Add product-area presentation to Views

tests/test_views.py

@@ -20,6 +20,7 @@ from govoplan_views.backend.service import (
     create_revision,
     get_revision,
     list_definitions,
+    normalize_view_presentation,
     normalize_visible_surface_ids,
     publish_revision,
     resolve_effective_view,
@@ -193,6 +194,70 @@ class ViewsServiceTests(unittest.TestCase):
         self.session.close()
         self.engine.dispose()
 
+    def test_view_presentation_is_normalized_and_versioned(self) -> None:
+        definition = create_definition(
+            self.session,
+            tenant_id="tenant-1",
+            scope_type="tenant",
+            scope_id=None,
+            definition_key=None,
+            name="Product navigation",
+            description=None,
+            visible_surface_ids=ordinary_surface_ids(),
+            catalogue=self.catalogue,
+            actor_id="account-admin",
+            presentation={
+                "navigation_mode": "grouped",
+                "product_area_order": ["work", "records-documents"],
+                "product_area_labels": {"work": "My work"},
+            },
+            available_product_area_ids=("work", "records-documents"),
+        )
+        revision = get_revision(self.session, definition_id=definition.id)
+        self.assertEqual("grouped", revision.presentation["navigation_mode"])
+        compatible_revision = create_revision(
+            self.session,
+            definition,
+            visible_surface_ids=lockout_safe_surface_ids(),
+            catalogue=self.catalogue,
+            actor_id="legacy-client",
+            available_product_area_ids=("work", "records-documents"),
+        )
+        self.assertEqual(
+            revision.presentation,
+            compatible_revision.presentation,
+            "omitting presentation must preserve the previous revision contract",
+        )
+        revision = compatible_revision
+        publish_revision(
+            self.session,
+            definition,
+            revision,
+            catalogue=self.catalogue,
+            actor_id="account-admin",
+        )
+        self.assign(
+            definition,
+            scope_type="tenant",
+            scope_id=None,
+        )
+        state = resolve_effective_view(
+            self.session,
+            tenant_id="tenant-1",
+            account_id="account-1",
+            catalogue=self.catalogue,
+        )
+        self.assertEqual("My work", state.effective.presentation["product_area_labels"]["work"])
+
+    def test_view_presentation_rejects_unknown_or_unavailable_fields(self) -> None:
+        with self.assertRaises(ViewsValidationError):
+            normalize_view_presentation({"unknown": True})
+        with self.assertRaises(ViewsValidationError):
+            normalize_view_presentation(
+                {"product_area_order": ["unavailable"]},
+                available_product_area_ids=("work",),
+            )
+
     def create_published_definition(
         self,
         *,