test: add page hierarchy cycle integration harness

apps/server/test/page-hierarchy-cycle.integration-spec.ts

@@ -0,0 +1,21 @@
+import { db } from './support/database';
+import { seedAcyclicPageChain } from './support/page-hierarchy-fixtures';
+
+describe('page hierarchy cycle integration harness', () => {
+  it('inserts and reads an acyclic page chain through the test Kysely instance', async () => {
+    const { root, child, grandchild } = await seedAcyclicPageChain();
+
+    const pages = await db
+      .selectFrom('pages')
+      .select(['id', 'parentPageId', 'title'])
+      .where('id', 'in', [root.id, child.id, grandchild.id])
+      .orderBy('title')
+      .execute();
+
+    expect(pages).toEqual([
+      { id: child.id, parentPageId: root.id, title: 'Child' },
+      { id: grandchild.id, parentPageId: child.id, title: 'Grandchild' },
+      { id: root.id, parentPageId: null, title: 'Root' },
+    ]);
+  });
+});