feat(smartfeed): Implement Smartfeed core: add feed validation, parsing, exporting and comprehensive tests

test/test.export.node+bun+deno.ts

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+import { expect, tap } from '@git.zone/tstest/tapbundle';
+import * as smartfeed from '../ts/index.js';
+
+let testSmartFeed: smartfeed.Smartfeed;
+let testFeed: smartfeed.Feed;
+
+tap.test('setup', async () => {
+  testSmartFeed = new smartfeed.Smartfeed();
+  testFeed = testSmartFeed.createFeed({
+    domain: 'central.eu',
+    title: 'central.eu - ideas for Europe',
+    category: 'Politics',
+    company: 'Lossless GmbH',
+    companyDomain: 'https://lossless.com',
+    companyEmail: 'hello@lossless.com',
+    description: 'ideas for Europe',
+  });
+
+  testFeed.addItem({
+    title: 'A better European Union',
+    authorName: 'Phil',
+    imageUrl: 'https://central.eu/someimage.png',
+    timestamp: Date.now(),
+    url: 'https://central.eu/article/somearticle',
+    content: 'somecontent',
+  });
+});
+
+tap.test('should export RSS 2.0 feed', async () => {
+  const rssFeed = testFeed.exportRssFeedString();
+
+  expect(rssFeed).toInclude('<?xml version="1.0" encoding="utf-8"?>');
+  expect(rssFeed).toInclude('<rss version="2.0"');
+  expect(rssFeed).toInclude('<title>central.eu - ideas for Europe</title>');
+  expect(rssFeed).toInclude('<link>https://central.eu</link>');
+  expect(rssFeed).toInclude('<description>ideas for Europe</description>');
+  expect(rssFeed).toInclude('<generator>@push.rocks/smartfeed</generator>');
+  expect(rssFeed).toInclude('<category>Politics</category>');
+  expect(rssFeed).toInclude('<item>');
+  expect(rssFeed).toInclude('A better European Union');
+});
+
+tap.test('should export Atom 1.0 feed', async () => {
+  const atomFeed = testFeed.exportAtomFeed();
+
+  expect(atomFeed).toInclude('<?xml version="1.0" encoding="utf-8"?>');
+  expect(atomFeed).toInclude('<feed xmlns="http://www.w3.org/2005/Atom">');
+  expect(atomFeed).toInclude('<title>central.eu - ideas for Europe</title>');
+  expect(atomFeed).toInclude('<subtitle>ideas for Europe</subtitle>');
+  expect(atomFeed).toInclude('<generator>@push.rocks/smartfeed</generator>');
+  expect(atomFeed).toInclude('<entry>');
+  expect(atomFeed).toInclude('A better European Union');
+});
+
+tap.test('should export JSON Feed 1.0', async () => {
+  const jsonFeedString = testFeed.exportJsonFeed();
+  const jsonFeed = JSON.parse(jsonFeedString);
+
+  expect(jsonFeed.version).toEqual('https://jsonfeed.org/version/1');
+  expect(jsonFeed.title).toEqual('central.eu - ideas for Europe');
+  expect(jsonFeed.home_page_url).toEqual('https://central.eu');
+  expect(jsonFeed.description).toEqual('ideas for Europe');
+  expect(jsonFeed.items).toBeArray();
+  expect(jsonFeed.items.length).toEqual(1);
+  expect(jsonFeed.items[0].title).toEqual('A better European Union');
+});
+
+tap.test('should include correct item data in RSS', async () => {
+  const rssFeed = testFeed.exportRssFeedString();
+
+  expect(rssFeed).toInclude('https://central.eu/article/somearticle');
+  expect(rssFeed).toInclude('https://central.eu/someimage.png');
+  expect(rssFeed).toInclude('somecontent');
+  expect(rssFeed).toInclude('<enclosure');
+});
+
+tap.test('should include correct author information', async () => {
+  const rssFeed = testFeed.exportRssFeedString();
+  const atomFeed = testFeed.exportAtomFeed();
+
+  // RSS doesn't always include dc:creator, but Atom should have author
+  expect(atomFeed).toInclude('<name>Phil</name>');
+});
+
+tap.test('should handle multiple items in export', async () => {
+  const feed = testSmartFeed.createFeed({
+    domain: 'multi.example.com',
+    title: 'Multi-item Feed',
+    category: 'Test',
+    company: 'Test Inc',
+    companyDomain: 'https://example.com',
+    companyEmail: 'test@example.com',
+    description: 'Testing multiple items',
+  });
+
+  for (let i = 1; i <= 5; i++) {
+    feed.addItem({
+      title: `Article ${i}`,
+      authorName: 'Author',
+      imageUrl: `https://example.com/image${i}.png`,
+      timestamp: Date.now() + i,
+      url: `https://example.com/article/${i}`,
+      content: `Content for article ${i}`,
+    });
+  }
+
+  const rssFeed = feed.exportRssFeedString();
+  const jsonFeedString = feed.exportJsonFeed();
+  const jsonFeed = JSON.parse(jsonFeedString);
+
+  expect(jsonFeed.items.length).toEqual(5);
+  expect(rssFeed).toInclude('Article 1');
+  expect(rssFeed).toInclude('Article 5');
+});
+
+tap.test('should export feed with custom item IDs', async () => {
+  const feed = testSmartFeed.createFeed({
+    domain: 'example.com',
+    title: 'Custom ID Feed',
+    category: 'Test',
+    company: 'Test Inc',
+    companyDomain: 'https://example.com',
+    companyEmail: 'test@example.com',
+    description: 'Testing custom IDs',
+  });
+
+  feed.addItem({
+    title: 'Article with custom ID',
+    authorName: 'Author',
+    imageUrl: 'https://example.com/image.png',
+    timestamp: Date.now(),
+    url: 'https://example.com/article/custom',
+    content: 'Content',
+    id: 'custom-uuid-123',
+  });
+
+  const rssFeed = feed.exportRssFeedString();
+  expect(rssFeed).toInclude('custom-uuid-123');
+});
+
+export default tap.start();