feat: 添加版本比较和排序功能，优化获取更新快照的逻辑

tests/update-service.test.js

@@ -0,0 +1,173 @@
+const test = require('node:test');
+const assert = require('node:assert/strict');
+const fs = require('node:fs');
+
+const source = fs.readFileSync('sidepanel/update-service.js', 'utf8');
+
+function createUpdateService(options = {}) {
+  const manifest = options.manifest || {
+    version: '2.0',
+    version_name: 'Pro2.0',
+  };
+  const cache = new Map();
+  const windowObject = {};
+  let fetchCalls = 0;
+
+  const localStorage = {
+    getItem(key) {
+      return cache.has(key) ? cache.get(key) : null;
+    },
+    setItem(key, value) {
+      cache.set(key, String(value));
+    },
+  };
+
+  if (options.cachedSnapshot) {
+    cache.set(
+      'multipage-release-snapshot-v1',
+      JSON.stringify(options.cachedSnapshot)
+    );
+  }
+
+  const fetchImpl = options.fetchImpl || (async () => ({
+    ok: true,
+    async json() {
+      return [];
+    },
+  }));
+
+  const wrappedFetch = async (...args) => {
+    fetchCalls += 1;
+    return fetchImpl(...args);
+  };
+
+  const api = new Function(
+    'window',
+    'localStorage',
+    'fetch',
+    'chrome',
+    'AbortController',
+    'setTimeout',
+    'clearTimeout',
+    `${source}; return window.SidepanelUpdateService;`
+  )(
+    windowObject,
+    localStorage,
+    wrappedFetch,
+    {
+      runtime: {
+        getManifest() {
+          return manifest;
+        },
+      },
+    },
+    AbortController,
+    setTimeout,
+    clearTimeout
+  );
+
+  return {
+    api,
+    getFetchCalls() {
+      return fetchCalls;
+    },
+  };
+}
+
+test('getReleaseSnapshot keeps Pro releases ahead of legacy v releases', async () => {
+  const { api } = createUpdateService({
+    manifest: {
+      version: '2.0',
+      version_name: 'Pro2.0',
+    },
+    fetchImpl: async () => ({
+      ok: true,
+      async json() {
+        return [
+          {
+            tag_name: 'v11.0.0',
+            name: 'v11.0.0',
+            html_url: 'https://example.com/v11.0.0',
+            published_at: '2026-04-17T00:00:00.000Z',
+            body: '- legacy release',
+            draft: false,
+            prerelease: false,
+          },
+          {
+            tag_name: 'Pro2.4',
+            name: 'Pro2.4',
+            html_url: 'https://example.com/Pro2.4',
+            published_at: '2026-04-18T00:00:00.000Z',
+            body: '- pro release',
+            draft: false,
+            prerelease: false,
+          },
+          {
+            tag_name: 'Pro2.0',
+            name: 'Pro2.0',
+            html_url: 'https://example.com/Pro2.0',
+            published_at: '2026-04-16T00:00:00.000Z',
+            body: '- current release',
+            draft: false,
+            prerelease: false,
+          },
+        ];
+      },
+    }),
+  });
+
+  const snapshot = await api.getReleaseSnapshot({ force: true });
+
+  assert.equal(snapshot.status, 'update-available');
+  assert.equal(snapshot.localVersion, 'Pro2.0');
+  assert.equal(snapshot.latestVersion, 'Pro2.4');
+  assert.deepEqual(
+    snapshot.newerReleases.map((release) => release.displayVersion),
+    ['Pro2.4']
+  );
+});
+
+test('getReleaseSnapshot reorders cached releases before choosing latest version', async () => {
+  const { api, getFetchCalls } = createUpdateService({
+    manifest: {
+      version: '2.0',
+      version_name: 'Pro2.0',
+    },
+    cachedSnapshot: {
+      fetchedAt: Date.now(),
+      releases: [
+        {
+          version: '11.0.0',
+          displayVersion: 'v11.0.0',
+          family: 'legacy',
+          title: '',
+          url: 'https://example.com/v11.0.0',
+          publishedAt: '2026-04-17T00:00:00.000Z',
+          notes: [],
+        },
+        {
+          version: '2.4',
+          displayVersion: 'Pro2.4',
+          family: 'pro',
+          title: '',
+          url: 'https://example.com/Pro2.4',
+          publishedAt: '2026-04-18T00:00:00.000Z',
+          notes: [],
+        },
+      ],
+    },
+    fetchImpl: async () => {
+      throw new Error('should not fetch when cache is fresh');
+    },
+  });
+
+  const snapshot = await api.getReleaseSnapshot();
+
+  assert.equal(getFetchCalls(), 0);
+  assert.equal(snapshot.status, 'update-available');
+  assert.equal(snapshot.latestVersion, 'Pro2.4');
+  assert.deepEqual(
+    snapshot.newerReleases.map((release) => release.displayVersion),
+    ['Pro2.4']
+  );
+});