Selenium Javascript Automation Testing Tutorial For Beginners

Selenium Javascript Automation Testing Tutorial For Beginners

6 min read Jun 18, 2024
Selenium Javascript Automation Testing Tutorial For Beginners

Selenium JavaScript Automation Testing Tutorial for Beginners

This tutorial will guide you through the basics of automating web application testing using Selenium with JavaScript.

What is Selenium?

Selenium is a powerful open-source tool for web browser automation. It allows you to write scripts that can interact with web pages just like a real user would, making it ideal for automated testing.

Why Use Selenium?

Here are some compelling reasons to incorporate Selenium into your testing workflow:

  • Increased Test Coverage: Automate repetitive and complex test scenarios, enabling you to cover a broader range of user interactions.
  • Reduced Manual Effort: Save time and resources by automating tedious tasks, freeing up your team for more complex testing activities.
  • Improved Accuracy and Consistency: Eliminate human error by executing test cases consistently and reliably.
  • Faster Feedback: Run tests frequently to identify issues early in the development cycle, leading to quicker bug fixes.

Setting Up Your Environment

Before diving into coding, you need to set up your testing environment:

  1. Node.js: Download and install Node.js from to work with JavaScript code.

  2. Selenium WebDriver: Install the Selenium WebDriver package for JavaScript using npm:

    npm install selenium-webdriver
    
  3. Web Browser Driver: Download the appropriate browser driver (e.g., ChromeDriver for Chrome) from .

Writing Your First Selenium Test

Let's write a simple test to check the title of a webpage:

const { Builder, By, Key, until } = require('selenium-webdriver');

async function testTitle() {
  let driver = await new Builder().forBrowser('chrome').build();

  try {
    await driver.get('https://www.google.com/');
    let title = await driver.getTitle();
    console.log(`Page title: Selenium Javascript Automation Testing Tutorial For Beginners`);
    if (title === 'Google') {
      console.log('Test passed!');
    } else {
      console.log('Test failed!');
    }
  } finally {
    await driver.quit();
  }
}

testTitle();

Explanation:

  • Import necessary modules: We import the Builder, By, Key, and until modules from selenium-webdriver.
  • Create a WebDriver instance: We create a WebDriver instance for Chrome using new Builder().forBrowser('chrome').build().
  • Navigate to the webpage: We use driver.get('https://www.google.com/') to open Google's website.
  • Get the page title: We retrieve the page title using driver.getTitle().
  • Perform assertions: We compare the title with the expected value ('Google') and print a message indicating whether the test passed or failed.
  • Quit the driver: We close the browser using driver.quit().

Locating Web Elements

Selenium provides various methods to locate specific elements on a web page:

  • By ID: driver.findElement(By.id('elementId'))
  • By Class Name: driver.findElement(By.className('className'))
  • By Tag Name: driver.findElement(By.tagName('tagName'))
  • By CSS Selector: driver.findElement(By.css('cssSelector'))
  • By XPath: driver.findElement(By.xpath('xpathExpression'))

Interacting with Web Elements

Once you've located an element, you can interact with it using methods like:

  • Click: element.click()
  • Send Keys: element.sendKeys('text')
  • Clear: element.clear()
  • Get Text: element.getText()
  • Get Attribute: element.getAttribute('attributeName')

Advanced Concepts

As you become more familiar with Selenium, you can explore advanced features like:

  • Waiting for elements: Use driver.wait() or until methods to ensure an element is loaded before interacting with it.
  • Working with frames: Use driver.switchTo().frame() to switch to a specific iframe.
  • Taking screenshots: Capture snapshots of the browser window using driver.takeScreenshot().
  • Handling alerts: Interact with browser alerts using driver.switchTo().alert().

Conclusion

This tutorial provides a foundation for automating web application testing using Selenium with JavaScript. As you practice and explore more advanced concepts, you'll become proficient in building comprehensive and robust automated tests. Remember to use clear and concise code, organize your tests effectively, and implement best practices for writing maintainable automation scripts.