migration: preserve frontend shell pages and styles

app/tests/test_preservation_slice_screener.py

@@ -11,6 +11,12 @@ import screener
 import strategy_tracking
 from backend.features.screener import compiler, engine, strategies, tracking
 from backend.features.screener import service as screener_service
+from tests.preservation_helpers import (
+    ORIGINAL_STATIC,
+    assert_moved_asset_matches,
+    assert_page_prefix_matches,
+    reassembled_frontend_runtime,
+)
 
 
 APP_ROOT = Path(__file__).resolve().parents[1]
@@ -182,17 +188,12 @@ class ScreenerSliceSourceEquivalenceTests(unittest.TestCase):
         )
 
     def test_screener_frontend_assets_are_unchanged(self) -> None:
-        for relative in (
-            "static/index.html",
-            "static/app.js",
-            "static/styles.css",
-            "static/pages/screener/page.js",
-        ):
-            self.assertEqual(
-                sha256(APP_ROOT / relative),
-                sha256(ORIGINAL_ROOT / relative),
-                relative,
-            )
+        self.assertEqual(
+            reassembled_frontend_runtime(),
+            (ORIGINAL_STATIC / "app.js").read_text(encoding="utf-8"),
+        )
+        assert_moved_asset_matches(self, "styles.css", "styles/styles.css")
+        assert_page_prefix_matches(self, "pages/screener/page.js")
 
 
 if __name__ == "__main__":