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
Dependency injection makes service objects easier to use when writing tests.

**Contexts and Dependency Injection (CDI)** is a standard dependency injection framework with Java Enterprise Edition 6 and higher. It enables us to control the lifecycle of stateful components using domain-specific lifecycle contexts and type-safely inject components (services) into client objects. 

Write an extension that supports dependency injection using CDI.
# Coding challenge
Take some time to determine the logic behind this problem before jumping to the implementation. The function skeleton has been created. You only need to write code in its body.
## Task 1
Create a `UserService` class and add `find()`, `createOrUpdate()`, and `delete()` methods in it.
## Task 2
Write functions in the test class `UserServiceTest` to test methods of the `UserService` class using the `assertTrue` and `assertFalse` assertions.

If you get stuck, feel free to look at the solution review in the next lesson.

Good luck!

Write an extension that supports dependency injection using CDI.

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: Dependency Injection Using CDI

Problem statement