cypress-playwright-setup（Cypress Playwright 设置）

Cypress & Playwright Setup

Configure comprehensive end-to-end testing for web applications.

Core Workflow

1. Choose tool: Cypress or Playwright
2. Configure project: Browser and test settings
3. Create page objects: Reusable selectors
4. Write tests: User journey coverage
5. Setup fixtures: Test data
6. Integrate CI: Automated testing

Playwright Setup

Installation

npm init playwright@latest

Configuration

// playwright.config.ts
import { defineConfig, devices } from '@playwright/test';

export default defineConfig({
  testDir: './e2e',
  fullyParallel: true,
  forbidOnly: !!process.env.CI,
  retries: process.env.CI ? 2 : 0,
  workers: process.env.CI ? 1 : undefined,
  reporter: [
    ['html'],
    ['json', { outputFile: 'test-results/results.json' }],
    ['junit', { outputFile: 'test-results/junit.xml' }],
  ],

  use: {
    baseURL: process.env.BASE_URL || 'http://localhost:3000',
    trace: 'on-first-retry',
    screenshot: 'only-on-failure',
    video: 'retain-on-failure',
  },

  projects: [
    {
      name: 'chromium',
      use: { ...devices['Desktop Chrome'] },
    },
    {
      name: 'firefox',
      use: { ...devices['Desktop Firefox'] },
    },
    {
      name: 'webkit',
      use: { ...devices['Desktop Safari'] },
    },
    {
      name: 'Mobile Chrome',
      use: { ...devices['Pixel 5'] },
    },
    {
      name: 'Mobile Safari',
      use: { ...devices['iPhone 12'] },
    },
  ],

  webServer: {
    command: 'npm run start',
    url: 'http://localhost:3000',
    reuseExistingServer: !process.env.CI,
    timeout: 120 * 1000,
  },
});

Page Object Model

// e2e/pages/BasePage.ts
import { Page, Locator } from '@playwright/test';

export abstract class BasePage {
  readonly page: Page;

  constructor(page: Page) {
    this.page = page;
  }

  async goto(path: string = '') {
    await this.page.goto(path);
  }

  async waitForLoad() {
    await this.page.waitForLoadState('networkidle');
  }

  getByTestId(testId: string): Locator {
    return this.page.getByTestId(testId);
  }
}

// e2e/pages/LoginPage.ts
import { Page, Locator, expect } from '@playwright/test';
import { BasePage } from './BasePage';

export class LoginPage extends BasePage {
  readonly emailInput: Locator;
  readonly passwordInput: Locator;
  readonly submitButton: Locator;
  readonly errorMessage: Locator;
  readonly forgotPasswordLink: Locator;

  constructor(page: Page) {
    super(page);
    this.emailInput = page.getByLabel('Email');
    this.passwordInput = page.getByLabel('Password');
    this.submitButton = page.getByRole('button', { name: 'Sign in' });
    this.errorMessage = page.getByTestId('error-message');
    this.forgotPasswordLink = page.getByRole('link', { name: 'Forgot password?' });
  }

  async goto() {
    await super.goto('/login');
    await this.waitForLoad();
  }

  async login(email: string, password: string) {
    await this.emailInput.fill(email);
    await this.passwordInput.fill(password);
    await this.submitButton.click();
  }

  async expectError(message: string) {
    await expect(this.errorMessage).toBeVisible();
    await expect(this.errorMessage).toContainText(message);
  }

  async expectLoginSuccess() {
    await expect(this.page).toHaveURL(/\/dashboard/);
  }
}

// e2e/pages/DashboardPage.ts
import { Page, Locator, expect } from '@playwright/test';
import { BasePage } from './BasePage';

export class DashboardPage extends BasePage {
  readonly welcomeMessage: Locator;
  readonly userMenu: Locator;
  readonly logoutButton: Locator;
  readonly sidebar: Locator;

  constructor(page: Page) {
    super(page);
    this.welcomeMessage = page.getByTestId('welcome-message');
    this.userMenu = page.getByTestId('user-menu');
    this.logoutButton = page.getByRole('button', { name: 'Logout' });
    this.sidebar = page.getByTestId('sidebar');
  }

  async goto() {
    await super.goto('/dashboard');
    await this.waitForLoad();
  }

  async logout() {
    await this.userMenu.click();
    await this.logoutButton.click();
    await expect(this.page).toHaveURL('/login');
  }

  async expectWelcome(name: string) {
    await expect(this.welcomeMessage).toContainText(`Welcome, ${name}`);
  }
}

