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Table of contents
Installing Java
Installing JUnit
Setting Up Environment Variables for JUnit
Key Takeaways
Last Updated: Mar 27, 2024

JUnit Environment Setup and Framework

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Ashwin Goyal
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JUnit is a Testing Framework used by developers to perform unit testing in Java.JUnit modifies programming speed and increases the quality of code. Furthermore, JUnit increases the developer's confidence to build error-free code.
JUnit is based on the idea of "Testing first, then coding."Meaning JUNIT focuses on setting up the test data for a block of code that can first be tested and then implemented. This approach is like a cycle of minor Testing and minor coding, which increases a developer's productivity and code stability. This approach dramatically reduces the debugging time required by a programmer.

Installing Java

We need to install JDK Java Development Kit for starters to run JUnit. The JDK allows to code and runs Java programs. In this blog, we will be downloading the latest version of JDK for Windows.
Latest Version of JDK

Download and Run the JDK Installer.

Click Next

Keep the default installation directory and proceed. This can take some time to install JDK in your system. Finally, close the setup wizard and head over to the installation directory.

Copy the entire directory path and head to the Environment Variables options located under the advanced system properties.

Click on the Environment Variables button.

Click on New and set the following name and value.
Note: append \bin to the value copied from the JDK directory.
With this, we have finally installed and set up JDK.

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Installing JUnit

With JDK installed, it is time to get started with JUnit's installation.
Head here.

Click on the Download and Install button.

This will redirect you to a Github Repository. Click on junit.jar to download JUnit.

Download the jar file
Next, we download the hamcrest file from here 
Finally, all that's left is to create a JUnit folder located under the C: Drive and paste both the downloaded files.

With this, we have successfully downloaded all the JUnit files.

Setting Up Environment Variables for JUnit

We again head over to the Environment Variables Menu to set up JUnit.
Then under the System Variables menu, we create a new Variable.

After entering the above parameters, we hit Enter.
Now, we need to create another variable with the name of CLASSPATH inside the System Variables.
Note: If the variable CLASSPATH already exists, edit the variable.

Press Ok, and we are finished with the Environment Set up of JUNIT.

Check out JUnit Interview Questions here.


  1. What is JDK?
    The JDK or Java Development Kit is a cross-platform software development environment that provides a collection of tools and libraries necessary for creating Java-based applications.JDK is a core package used in Java, along with the JVM (Java Virtual Machine) and the JRE (Java Runtime Environment). 
  2. What is JUnit?
    JUnit is a framework for Java programming language to perform unit testing. It plays an essential role in test-driven development and is a family of unit testing frameworks known as xUnit.
  3. What does Testing first then coding mean?
    JUnit focuses on setting up the test data for a block of code that can first be tested and then implemented. This approach is like a cycle of minor Testing and minor coding, which increases a developer's productivity and code stability. Hence called "Testing first then coding."
  4. Why is JUnit needed?
    JUnit makes the code readable, stable, and error-free. Furthermore, it boosts developers' confidence and is super easy to use.
  5. What are JUnit Annotations?
    JUnit Annotations are the syntactic meta-data appended to the Java source code for a fine structure and readability. 

Key Takeaways

In this article, we learned about the installation process of JUnit and how to set up its environment. We also learned how JDK is installed to use JUnit successfully. However, this isn't enough, as there is always much more to explore and learn about this vast field of Web Development. To know more about JUnit and its intricacies, check out the articles on JUnit or enroll in our highly curated Web Development course.        

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