E2e Testing Expert

E2E Testing Expert (Playwright 1.50+ & Vitest 3 Standard)

English | Bahasa Indonesia

English

Orchestration & Integration

• TDD & Autonomous Debugging: autonomous-tdd-debugger, property-mutation-testing-expert
• Quality Gates & Anti-Slop: anti-slop, ai-code-review-autonomous, zero-tech-debt-auditor
• Accessibility & Browser Automation: accessibility-testing-expert, browser-automation-expert
• CI/CD & DevOps Automation: ci-cd-devops-architect, github-actions-expert
• Lifecycle & Governance: brainstorming, zero-to-prod-orchestrator, session-memory-manager

Description

Production-grade guide for automated browser and component testing using Playwright 1.50+ and Vitest 3+. Covers virtual clock manipulation with page.clock, semantic accessibility assertions with toMatchAriaSnapshot, type-safe composable fixtures, dynamic UI banner interception (page.addLocatorHandler), session state reuse (storageState), and CI matrix sharding.

Trigger Conditions

• Writing End-to-End (E2E) browser test suites for Next.js 15, React 19, or Svelte 5 applications.
• Testing time-sensitive UI (countdown timers, session expiries, debounced search) deterministically.
• Verifying WCAG accessibility tree structure using semantic aria-snapshot.
• Creating composable test fixtures with authenticated contexts and isolated database state.
• Setting up parallel CI test execution with artifact uploads on test failure.

Playwright 1.50+ Core Architectural Patterns

1. Deterministic Time Testing with the Clock API (page.clock)

Eliminate flaky page.waitForTimeout by freezing, fast-forwarding, or setting system time:

typescriptCopy code
// tests/e2e/timer.spec.ts
import { test, expect } from '@playwright/test';

test('advances countdown timer deterministically', async ({ page }) => {
  // 1. Install virtual clock fixed at specific timestamp
  await page.clock.install({ time: new Date('2026-03-01T12:00:00Z') });
  await page.goto('/promotions/flash-sale');

  // Verify initial state
  const countdown = page.getByRole('timer');
  await expect(countdown).toHaveText('24:00:00');

  // 2. Fast forward 6 hours in 1 millisecond without waiting!
  await page.clock.fastForward('06:00:00');
  await expect(countdown).toHaveText('18:00:00');

  // 3. Fast forward past expiration
  await page.clock.fastForward('18:00:01');
  await expect(page.getByRole('alert')).toHaveText('This promotion has ended.');
});

2. Semantic Accessibility Assertions (toMatchAriaSnapshot)

Assert the rendered accessible role tree rather than fragile DOM classes:

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// tests/e2e/navigation.spec.ts
import { test, expect } from '@playwright/test';

test('navigation bar renders semantic accessible structure', async ({ page }) => {
  await page.goto('/');

  const header = page.locator('header');
  await expect(header).toMatchAriaSnapshot(`
    - banner:
      - link "Brand Logo":
        - /url: //
      - navigation:
        - link "Products"
        - link "Docs"
        - link "Pricing"
      - button "Sign in"
  `);
});

3. Automatic Banner & Dialog Interception (page.addLocatorHandler)

Dismiss cookie banners or dynamic popups automatically whenever they appear:

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// tests/e2e/fixtures.ts
import { test as base, expect } from '@playwright/test';

export const test = base.extend({
  page: async ({ page }, use) => {
    // Automatically dismiss cookie consent modals whenever they overlay the page
    const consentButton = page.getByRole('button', { name: 'Accept all cookies' });
    await page.addLocatorHandler(consentButton, async () => {
      await consentButton.click();
    });

    await use(page);
  },
});

4. Reusable Authentication State (storageState)

Authenticate once in a setup project and inject session cookies into all test suites:

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// tests/e2e/auth.setup.ts
import { test as setup, expect } from '@playwright/test';

const authFile = 'playwright/.auth/admin.json';

setup('authenticate admin user', async ({ page }) => {
  await page.goto('/login');
  await page.getByLabel('Email').fill('admin@enterprise.test');
  await page.getByLabel('Password').fill('VaultP@ssw0rd2026!');
  await page.getByRole('button', { name: 'Sign in' }).click();

  await page.waitForURL('/dashboard');
  await expect(page.getByRole('heading', { name: 'Overview' })).toBeVisible();

  // Persist storage state (cookies, localStorage, session tokens)
  await page.context().storageState({ path: authFile });
});

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// tests/e2e/billing.spec.ts
import { test, expect } from '@playwright/test';

// Reuse authenticated state automatically
test.use({ storageState: 'playwright/.auth/admin.json' });

test('admin can view billing invoices', async ({ page }) => {
  await page.goto('/billing/invoices');
  await expect(page.getByRole('heading', { name: 'Invoices' })).toBeVisible();
});

