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backend/tests/test_presign_order_date_validation.py

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+"""预签约日期不应到数据库 CHAR(8) 字段才失败。"""
+import pytest
+from pydantic import ValidationError
+
+from app.api.presign_order import PresignOrderBody
+
+
+@pytest.mark.parametrize('field', ['orderDate', 'expectedDeliveryDate'])
+@pytest.mark.parametrize('value', ['2026-10-15', '2026101', '20261301', '20260230', 'abcdefgh'])
+def test_invalid_presign_date_rejected_before_database(field, value):
+    with pytest.raises(ValidationError):
+        PresignOrderBody(**{field: value})
+
+
+@pytest.mark.parametrize('field', ['orderDate', 'expectedDeliveryDate'])
+@pytest.mark.parametrize('value', ['20261015', '20240229', '', None])
+def test_valid_or_empty_presign_date_keeps_existing_contract(field, value):
+    body = PresignOrderBody(**{field: value})
+    assert body.model_dump(by_alias=True)[field] == value