Difference between JUnit and TestNG


Software Testing is an important phase in the software development lifecycle because it involves locating and identifying bugs in the programme as well as ensuring that the software is error free. Testing is analogous to "quality control" and is what guarantees quality in the development of software. Unit testing, integration testing, functional testing, performance testing, acceptance testing, etc., are just some of the many types of testing that are performed at various points throughout the process.

Unit testing is carried out concurrently with the coding of a computer programme or application. In this type of testing, the smaller, more easily testable components of the programme or application, known as units, are singled out and put through their paces. Testing at the unit level is essential to the development of high-quality software.

Tests can be carried out either manually or automatically. Automated testing is the method that is utilised the most frequently in modern times because it enables tests to be run continuously at various phases of the software development lifecycle in the shortest amount of time possible.

The Java platform supports a wide variety of testing frameworks that can be used for unit testing. JUnit and TestNG are the Java frameworks for unit testing that are currently considered to be the most popular and widely used.

In terms of the functionality they provide, the two frameworks are extremely comparable; however, TestNG provides additional features that give it a distinct advantage over JUnit. Despite the fact that they both make use of functionalities that are widely employed, there are some subtle differences that put one of them ahead of the other.

What is JUnit?

The JUnit framework is a Java framework that is utilised frequently in the testing process. It helps the test run by simultaneously writing and testing along with it. In the beginning, the JUnit framework was derived from the SUnit framework, which is a framework that is utilised for unit testing. However, later on, it was upgraded with Java by utilising Selenium WebDriver. When it comes to performing testing in Java, JUnit has become the industry standard.

Some of the prominent features of the JUnit testing framework include −

  • JUnit does not support simultaneously running multiple parallel tests at the same time.

  • The JUnit framework received improvements in Java 8

  • When writing code, it is helpful to achieve test-driven programming using this.

  • JUnit now has support from a wide variety of languages.

What is TestNG?

TestNG is another Java framework that makes it easier to execute software tests in the Java programming language. It is a framework that executes the tests that are contained within the classes. After creating the corresponding classes for each test, it processes the results.

JUnit has some limitations that are circumvented by using the more advanced framework "TestNG". Since it uses the same Classes to run all of its tests and manages threads to run procedures, which makes the overall functioning of the checking tests faster, it is also thought of as a flexible tool for performing tests. TestNG makes the overall functioning of the checking tests faster.

Features of the TestNG framework include −

  • TestNG has the capability to organise test methods into Java groups.

  • It runs unit tests, feeding parameters into the methods of the tests as it does so.

  • Utilizing threads helps improve testing performance by cutting down on the amount of time spent in execution.

  • JUnit is able to overcome one of its limitations thanks to the fact that it permits the running of concurrent tests.

Difference between JUnit and TestNG

The following table highlights the major differences between Junit and TestNG −

Basis of comparisonJUnitTestNG
Developed byKent Beck, David Saff, and Erich Gamma are responsible for the development of JUnit. Erich Gamma, and Kris Vasudevan.Cédric Beust is the person responsible for the creation of the testing framework known as TestNG.
Parallel test RunsJUnit does not support to execute parallel tests.TestNG can Run parallel tests.
Dependency testsJUnit does not include any dependency tests.TestNG includes dependency tests.
Open-SourceJUnit is a framework that is open-source and may be used to write and trigger tests.TestNG is a Java-based framework that provides an improved way to run tests.
Supports AnnotationAdvanced annotation is not supported.It is capable of supporting more advanced annotation.
Ease of UseIn order for tests to be run, a necessary dependency on JUnit is required.When compared to JUnit, TestNG makes it simpler to write tests and configure them.
Grouping testsJUnit does not support the ability to organise tests into groups.The tests can be bundled together and executed simultaneously.


Both are among the most widely used frameworks for conducting unit testing on the Java platform. However, JUnit has been around for a longer period of time and it has a far larger user group within the Java community. Up until TestNG came along, it was the go-to Java framework for performing unit tests.

TestNG is another well-known Java testing framework that was developed in order to circumvent the functional constraints imposed by JUnit. TestNG offers a greater number of additional and more sophisticated features than JUnit does. These features include data-driven testing, parameterized testing, group testing, parallel testing, and so on.

In addition, the more extensive and specialised annotations that are available in TestNG give it an advantage over JUnit in terms of power. The primary distinction, however, is in the manner in which tests are planned and carried out.

Updated on 25-Jul-2022 10:18:33