Getting Started Guide For Selenium JavaScript Testing
Selenium is an open source testing tool used for automating web browsers. It provides a framework for writing and running tests in modern programming languages such as Java, Python, C#, Ruby, and JavaScript.
This article, you will come to know about the usage of Selenium with JavaScript to automate web browser testing. Selenium with JavaScript allows developers to write and execute automated tests for web applications, ensuring that they function correctly across different browsers and platforms.
As there is an increase in complexity of modern web applications, automated testing has become an essential part of the software development process. Selenium with JavaScript provides a robust and reliable solution for web application testing, making it a valuable tool for developers and QA teams.
Why Selenium Automation Testing Using JavaScript?
Selenium automation testing using JavaScript has become increasingly popular for several reasons. Here are few pointers that are mentioned below:
I) JavaScript is widely used: JavaScript is most popular programming languages in the world, and has been used extensively in web development. Since most web applications are built using JavaScript, it makes sense to use the same language for automating tests.
II) Easy to learn: JavaScript is a relatively simple language to learn, and many developers already have experience with it. This makes it easier to write and maintain automated tests using Selenium with JavaScript.
III) Cross-platform support: Selenium with JavaScript supports cross-platform testing, allowing developers to run tests on different operating systems and web browsers.
IV) Large community: JavaScript has a large and active community, which means that there are plenty of resources available for learning and troubleshooting. This makes it easier to get started with Selenium automation testing using JavaScript.
Overall, Selenium automation testing using JavaScript is a powerful and flexible solution for automating web browser testing, making it a valuable tool for developers and QA teams.
Getting Started With Selenium Automation Testing Using JavaScript
Selenium automation testing using JavaScript involves using the Selenium WebDriver API to interact with web elements and automate tests on web applications. Here are the basic steps for getting started with Selenium automation testing using JavaScript:
- Set Up Your Development Environment
Setting up your development environment for Selenium automation testing using JavaScript typically involves the following steps:
1) Install Node.js: Node.js is a JavaScript runtime that allows developer to run JavaScript on the server-side. One can download and install Node.js from the official Node.js website (https://nodejs.org/), following the installation instructions for your operating system.
2) Install Selenium WebDriver: Selenium WebDriver is the JavaScript library that provides the API for interacting with web elements and automating tests on web browsers. You can install Selenium WebDriver using the Node.js package manager (npm) by running the command in your terminal or command prompt:
npm install selenium-webdriver
3) Choose a testing framework: Selenium WebDriver is a library for interacting with web elements, but you’ll need a testing framework to structure and run your tests. Some popular testing frameworks for JavaScript include Mocha, Jasmine, and Jest.
4) Install a web driver: Selenium WebDriver interacts with web browsers using a web driver, which is a separate executable that needs to be installed and configured. The most commonly used web drivers are ChromeDriver for Google Chrome, GeckoDriver for Mozilla Firefox, and EdgeDriver for Microsoft Edge. You can download and install the appropriate web driver for the browser you want to test from the respective driver’s official website.
5) Set up your test project: Create a new directory or folder for your test project, and initialize it as a project using npm through running the command in your terminal or through command prompt: npm init -y
6) Write your test script: Now you’re ready to start writing your test script using JavaScript and the Selenium WebDriver API. You can create a JavaScript file in your test project directory and import the Selenium WebDriver library, along with your chosen testing framework, to start writing your tests.
Once the development environment is being set-up, you can start writing and running Selenium automation tests using JavaScript that helps to interact with web elements and automate tests on web applications. Remember to refer to the documentation of Selenium WebDriver and your chosen testing framework for further guidance on how to use them effectively in your automation testing projects.
- Creating A Test Script
Creating a test script for Selenium automation testing using JavaScript involves writing code to interact with web elements and perform actions on a web application.
Here is an example of a simple test script using the Mocha testing framework and Selenium WebDriver API:
const { Builder, By, Key, until } = require(‘selenium-webdriver’);
const assert = require(‘assert’);
describe(‘Google Search’, function() {
let driver;
before(async function() {
driver = await new Builder().forBrowser(‘chrome’).build();
});
it(‘should search for Selenium in Google’, async function() {
await driver.get(‘https://www.google.com/’);
await driver.findElement(By.name(‘q’)).sendKeys(‘Selenium’, Key.RETURN);
await driver.wait(until.titleIs(‘Selenium – Google Search’), 5000);
const title = await driver.getTitle();
assert.strictEqual(title, ‘Selenium – Google Search’);
});
after(async function() {
await driver.quit();
});
});
This test script uses Mocha to define a test suite called ‘Google Search’, which contains a single test case that searches for the term ‘Selenium’ on Google and verifies that the page title matches the expected value.
In this example, the before and after functions are used to set up and tear down the Selenium WebDriver instance respectively.
The Builder object is used to create a new WebDriver instance for Google Chrome, and the driver object is used to interact with the web application. The findElement function is used to locate a web element on the page using its name attribute, and the sendKeys function is used to enter the search term and press the Enter key. The wait function is basically used to wait for the page title to match the expected value before continuing with the test. Finally, the getTitle function is used to retrieve the page title, and the assert function is used to compare it to the expected value.
This is just a simple example, and more complex test scripts may involve interacting with multiple web elements, navigating between pages, and performing more sophisticated operations.
- Run Your Test
To run your test script for Selenium automation testing using JavaScript, you can use the command-line interface (CLI) and run the test runner provided by your chosen testing framework.
Assuming you have installed Mocha as your testing framework and created a test script file named test.js in your project directory, you can run the test using the following command in your terminal or command prompt: npx mocha test.js
This will start the Mocha test runner and execute your test script, displaying the results in the console output.
If your test fails, the console output will indicate which assertion failed and provide additional details to help you diagnose the issue.
Remember to ensure that your web driver is properly installed and configured, and that your test script interacts with web elements correctly, to ensure accurate and reliable test results.
- Analyze Test Results
Analyzing test results for Selenium automation testing using JavaScript typically involves reviewing the output of the test runner and examining any error messages or failures that occurred during the test.
When a test fails, the test runner will typically provide detailed information about the error, including the line number where the failure occurred and any relevant error messages or stack traces. It is important to carefully review this information that helps to rectify the root cause of the failure and make any necessary changes to your test script or web application.
In addition to reviewing error messages and stack traces, you may also want to consider capturing screenshots or other diagnostic information during your test runs to help identify issues with your web application or test environment. Selenium provides APIs for capturing screenshots and other types of data during test execution, which can be helpful for debugging and troubleshooting issues.
Once the issue has been rectified with your test script or web application, you can re-run the test to verify that the changes have been successful. Over time, you can use the results of your test runs to identify trends, track the performance of your web application, and ensure that your tests remain reliable and effective.
Conclusion
Selenium automation testing using JavaScript is a powerful and flexible approach to testing web applications, allowing developers and testers to automate a wide range of tasks and operations in a highly efficient and repeatable manner. With the help of tools like Selenium WebDriver and the Mocha testing framework, it is possible to create and execute test scripts that interact with web elements, simulate user interactions, and verify the behavior and functionality of web applications.
At LambdaTest, we offer a comprehensive digital experience Selenium testing cloud that allows you to run your test scripts on a wide range of web browsers and operating systems, ensuring quality releases and accelerated digital transformation. Our platform provides a robust set of features for Selenium automation testing using JavaScript, including cross-browser testing, parallel testing, and real-time testing, all backed by a team of expert support technicians and a global network of testing infrastructure.
Whether you are new to Selenium testing or an experienced automation engineer, LambdaTest can help you optimize your testing workflows and ensure that your web applications are performing at their best.
