Gain insights into JUnit 5, explore its advantages over JUnit 4, and delve into its features like assertions, parameterized tests, dependency injection, and test execution order. Discover hands-on projects to cement your skills.

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JUnit 5 is a standard framework for unit testing in Java. Released in 2017, JUnit 5 is a major improvement over JUnit 4 and supports a lot of new methods. Many projects have migrated from JUnit 4 to JUnit 5. JUnit 5 is also the default test framework for new projects. JUnit 5 is composed of three sub-projects: JUnit Platform, JUnit Jupiter, and JUnit Vintage. Details of these sub-projects are discussed in the course.

This course first discusses the advantages of JUnit 5 over the previous versions and then jumps directly into tests. The course includes discussion on assertions, assumptions, tagging and filtering, nested tests, dependency injection, repeated tests, parameterized tests, dynamic tests, test instance lifecycle, extension model, JUnit 4 migration, JUnit platform, and test execution order. 

By the end of this course, you’ll be deeply familiar with unit testing in JUnit 5. There’s also a little project for you at the end to put your newly acquired skills to the test.

All About JUnit5

## Problem Statement
When testing the REST API of a microservice, it’s common practice to treat the service as a black box. Testing is performed by sending requests to the REST API and verifying the response. These requests and responses are contracts of this API. To enable non-technical users to write API tests, we can use a JSON file to describe the request and desired response.

The JSON code below shows an example of a REST API test. The request sends a POST call to create a new user. The status code, headers, and body of the response are verified.



# Problem Statement
When testing the REST API of a microservice, it’s common practice to treat the service as a black box. Testing is performed by sending requests to the REST API and verifying the response. These requests and responses are contracts of this API. To enable non-technical users to write API tests, we can use a JSON file to describe the request and desired response.

The JSON code below shows an example of a REST API test. The request sends a POST call to create a new user. The status code, headers, and body of the response are verified.



Write an extension that can run API tests.

Getting Started

Writing Basic Tests

Annotations, Tagging, and Filtering

Nested tests in JUnit 5

Dependency Injections

Parameterized and Dynamic Tests

Test Instance Lifecycle in JUnit 5

Extension Model

JUnit Platform

Test Execution Order

Conclusion

Library Management System

Exercise: API Tests

Problem Statement