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Evan Wickham
Evan Wickham

Master Java Testing with JUnit 5: Download JUnit 5 Jar and Explore Its Features


How to Download and Use JUnit 5 in Java Projects




JUnit is one of the most popular unit-testing frameworks for Java applications. It helps developers to write and run automated tests that verify the functionality and quality of their code. JUnit 5 is the latest version of JUnit, which brings many new features and improvements over its predecessor, JUnit 4. In this article, we will learn how to download and use JUnit 5 in Java projects.


What is JUnit 5 and why is it useful for Java projects




JUnit 5 is the next generation of JUnit, which aims to create an up-to-date foundation for developer-side testing on the JVM. It supports new features in Java 8 and above, such as lambda expressions and streams, as well as enabling many different styles of testing. JUnit 5 is composed of several modules from three sub-projects: JUnit Platform, JUnit Jupiter, and JUnit Vintage.




download junit 5 jar



The JUnit Platform provides a common interface for launching testing frameworks on the JVM. It also defines the TestEngine API for developing new testing frameworks that run on the platform. The JUnit Jupiter module contains the new programming and extension models for writing tests in JUnit 5. It includes new annotations, assertions, and extensions that make testing easier and more expressive. The JUnit Vintage module provides compatibility support for running JUnit 3 and JUnit 4 tests on the JUnit Platform.


Some of the main features and benefits of JUnit 5 are:


  • It supports nested tests, parameterized tests, dynamic tests, repeated tests, test templates, and custom display names.



  • It allows dependency injection for constructors and methods, as well as custom test instance lifecycle management.



  • It provides a powerful extension mechanism that enables developers to customize test execution behavior.



  • It supports conditional test execution based on operating system, environment variables, system properties, or custom conditions.



  • It supports tagging and filtering of tests based on expressions or categories.



  • It supports parallel test execution with configurable strategies.



  • It integrates well with IDEs, build tools, and other testing frameworks.



How to download JUnit 5 jar files




To use JUnit 5 in your Java projects, you need to have Java installed on your PC. You also need to download the jar files that contain the modules of JUnit 5. Here are the steps to do that:


How to check if Java is already installed on your PC




To check if you have Java installed on your PC, you can use the command prompt or terminal. On Windows, press Windows+R to open the Run box, type cmd, and press Enter. On Linux or Mac OS X, open a terminal window. Then, type the following command and press Enter:


java -version


If you have Java installed on your PC, you will see your Java version displayed. For example:


java version "1.8.0_301" Java(TM) SE Runtime Environment (build 1.8.0_301-b09) Java HotSpot(TM) Client VM (build 25.301-b09, mixed mode)


If you don't have Java installed on your PC, you will see an error message saying that Java is not recognized as an internal or external command. In that case, you need to download and install Java on your PC. How to download and install Java on Windows




To download and install Java on Windows, you can follow these steps:


  • Go to the and click on the Download button for the latest version of Java SE.



  • On the next page, accept the license agreement and click on the Windows installer link for your system architecture (32-bit or 64-bit).



  • Save the file to your PC and run it as an administrator.



  • Follow the instructions on the screen to complete the installation process.



  • Restart your PC to apply the changes.



After installing Java, you can verify that it is working by opening a command prompt and typing java -version again. You should see your Java version displayed.


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How to use wget to download JAR files on Linux




To use wget to download JAR files on Linux, you can follow these steps:


  • Open a terminal window and navigate to the directory where you want to save the JAR files.



Type the following command and press Enter:


wget


  • This will download the JUnit Platform Console Standalone JAR file, which contains all the modules of JUnit 5 in a single file.



If you want to download the individual JAR files for each module of JUnit 5, you can use the following commands:


wget wget wget wget wget wget wget wget wget wget wget


How to use JUnit 5 in Java projects




To use JUnit 5 in your Java projects, you need to add the JUnit 5 dependencies in your build tool, such as Maven or Gradle, or in your IDE, such as Eclipse or IntelliJ IDEA. You also need to write and run JUnit 5 tests using the new annotations, assertions, and extensions provided by JUnit 5.


How to add JUnit 5 dependencies in Maven or Gradle




If you are using Maven or Gradle as your build tool, you can add the JUnit 5 dependencies in your pom.xml or build.gradle file respectively.


For Maven, you can use the following dependency:


org.junit.jupiter


junit-jupiter


5.8.1


test


For Gradle, you can use the following dependency:


testImplementation 'org.junit.jupiter:junit-jupiter:5.8.1'


This will include all the modules of JUnit 5 in your project. Alternatively, you can add the individual modules as per your needs.


How to run JUnit 5 tests in IDEs or build tools




If you are using an IDE, such as Eclipse or IntelliJ IDEA, you can run JUnit 5 tests by right-clicking on the test class or method and selecting Run As -> JUnit Test or Run -> Run With -> JUnit 5 respectively. You can also use the keyboard shortcuts Ctrl+F11 or Shift+F10 respectively.


If you are using a build tool, such as Maven or Gradle, you can run JUnit 5 tests by using the following commands:


mvn test


gradle test


This will execute all the tests in your project. You can also specify the test class or method name as a parameter to run a specific test.


How to write JUnit 5 tests using annotations, assertions, and extensions




To write JUnit 5 tests, you need to use the new annotations, assertions, and extensions provided by JUnit 5. Here are some examples of how to use them:


To create a test class, you need to annotate it with @TestInstance and @TestMethodOrder annotations. The @TestInstance annotation specifies the lifecycle of the test class instance, which can be either per-class or per-method. The @TestMethodOrder annotation specifies the order of execution of the test methods, which can be based on their names, annotations, or random.


@TestInstance(TestInstance.Lifecycle.PER_CLASS) @TestMethodOrder(MethodOrderer.OrderAnnotation.class) public class CalculatorTest // ...


To create a test method, you need to annotate it with @Test annotation. You can also use @DisplayName, @Tag, @Order, and @Disabled annotations to provide a custom name, a tag, an order, and a condition for disabling the test method respectively.


@Test @DisplayName("Addition Test") @Tag("Math") @Order(1) public void testAdd() // ...


To create a nested test class, you need to annotate it with @Nested annotation. This allows you to group related tests together and share common setup and teardown methods.


@Nested @DisplayName("Subtraction Tests") class SubtractionTest // ...


To creat


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