add a test

examples/redux/.test-dev.test.ts

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+import { testRun } from './.testRun'
+testRun('pnpm run dev')

examples/redux/.test-preview.test.ts

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+import { testRun } from './.testRun'
+testRun('pnpm run preview')

examples/redux/.testRun.ts

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+export { testRun }
+
+import { test, expect, run, page, getServerUrl, autoRetry } from '@brillout/test-e2e'
+
+function testRun(cmd: `pnpm run ${'dev' | 'preview'}`) {
+  run(cmd)
+
+  const content1 = 'This page is'
+  const content2 = 'The counter value is'
+
+  test('The store persists across page navigation', async () => {
+    let body: string | null
+
+    await page.goto(getServerUrl() + '/')
+    body = await page.textContent('body')
+
+    expect(body).toContain(content1)
+    await testCounter()
+
+    await page.click('a:has-text("About")')
+    await page.click('button')
+
+    body = await page.textContent('body')
+    expect(body).toContain(content2)
+    expect(await page.textContent('button')).toContain('Counter 2')
+  })
+}
+
+async function testCounter() {
+  // autoRetry() for awaiting client-side code loading & executing
+  await autoRetry(
+    async () => {
+      expect(await page.textContent('button')).toBe('Counter 0')
+      await page.click('button')
+      expect(await page.textContent('button')).toContain('Counter 1')
+    },
+    { timeout: 5 * 1000 },
+  )
+}