Turbopack: fix persistent caching test case (#83170)

### What?

The test case was broken and never tested if persistent caching was caching at all

Author: sokra

test/e2e/persistent-caching/my-loader.js

@@ -1,4 +1,5 @@
 module.exports = async function myLoader(source) {
+  console.log('Loader is running!')
   // Make webpack consider the build as large change which makes it persistent cache it sooner
   await new Promise((resolve) => setTimeout(resolve, 2000))
   return source.replace(/Timestamp/g, `Timestamp = ${Date.now()}`)

test/e2e/persistent-caching/next.config.js

@@ -4,10 +4,13 @@
 const nextConfig = {
   turbopack: {
     rules: {
-      'app/page.tsx': {
+      './app/page.tsx': {
         loaders: ['./my-loader.js'],
       },
-      'pages/pages.tsx': {
+      './app/client/page.tsx': {
+        loaders: ['./my-loader.js'],
+      },
+      './pages/pages.tsx': {
         loaders: ['./my-loader.js'],
       },
     },
@@ -17,7 +20,7 @@ const nextConfig = {
   },
   webpack(config) {
     config.module.rules.push({
-      test: /app\/page\.tsx|pages\/pages.tsx/,
+      test: /app\/page\.tsx|app\/client\/page\.tsx|pages\/pages\.tsx/,
       use: ['./my-loader.js'],
     })
 

test/e2e/persistent-caching/persistent-caching.test.ts

@@ -39,16 +39,19 @@ describe('persistent-caching', () => {
     {
       const browser = await next.browser('/')
       appTimestamp = await browser.elementByCss('main').text()
+      expect(appTimestamp).toMatch(/Timestamp = \d+/)
       await browser.close()
     }
     {
       const browser = await next.browser('/client')
       appClientTimestamp = await browser.elementByCss('main').text()
+      expect(appClientTimestamp).toMatch(/Timestamp = \d+/)
       await browser.close()
     }
     {
       const browser = await next.browser('/pages')
       pagesTimestamp = await browser.elementByCss('main').text()
+      expect(pagesTimestamp).toMatch(/Timestamp = \d+/)
       await browser.close()
     }
     await restartCycle()