feat: 安全应用采购规格解析结果 (#257)

client/test/test_pdd_u2_purchase_adapter.py

@@ -11,6 +11,8 @@ from src.pdd_collect_service import DimensionValue, PddCollectError, SpecDimensi
 from src.pdd_purchase_adapter import (
     PddPurchaseError,
     PddPurchaseSpecResolutionRequired,
+    PurchaseSizeObservation,
+    PurchaseSpecCandidateSnapshot,
 )
 from src.performance_timing import TaskPerformanceTrace
 from src.pdd_u2_purchase_adapter import (
@@ -991,6 +993,76 @@ class U2PddPurchaseAdapterTest(unittest.TestCase):
         )
         adapter.close()
 
+    def test_apply_resolved_size_rechecks_same_snapshot_before_exact_selection(self):
+        device = FakeDevice()
+        selected = []
+        snapshot = PurchaseSpecCandidateSnapshot.build(
+            goods_id="753136429979",
+            selected_color="黑色",
+            target_size="XXL",
+            dimension_name="尺码",
+            observations=(
+                PurchaseSizeObservation("3XL【140-165斤】", True),
+            ),
+            observed_at="2026-08-17T08:00:00Z",
+        )
+        adapter = U2PddPurchaseAdapter(
+            "USB-001",
+            device_service=PddDeviceService(connector=lambda _serial: device),
+            sleeper=lambda _seconds: None,
+            select_size_fn=lambda _device, _xml, target, **_kwargs: (
+                selected.append(target) or True
+            ),
+            size_candidate_collector=lambda _device: SpecDimension(
+                "size",
+                "尺码",
+                (DimensionValue("3XL【140-165斤】", True),),
+            ),
+        )
+        adapter.open_goods(GOODS_URL)
+        device.click(790, 2214)
+
+        adapter.apply_resolved_size(snapshot, snapshot.candidates[0])
+
+        self.assertEqual(selected, ["3XL【140-165斤】"])
+        self.assertEqual(
+            adapter.read_state().selected_options,
+            {"size": "3XL【140-165斤】"},
+        )
+        adapter.close()
+
+    def test_apply_resolved_size_stops_when_candidate_snapshot_changed(self):
+        device = FakeDevice()
+        selections = []
+        snapshot = PurchaseSpecCandidateSnapshot.build(
+            goods_id="753136429979",
+            selected_color="黑色",
+            target_size="XXL",
+            dimension_name="尺码",
+            observations=(PurchaseSizeObservation("M", True),),
+            observed_at="2026-08-17T08:00:00Z",
+        )
+        adapter = U2PddPurchaseAdapter(
+            "USB-001",
+            device_service=PddDeviceService(connector=lambda _serial: device),
+            sleeper=lambda _seconds: None,
+            select_size_fn=lambda *_args, **_kwargs: selections.append(True),
+            size_candidate_collector=lambda _device: SpecDimension(
+                "size", "尺码", (DimensionValue("L", True),)
+            ),
+        )
+        adapter.open_goods(GOODS_URL)
+        device.click(790, 2214)
+
+        with self.assertRaises(PddPurchaseError) as raised:
+            adapter.apply_resolved_size(snapshot, snapshot.candidates[0])
+
+        self.assertEqual(
+            raised.exception.code, "PURCHASE_SPEC_CANDIDATES_CHANGED"
+        )
+        self.assertEqual(selections, [])
+        adapter.close()
+
     def test_candidate_snapshot_is_not_used_when_target_exists_but_click_fails(self):
         device = FakeDevice()
         adapter = U2PddPurchaseAdapter(