Handle learning track URL redirects (#21613)

* Handle redirects for learning tracks

* Test for learning track URL redirects

* Test latest Enterprise version

Co-authored-by: Rachael Sewell <rachmari@github.com>

Co-authored-by: Rachael Sewell <rachmari@github.com>

middleware/learning-track.js

@@ -21,7 +21,19 @@ export default async function learningTrack(req, res, next) {
   const currentLearningTrack = { trackName }
 
   const guidePath = getPathWithoutLanguage(getPathWithoutVersion(req.pagePath))
-  const guideIndex = track.guides.findIndex((path) => path === guidePath)
+  let guideIndex = track.guides.findIndex((path) => path === guidePath)
+
+  if (guideIndex < 0) {
+    // Also check if the learning track URL is now a redirect to the requested
+    // page, we still want to render the learning track banner in that case.
+    for (const redirect of req.context.page.redirect_from) {
+      track.guides.forEach((path, i) => {
+        if (path === redirect) {
+          guideIndex = i
+        }
+      })
+    }
+  }
 
   if (guideIndex < 0) return noTrack()
 

tests/rendering/learning-tracks.js

@@ -50,6 +50,18 @@ describe.skip('navigation banner', () => {
     })
   })
 
+  test('render navigation banner when url is a redirect to a learning track URL', async () => {
+    const $ = await getDOM(
+      '/enterprise/admin/enterprise-management/enabling-automatic-update-checks?learn=upgrade_your_instance'
+    )
+    expect($('[data-testid=learning-track-nav]')).toHaveLength(1)
+    const $navLinks = $('[data-testid=learning-track-nav] a')
+    expect($navLinks).toHaveLength(1)
+    $navLinks.each((i, elem) => {
+      expect($(elem).attr('href')).toEqual(expect.stringContaining('?learn=upgrade_your_instance'))
+    })
+  })
+
   test('does not include banner when url does not include `learn` param', async () => {
     const $ = await getDOM(
       '/en/actions/guides/setting-up-continuous-integration-using-workflow-templates'