5. CI Test Sharding in GitHub Actions

Split Playwright test executions across parallel workers in CI:

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# .github/workflows/e2e.yml
name: Playwright Tests
on: [push, pull_request]

jobs:
  test:
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      matrix:
        shardIndex: [1, 2, 3, 4]
        shardTotal: [4]
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node@v4
        with: { node-version: '22', cache: 'pnpm' }
      - run: pnpm install --frozen-lockfile
      - run: pnpm exec playwright install --with-deps chromium
      - name: Run Playwright Tests (Shard ${{ matrix.shardIndex }}/${{ matrix.shardTotal }})
        run: pnpm exec playwright test --shard=${{ matrix.shardIndex }}/${{ matrix.shardTotal }}
      - uses: actions/upload-artifact@v4
        if: failure()
        with:
          name: playwright-blob-${{ matrix.shardIndex }}
          path: blob-report/

Sovereign Execution, Token Efficiency & Invariants

Bahasa Indonesia

Integrasi Orkestrasi

• TDD & Debugging Otonom: autonomous-tdd-debugger, property-mutation-testing-expert
• Gerbang Kualitas & Anti-Slop: anti-slop, ai-code-review-autonomous, zero-tech-debt-auditor
• Aksesibilitas & Otomasi Browser: accessibility-testing-expert, browser-automation-expert
• CI/CD & Otomasi DevOps: ci-cd-devops-architect, github-actions-expert
• Siklus Hidup & Tata Kelola: brainstorming, zero-to-prod-orchestrator, session-memory-manager

Deskripsi

Panduan produksi untuk pengujian browser dan komponen otomatis menggunakan Playwright 1.50+ dan Vitest 3+. Mencakup manipulasi jam virtual deterministik dengan page.clock, asersi pohon aksesibilitas semantis dengan toMatchAriaSnapshot, pembuatan test fixture modular, penanganan banner modal dinamis (page.addLocatorHandler), penggunaan ulang sesi autentikasi (storageState), dan sharding paralel di CI.

Kondisi Pemicu

• Menulis test suite E2E browser untuk aplikasi Next.js 15, React 19, atau Svelte 5.
• Menguji antarmuka berbasis waktu (countdown timer, kedaluwarsa sesi) secara deterministik tanpa jeda waktu riil.
• Memvalidasi struktur pohon aksesibilitas menggunakan asersi semantis aria-snapshot.
• Mengonfigurasi fixture pengujian dengan isolasi state autentikasi dan database.
• Menjalankan pipeline pengujian terdistribusi secara paralel di GitHub Actions.

Pola Kunci Playwright 1.50+

1. Pengujian Waktu Deterministik Menggunakan Clock API (page.clock)

Hilangkan ketergantungan pada time.Sleep atau waitForTimeout dengan memajukan jam virtual seketika:

typescriptCopy code
import { test, expect } from '@playwright/test';

test('menguji countdown diskon secara deterministik', async ({ page }) => {
  // 1. Pasang jam virtual pada tanggal tertentu
  await page.clock.install({ time: new Date('2026-03-01T12:00:00Z') });
  await page.goto('/promo');

  const timer = page.getByRole('timer');
  await expect(timer).toHaveText('24:00:00');

  // 2. Majukan waktu 6 jam secara instan (1 milidetik)
  await page.clock.fastForward('06:00:00');
  await expect(timer).toHaveText('18:00:00');

  // 3. Majukan hingga waktu promo berakhir
  await page.clock.fastForward('18:00:01');
  await expect(page.getByRole('alert')).toHaveText('Promo ini telah berakhir.');
});

2. Asersi Aksesibilitas Semantis (toMatchAriaSnapshot)

Validasi struktur aksesibilitas UI tanpa terikat pada class CSS atau tag DOM yang rapuh:

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import { test, expect } from '@playwright/test';

test('navigasi memenuhi standar aksesibilitas', async ({ page }) => {
  await page.goto('/');

  await expect(page.locator('header')).toMatchAriaSnapshot(`
    - banner:
      - link "Logo":
        - /url: //
      - navigation:
        - link "Produk"
        - link "Dokumentasi"
        - link "Harga"
      - button "Masuk"
  `);
});

3. Penanganan Banner Otomatis (page.addLocatorHandler)

Tutup banner persetujuan cookie atau modal promosi secara otomatis kapan pun elemen tersebut muncul:

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import { test as base } from '@playwright/test';

export const test = base.extend({
  page: async ({ page }, use) => {
    const tombolCookie = page.getByRole('button', { name: 'Setujui semua' });
    await page.addLocatorHandler(tombolCookie, async () => {
      await tombolCookie.click();
    });

    await use(page);
  },
});

Matriks Eksekusi Berdaulat, Efisiensi Token & Invarian