What Is Selenium Testing? A Complete Beginner’s Guide

Selenium is widely enjoy by web quizzer around the world thanks to its versatility and simplicity. Testing with Selenium is quite square, which is why it is commonly utilize for people who want to go from manual to automation examination.
 

In this clause, we ’ ll show you how to do Selenium testing in deepness.

History of Selenium

Selenium commence in 2004 when Jason Huggins, an engineer at ThoughtWorks, needed to test a web application frequently. To avoid the tussle of manual testing, he build a JavaScript tool name JavaScriptTestRunner to automate user action like clicking and typewrite.

Later, this tool was renamed Selenium Core, and it go popular within ThoughtWorks. However, it had a major limitation: it couldn ’ t bypass a browser ’ s same-origin policy, which blocked interactions with different domains.

In 2005, Paul Hammant created Selenium Remote Control (RC) to solve this issue. It allowed tests to be written in diverse programing languages and run across different browsers using a waiter to shoot JavaScript. This made Selenium more flexible and widely adopted.

In 2006, Simon Stewart from Google developed Selenium WebDriver, which directly controlled browsers use their native APIs, making automation quicker and more reliable.

By 2024, Selenium 4 is the latest version. It offer a simpler API, better browser support, and native WebDriver protocol, making web automation easier and more effective.

Understanding Selenium

Selenium is an open-source cortege of tools designed for automating web browsers. It provides a way to interact with web pages through a programmatic interface, making it possible to do task such as descriptor submission, navigation, and data extraction automatically. & nbsp;
 

You can write Selenium test playscript in Java, C #, Python, Ruby, JavaScript, and more.
 

Selenium has 3 core components:

1. Selenium WebDriver

This is the nucleus of the Selenium entourage. It provides a programming interface to create and execute browser-based exam scripts.
 

Simply put, Selenium WebDriver allows you to pass straightaway with the browser you want to test on using a dedicated driver for that browser. It controls the browser by sending it commands (like click a button or filling out a form) and receiving responses (like checking if a button is displayed or if a form was state successfully).
 

There are commonly 4 steps in the operation:

1. A WebDriver object is created in the desired programming language. This object corresponds to a specific browser (e.g., ChromeDriver for Google Chrome).
2. The WebDriver institute a session with the browser, initiating a controlled instance of the browser.
3. WebDriver sends commands to the browser (e.g., open a URL, click a push, enter text in a form battlefield). These commands are executed in the browser just as if a human user were performing the actions.
4. The browser sends responses back to the WebDriver. These responses contain information about the success or failure of the commands, as easily as any information requested (e.g., the text of a web element, the status of a form submission).
5. Once the test book has completed its tasks, the WebDriver terminates the session, closing the browser.
   
   

Each browser has a different driver, which is:

• ChromeDriver for Google Chrome
• GeckoDriver for Mozilla Firefox
• EdgeDriver for Microsoft Edge
• SafariDriver for Safari

Selenium WebDriver offer you a rich set of commands to execute on-web interactions with its elements. You can locate those elements employ several strategies:

• By ID
• By Name
• By Class Name
• By Tag Name
• By CSS Selector
• By XPath

2. Selenium Grid

Selenium Grid is a tool designed to facilitate the parallel execution of test suit across multiple machines and browsers simultaneously. Running tests in latitude significantly reduces the overall clip required to complete a test suite. Instead of waiting for one test to finish before part another, multiple tests run at the like time.
 

Selenium Grid has 2 core components:

• Hub: & nbsp;a server that get test requests from clients (test handwriting) and routes them to the appropriate nodes. It is responsible for managing the distribution of test requests to node free-base on the test demand and available resources. & nbsp;
• Node: & nbsp;the machines that actually execute the exam example. Each node is connected to the hub and can run test on a specific browser or operating system. Each node can be configured with various choice like the type of browsers it supports, the version of the browser, and the operating scheme. Nodes can be dynamically added or take from the grid based on the testing needs.

Here ’ s how Selenium Grid works:

A typical test execution flowing in Selenium happens in these steps:

1. A test book is written using Selenium WebDriver in a supported programming language.
2. The tryout hand specifies details like the browser character, version, and control scheme, then sends a test request to the Hub.
3. The Hub get the request and checks the specified details.
4. The Hub seem through its inclination of available Nodes to happen one that matches the postulation.
5. The Hub picks a worthy Node and assigns the trial to it.
6. The Hub forwards the test request to the selected Node.
7. The Node acquire the test request and part running the examination.
8. The Node open the browser, performs the actions from the test script, and interacts with the web application.
9. After the test coating, the Node sends the results (pass/fail status, logs, screenshots) back to the Hub.
10. The Hub combines the results from all Nodes and share the final outcome with the test hand or reporting creature.

Communication between the Hub and Nodes is usually perform in JSON format, where trial requests, details, and results are send as JSON data.

3. Selenium IDE

The primary purpose of Selenium IDE is to make the process of creating and executing automated tests more accessible and less time-consuming, especially for users who may not have extensive programming experience.
 

Selenium IDE grant users to enter their interaction with a web application, such as tick buttons, entering schoolbook, and navigating through pages. During the transcription session, every action is captured and converted into a examination script.

How It Works: Users start the transcription session by clicking a button in the IDE, so execute actions in the web application. Selenium IDE automatically generates a sequence of commands based on these activeness. This eliminates the need for manual coding, make Selenium more accessible to non-programmers and zip up exam case conception.

After tape, users can run the exam handwriting, and Selenium IDE will replay the recorded actions in the browser. The IDE exhibit the outcome of the test, including any errors or number encounter.

Selenium IDE allows exploiter to set breakpoints in their trial scripts. When a breakpoint is reached during execution, the IDE intermit the test, enabling exploiter to visit the province of the coating and hand.

Steps To Start Selenium Testing

1. Prepare your skills

To effectively use Selenium, you should have a basic understanding of at least one programming language. Java, Python, C #, and Ruby is the most popular option. Knowledge of programme conception such as variable, eyelet, conditionals, and functions is also essential.
 

After that, make sure you understand the basics of web technologies:

• HTML
• CSS
• JavaScript
• Web element mechanics (forms, push, links, etc.)

Get your IDE ready. Popular IDEs for Selenium are:

• Eclipse: An open-source IDE that supports Java and other scheduling languages. It offers powerful features such as codification completion, debugging, and plugin support.
• IntelliJ IDEA: A various IDE with both a community (free) edition and a commercial edition. It is know for its modern code analysis and user-friendly interface.
• VSCode: A lightweight, open-source code editor developed by Microsoft. It supports legion programming languages through extensions and offers lineament such as IntelliSense (smart code completion), debugging, mix terminus, and version control integration.

2. Installing Selenium

2.1. Java

Step 1: & nbsp;Download Selenium Javabindings from the Selenium website.

Step 2: & nbsp;Add the downloaded JAR files to your project ’ s build path in your IDE.

Step 3: & nbsp;Set up a Maven or Gradle labor to manage dependency (if preferred).

Step 4: & nbsp;Add Selenium dependencies in & nbsp;pom.xml(for Maven) or & nbsp;build.gradle(for Gradle).
 

2.2. Python

Step 1: Install & nbsp;Pythonfrom the official website.

Step 2: Use & nbsp;pip(Python packet manager) to instal Selenium

2.3. C#

Step 1: & nbsp;Install Visual Studio IDE

Step 2: & nbsp;Create a new task and add Selenium WebDriver using NuGet software