Try that

.github/workflows/CI.yml

@@ -16,4 +16,6 @@ jobs:
       - run: yarn prettier:check
       - run: yarn build:all
       - run: yarn lint:all
-      - run: yarn test:all
+      - uses: GabrielBB/xvfb-action@v1
+        with:
+          run: yarn test:all

extension/test/chrome/extension.spec.js

@@ -18,8 +18,9 @@ describe('Chrome extension', function () {
       .withCapabilities({
         chromeOptions: {
           args: [
-            'no-sandbox',
-            'disable-dev-shm-usage',
+            '--no-sandbox',
+            '--disable-dev-shm-usage',
+            '--headless',
             `load-extension=${path}`,
           ],
         },

extension/test/electron/devpanel.spec.js

@@ -18,8 +18,9 @@ describe('DevTools panel for Electron', function () {
         chromeOptions: {
           binary: electronPath,
           args: [
-            'no-sandbox',
-            'disable-dev-shm-usage',
+            '--no-sandbox',
+            '--disable-dev-shm-usage',
+            '--headless',
             `app=${join(__dirname, 'fixture')}`,
           ],
         },