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  • Selenium Introduction ,Benefits and components of Selenium

    This article will present you with a complete idea about selenium Introduction , Benefits of selenium and Different components of Selenium.

    Selenium Introduction ,Benefits and Components of Selenium

    Selenium Introduction

    Selenium was created by Jason Huggins in 2004, he was an engineer at Thought Works.

      • Selenium is a free and open-source test automation tools used for automating web-based applications.
      • Selenium supports automation across different browsers, platforms, and programming languages.
      • Selenium is basically a library which you can use in your program to test a web application.
      • functional tests can be automated easily using selenium and we can integrate them with build automation tools, Ant , Maven, Jenkins or other few third party tools.

    Benefits of Selenium 

      • Selenium is a free and open source tool.
      • Selenium supports multiple languages like Java ,Ruby, Perl, Python, C#, JavaScript etc.
      • Selenium supports multiple operating systems like Windows, Mac, UNIX, and Linux.
      • Selenium supports multiple browsers like Chrome, Firefox ,Internet Explorer, Safari etc.
      • Selenium is quite similar to HP Quick Test Pro (QTP now UFT) only that Selenium focuses on automating web-based applications.

    Four Components of Selenium

    Selenium is not just a single automation tool but it is  a suite of tools, each catering to different testing needs of an organization. It has four components.

      1. Selenium Integrated Development Environment (IDE)
      2. Selenium Remote Control (RC)
      3. Selenium WebDriver
      4. Selenium Grid

    1) Selenium Integrated Development Environment (Selenium IDE) :

      • Selenium IDE is the browser[Mozilla Firefox, chrome] extension and it allows us to record and play the test case for websites.
      • Selenium IDE is a starting of learning and the best use to record user actions quickly and save time .
      • It does not allow to use any programming language in creating test scripts

    2) Selenium Remote Control (RC)

      • Selenium RC is written in Java and It accepts commands from browsers via Http. 
      • The primary objective of Selenium RC is to convert your Selenese to a programming language.
      • It supports all browsers like Firefox, IE, Chrome, Safari, Opera etc.
      • It injects JavaScript code in the browser for automation and requires an additional server for running the automation scripts.
      • Selenium RC cannot support the headless Html Unit browser ,it needs a real and visible browser to operate on.

    There are 2 components of Selenium RC

    a) Selenium RC Server

    It acts as a middleman between your selenium commands and browser. , so it needs to be launched before you start testing.

    b) Client libraries

    It provides interface between programming languages and Selenium RC server.

    3) Selenium WebDriver

      • Selenium web driver is a web automation framework that allows you to execute test cases against multiple browsers.
      • Selenium WebDriver supports all browsers like Firefox, IE, Chrome, Safari, Opera etc.
      • Does not require to start server before executing the test scripts (unlike Selenium RC)
      • Selenium WebDriver is faster than Selenium RC as it speaks directly to the browser’s own engine to control it.
      • WebDriver can support headless Html Unit Browsers as well.

    4) Selenium Grid

      • Selenium grid helps in the distributed running of Selenium tests in parallel across different browsers, operating systems, and machines .
      • Selenium Grid uses a hub-node concept where you only run the test on a single machine called a hub but the execution will be done by different machines called nodes

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