Test Examples

// e2e/auth.spec.ts
import { test, expect } from '@playwright/test';
import { LoginPage } from './pages/LoginPage';
import { DashboardPage } from './pages/DashboardPage';

test.describe('Authentication', () => {
  let loginPage: LoginPage;

  test.beforeEach(async ({ page }) => {
    loginPage = new LoginPage(page);
    await loginPage.goto();
  });

  test('successful login', async ({ page }) => {
    await loginPage.login('test@example.com', 'password123');
    await loginPage.expectLoginSuccess();

    const dashboard = new DashboardPage(page);
    await dashboard.expectWelcome('Test User');
  });

  test('invalid credentials', async () => {
    await loginPage.login('test@example.com', 'wrongpassword');
    await loginPage.expectError('Invalid email or password');
  });

  test('empty fields validation', async () => {
    await loginPage.submitButton.click();
    await expect(loginPage.page.getByText('Email is required')).toBeVisible();
    await expect(loginPage.page.getByText('Password is required')).toBeVisible();
  });

  test('forgot password flow', async ({ page }) => {
    await loginPage.forgotPasswordLink.click();
    await expect(page).toHaveURL('/forgot-password');
  });
});

Fixtures

// e2e/fixtures/auth.fixture.ts
import { test as base, expect } from '@playwright/test';
import { LoginPage } from '../pages/LoginPage';
import { DashboardPage } from '../pages/DashboardPage';

interface AuthFixtures {
  loginPage: LoginPage;
  dashboardPage: DashboardPage;
  authenticatedPage: DashboardPage;
}

export const test = base.extend<AuthFixtures>({
  loginPage: async ({ page }, use) => {
    const loginPage = new LoginPage(page);
    await use(loginPage);
  },

  dashboardPage: async ({ page }, use) => {
    const dashboardPage = new DashboardPage(page);
    await use(dashboardPage);
  },

  authenticatedPage: async ({ page }, use) => {
    // Login before test
    const loginPage = new LoginPage(page);
    await loginPage.goto();
    await loginPage.login('test@example.com', 'password123');
    await loginPage.expectLoginSuccess();

    const dashboardPage = new DashboardPage(page);
    await use(dashboardPage);
  },
});

export { expect };

// e2e/dashboard.spec.ts
import { test, expect } from './fixtures/auth.fixture';

test.describe('Dashboard', () => {
  test('shows user data', async ({ authenticatedPage }) => {
    await authenticatedPage.expectWelcome('Test User');
  });

  test('logout redirects to login', async ({ authenticatedPage }) => {
    await authenticatedPage.logout();
  });
});

Cypress Setup

Installation

npm install -D cypress @testing-library/cypress
npx cypress open

Configuration

// cypress.config.ts
import { defineConfig } from 'cypress';

export default defineConfig({
  e2e: {
    baseUrl: 'http://localhost:3000',
    viewportWidth: 1280,
    viewportHeight: 720,
    video: true,
    screenshotOnRunFailure: true,
    retries: {
      runMode: 2,
      openMode: 0,
    },
    experimentalStudio: true,
    setupNodeEvents(on, config) {
      // Tasks and plugins
    },
  },

  component: {
    devServer: {
      framework: 'react',
      bundler: 'vite',
    },
  },
});

Support Commands

// cypress/support/commands.ts
import '@testing-library/cypress/add-commands';

declare global {
  namespace Cypress {
    interface Chainable {
      login(email: string, password: string): Chainable<void>;
      getByTestId(testId: string): Chainable<JQuery<HTMLElement>>;
      mockApi(fixture: string): Chainable<void>;
    }
  }
}

Cypress.Commands.add('login', (email: string, password: string) => {
  cy.session([email, password], () => {
    cy.visit('/login');
    cy.get('[data-testid="email-input"]').type(email);
    cy.get('[data-testid="password-input"]').type(password);
    cy.get('[data-testid="submit-button"]').click();
    cy.url().should('include', '/dashboard');
  });
});

Cypress.Commands.add('getByTestId', (testId: string) => {
  return cy.get(`[data-testid="${testId}"]`);
});

Cypress.Commands.add('mockApi', (fixture: string) => {
  cy.intercept('GET', '/api/**', { fixture }).as('apiCall');
});

Cypress Tests

// cypress/e2e/auth.cy.ts
describe('Authentication', () => {
  beforeEach(() => {
    cy.visit('/login');
  });

  it('logs in successfully', () => {
    cy.get('[data-testid="email-input"]').type('test@example.com');
    cy.get('[data-testid="password-input"]').type('password123');
    cy.get('[data-testid="submit-button"]').click();

    cy.url().should('include', '/dashboard');
    cy.getByTestId('welcome-message').should('contain', 'Welcome');
  });

  it('shows error for invalid credentials', () => {
    cy.get('[data-testid="email-input"]').type('test@example.com');
    cy.get('[data-testid="password-input"]').type('wrongpassword');
    cy.get('[data-testid="submit-button"]').click();

    cy.getByTestId('error-message').should('be.visible');
    cy.url().should('include', '/login');
  });

  it('validates required fields', () => {
    cy.get('[data-testid="submit-button"]').click();
    cy.contains('Email is required').should('be.visible');
    cy.contains('Password is required').should('be.visible');
  });
});

