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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

## Per-class test instance lifecycle
By default, JUnit creates a new instance of each test class before executing each test method. That’s why the `@BeforeAll` and `@AfterAll` annotations can only be added to static methods by default. This per-method test instance `Lifecycle` is appropriate for most cases because test methods in a test class should be independent and verify different aspects of the same target object.




# Per-class test instance lifecycle
By default, JUnit creates a new instance of each test class before executing each test method. That’s why the `@BeforeAll` and `@AfterAll` annotations can only be added to static methods by default. This per-method test instance `Lifecycle` is appropriate for most cases because test methods in a test class should be independent and verify different aspects of the same target object.




Let's understand how to use the test instance Lifecycle in JUnit 5.

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

Test Instance Lifecycle

Per-class test instance lifecycle