fix: 售罄临时页仅下拉刷新一次 (#265)

client/test/test_pdd_u2_purchase_adapter.py

@@ -234,6 +234,29 @@ class FakeDevice:
         raise AssertionError(f"未预期的 selector: {selector}")
 
 
+class SoldOutRefreshPurchaseDevice(FakeDevice):
+    """模拟采购深链先显示售罄，下拉一次后恢复或继续售罄。"""
+
+    def __init__(self, sold_out_xml: str, *, persistent: bool = False) -> None:
+        super().__init__(sold_out_xml)
+        self.sold_out_xml = sold_out_xml
+        self.persistent = persistent
+        self.refreshed = False
+        self.swipes = []
+
+    def dump_hierarchy(self):
+        if not self.has_opened:
+            return '<hierarchy><node package="com.xunmeng.pinduoduo" /></hierarchy>'
+        if not self.refreshed or self.persistent:
+            return self.sold_out_xml
+        return home_xml()
+
+    def swipe(self, x1, y1, x2, y2, duration=0.0):
+        self.swipes.append((x1, y1, x2, y2, duration))
+        if y2 > y1 and x1 == x2:
+            self.refreshed = True
+
+
 class VerticallyScrolledColorPanelDevice(FakeDevice):
     """模拟 PDD 记住规格面板纵向位置。"""
 
@@ -2143,6 +2166,46 @@ class U2PddPurchaseAdapterTest(unittest.TestCase):
         self.assertEqual(raised.exception.code, "PDD_PAGE_CAPTCHA")
         self.assertEqual(device.clicks, [])
 
+    def test_sold_out_page_pulls_down_once_then_recovers_goods(self):
+        sold_out_xml = (
+            FIXTURES / "pdd_sold_out_recommendations.xml"
+        ).read_text(encoding="utf-8")
+        device = SoldOutRefreshPurchaseDevice(sold_out_xml)
+        adapter = self._adapter(device, [])
+
+        adapter.open_goods(GOODS_URL)
+
+        self.assertEqual(len(device.swipes), 1)
+        x1, y1, x2, y2, duration = device.swipes[0]
+        self.assertEqual(x1, x2)
+        self.assertGreater(y2, y1)
+        self.assertEqual(duration, 0.5)
+        self.assertEqual(device.clicks, [])
+        adapter.close()
+
+    def test_sold_out_after_one_refresh_is_unavailable(self):
+        sold_out_xml = (
+            FIXTURES / "pdd_sold_out_recommendations.xml"
+        ).read_text(encoding="utf-8")
+        device = SoldOutRefreshPurchaseDevice(
+            sold_out_xml,
+            persistent=True,
+        )
+        adapter = self._adapter(device, [])
+
+        with self.assertRaises(PddPurchaseError) as raised:
+            adapter.open_goods(GOODS_URL)
+
+        self.assertEqual(raised.exception.code, "PDD_GOODS_UNAVAILABLE")
+        self.assertFalse(raised.exception.retryable)
+        self.assertEqual(
+            raised.exception.diagnostics,
+            {"page_reason": "out_of_stock", "refresh_attempts": 1},
+        )
+        self.assertEqual(len(device.swipes), 1)
+        self.assertEqual(device.clicks, [])
+        adapter.close()
+
     def test_stable_home_reopens_once_then_stops_before_click(self):
         device = FakeDevice(
             (FIXTURES / "pdd_home_page.xml").read_text(encoding="utf-8")