Try to fix test

karma.conf.js

@@ -0,0 +1,43 @@
+const os = require('os');
+const path = require('path');
+const { computeExecutablePath, Browser } = require('@puppeteer/browsers');
+const puppeteer = require('puppeteer');
+
+// Resolve the Chrome that Puppeteer downloaded so tests run without a
+// system-installed browser, both locally and in CI containers.
+// Puppeteer v25 made executablePath() async, which a sync karma.conf cannot
+// await — so we compute the path synchronously via @puppeteer/browsers instead.
+const buildId = puppeteer.PUPPETEER_REVISIONS.chrome;
+const cacheDir = process.env.PUPPETEER_CACHE_DIR || path.join(os.homedir(), '.cache', 'puppeteer');
+process.env.CHROME_BIN = computeExecutablePath({ browser: Browser.CHROME, buildId, cacheDir });
+
+module.exports = function (config) {
+  config.set({
+    basePath: '',
+    frameworks: ['jasmine'],
+    plugins: [
+      require('karma-jasmine'),
+      require('karma-chrome-launcher'),
+      require('karma-jasmine-html-reporter'),
+      require('karma-coverage'),
+    ],
+    jasmineHtmlReporter: {
+      suppressAll: true,
+    },
+    coverageReporter: {
+      dir: path.join(__dirname, 'coverage', 'playground-frontend'),
+      subdir: '.',
+      reporters: [{ type: 'html' }, { type: 'text-summary' }],
+    },
+    reporters: ['progress', 'kjhtml'],
+    browsers: ['ChromeHeadlessNoSandbox'],
+    customLaunchers: {
+      ChromeHeadlessNoSandbox: {
+        base: 'ChromeHeadless',
+        // CI containers run as root with no sandbox; /dev/shm is often too small.
+        flags: ['--no-sandbox', '--headless', '--disable-gpu', '--disable-dev-shm-usage'],
+      },
+    },
+    restartOnFileChange: true,
+  });
+};