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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

## Execution order of test classes
We can also control the execution order of test classes. This is done by using the `org.junit.jupiter.api.TestClassOrder` annotation and `org.junit.jupiter.api.ClassOrderer` interface. The `ClassOrderer` also has four built-in implementations.

# Execution order of test classes
We can also control the execution order of test classes. This is done by using the `org.junit.jupiter.api.TestClassOrder` annotation and `org.junit.jupiter.api.ClassOrderer` interface. The `ClassOrderer` also has four built-in implementations.

Learn how to control the order in which test classes are executed 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 Class Order

Execution order of test classes