---

name: test-automation description: Master test automation with Selenium, Cypress, Playwright, framework design, and maintainable automated tests.

Test Automation

Build robust automated test suites using modern frameworks like Selenium, Cypress, and Playwright for efficient regression testing.

When to Use This Skill

• Regression testing automation
• CI/CD integration
• API testing automation
• Cross-browser testing
• Performance testing
• Smoke test automation
• Data-driven testing
• Continuous testing

Core Concepts

1. Cypress Test Example

Copy// cypress/e2e/login.cy.js
describe('User Login', () => {
  beforeEach(() => {
    cy.visit('/login')
  })

  it('should login successfully with valid credentials', () => {
    cy.get('[data-testid="email"]').type('user@example.com')
    cy.get('[data-testid="password"]').type('SecurePass123!')
    cy.get('[data-testid="login-btn"]').click()

    cy.url().should('include', '/dashboard')
    cy.get('[data-testid="welcome-msg"]')
      .should('contain', 'Welcome')
  })

  it('should show error with invalid credentials', () => {
    cy.get('[data-testid="email"]').type('invalid@example.com')
    cy.get('[data-testid="password"]').type('wrong')
    cy.get('[data-testid="login-btn"]').click()

    cy.get('[data-testid="error-msg"]')
      .should('be.visible')
      .and('contain', 'Invalid credentials')
  })
})

2. Page Object Model

Copy// pages/LoginPage.js
class LoginPage {
  get emailInput() { return cy.get('[data-testid="email"]') }
  get passwordInput() { return cy.get('[data-testid="password"]') }
  get loginButton() { return cy.get('[data-testid="login-btn"]') }
  get errorMessage() { return cy.get('[data-testid="error-msg"]') }

  login(email, password) {
    this.emailInput.type(email)
    this.passwordInput.type(password)
    this.loginButton.click()
  }

  verifyLoginError(message) {
    this.errorMessage.should('contain', message)
  }
}

export default new LoginPage()

// Test using Page Object
import LoginPage from '../pages/LoginPage'

it('login test', () => {
  cy.visit('/login')
  LoginPage.login('user@example.com', 'password')
})

3. API Test Example (REST Assured - Java)

Copy@Test
public void testGetUser() {
    given()
        .baseUri("https://api.example.com")
        .header("Authorization", "Bearer " + token)
        .pathParam("id", "123")
    .when()
        .get("/users/{id}")
    .then()
        .statusCode(200)
        .body("id", equalTo("123"))
        .body("name", notNullValue())
        .body("email", containsString("@"));
}

Best Practices

1. Use selectors wisely - data-testid over CSS
2. Page Object Model - Maintainable structure
3. Wait strategies - Explicit over implicit
4. Independent tests - No test dependencies
5. Test data management - Fixtures, factories
6. Clear assertions - Meaningful error messages
7. Screenshot on failure - Debug information
8. CI/CD integration - Automated execution

Resources

• Cypress: https://www.cypress.io
• Playwright: https://playwright.dev
• Selenium: https://www.selenium.dev