ci: add prerender e2e asserts

.github/workflows/e2e.yml

@@ -17,7 +17,7 @@ jobs:
       - uses: taiga-family/ci/actions/setup/[email protected]
 
       - name: Building demo-app of git-branch without cache
-        run: npx nx build demo
+        run: npx nx prerender demo
 
       - name: Upload cache / ${{ env.CACHE_DIST_KEY }}
         uses: actions/cache/[email protected]

projects/demo-playwright/tests/ssg.spec.ts

@@ -0,0 +1,19 @@
+import {expect, test} from '@playwright/test';
+
+test.describe('SSG', () => {
+    test('check responses', async ({page}) => {
+        const response = await page.goto('/');
+        const body = (await response?.text()) ?? '';
+        const prerendered = await page.evaluate(html => {
+            const parsed = new DOMParser().parseFromString(html, 'text/html');
+
+            return parsed.body.querySelector('app')?.children.length ?? 0;
+        }, body);
+
+        if (body.includes('This page was prerendered with Angular Universal')) {
+            expect(prerendered).toBeGreaterThan(0);
+        } else {
+            expect(prerendered).toBe(0);
+        }
+    });
+});