fix: 售罄临时页仅下拉刷新一次 (#265)

client/test/test_pdd_collect_service.py

@@ -93,6 +93,29 @@ class FakeCollectDevice:
         self.swipe_panel_states.append(self.panel_open)
 
 
+class SoldOutRefreshCollectDevice(FakeCollectDevice):
+    """模拟深链先显示售罄，向下拉一次后恢复或继续售罄。"""
+
+    def __init__(self, sold_out_xml, recovered_xml, *, persistent=False):
+        super().__init__(recovered_xml, "")
+        self.sold_out_xml = sold_out_xml
+        self.recovered_xml = recovered_xml
+        self.persistent = persistent
+        self.refreshed = False
+
+    def dump_hierarchy(self):
+        if self.opened_url is None:
+            return '<hierarchy><node package="com.xunmeng.pinduoduo" /></hierarchy>'
+        if not self.refreshed or self.persistent:
+            return self.sold_out_xml
+        return self.recovered_xml
+
+    def swipe(self, x1, y1, x2, y2, duration=0.0):
+        self.swipes.append(((x1, y1, x2, y2), {"duration": duration}))
+        if y2 > y1 and x1 == x2:
+            self.refreshed = True
+
+
 class GoodsMetadataScrollDevice(FakeCollectDevice):
     """模拟评价和店铺分别出现在商品页后续屏幕。"""
 
@@ -1764,6 +1787,59 @@ class PddCollectParserTest(unittest.TestCase):
             )
         self.assertEqual(raised.exception.code, "PDD_PAGE_TIMEOUT")
 
+    def test_sold_out_page_pulls_down_once_then_recovers_goods(self):
+        device = SoldOutRefreshCollectDevice(
+            self.sold_out_xml,
+            self.home_xml,
+        )
+        service = PddCollectService(
+            PddDeviceService(lambda _serial: device),
+            "USB-001",
+            "client-001",
+            sleeper=lambda _seconds: None,
+        )
+
+        service._open_goods(
+            device,
+            "https://mobile.yangkeduo.com/goods.html?goods_id=123",
+            {"package": "com.xunmeng.pinduoduo"},
+        )
+
+        self.assertEqual(len(device.swipes), 1)
+        (x1, y1, x2, y2), options = device.swipes[0]
+        self.assertEqual(x1, x2)
+        self.assertGreater(y2, y1)
+        self.assertEqual(options["duration"], 0.5)
+        self.assertEqual(device.clicks, [])
+
+    def test_sold_out_after_one_refresh_is_unavailable(self):
+        device = SoldOutRefreshCollectDevice(
+            self.sold_out_xml,
+            self.home_xml,
+            persistent=True,
+        )
+        service = PddCollectService(
+            PddDeviceService(lambda _serial: device),
+            "USB-001",
+            "client-001",
+            sleeper=lambda _seconds: None,
+        )
+
+        with self.assertRaises(PddCollectError) as raised:
+            service._open_goods(
+                device,
+                "https://mobile.yangkeduo.com/goods.html?goods_id=123",
+                {"package": "com.xunmeng.pinduoduo"},
+            )
+
+        self.assertEqual(raised.exception.code, "PDD_GOODS_UNAVAILABLE")
+        self.assertEqual(
+            raised.exception.diagnostics,
+            {"page_reason": "out_of_stock", "refresh_attempts": 1},
+        )
+        self.assertEqual(len(device.swipes), 1)
+        self.assertEqual(device.clicks, [])
+
     def test_stable_home_reopens_once_then_stops_before_spec_click(self):
         home = (FIXTURES / "pdd_home_page.xml").read_text(encoding="utf-8")
         device = FakeCollectDevice(home, self.spec_xml)