test(deps): replace Zombie by Puppeteer

.eslintrc.js

@@ -83,6 +83,13 @@ module.exports = {
             "rules": {
                 "quotes": ["error", "double"],
             },
+        },
+        {
+            "files": ["test/functional.js"],
+            "globals": {
+                // For Puppeteer when calling "page.evaluate()"
+                "document": "readonly",
+            },
         }
     ],
 };

.github/workflows/lint.yaml

@@ -5,7 +5,10 @@ jobs:
     eslint:
         name: ESLint
         runs-on: ubuntu-latest
-
+        env:
+            # We don't want Puppeteer to automatically download a browser when dependencies are being installed
+            PUPPETEER_SKIP_DOWNLOAD: 'true'
+
         steps:
             -   name: Checkout
                 uses: actions/checkout@v4

.github/workflows/testing_apps.yml

@@ -84,7 +84,10 @@ jobs:
 
     name: ${{ matrix.app.name }}
     runs-on: ubuntu-latest
-
+    env:
+      # We don't want Puppeteer to automatically download a browser when dependencies are being installed
+      PUPPETEER_SKIP_DOWNLOAD: 'true'
+
     steps:
       -   name: Checkout
           uses: actions/checkout@v4

package.json

@@ -82,6 +82,7 @@
     "postcss-loader": "^7.0.0 || ^8.1.0",
     "preact": "^10.5.0",
     "preact-compat": "^3.17.0",
+    "puppeteer": "^23.2.2",
     "sass": "^1.17.0",
     "sass-loader": "^16.0.1",
     "sinon": "^14.0.0",
@@ -96,8 +97,7 @@
     "vue-loader": "^17.0.0",
     "webpack": "^5.72",
     "webpack-cli": "^5.1.4",
-    "webpack-notifier": "^1.15.0",
-    "zombie": "^6.1.4"
+    "webpack-notifier": "^1.15.0"
   },
   "peerDependencies": {
     "@babel/core": "^7.17.0",

test/helpers/assert.js

@@ -176,21 +176,29 @@ class Assert {
 
     /**
      *
-     * @param {import('zombie')} browser
+     * @param {Array<{ response: import('puppeteer').HTTPResponse}>} loadedResources
      * @param {Array}   expectedResourcePaths Array of expected resources, but just
      *                  their short filenames - e.g. main.css
      *                  (i.e. without the public path)
      * @returns {void}
      */
-    assertResourcesLoadedCorrectly(browser, expectedResourcePaths) {
+    assertResourcesLoadedCorrectly(loadedResources, expectedResourcePaths) {
         const actualResources = [];
-        for (let resource of browser.resources) {
+
+        for (let resource of loadedResources) {
+            const url = resource.response.url();
+
             // skip the .html page as a resource
-            if (resource.request.url.includes('testing.html')) {
+            if (url.includes('testing.html')) {
+                continue;
+            }
+
+            // skip the favicon as a resource
+            if (url.includes('favicon.ico')) {
                 continue;
             }
 
-            actualResources.push(resource.request.url);
+            actualResources.push(url);
         }
 
         // prefix each expected resource with its public path

test/helpers/setup.js

@@ -14,7 +14,6 @@ const WebpackConfig = require('../../lib/WebpackConfig');
 const parseRuntime = require('../../lib/config/parse-runtime');
 const webpack = require('webpack');
 const fs = require('fs-extra');
-const Browser = require('zombie');
 const httpServer = require('http-server');
 const configGenerator = require('../../lib/config-generator');
 const validator = require('../../lib/config/validator');
@@ -142,18 +141,22 @@ function stopAllServers() {
  * makes a request to it, and executes a callback, passing that
  * the Browser instance used to make the request.
  *
+ * @param {import('puppeteer').Browser} browser Puppeteer browser instance
  * @param {string} webRootDir Directory path (e.g. /path/to/public) where the web server should be rooted
  * @param {Array} scriptSrcs  Used to create <script src=""> tags.
- * @param {Function} callback Called after the page was requested.
+ * @param {function({
+ *      page: import('puppeteer').Page,
+ *      loadedResources: Array<{ response: import('puppeteer').HTTPResponse }>}
+ * ): void} callback Called after the page was requested.
  * @returns {void}
  */
-function requestTestPage(webRootDir, scriptSrcs, callback) {
+async function requestTestPage(browser, webRootDir, scriptSrcs, callback) {
     var scripts = '';
     for (let scriptSrc of scriptSrcs) {
         scripts += `<script src="${scriptSrc}"></script>`;
     }
 
-    const testHtml = `
+    const testHtml = `<!DOCTYPE html>
 <html>
 <head>
 </head>
@@ -175,23 +178,31 @@ function requestTestPage(webRootDir, scriptSrcs, callback) {
     // start a secondary server - can be used as the "CDN"
     startHttpServer('8090', webRootDir);
 
-    const browser = new Browser();
-    browser.silent = true;
-    browser.on('error', function(error) {
-        throw new Error(`Error when running the browser: ${error}`);
+    const loadedResources = [];
+
+    const context = await browser.createBrowserContext();
+    const page = await context.newPage();
+
+    page.on('error', (error) => {
+        throw new Error(`Error when running the browser: "${error.message}".`, { cause: error });
     });
-    browser.visit('http://127.0.0.1:8080/testing.html', () => {
-        stopAllServers();
 
-        // sanity check for failed asset loading
-        for (let resource of browser.resources) {
-            if (resource.response.status !== 200) {
-                throw new Error(`Error: status code ${resource.response.status} when requesting resource ${resource.request.url}`);
-            }
-        }
+    page.on('requestfailed', (request) => {
+        throw new Error(`Error "${request.failure().errorText}" when requesting resource "${request.url()}".`);
+    });
+
+    page.on('response', (response) => {
+        loadedResources.push({
+            response,
+        });
+    });
 
-        callback(browser);
+    await page.goto('http://127.0.0.1:8080/testing.html', {
+        waitUntil: 'networkidle0',
     });
+    stopAllServers();
+    await callback({ page, loadedResources });
+    await page.close();
 }
 
 module.exports = {