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backend/tests/test_db_inventory_id.py

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+"""出入库单 id 生成单元测试"""
+from unittest.mock import MagicMock
+
+from app.services.db.inventory_id import max_numeric_inbound_outbound_id
+
+
+def test_max_numeric_inbound_outbound_id_parses_scalar():
+    db = MagicMock()
+    db.execute.return_value.scalar.return_value = 1094
+    assert max_numeric_inbound_outbound_id(db, "shanxia2.0") == 1094
+    db.execute.assert_called_once()
+
+
+def test_max_numeric_inbound_outbound_id_empty():
+    db = MagicMock()
+    db.execute.return_value.scalar.return_value = None
+    assert max_numeric_inbound_outbound_id(db, "shanxia2.0") == 0