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JUnit Tutorial


JUnit is a popular Java-based, open-source framework that is primarily used for unit testing Java projects. The framework offers support to Selenium for automation testing web-apps or websites. Selenium and JUnit can be used independently of each other, though testing with JUnit and Selenium combined helps to write test cases in a more structured way. Annotations in JUnit are used for identifying test methods. A variety of assertions, grouping tests into test suites, and ease offered in maintaining tests are the major reasons for JUnit’s popularity for cross browser testing.

Why Is JUnit So Popular Among Testers?

JUnit, without a doubt, is considered one of the top Java test frameworks. Below are the pointers behind it:

  • Open Source Framework.
  • It offers integrations with IDEs such as Eclipse, IntelliJ, etc., so you could test run your code quickly and easily.
  • Offers integration with CI/CD tools such as Jenkins, TeamCity, etc., to help you create a sturdy delivery pipeline.
  • Offers assertions to help you conveniently compare actual results with the expected results.
  • Offers annotations to help you identify the type of test method.
  • Provides a facility to create a test suite, which further includes multiple test cases and even other test suites.
  • Provides Test Runner to help you easily execute a Test Suite.
  • It makes the test code more readable, elegant, and increases the quality.
  • Provides JUnit Test Report Generation in HTML format.

JUnit Environment Setup

Want to set up JUnit environment for your first test? In this chapter, we will cover everything from how to download, install, and set up JUnit. We will also dive into how you can use JUnit with Eclipse and IntelliJ – popular IDEs for Java development.

How To Download, Install, And Setup JUnit?

JUnit is a Java-based automation framework, which means that the Java Development Kit (JDK) needs to be installed before performing further steps of the JUnit environment setup process. If you are a Java developer or a QA engineer who writes automation tests with Java, you should have JDK installed on your machine.

If you are just starting with JUnit testing or implementation in Java, you need to have JDK installed on the system.

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To learn more check out or blog on How To Setup JUnit Environment For Your First Test?.

JUnit With Selenium

Though JUnit is mainly used for unit testing Java projects, we can use it with Selenium Webdriver to automate Web applications testing. So you can even perform automation testing of a web application with JUnit. Selenium and JUnit can be used independently of each other, but testing with JUnit and Selenium combined helps to write test cases in a more structured way.

Do you know, using Selenium with JUnit is one of the most popular choices to test cloud services for web apps? Why? Due to its capabilities to run the script on multiple browsers and platforms with any language support one chooses. The reason makes the incorporation between JUnit and Selenium a lucrative choice for performing cross browser testing. With the use of JUnit, it provides a more structured way of writing your test that leads to better maintenance, quality, and effectiveness as compared to without using any frameworks like JUnit.

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To learn more check out our blog on Automated Testing With JUnit And Selenium For Browser Compatibility.

Run JUnit Test From Command Line

Though Java offers several IDEs using which you can write code and run tests, you would like to execute JUnit from the command line. Why? Because it can be useful for quickly checking whether the tests are running as per expectations (avoiding the need to open the IDE), in this chapter, we look at how to run the JUnit test from the command line.

Ready to run JUnit tests from the command line?

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Check out our blog on compiling and running JUnit Tests from the command line in different ways.

JUnit Parameterized Test

Are you tired of writing the same test scripts for different input values? Save time by learning how to perform a parameterized test in JUnit to retrieve data from a data source.

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To learn more read our blog on JUnit Parameterized Test For Selenium Automation With Examples.

Junit Asserts

Automation testing helps ease software testers' lives by letting them automate their repetitive tasks, and open-source test automation frameworks like Selenium have enabled users to automate web testing experience at scale. However, what good is automation testing if you cannot verify whether a test case has passed or failed?

This is where assertions come into the picture, so you can keep track of how many test failures or successes were encountered after executing your automation script for Selenium testing. In this chapter, we will show you how to assert in JUnit, different types of assert in JUnit by examples.

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To learn more check out our blog on Mastering Selenium Testing: JUnit Asserts With Examples.

JUnit Annotations

In this chapter, we would be looking at examples of JUnit annotations in Selenium, their order of execution, and some special JUnit annotations used for a specific purpose. We will also be looking into a collective code for executing each example of JUnit annotation in Selenium. At last, we will perform cross browser testing with Selenium Grid using JUnit annotations.

What Are JUnit Annotations?

Annotations are the meta-tags that provide additional information about the methods and classes defined in our code structure. In order to execute Selenium WebDriver testing with JUnit, it is necessary to add JUnit Annotations in our script. JUnit Annotations in Selenium help to identify the type of methods we have defined in our test code.

Note: JUnit Annotations would only be accessible in JUnit 4 plus versions, and it requires at least JDK(Java Development Kit) 1.5 version.

Learn More!!

To learn more check out our tutorial on JUnit Annotations In Selenium With Examples.

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