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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

Test methods are grouped in test classes. Test methods in a test class are typically related to the same test target. JUnit 5 supports nested tests that can easily express complicated test relationships. Nested tests are declared using the `org.junit.jupiter.api.Nested` annotation on non-static inner classes of the current test class.
## User class
Let’s look at a concrete example to learn how to write nested tests. The class we’ll test is a service class that’s responsible for managing users. The code below shows the class `User`. This class has two properties, `name` and `email`.

Test methods are grouped in test classes. Test methods in a test class are typically related to the same test target. JUnit 5 supports nested tests that can easily express complicated test relationships. Nested tests are declared using the `org.junit.jupiter.api.Nested` annotation on non-static inner classes of the current test class.
# User class
Let’s look at a concrete example to learn how to write nested tests. The class we’ll test is a service class that’s responsible for managing users. The code below shows the class `User`. This class has two properties, `name` and `email`.

Learn how to use the @Nested annotation to configure the test hierarchy.

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

@Nested Tests

User class