API Mocking in Cypress

// cypress/e2e/products.cy.ts
describe('Products', () => {
  beforeEach(() => {
    cy.login('test@example.com', 'password123');
  });

  it('displays products from API', () => {
    cy.intercept('GET', '/api/products', {
      fixture: 'products.json',
    }).as('getProducts');

    cy.visit('/products');
    cy.wait('@getProducts');

    cy.getByTestId('product-card').should('have.length', 3);
  });

  it('handles API error gracefully', () => {
    cy.intercept('GET', '/api/products', {
      statusCode: 500,
      body: { error: 'Server Error' },
    }).as('getProductsError');

    cy.visit('/products');
    cy.wait('@getProductsError');

    cy.getByTestId('error-message').should('contain', 'Failed to load products');
  });

  it('filters products', () => {
    cy.intercept('GET', '/api/products?category=electronics', {
      fixture: 'products-electronics.json',
    }).as('getElectronics');

    cy.visit('/products');
    cy.getByTestId('category-filter').select('electronics');

    cy.wait('@getElectronics');
    cy.getByTestId('product-card').should('have.length', 2);
  });
});

CI Integration

GitHub Actions

# .github/workflows/e2e.yml
name: E2E Tests

on:
  push:
    branches: [main]
  pull_request:
    branches: [main]

jobs:
  playwright:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - uses: actions/setup-node@v4
        with:
          node-version: 20
          cache: 'npm'

      - run: npm ci

      - name: Install Playwright Browsers
        run: npx playwright install --with-deps

      - name: Build
        run: npm run build

      - name: Run Playwright tests
        run: npx playwright test
        env:
          CI: true

      - uses: actions/upload-artifact@v4
        if: always()
        with:
          name: playwright-report
          path: playwright-report/
          retention-days: 30

  cypress:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - uses: actions/setup-node@v4
        with:
          node-version: 20
          cache: 'npm'

      - run: npm ci

      - name: Cypress run
        uses: cypress-io/github-action@v6
        with:
          build: npm run build
          start: npm start
          wait-on: 'http://localhost:3000'
          browser: chrome
          record: true
        env:
          CYPRESS_RECORD_KEY: ${{ secrets.CYPRESS_RECORD_KEY }}
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - uses: actions/upload-artifact@v4
        if: failure()
        with:
          name: cypress-screenshots
          path: cypress/screenshots

Accessibility Testing

// e2e/accessibility.spec.ts (Playwright)
import { test, expect } from '@playwright/test';
import AxeBuilder from '@axe-core/playwright';

test.describe('Accessibility', () => {
  test('homepage has no accessibility violations', async ({ page }) => {
    await page.goto('/');

    const accessibilityScanResults = await new AxeBuilder({ page }).analyze();

    expect(accessibilityScanResults.violations).toEqual([]);
  });

  test('login page has no accessibility violations', async ({ page }) => {
    await page.goto('/login');

    const accessibilityScanResults = await new AxeBuilder({ page })
      .withTags(['wcag2a', 'wcag2aa'])
      .analyze();

    expect(accessibilityScanResults.violations).toEqual([]);
  });
});

// cypress/e2e/accessibility.cy.ts
import 'cypress-axe';

describe('Accessibility', () => {
  beforeEach(() => {
    cy.injectAxe();
  });

  it('homepage has no accessibility violations', () => {
    cy.visit('/');
    cy.checkA11y();
  });

  it('login form is accessible', () => {
    cy.visit('/login');
    cy.checkA11y('[data-testid="login-form"]');
  });
});

Best Practices

1. Use page objects: Maintainable selectors
2. Use test IDs: Stable element selection
3. Avoid sleep: Use proper waits
4. Isolate tests: No dependencies between tests
5. Mock external APIs: Reliable, fast tests
6. Test accessibility: Include a11y checks
7. Parallel execution: Faster CI
8. Meaningful assertions: Clear expectations

Output Checklist

Every E2E setup should include:

• Playwright/Cypress configuration
• Page object model
• Custom commands/fixtures
• API mocking setup
• Authentication handling
• Multi-browser testing
• Accessibility tests
• CI integration
• Reporting configuration
• Screenshot/video on failure