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

In JUnit 5, we can control the execution order of test classes and methods.
## Test method execution order
Test methods of a test class should be independent of each other, so these methods can be executed in any order. However, some test methods may have a specific execution order. We can use the `org.junit.jupiter.api.TestMethodOrder` annotation to control the execution order of test methods. The `@TestMethodOrder` uses an implementation of `org.junit.jupiter.api.MethodOrderer` to sort the test methods. The `MethodOrderer` provides four built-in implementations.

In JUnit 5, we can control the execution order of test classes and methods.
# Test method execution order
Test methods of a test class should be independent of each other, so these methods can be executed in any order. However, some test methods may have a specific execution order. We can use the `org.junit.jupiter.api.TestMethodOrder` annotation to control the execution order of test methods. The `@TestMethodOrder` uses an implementation of `org.junit.jupiter.api.MethodOrderer` to sort the test methods. The `MethodOrderer` provides four built-in implementations.

Learn how to control the order of test method execution 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 Method Order

Test method execution order