Add test suite

sebmarkbage · sebmarkbage · commit 1d25312078a8 · 2024-09-25T11:32:06.000-07:00
diff --git a/test/e2e/app-dir/use-cache/app/layout.tsx b/test/e2e/app-dir/use-cache/app/layout.tsx
@@ -0,0 +1,7 @@
+export default function Root({ children }: { children: React.ReactNode }) {
+  return (
+    <html>
+      <body>{children}</body>
+    </html>
+  )
+}
diff --git a/test/e2e/app-dir/use-cache/app/page.tsx b/test/e2e/app-dir/use-cache/app/page.tsx
@@ -0,0 +1,22 @@
+async function getCachedRandom(x: number) {
+  'use cache'
+  return {
+    x,
+    y: Math.random(),
+  }
+}
+
+export default async function Page({
+  searchParams,
+}: {
+  searchParams: Promise<{ n: string }>
+}) {
+  const n = +(await searchParams).n
+  const values = await getCachedRandom(n)
+  return (
+    <>
+      <p id="x">{values.x}</p>
+      <p id="y">{values.y}</p>
+    </>
+  )
+}
diff --git a/test/e2e/app-dir/use-cache/next.config.js b/test/e2e/app-dir/use-cache/next.config.js
@@ -0,0 +1,10 @@
+/**
+ * @type {import('next').NextConfig}
+ */
+const nextConfig = {
+  experimental: {
+    dynamicIO: true,
+  },
+}
+
+module.exports = nextConfig
diff --git a/test/e2e/app-dir/use-cache/use-cache.test.ts b/test/e2e/app-dir/use-cache/use-cache.test.ts
@@ -0,0 +1,28 @@
+// @ts-check
+import { nextTestSetup } from 'e2e-utils'
+
+describe('use-cache', () => {
+  const { next } = nextTestSetup({
+    files: __dirname,
+  })
+
+  it('should cache results', async () => {
+    const browser = await next.browser('/?n=1')
+    expect(await browser.waitForElementByCss('#x').text()).toBe('1')
+    const random1a = await browser.waitForElementByCss('#y').text()
+
+    await browser.loadPage(new URL('/?n=2', next.url).toString())
+    expect(await browser.waitForElementByCss('#x').text()).toBe('2')
+    const random2 = await browser.waitForElementByCss('#y').text()
+
+    await browser.loadPage(new URL('/?n=1&unrelated', next.url).toString())
+    expect(await browser.waitForElementByCss('#x').text()).toBe('1')
+    const random1b = await browser.waitForElementByCss('#y').text()
+
+    // The two navigations to n=1 should use a cached value.
+    expect(random1a).toBe(random1b)
+
+    // The navigation to n=2 should be some other random value.
+    expect(random1a).not.toBe(random2)
+  })
+})
