Initial implementation

test/rss.test.js

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+import assert from "node:assert/strict";
+import test from "node:test";
+import { buildRss, FeedService } from "../src/rss.js";
+import { baseConfig, chapter } from "./helpers.js";
+
+test("buildRss emits valid escaped RSS fields and a stable GUID", () => {
+  const xml = buildRss([chapter], baseConfig.feed, 1700000200000);
+
+  assert.match(xml, /<rss version="2.0"/);
+  assert.match(xml, /Example &amp; Manga — Chapter 12 &amp; a half/);
+  assert.match(xml, /A &lt;Team&gt;/);
+  assert.match(xml, /suwayomi:chapter:42/);
+  assert.match(xml, /x=1&amp;y=2/);
+  assert.match(xml, /atom:link/);
+});
+
+test("FeedService caches responses and coalesces concurrent refreshes", async () => {
+  let calls = 0;
+  let now = 1000;
+  const client = {
+    async recentLibraryChapters(limit) {
+      calls += 1;
+      assert.equal(limit, 25);
+      await Promise.resolve();
+      return [chapter];
+    },
+  };
+  const service = new FeedService(client, baseConfig.feed, () => now);
+
+  const [first, second] = await Promise.all([service.get(), service.get()]);
+  assert.strictEqual(first, second);
+  assert.equal(calls, 1);
+
+  now += 301000;
+  await service.get();
+  assert.equal(calls, 2);
+});