Add integration test proving global.data.js output reaches template vars

global.data.js now returns a globalDataSentinel value. feeds.template.js reads
it from vars and includes it as a custom extension field in feed.json. The test
asserts the sentinel appears in the generated feed, which only passes when
globalDataVars are correctly merged into templateGlobalVars.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: bcomnes

test-cases/general-features/index.test.js

@@ -103,6 +103,21 @@ test.describe('general-features', () => {
     const jsChunkFiles = files.filter(f => f.relname.match(/chunks\/js\/chunk-.+\.js$/))
     assert.ok(jsChunkFiles.length > 0, 'at least one shared JS chunk was produced with a hashed name')
 
+    // Verify that global.data.js output reaches template vars
+    const feedJsonPath = path.join(dest, 'feeds/feed.json')
+    try {
+      const feedContent = await readFile(feedJsonPath, 'utf8')
+      const feedData = JSON.parse(feedContent)
+      assert.strictEqual(
+        feedData._globalDataSentinel,
+        'data-from-global-dot-data',
+        'feeds template received globalDataSentinel from global.data.js via vars'
+      )
+    } catch (err) {
+      const error = err instanceof Error ? err : new Error('Unknown error', { cause: err })
+      assert.fail('Failed to verify global.data.js output in template vars: ' + error.message)
+    }
+
     // Special test for global.data.js blogPostsHtml
     const indexPath = path.join(dest, 'index.html')
     try {

test-cases/general-features/src/feeds.template.js

@@ -12,7 +12,8 @@ import jsonfeedToAtom from 'jsonfeed-to-atom'
  *  authorUrl: string,
  *  authorImgUrl: string,
  *  publishDate: string,
- *  siteDescription: string
+ *  siteDescription: string,
+ *  globalDataSentinel: string,
  * }>}
  */
 export default async function * feedsTemplate ({
@@ -23,6 +24,7 @@ export default async function * feedsTemplate ({
     authorUrl,
     authorImgUrl,
     siteDescription,
+    globalDataSentinel,
   },
   pages,
 }) {
@@ -39,6 +41,7 @@ export default async function * feedsTemplate ({
     home_page_url: homePageUrl,
     feed_url: `${homePageUrl}/feed.json`,
     description: siteDescription,
+    _globalDataSentinel: globalDataSentinel,
     author: {
       name: authorName,
       url: authorUrl,

test-cases/general-features/src/global.data.js

@@ -5,7 +5,7 @@
 import { html } from 'htm/preact'
 import { render } from 'preact-render-to-string'
 
-/** @type {AsyncGlobalDataFunction<{ blogPostsHtml: string }>} */
+/** @type {AsyncGlobalDataFunction<{ blogPostsHtml: string, globalDataSentinel: string }>} */
 export default async function ({ pages }) {
   const blogPosts = pages
     .filter(page => page.vars?.layout === 'blog' && page.vars?.publishDate)
@@ -36,5 +36,5 @@ export default async function ({ pages }) {
     </ul>
   `)
 
-  return { blogPostsHtml }
+  return { blogPostsHtml, globalDataSentinel: 'data-from-global-dot-data' }
 }