Balance the event-banner night emissive

src/test/tests/test_world.gd

@@ -113,6 +113,13 @@ func test_hollywood_uses_the_real_landmark_layout() -> bool:
 	var banners := root.find_child("EventBanners", true, false)
 	var d := TestUtils.check(banners != null and banners.get_child_count() >= 9,
 		"three red event banners with their trim are present")
+	# The event banners stay readable at night: the cloth carries a warm
+	# self-light that the day/night cycle brightens (not a flat dead panel).
+	var banner_cloth: Material = banners.get_child(0).material_override \
+		if banners != null and banners.get_child_count() > 0 else null
+	var d2 := TestUtils.check(banner_cloth is StandardMaterial3D
+		and (banner_cloth as StandardMaterial3D).emission_enabled,
+		"the event banner cloth is emissive for the night balance")
 	var walk := root.find_child("WalkOfFame", true, false)
 	var walk_band := walk.get_child(0) as MeshInstance3D if walk != null else null
 	var walk_material: Material = walk_band.mesh.surface_get_material(0) if walk_band != null else null
@@ -130,7 +137,7 @@ func test_hollywood_uses_the_real_landmark_layout() -> bool:
 		and WorldBuilder.placement_problems(placements).is_empty(),
 		"the landmark prop placements keep the wide steps clear")
 	root.free()
-	return a and b and c and d and e and f and g and h
+	return a and b and c and d and d2 and e and f and g and h
 
 
 func test_hollywood_geometry_stays_inside_the_map_budget() -> bool: