5317: add video test

Author: Sine Jespersen

assets/tests/template/template-video.spec.js

@@ -1,7 +1,13 @@
 import { test, expect } from "@playwright/test";
 
 test("Video 0", async ({ page }) => {
-  await page.goto("/template/video-0");
+  await page.goto("template/video-0");
 
-  // TODO
+  const video = page.locator("video");
+  const source = page.locator("source");
+  await expect(video).toBeVisible();
+  await expect(source).toHaveAttribute(
+    "src",
+    "/fixtures/template/videos/test.mp4",
+  );
 });