY biz_shipment_item.shipment_item_id', item_sql)
+
+
 class ShipmentControllerBootstrapTest(unittest.TestCase):
     def test_shipment_controller_module_exists(self) -> None:
         spec = importlib.util.find_spec('module_business.controller.shipment_controller')