Selenium

Test Automation
Selenium is an open-source framework for automating web browsers. It provides tools and libraries for automating web application testing across different browsers and platforms, making it the industry standard for web automation testing.

Key Components

  • Selenium WebDriver: Browser automation API
  • Selenium IDE: Record and playback tool
  • Selenium Grid: Parallel test execution
  • Cross-Browser Support: Chrome, Firefox, Safari, Edge
  • Multiple Languages: Java, Python, C#, JavaScript

Basic Selenium Example

// Java example
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.chrome.ChromeDriver;
import org.openqa.selenium.By;

public class SeleniumTest {
    public static void main(String[] args) {
        WebDriver driver = new ChromeDriver();
        
        // Navigate to website
        driver.get("https://example.com");
        
        // Find element and interact
        driver.findElement(By.id("username")).sendKeys("testuser");
        driver.findElement(By.id("password")).sendKeys("password");
        driver.findElement(By.id("login-btn")).click();
        
        // Verify result
        String title = driver.getTitle();
        System.out.println("Page title: " + title);
        
        driver.quit();
    }
}

Common Use Cases

  • Functional Testing: Automated UI testing
  • Regression Testing: Ensuring new changes don't break existing features
  • Cross-Browser Testing: Testing across different browsers
  • Data-Driven Testing: Testing with multiple data sets
  • Continuous Integration: Automated testing in CI/CD pipelines

Career Impact

$80K
Average QA Salary
25K+
GitHub Stars
75K+
Job Openings

Learning Path

  1. Learn programming fundamentals (Java/Python)
  2. Understand web technologies (HTML, CSS, JavaScript)
  3. Master Selenium WebDriver basics
  4. Learn test frameworks (TestNG, JUnit, pytest)
  5. Practice with Page Object Model design pattern
  6. Integrate with CI/CD tools and build real projects