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JUnit vs Selenium: What are the differences?

# Introduction
In this markdown, we will discuss the key differences between JUnit and Selenium.

1. **Programming Language**: JUnit is specifically designed for Java programming language testing, whereas Selenium supports multiple languages such as Java, Python, C#, etc.
2. **Purpose**: JUnit is primarily used for unit testing individual classes or units of code, while Selenium is used for functional and regression testing of web applications.
3. **Testing Scope**: JUnit focuses on testing code at a unit level, while Selenium allows for end-to-end testing of web applications including user interface interactions.
4. **Integration**: JUnit is integrated with popular IDEs like Eclipse or IntelliJ for writing and executing tests, whereas Selenium requires additional tools like WebDriver to effectively automate browser interactions.
5. **Execution Environment**: JUnit tests are executed within the JVM (Java Virtual Machine), while Selenium tests run in browsers like Chrome, Firefox, etc.
6. **Dependencies**: JUnit tests can be run independently of any external dependencies, while Selenium tests require a set up of web drivers and browser configurations.

In Summary, JUnit is focused on unit testing in Java, while Selenium is used for web application testing across multiple languages and browsers.
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we are having one web application developed in Reacts.js. in the application, we have only 4 to 5 pages that we need to test. I am having experience in selenium with java. Please suggets which tool I should use. and why ............................ ............................ .............................

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Prashanth Marappa
Senior Software Engineer at Mphasis · | 1 upvotes · 219.4K views
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with the help of selenium we can automate react js for functional testing

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Pros of JUnit
Pros of Selenium
    Be the first to leave a pro
    • 175
      Automates browsers
    • 154
      Testing
    • 101
      Essential tool for running test automation
    • 24
      Record-Playback
    • 24
      Remote Control
    • 8
      Data crawling
    • 7
      Supports end to end testing
    • 6
      Easy set up
    • 6
      Functional testing
    • 4
      The Most flexible monitoring system
    • 3
      End to End Testing
    • 3
      Easy to integrate with build tools
    • 2
      Comparing the performance selenium is faster than jasm
    • 2
      Record and playback
    • 2
      Compatible with Python
    • 2
      Easy to scale
    • 2
      Integration Tests
    • 0
      Integrated into Selenium-Jupiter framework

    Sign up to add or upvote prosMake informed product decisions

    Cons of JUnit
    Cons of Selenium
      Be the first to leave a con
      • 8
        Flaky tests
      • 4
        Slow as needs to make browser (even with no gui)
      • 2
        Update browser drivers

      Sign up to add or upvote consMake informed product decisions

      What is JUnit?

      JUnit is a simple framework to write repeatable tests. It is an instance of the xUnit architecture for unit testing frameworks.

      What is Selenium?

      Selenium automates browsers. That's it! What you do with that power is entirely up to you. Primarily, it is for automating web applications for testing purposes, but is certainly not limited to just that. Boring web-based administration tasks can (and should!) also be automated as well.

      Need advice about which tool to choose?Ask the StackShare community!

      What companies use JUnit?
      What companies use Selenium?
      See which teams inside your own company are using JUnit or Selenium.
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      What tools integrate with JUnit?
      What tools integrate with Selenium?

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      Blog Posts

      What are some alternatives to JUnit and Selenium?
      NUnit
      An evolving, open source framework designed for writing and running tests in Microsoft .NET programming languages.It is an aspect of test-driven development , which is part of a larger software design paradigm known as Extreme Programming
      TestNG
      It is a testing framework designed to simplify a broad range of testing needs, it covers all categories of tests: unit, functional, end-to-end, integration, etc.Run your tests in arbitrarily big thread pools with various policies available (all methods in their own thread, one thread per test class, etc.
      Mockito
      It is a mocking framework that tastes really good. It lets you write beautiful tests with a clean & simple API. It doesn’t give you hangover because the tests are very readable and they produce clean verification errors.
      Arquillian
      It is an integration and functional testing platform that can be used for Java middleware testing. With the main goal of making integration (and functional) tests as simple to write as unit tests, it brings the tests to the runtime environment, freeing developers from managing the runtime from within the test.
      xUnit
      It is a free, open source, community-focused unit testing tool for the .NET Framework. It is the latest technology for unit testing C#, F#, VB.NET and other .NET languages. It works with ReSharper, CodeRush, TestDriven.NET and Xamarin.
      See all alternatives