feat: layer sqlite e repository posts con test

tests/posts.test.ts

@@ -0,0 +1,74 @@
+import { describe, it, expect, beforeEach } from 'vitest';
+import type Database from 'better-sqlite3';
+import { createDb } from '../src/lib/db';
+import {
+  createPost, updatePost, deletePost, getPostById, getPublishedBySlug,
+  listPublished, listAllPosts, listRecent, listArchiveMonths, type PostInput,
+} from '../src/lib/posts';
+
+let db: Database.Database;
+beforeEach(() => { db = createDb(':memory:'); });
+
+const base: PostInput = {
+  title: 'Titolo', slug: 'titolo', category: 'Contenuti educativi',
+  excerpt: 'estratto', body_html: '<p>corpo</p>', cover: null, draft: false,
+};
+
+describe('posts repository', () => {
+  it('crea e rilegge un post pubblicato', () => {
+    const id = createPost(db, base);
+    const post = getPostById(db, id)!;
+    expect(post.title).toBe('Titolo');
+    expect(post.draft).toBe(0);
+    expect(post.published_at).not.toBeNull();
+  });
+
+  it('bozza non ha published_at e non appare nelle liste pubbliche', () => {
+    const id = createPost(db, { ...base, slug: 'bozza', draft: true });
+    expect(getPostById(db, id)!.published_at).toBeNull();
+    expect(getPublishedBySlug(db, 'bozza')).toBeUndefined();
+    expect(listPublished(db).total).toBe(0);
+    expect(listAllPosts(db)).toHaveLength(1);
+  });
+
+  it('slug duplicato lancia', () => {
+    createPost(db, base);
+    expect(() => createPost(db, base)).toThrow();
+  });
+
+  it('update imposta published_at alla prima pubblicazione e lo conserva', () => {
+    const id = createPost(db, { ...base, draft: true });
+    updatePost(db, id, { ...base, draft: false });
+    const first = getPostById(db, id)!.published_at;
+    expect(first).not.toBeNull();
+    updatePost(db, id, { ...base, title: 'Nuovo', draft: false });
+    expect(getPostById(db, id)!.published_at).toBe(first);
+    expect(getPostById(db, id)!.title).toBe('Nuovo');
+  });
+
+  it('listPublished filtra per categoria e pagina', () => {
+    for (let i = 0; i < 12; i++) {
+      createPost(db, { ...base, slug: `post-${i}`, category: i % 2 ? 'Contenuti educativi' : 'Eventi & Presidi' });
+    }
+    const all = listPublished(db, { page: 1, perPage: 9 });
+    expect(all.total).toBe(12);
+    expect(all.items).toHaveLength(9);
+    const edu = listPublished(db, { category: 'Contenuti educativi' });
+    expect(edu.total).toBe(6);
+  });
+
+  it('delete rimuove', () => {
+    const id = createPost(db, base);
+    deletePost(db, id);
+    expect(getPostById(db, id)).toBeUndefined();
+  });
+
+  it('listRecent e archivio mesi', () => {
+    createPost(db, base);
+    expect(listRecent(db, 4)).toHaveLength(1);
+    const months = listArchiveMonths(db);
+    expect(months).toHaveLength(1);
+    expect(months[0].count).toBe(1);
+    expect(months[0].month).toMatch(/^\d{4}-\d{2}$/);
+  });
+});