97 lines
3.1 KiB
JavaScript
97 lines
3.1 KiB
JavaScript
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// Real-browser pass (Playwright Chromium): the zero-build page and the
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// SSR + hydration page, with console output treated as part of the spec —
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// no errors, no hydration warnings.
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//
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// Run with: npm run test:e2e (needs `npx playwright install chromium-headless-shell`)
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import { test, before, after } from 'node:test'
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import assert from 'node:assert'
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import { chromium } from 'playwright'
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import { startServer } from './serve.js'
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let browser, ctx, srv
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before(async () => {
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srv = await startServer()
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browser = await chromium.launch()
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ctx = await browser.newContext()
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})
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after(async () => {
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await browser?.close()
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await srv?.close()
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})
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// renders are raf-batched, so poll instead of reading synchronously
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function waitForCount (page, text) {
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return page.waitForFunction(
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(t) => document.querySelector('h1')?.textContent === t,
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text,
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{ timeout: 5000 }
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)
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}
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async function openPage (path) {
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const page = await ctx.newPage()
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const console_ = { errors: [], warnings: [] }
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page.on('console', (msg) => {
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if (msg.type() === 'error') console_.errors.push(msg.text())
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if (msg.type() === 'warning') console_.warnings.push(msg.text())
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})
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page.on('pageerror', (err) => console_.errors.push(String(err)))
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await page.goto(srv.origin + path)
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return { page, console_ }
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}
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test('zero-build page: import map + native ESM, no bundler', async () => {
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const { page, console_ } = await openPage('/examples/counter/')
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await waitForCount(page, 'count is 0')
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await page.click('button')
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await waitForCount(page, 'count is 1')
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await page.click('button')
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await page.click('button')
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await waitForCount(page, 'count is 3')
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assert.deepStrictEqual(console_.errors, [], 'no console errors')
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await page.close()
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})
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test('SSR page: content before JavaScript, then live after hydration', async () => {
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// the raw response must already contain the rendered view
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const res = await fetch(srv.origin + '/ssr')
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const rawHtml = await res.text()
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assert.match(rawHtml, /count is 0/, 'server sent rendered markup')
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const { page, console_ } = await openPage('/ssr')
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await waitForCount(page, 'count is 0')
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// hydrated: the server DOM must now respond to clicks
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await page.click('button')
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await waitForCount(page, 'count is 1')
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assert.deepStrictEqual(console_.errors, [], 'no console errors')
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const mismatches = console_.warnings.filter((w) => w.includes('markup differ'))
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assert.deepStrictEqual(mismatches, [], 'no hydration mismatch warnings')
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await page.close()
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})
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test('SSR page: server DOM is adopted, not replaced', async () => {
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const { page } = await openPage('/ssr')
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await waitForCount(page, 'count is 0')
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// Prove adoption by a surviving expando: mark the node, force a real
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// render, and confirm the same node object still holds the marker.
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await page.evaluate(() => {
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document.querySelector('h1').__marker = 'server-node'
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})
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await page.click('button')
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await waitForCount(page, 'count is 1')
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const marker = await page.evaluate(() => document.querySelector('h1').__marker)
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assert.strictEqual(marker, 'server-node', 'h1 survived that render in place')
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await page.close()
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})
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