feat(h5): align third feedback with latest PSD and scanning screen

tools/test_export_psd_assets.py

@@ -0,0 +1,35 @@
+"""The third PSD inserts 扫描 before 登录; never silently use its index."""
+import unittest
+from export_psd_assets import layer_at, ASSET_SPECS
+
+
+class Page(list):
+    def __init__(self, name):
+        super().__init__([["background"], [], [], [], [], [], [], [None, "brand", None, None, None, None, "wechat", "guest"]])
+        self.name = name
+
+
+class LoginMappingTest(unittest.TestCase):
+    def test_old_and_new_layout(self):
+        for index in (9, 10):
+            pages = [Page("other") for _ in range(index)] + [Page("登录")]
+            if index == 10:
+                pages[9].name = "扫描"
+            self.assertEqual(layer_at(pages, "login/0/0"), "background")
+            self.assertEqual(layer_at(pages, "login/7/1"), "brand")
+            self.assertEqual(layer_at(pages, "login/7/6"), "wechat")
+
+    def test_missing_or_ambiguous_login(self):
+        for pages in ([], [Page("扫描")], [Page("登录"), Page("登录")]):
+            with self.assertRaises(ValueError):
+                layer_at(pages, "login/0/0")
+
+    def test_every_login_asset_uses_semantic_mapping(self):
+        names = {"bg-login.jpg", "brand-login.png", "icon-wechat.png", "icon-guest.png"}
+        for filename, key, _ in ASSET_SPECS:
+            if filename in names:
+                self.assertTrue(key.startswith("login/"))
+
+
+if __name__ == "__main__":
+    unittest.main()