Function assertRenderedBy

integrations/tests/tests/layout-shift.spec.tsx:5–10

(page: Page, type: "client" | "server")

// High level tests; more nuanced scenarios are covered by unit tests
test.describe("layout-shift", () => {
  async function assertRenderedBy(page: Page, type: "client" | "server") {
    const innerHTML = await page.evaluate(() => document.body.innerHTML);
    expect(innerHTML).toContain(
      type === "client" ? "<!-- CLIENT MARKER -->" : "<!-- SERVER MARKER -->"
    );
  }

  test.describe("client-rendered apps", () => {
    const HOST = "http://localhost:3012";