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Java Tutorial for Beginners: A Step-by-Step Guide

Overview

What is Java: A Beginners Guide To Java

Lesson - 1

10 Reasons That Explain Why You Need to Learn Java

Lesson - 2

Java EE Tutorial: All You Need To Know About Java EE

Lesson - 3

How to Implement the Revolutionary OOPs Concepts in Java

Lesson - 4

What Is JDK? Why Do We Need It?

Lesson - 5

One-Stop Solution for Java Installation in Windows

Lesson - 6

Java Programming: The Complete Reference You Need

Lesson - 7

All You Need to Know to Implement JUnit Testing in Java

Lesson - 8

Arrays In Java: Declare, Define, and Access Array

Lesson - 9

10 Best Java Frameworks You Should Know in 2021

Lesson - 10

Top 25 Pattern Programs in Java For Printing Numbers

Lesson - 11

What Are Java Classes and Objects and How Do You Implement Them?

Lesson - 12

What is a Java Lambda Expression and How to Implement It?

Lesson - 13

The Differences Between C++ and Java That You Need To Know

Lesson - 14

What is Exception Handling in Java?

Lesson - 15

How to Get Started With Eclipse IDE?

Lesson - 16

What is Java API and The Need for Java APIs?

Lesson - 17

What Are Java Strings And How to Implement Them?

Lesson - 18

Java vs JavaScript: Know The 8 Major Differences

Lesson - 19

What is Encapsulation in Java and How to Implement It?

Lesson - 20

What is Java Interface and Why it's Needed?

Lesson - 21

Top 10 Brilliant Java Project Ideas You Need to Know

Lesson - 22

Top 60 Java Interview Questions and Answers in 2021

Lesson - 23

Java vs. Python: Which is the Best Programming Language?

Lesson - 24

What is an Abstract Class in Java and How to Implement It?

Lesson - 25

Introduction To Java Servlets and Its Life-Cycle

Lesson - 26

What is Polymorphism in Java and How to Implement It?

Lesson - 27

What Is Junit? a Look Into the Best Java Testing Framework

Lesson - 28

What Is Java JDBC? The Complete Reference

Lesson - 29

What Are Java Collections and How to Implement Them?

Lesson - 30

What is Inheritance in Java and How to Implement It

Lesson - 31
What Is Junit? a Look Into the Best Java Testing Framework

JUnit has set a benchmark when it comes to testing Java applications. Since JUnit is compatible with almost all IDE's, organizations worldwide have adopted it to perform unit testing in the Java Programming Language. In this article titled “What is JUnit”, you will explore all the relevant topics needed to get a firm understanding of JUnit.

The topics covered in this article are as follows:

  • What is JUnit?
  • What is Unit Testing?
  • What is the need for JUnit?
  • Features of JUnit

What is JUnit?

JUnit is a unit testing open-source framework for the Java programming language. Java Developers use this framework to write and execute automated tests. In Java, there are test cases that have to be re-executed every time a new code is added. This is done to make sure that nothing in the code is broken. 

Download_JUnit

JUnit has several graphs that represent the progress of a test. When the test runs smoothly, the graph displays a green color, and it turns red if the test fails. JUnit Testing enables developers to develop highly reliable and bug-free code.

bug_Free_JUnit

JUnit plays a huge role when it comes to regression testing. Regression Testing is a type of software testing that checks if the recent changes made to the code do not adversely affect the previously written code.

To have a better answer to the question ‘What is JUnit’, let's have a look at what Unit Testing is.

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What is Unit Testing?

Unit testing, as the name suggests, refers to the testing of small segments of code. Here, a unit indicates the smallest bit of code that can be fetched out of the system. This small bit can be a line of the code, a method, or a class. The smaller the chunk of code, the better it is, as smaller chunks will tend to run faster. And this provides a better insight into the code and its performance. 

JUnit_Unit_Testing

When the chunk is small, it is easy to identify the defects from the dormant phase itself. The developers now spend more time reading the code than writing it. A successful code boosts the confidence of the developer and makes them work better.

What is the need for JUnit Testing?

The top reasons to take up JUnit Testing are:

  • To find bugs early in the development phase, which increases the code’s reliability
  • The framework enables the developer to invest more time in reading the code than writing it

JUnitFramework

  • This makes the code more readable, reliable, and bug-free
  • It boosts the confidence of the developer and motivates them immensely

Features of JUnit

There are several features of JUnit that make it so popular. Some of them are as follows:

  • Open Source Network: 

JUnit is an open-source network that enables developers to write codes fast and with better quality.

  • Provides Annotations: 

It provides several annotations to identify test methods.

  • Provides Assertions:

There are assertions to test expected results.

  • Provides Test Runners:

 JUnit has test runners to run tests.

JUnit_Test_Runners

  • Improves Code Quality: 

JUnit is the most popular testing framework for efficient testing. It allows faster code writing, which results in an increase in the code’s quality. 

  • Automated Test Running: 

The test results do not require manual checking. All the tests run automatically on JUnit, the results obtained again automatically checked, and it provides feedback.

JUnit_Automated_Results

  • Easily interpretable results: 

The test results are represented interactively by showing test progress in a bar, thus making them easily interpretable.

Moving on, let's have a look at JUnit Annotations.

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JUnit Annotations

  • JUnit Annotations refer to the syntactic meta-data added to the Java source code for better structure and readability. Here, syntactic meta-data refers to the type of data representing the structure of a file with references to bytes, data types, and data structures.
  • The main point of difference between JUnit4 and JUnit3 is the introduction of  Junit Annotations. 

JUnitAnnotations1

JUnitAnnotations2

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Conclusion

By now, you would have learned all the basic concepts needed to start with JUnit. This article also proves why JUnit is so important when it comes to automated testing. You also saw the distinct features of JUnit and what makes one version of JUnit different from the other. Finally, you understood what JUnit Annotations are, and also saw a few of them.

To learn more about JUnit, you can check this JUnit Tutorial. This includes some hands-on demo that shows you how testing occurs in Java and Eclipse.

If you have any questions for us, do let us know in the comments section of the “What is JUnit” article. Our experts will answer them for you as soon as possible.

About the Author

Ishan GabaIshan Gaba

Ishan Gaba is a Research Analyst at Simplilearn. He is proficient in Java Programming, Data Structures, and Project Management. Graduated in Information Technology, Ishan is also passionate about writing and traveling.

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