Add a test for the WIP language banner link change (#17480)

* Add a test

* Try adding de

* Let's try all languages

package.json

@@ -161,7 +161,7 @@
     "test": "jest && eslint . && prettier -c \"**/*.{yml,yaml}\" && npm run check-deps",
     "prebrowser-test": "npm run build",
     "browser-test": "start-server-and-test browser-test-server 4001 browser-test-tests",
-    "browser-test-server": "cross-env NODE_ENV=production ENABLED_LANGUAGES='en,ja' PORT=4001 node server.js",
+    "browser-test-server": "cross-env NODE_ENV=production PORT=4001 node server.js",
     "browser-test-tests": "cross-env BROWSER=1 jest tests/browser/browser.js",
     "sync-search": "start-server-and-test sync-search-server 4002 sync-search-indices",
     "sync-search-dry-run": "DRY_RUN=1 npm run sync-search",

tests/browser/browser.js

@@ -1,6 +1,7 @@
 /* global page, browser */
 const sleep = require('await-sleep')
 const { latest } = require('../../lib/enterprise-server-releases')
+const languages = require('../../lib/languages')
 
 describe('homepage', () => {
   jest.setTimeout(60 * 1000)
@@ -264,3 +265,19 @@ describe('card filters', () => {
     expect(noResultsClasses).not.toContain('d-none')
   })
 })
+
+describe('language banner', () => {
+  it('directs user to the English version of the article', async () => {
+    const wipLanguageKey = Object.keys(languages).find(key => languages[key].wip)
+
+    // This kinda sucks, but if we don't have a WIP language, we currently can't
+    // run a reliable test. But hey, on the bright side, if we don't have a WIP
+    // language then this code will never run anyway!
+    if (wipLanguageKey) {
+      const res = await page.goto(`http://localhost:4001/${wipLanguageKey}/actions`)
+      expect(res.ok()).toBe(true)
+      const href = await page.$eval('a#to-english-doc', el => el.href)
+      expect(href.endsWith('/en/actions')).toBe(true)
+    }
+  })
+})